WO2011001942A1 - 感光性接着剤、並びにそれを用いたフィルム状接着剤、接着シート、接着剤パターン、接着剤層付半導体ウェハ及び半導体装置 - Google Patents
感光性接着剤、並びにそれを用いたフィルム状接着剤、接着シート、接着剤パターン、接着剤層付半導体ウェハ及び半導体装置 Download PDFInfo
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- WO2011001942A1 WO2011001942A1 PCT/JP2010/060988 JP2010060988W WO2011001942A1 WO 2011001942 A1 WO2011001942 A1 WO 2011001942A1 JP 2010060988 W JP2010060988 W JP 2010060988W WO 2011001942 A1 WO2011001942 A1 WO 2011001942A1
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- adhesive
- group
- film
- semiconductor
- photosensitive
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- NJMOHBDCGXJLNJ-UHFFFAOYSA-N trimellitic anhydride chloride Chemical compound ClC(=O)C1=CC=C2C(=O)OC(=O)C2=C1 NJMOHBDCGXJLNJ-UHFFFAOYSA-N 0.000 description 1
- 125000003258 trimethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1039—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors comprising halogen-containing substituents
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- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J179/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09J161/00 - C09J177/00
- C09J179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09J179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/00—Adhesives in the form of films or foils
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- C—CHEMISTRY; METALLURGY
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
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- G—PHYSICS
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/40—Treatment after imagewise removal, e.g. baking
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L21/6836—Wafer tapes, e.g. grinding or dicing support tapes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
- C09J2301/204—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive coating being discontinuous
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2463/00—Presence of epoxy resin
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2479/00—Presence of polyamine or polyimide
- C09J2479/08—Presence of polyamine or polyimide polyimide
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- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
- H01L2224/0555—Shape
- H01L2224/05552—Shape in top view
- H01L2224/05554—Shape in top view being square
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32135—Disposition the layer connector connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
- H01L2224/32145—Disposition the layer connector connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being stacked
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
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- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
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- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
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- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
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- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- the present invention relates to a photosensitive adhesive, and a film adhesive, an adhesive sheet, an adhesive pattern, a semiconductor wafer with an adhesive layer, and a semiconductor device using the photosensitive adhesive.
- the adhesive used for bonding the semiconductor element and the semiconductor element mounting support member has a sticking property when it is formed into a film (hereinafter also simply referred to as “sticking property”), Points such as adhesiveness at high temperatures, thermocompression bonding, heat resistance and reflow resistance (hereinafter also referred to as “high temperature adhesiveness”, “thermocompression bonding”, and “reflow resistance”, respectively) when cured. It is desirable to be excellent.
- the adhesive has a pattern forming property (hereinafter also simply referred to as “pattern forming property”) such as thinning with an alkali developer or dissolution developing property.
- pattern forming property such as thinning with an alkali developer or dissolution developing property.
- the photosensitive adhesive composition has a function of “photosensitivity” in which a portion irradiated with light is chemically changed to be insolubilized or solubilized in an aqueous solution or an organic solvent. Therefore, such a photosensitive adhesive composition is used.
- a high-definition adhesive pattern can be obtained by using the adhesive and exposing and developing through a photomask.
- Patent Documents 1 to 3 those based on a photoresist or a polyimide resin precursor (polyamic acid) have been known (Patent Documents 1 to 3), and based on a low Tg polyimide resin. Has also been proposed (Patent Document 4).
- the photoresist is not sufficient in terms of heat resistance.
- the photosensitive adhesive composition based on the polyimide resin precursor is sufficient in terms of heat resistance, it requires a high temperature of 300 ° C. or higher during thermal ring-closing imidization, so that thermal damage to surrounding materials is caused. It was not sufficient in that it was large, the amount of volatile components was large, and thermal stress was likely to occur.
- these conventional photosensitive adhesive compositions have been desired to be improved in that it is difficult to achieve both the adhesive property and the pattern forming property, and the high temperature adhesive property and the thermocompression bonding property are not sufficient.
- the above-mentioned photosensitive adhesive composition based on the low Tg polyimide resin is sufficient in terms of sticking property, it is not sufficient in terms of pattern forming property, thermocompression bonding property, and high-temperature adhesiveness.
- thermocompression bonding property In order to improve the pattern forming property, thermocompression bonding property, and high-temperature adhesion property of the photosensitive adhesive composition, attempts were also made to adjust the amount of the radiation polymerizable compound and the thermosetting resin.
- tackiness stickinginess or tackiness
- thermocompression bonding tends to be insufficient
- stress tends to increase.
- the amount of the radiation polymerizable compound was reduced, there was a tendency that the pattern forming property and the high temperature adhesiveness were not sufficient. Further, when the amount of the thermosetting resin is increased, the pattern formability tends to be insufficient.
- the unexposed portion remains in a film state and is peeled off from the adherend portion to form a pattern (peeling development). In this development state, the film-like unexposed part remains in the developer for a long time and reattaches to the pattern forming part, resulting in a decrease in the yield of the semiconductor device.
- the present invention is a photosensitive adhesive composition that is sufficiently excellent in all points of sticking property, pattern forming property, thermocompression bonding property, and high-temperature adhesiveness, and a film-like adhesive, an adhesive sheet, and an adhesive using the same.
- An object is to provide an agent pattern, a semiconductor wafer with an adhesive layer, and a semiconductor device.
- the present invention includes (A) an imide group-containing resin having a fluoroalkyl group (hereinafter also referred to as “(A) component”), (B) a radiation polymerizable compound (hereinafter also referred to as “(B) component”). ), (C) a photoinitiator (hereinafter also referred to as “(C) component”), and (D) a thermosetting component (hereinafter also referred to as “(D) component”).
- A an imide group-containing resin having a fluoroalkyl group
- (C) a photoinitiator hereinafter also referred to as “(C) component”
- (D) a thermosetting component hereinafter also referred to as “(D) component”.
- the photosensitive adhesive of the present invention includes a component (A) (an imide group-containing resin having a fluoroalkyl group), thereby increasing the cohesion between imide group-containing molecules when the imide group content is increased to a high Tg. Since the increase is suppressed, the pattern formability (dissolvable development and thinning), thermocompression bonding, and high-temperature adhesiveness are excellent.
- A an imide group-containing resin having a fluoroalkyl group
- the fluoroalkyl group means a compound having a C—F bond.
- “sticking property” means sticking property when the photosensitive adhesive composition is formed into a film shape to form a film adhesive, and “high temperature adhesiveness”. Means the adhesiveness under heating when the photosensitive adhesive composition is made into a cured product, and the “pattern forming property” is composed of the film adhesive formed on the adherend. It means the accuracy of the adhesive pattern obtained when the adhesive layer is exposed through a photomask and developed with an alkaline developer. “Thermocompression bonding” means that the adhesive pattern is heated to a support member, etc. It means the degree of adhesion when crimping (thermocompression bonding).
- the Tg of the component (A) is preferably 180 ° C. or lower from the viewpoints of stickability and thermocompression bonding.
- the imide group-containing resin having a fluoroalkyl group further has an alkali-soluble group from the viewpoint of pattern formation.
- the component (A) contains a diamine having a phenolic hydroxyl group in an amount of 5 mol% or more of the total diamine. And an imide group-containing resin obtained by reacting tetracarboxylic dianhydride.
- a phenolic hydroxyl group-containing diamine as the diamine is considered to be excellent in the above characteristics for the following reasons.
- a photosensitive adhesive composition is applied and processed into a film adhesive by heating and drying
- a carboxyl group-containing resin is used as the imide group-containing resin
- it reacts with the epoxy resin that is blended during heating and drying.
- the acid value of the thermoplastic resin is greatly reduced.
- the side chain of the imide group-containing resin is a phenolic hydroxyl group
- the reaction with the epoxy resin is less likely to proceed than when the carboxyl group is used.
- pattern formability, thermocompression bonding, and high temperature adhesion are improved.
- the diamine having the phenolic hydroxyl group is represented by the following general formula (6) from the viewpoints of pattern formability, thermocompression bonding, and reflow resistance. It is preferable that the diphenoldiamine which has this is included.
- Reflow resistance means reflow resistance after the adhesive pattern is thermocompression-bonded to a support member, cured, and absorbed.
- the (D) thermosetting component contains (D1) an epoxy resin from the viewpoint of storage stability and high-temperature adhesiveness.
- the (A) imide group-containing resin is an alkali-soluble resin from the viewpoint of pattern formation.
- thermosetting component is (D2) a compound having an ethylenically unsaturated group and an epoxy group. It is preferable to further contain.
- the high temperature adhesiveness and reflow resistance characteristics are improved by blending the above (D2), for example, for the following reasons.
- a (meth) acrylate having an epoxy group (component (D2)) is introduced into the network of radiation polymerizable compounds after light irradiation, the apparent crosslink density is reduced and the thermocompression bonding property is improved.
- this epoxy group reacts with a thermosetting group or a curing agent, particularly a phenolic hydroxyl group in the polymer side chain, the entanglement of the molecular chains increases, and the radiation polymerizable compound and the thermosetting resin are simply blended.
- a network stronger than the system in which each crosslinking reaction proceeds independently is formed. As a result, it becomes sufficiently excellent in terms of high-temperature adhesiveness and moisture resistance.
- the (D) thermosetting component further contains (D3) a phenol compound from the viewpoint of high temperature adhesiveness and pattern formability.
- the photosensitive adhesive composition of the present invention preferably further contains (E) a peroxide from the viewpoints of high-temperature adhesion, reflow resistance and hermetic sealing.
- the photosensitive adhesive composition of the present invention preferably further contains (F) a filler from the viewpoint of film formation.
- the present invention relates to a film adhesive obtained by forming the photosensitive adhesive composition into a film.
- the film-like adhesive of the present invention is sufficiently excellent in all points of sticking property, high-temperature adhesiveness, pattern forming property, thermocompression bonding property, heat resistance and moisture resistance by using the photosensitive adhesive composition. It will be a thing.
- the film adhesive has excellent sticking properties (low temperature sticking property) even at low temperatures.
- the present invention also relates to an adhesive sheet comprising a base material and an adhesive layer made of the film-like adhesive formed on the base material.
- this invention exposes the adhesive bond layer which consists of the said film adhesive laminated
- the adhesive pattern of the present invention is obtained by directly drawing and exposing an adhesive layer made of the above film adhesive laminated on an adherend using a direct drawing exposure technique, and then exposing the adhesive layer. May be formed by developing with an aqueous alkali solution.
- the adhesive pattern of the present invention becomes a high-definition pattern excellent in thermocompression bonding. In particular, the adhesive pattern has excellent thermocompression bonding (low temperature thermocompression bonding) even at low temperatures.
- the present invention also relates to a semiconductor wafer with an adhesive layer comprising a semiconductor wafer and an adhesive layer made of the above film adhesive laminated on the semiconductor wafer.
- the present invention relates to a semiconductor device having a structure in which semiconductor elements and / or a semiconductor element and a semiconductor element mounting support member are bonded to each other using the photosensitive adhesive composition.
- the semiconductor device of the present invention can sufficiently cope with the simplification of the manufacturing process and has excellent reliability.
- the semiconductor element mounting support member is preferably a transparent substrate.
- a photosensitive adhesive composition that is sufficiently excellent in all points of sticking property (low temperature sticking property), high temperature adhesive property, pattern forming property, and thermocompression bonding property (low temperature thermocompression bonding property). Can do. Furthermore, according to the present invention, it is possible to provide a fine pattern having thermocompression bonding property and high-temperature adhesiveness, and to provide a material excellent in reflow resistance. Furthermore, according to the present invention, since the pattern formability can be maintained even when the imide group-containing resin is increased in Tg, when the frame-like pattern is formed, a material imparted with excellent high temperature adhesiveness and hermetic sealability Can be provided.
- a film-like adhesive and adhesive sheet excellent in sticking property low temperature sticking property
- high temperature adhesiveness high temperature adhesiveness
- pattern forming property thermocompression bonding property (low temperature thermocompression bonding property)
- reflow resistance hermetic sealing property
- Airtight sealing means dew resistance (fogging resistance) after the frame pattern of the above-mentioned adhesive is thermocompression-bonded to a support member, cured, and absorbed.
- FIG. 6 is an end view taken along line IV-IV in FIG. 5. It is a top view which shows one Embodiment of the adhesive agent pattern of this invention.
- FIG. 8 is an end view taken along line VV in FIG. 7. It is a top view which shows one Embodiment of the adhesive agent pattern of this invention.
- FIG. 10 is an end view taken along line VI-VI in FIG. 9. It is an end elevation showing one embodiment of a semiconductor device of the present invention. It is an end elevation showing one embodiment of a semiconductor device of the present invention. It is an end view which shows one Embodiment of the manufacturing method of the semiconductor device of this invention. It is an end view which shows one Embodiment of the manufacturing method of the semiconductor device of this invention. It is a top view which shows one Embodiment of the manufacturing method of the semiconductor device of this invention. It is an end view which shows one Embodiment of the manufacturing method of the semiconductor device of this invention. It is an end view which shows one Embodiment of the manufacturing method of the semiconductor device of this invention. It is an end view which shows one Embodiment of the manufacturing method of the semiconductor device of this invention. It is an end view which shows one Embodiment of the manufacturing method of the semiconductor device of this invention.
- FIG. 27 is an end view showing an example of a CMOS sensor using the semiconductor element shown in FIG. 26 as a solid-state image sensor.
- the photosensitive adhesive composition of this embodiment includes (A) an imide group-containing resin having a fluoroalkyl group, (B) a radiation polymerizable compound, (C) a photoinitiator, and (D) a thermosetting component. .
- Tg of the component (A) is preferably 180 ° C. or lower, and more preferably 120 ° C. or lower.
- Tg exceeds 180 ° C.
- the temperature for attaching the film adhesive to the back surface of the wafer is preferably 20 to 150 ° C., more preferably 40 to 100 ° C., from the viewpoint of suppressing warpage of the semiconductor wafer.
- Tg is 180 ° C. or higher, a higher temperature is required for thermocompression bonding after pattern formation.
- the temperature for thermocompression bonding is preferably 60 to 220 ° C., more preferably 100 to 180 ° C., from the viewpoint of suppressing the progress of the thermosetting reaction before thermocompression bonding and the warpage of the semiconductor wafer.
- the Tg of the film adhesive is preferably 180 ° C or lower, more preferably 150 ° C or lower, and 120 ° C or lower. Most preferred. On the other hand, Tg is preferably 20 ° C. or higher, more preferably 40 ° C. or higher, and most preferably 50 ° C. or higher. When Tg is 20 ° C.
- thermosetting material after exposure falls and there exists a tendency for high temperature adhesiveness, reflow resistance, and airtight sealing property to fall.
- Tg means the main dispersion peak temperature when the component (A) is formed into a film. Measured with Rheometrics Viscoelasticity Analyzer “RSA-2” (trade name) under the conditions of a heating rate of 5 ° C / min, a frequency of 1 Hz, and a measurement temperature of -50 to 300 ° C. The peak temperature was taken.
- the weight average molecular weight of the component (A) is preferably controlled within the range of 5000 to 500,000, more preferably 10,000 to 300,000, and still more preferably 10,000 to 100,000. If the weight average molecular weight is within the above range, the strength, flexibility and tackiness of the photosensitive adhesive composition in the form of a sheet or film will be good, and the thermal fluidity will be good. It is possible to ensure good embedding property with respect to the wiring step (unevenness) on the substrate surface. When the weight average molecular weight is less than 5,000, the film formability tends to be insufficient.
- the weight average molecular weight means a weight average molecular weight when measured in terms of polystyrene using high performance liquid chromatography “C-R4A” (trade name) manufactured by Shimadzu Corporation.
- thermocompression bonding temperature By making Tg and weight average molecular weight of a component in the said range, while being able to hold down the bonding temperature to a wafer low, the heating temperature at the time of adhering and fixing a semiconductor element to the support member for semiconductor element mounting (Thermocompression bonding temperature) can also be lowered, and an increase in warpage of the semiconductor element can be suppressed. Moreover, sticking property, thermocompression bonding property and developability can be effectively imparted.
- Examples of the imide group-containing resin (A) include polyimide resins, polyamideimide resins, polyetherimide resins, polyurethaneimide resins, polyurethaneamideimide resins, siloxane polyimide resins, polyesterimide resins, and copolymers thereof. . These can be used individually by 1 type or in combination of 2 or more types. Moreover, it is preferable to have ethylene oxide and a propylene ether skeleton in the principal chain and / or side chain of these resin at the point of alkali solubility.
- the component (A) can be obtained, for example, by subjecting tetracarboxylic dianhydride and diamine to a condensation reaction by a known method. That is, in the organic solvent, tetracarboxylic dianhydride and diamine are equimolar, or if necessary, the total amount of diamine is preferably 0.00 with respect to the total 1.0 mol of tetracarboxylic dianhydride.
- the composition ratio is adjusted in the range of 5 to 2.0 mol, more preferably 0.8 to 1.0 mol (the order of addition of each component is arbitrary), and the addition reaction is performed at a reaction temperature of 80 ° C. or lower, preferably 0 to 60 ° C. .
- the polyimide resin can be obtained by dehydrating and ring-closing the reactant (polyamide acid).
- the dehydration ring closure can be performed by a thermal ring closure method in which heat treatment is performed, a chemical ring closure method using a dehydrating agent, or the like.
- the component (A) imide group-containing resin is preferably a resin containing a structural unit represented by the following general formula (A).
- Q represents a tetravalent organic group.
- a tetravalent organic group having a biphenyl skeleton a tetravalent organic group having a naphthyl skeleton, a tetravalent organic group having a benzophenone skeleton, Examples thereof include a tetravalent organic group having an alicyclic skeleton and a tetravalent organic group having a fluoroalkyl group.
- the tetracarboxylic dianhydride used as a raw material for the imide group-containing resin is not particularly limited when the diamine component contains a fluoroalkyl group.
- the diamine component contains a fluoroalkyl group.
- 4′-biphenyltetracarboxylic dianhydride 2,2 ′, 3,3′-biphenyltetracarboxylic dianhydride, 2,3,3 ′, 4′-biphenyltetracarboxylic dianhydride, 3, Acid dianhydrides having a biphenyl skeleton such as 4,3 ′, 4′-biphenyltetracarboxylic dianhydride, 1,2,5,6-naphthalene tetracarboxylic dianhydride, 1,4,5,8- Naphthalene tetracarboxylic dianhydride, 2,3,6,7-naphthalene tetracarboxylic dianhydride, 1,2,4,5-naphthalene tetracarboxylic dianhydride, etc.
- 1,2,3,4-butanetetracarboxylic dianhydride decahydronaphthalene-1,4,5,8-tetracarboxylic dianhydride, 4,8-dimethyl- 1,2,3,5,6,7-hexahydronaphthalene-1,2,5,6-tetracarboxylic dianhydride, cyclopentane-1,2,3,4-tetracarboxylic dianhydride, 1 , 2,3,4-cyclobutanetetracarboxylic dianhydride, bis (exo-bicyclo [2,2,1] heptane-2,3-dicarboxylic dianhydride, bicyclo- [2,2,2] -oct Acid dianhydrides having an alicyclic skeleton such as -7-ene-2,3,5,6-tetracarboxylic dianhydride and 2,2-bis (3,4-dicarboxyphenyl) hexafluoropropane Anhydride,
- the tetracarboxylic dianhydride represented by the general formula (1) can be synthesized from, for example, trimellitic anhydride monochloride and the corresponding diol, specifically 1,2- (ethylene) bis ( Trimellitate anhydride), 1,3- (trimethylene) bis (trimellitic anhydride), 1,4- (tetramethylene) bis (trimellitate anhydride), 1,5- (pentamethylene) bis (trimellitate anhydride), 1 , 6- (Hexamethylene) bis (trimellitic anhydride), 1,7- (heptamethylene) bis (trimellitic anhydride), 1,8- (octamethylene) bis (trimellitic anhydride), 1,9- (nonamethylene) ) Bis (trimellitic anhydride), 1,10- (decamethylene) bis (trimellitate anhydrous), 1,12- (dodecamechi) Emissions) bis (trimellitate anhydride), 1,16 (hexamethylene decamethylene) bis (
- tetracarboxylic dianhydride from the viewpoint of imparting good solubility in solvents and alkalis and moisture resistance, transparency to 365 nm light, and thermocompression bonding, the following general formula (2) or (3)
- the tetracarboxylic dianhydride represented is preferably used.
- tetracarboxylic dianhydrides can be used singly or in combination of two or more.
- 2,2-bis (3,4-dicarboxyphenyl) hexafluoropropane dianhydride is used as the tetracarboxylic dianhydride used as a raw material for the imide group-containing resin.
- diamine used as a raw material of imide group containing resin In order to adjust Tg of a polymer, solubility, and alkali solubility, the following diamine can be used.
- the following diamine can be used.
- 3,3′-diaminodiphenyl sulfide, 3,4′-diaminodiphenyl sulfide, 4,4′-diaminodiphenyl sulfide, bis (4- (3- Aminoenoxy) phenyl) sulfide and bis (4- (4-aminoenoxy) phenyl) sulfide are preferably used.
- aromatic diamines such as 3,5-diaminobenzoic acid and 3,3′-dihydroxy-4,4′-diaminobiphenyl can also be used.
- Etc In the following general formula (8), R 1 , R 2 and R 3 each independently represents an alkylene group having 1 to 10 carbon atoms, and b represents an integer of 2 to 80.
- R 4 and R 9 each independently represents an alkylene group having 1 to 5 carbon atoms or a phenylene group which may have a substituent
- Each of 8 independently represents an alkyl group having 1 to 5 carbon atoms, a phenyl group or a phenoxy group
- d represents an integer of 1 to 5.
- diamine component a fluoroalkyl group represented by the following general formula (19), (20), (21) or (22) is used from the viewpoints of pattern formability (dissolvable development, thinning) and thermocompression bonding.
- the diamine contained is preferably used.
- each X is independently a single bond, —O—, —S—, —SO 2 —, —CO—, —CH 2 —, —C (CH 3 ) 2 —, —CF 2 —, — C (CF 3 ) 2 —
- Y is an organic group having 1 to 30 carbon atoms including a fluoroalkyl group
- Z is independently —H, an alkyl group having 1 to 10 carbon atoms, a carboxyl group, An organic group containing a phenolic hydroxyl group, a sulfo group, a thiol group, or a fluoroalkyl group is shown.
- the imide group-containing resin preferably has an alkali-soluble group from the viewpoint of pattern formation.
- the alkali-soluble group is a carboxyl group, a phenolic hydroxyl group, or a glycol group, and further has a carboxyl group and / or a phenolic hydroxyl group in the side chain in that pattern formation and high-temperature adhesiveness can be sufficiently imparted. Is more preferable, and a phenolic hydroxyl group is most preferable.
- imide group containing resin which has a carboxyl group in a side chain
- it can obtain by making an acid dianhydride and the following carboxyl group containing diamine react.
- carboxyl group-containing diamine a carboxyl group-containing aromatic diamine represented by the following general formula (4) or (5) is preferably used in order to adjust pattern forming properties, thermocompression bonding properties, and reflow resistance.
- the phenolic hydroxyl group-containing diamine used as a raw material for the imide group-containing resin is not particularly limited as long as the tetracarboxylic dianhydride and the diamine contain a fluoroalkyl group, and 2,2′-bis (3-amino -4-hydroxyphenyl) hexafluoropropane, 3,3'-dihydroxy-4,4'-diaminobiphenyl, 3,3'-diamino-4,4'-dihydroxydiphenylsulfone, 2,2'diaminobisphenol A, bis (2-hydroxy-3-amino-5-methylphenyl) methane, 2,6-di ⁇ (2-hydroxy-3-amino-5-methylphenyl) methyl ⁇ -4-methylphenol, 2,6-di ⁇ Compounds such as (2-hydroxy-3-amino-5-methylphenyl) methyl ⁇ -4-hydroxybenzoate propyl Rukoto can. These compounds may be used alone or in
- fluoroalkyl group-containing diphenol diamines represented by the following general formula (6) are used from the viewpoints of pattern formability (dissolvable development, thinning), thermocompression bonding, high temperature adhesion, and reflow resistance. It is preferable to use it.
- this diamine it is preferable that it is 80 mol% or less of a total diamine from a viewpoint of sticking property, thermocompression bonding property, and high temperature adhesiveness, and it is more preferable that it is 60 mol% or less.
- the imide group-containing Tg can be adjusted to the above range, and it is possible to impart sticking property, thermocompression bonding property, high temperature adhesion property, reflow resistance and airtight sealing property. It becomes.
- the dissolution developability means that a pattern is formed while the unexposed portion is dissolved in the developer.
- the aliphatic ether diamine represented by following General formula (8) is given at the point which provides compatibility with another component, organic solvent solubility, alkali solubility, low temperature sticking property, and low temperature thermocompression bonding property.
- ethylene glycol and / or propylene glycol-based diamines are more preferable. Since the aliphatic ether diamine as described above is a flexible skeleton exhibiting high hydrophilicity, Tg can be reduced without impairing alkali solubility.
- R 1 , R 2 and R 3 each independently represents an alkylene group having 1 to 10 carbon atoms, and b represents an integer of 2 to 80.
- aliphatic ether diamines include Jeffamine D-230, D-400, D-2000, D-4000, ED-600, ED-900, ED-2000, and EDR manufactured by Sun Techno Chemical Co., Ltd. 148, aliphatic diamines such as polyoxyalkylene diamines such as polyetheramine D-230, D-400, D-2000 and the like. These diamines are preferably 1 to 80 mol%, more preferably 5 to 60 mol% of the total diamine. When this amount is less than 1 mol%, it tends to be difficult to impart high-temperature adhesiveness and hot fluidity. On the other hand, when it exceeds 80 mol%, the Tg of the imide group-containing resin becomes too low, The self-supporting property of the film tends to be impaired.
- the aliphatic ether diamine preferably has a propylene ether skeleton represented by the following general formula (7) and has a molecular weight of 300 to 600 from the viewpoint of pattern formation.
- a diamine it is preferable that it is 80 mol% or less of a total diamine from a viewpoint of the self-support property of a film, high temperature adhesiveness, reflow resistance, and airtight sealing, and it is 60 mol% or less. More preferred.
- the imide group-containing Tg can be adjusted to the above range, and it is possible to impart sticking property, thermocompression bonding property, high temperature adhesion property, reflow resistance and airtight sealing property. It becomes.
- m represents an integer of 3 to 7.
- the siloxane diamine represented by following General formula (9) is preferable at the point which provides the adhesiveness and adhesiveness in room temperature.
- R 4 and R 9 each independently represents an alkylene group having 1 to 5 carbon atoms or a phenylene group which may have a substituent
- Each of 8 independently represents an alkyl group having 1 to 5 carbon atoms, a phenyl group or a phenoxy group
- d represents an integer of 1 to 5.
- diamines are preferably 5 to 50 mol%, more preferably 10 to 30 mol% of the total diamine.
- the amount is less than 5 mol%, the effect of adding siloxane diamine is reduced.
- the amount is more than 50 mol%, compatibility with other components, high-temperature adhesiveness, and developability tend to be lowered.
- the above-mentioned diamines can be used alone or in combination of two or more.
- the fluoroalkyl group-containing diphenol diamine represented by the above structural formula as a raw material diamine is 20 to 60 mol% of the total diamine and has a molecular weight of 300 to 600. It is most preferable to use an imide group-containing resin in which ether diamine is 20 to 60 mol% of the total diamine, siloxane diamine is 10 to 30 mol%, and Tg is 50 to 120 ° C.
- the imide group-containing resin can be used alone or in combination (blend) of two or more as required.
- a monofunctional acid anhydride such as a compound represented by the following general formula (10), (11) or (12) and / or the following general formula (23)
- a monofunctional amine such as a compound represented by the following general formula (10), (11) or (12) and / or the following general formula (23)
- the functional group other than the acid anhydride or diamine is not particularly limited, but is preferably an alkali-soluble group such as a carboxyl group, a phenolic hydroxyl group, or a glycol group in terms of improving alkali solubility during pattern formation.
- the compound which has radiation-polymerizable groups and / or thermosetting groups, such as the compound represented by the said General formula (12), and the (meth) acrylate which has an amino group is preferably used by the point which provides adhesiveness. .
- a compound having a siloxane skeleton or the like is also preferably used in terms of imparting low hygroscopicity.
- the imide group-containing resin preferably has a transmittance with respect to 365 nm of 10% or more, more preferably 20% or more when formed into a 30 ⁇ m film.
- the content of the component (A) is preferably 5 to 90% by mass based on the total solid content of the photosensitive adhesive composition, and is preferably 10 to 80% by mass. It is more preferable that the content is 20 to 70% by mass. If this content is less than 5% by mass, the developability during pattern formation tends to be insufficient, and if it exceeds 90% by mass, the developability and adhesiveness during pattern formation tend to be insufficient.
- a resin having a carboxyl group and / or a hydroxyl group and / or a resin having a hydrophilic group is added as a dissolution aid. Also good.
- the resin having a hydrophilic group is not particularly limited as long as it is an alkali-soluble resin, and examples thereof include resins having glycol groups such as ethylene glycol and propylene glycol groups.
- the photosensitive adhesive composition of this embodiment comprises (D) a curable component, (D1) an epoxy resin, (D2) a compound having an ethylenically unsaturated group and an epoxy group, (D3) a phenol compound, and a curing accelerator. Etc. may be included.
- (D1) As an epoxy resin, what contains at least 2 or more epoxy group in a molecule
- glycidyl ether of bisphenol A type (or AD type, S type, F type), glycidyl ether of water-added bisphenol A type, glycidyl of ethylene oxide adduct bisphenol A type
- examples include ether, propylene oxide adduct bisphenol A-type glycidyl ether, trifunctional (or tetrafunctional) glycidyl ether, glycidyl ester of dimer acid, trifunctional (or tetrafunctional) glycidylamine, and the like. These can be used alone or in combination of two or more.
- decrease temperature is 150 degreeC or more from a viewpoint of low outgassing property, high temperature adhesiveness, and reflow resistance, It is preferable that it is 180 degreeC or more, It is 200 degreeC or more. Is more preferred, and most preferred is 260 ° C. or higher.
- the 5% mass reduction temperature (hereinafter referred to as “5% mass reduction temperature”) means that the sample is heated at a rate of 10 ° C. using a differential thermothermal gravimetric simultaneous measurement device (manufactured by SII Nanotechnology: TG / DTA6300). / Min, 5% mass loss temperature when measured under a nitrogen flow (400 ml / min).
- the epoxy resin it is possible to use a high-purity product in which impurity ions such as alkali metal ions, alkaline earth metal ions, halogen ions, particularly chlorine ions and hydrolyzable chlorine are reduced to 300 ppm or less. From the viewpoint of prevention and corrosion prevention of metal conductor circuits.
- impurity ions such as alkali metal ions, alkaline earth metal ions, halogen ions, particularly chlorine ions and hydrolyzable chlorine are reduced to 300 ppm or less.
- the content of the epoxy resin is preferably 1 to 100 parts by mass and more preferably 5 to 50 parts by mass with respect to 100 parts by mass of the component (A).
- this content exceeds 100 mass parts, the solubility to alkaline aqueous solution will fall, and there exists a tendency for a handleability and pattern formation property to fall.
- the content is less than 5 parts by mass, there is a tendency that sufficient thermocompression bonding property and high-temperature adhesiveness cannot be obtained.
- (D2) a compound having an ethylenically unsaturated group and an epoxy group may be further contained.
- examples of the ethylenically unsaturated group include vinyl group, allyl group, propargyl group, butenyl group, ethynyl group, phenylethynyl group, maleimide group, and nadiimide.
- Group, a (meth) acryl group, and the like, and a (meth) acryl group is preferable from the viewpoint of reactivity.
- the component (D2) is not particularly limited, but in addition to glycidyl methacrylate, glycidyl acrylate, 4-hydroxybutyl acrylate glycidyl ether, 4-hydroxybutyl methacrylate glycidyl ether, functional groups that react with epoxy groups and ethylenically unsaturated groups And a compound obtained by reacting a compound having a polyfunctional epoxy resin with a polyfunctional epoxy resin.
- a functional group which reacts with the said epoxy group An isocyanate group, a carboxyl group, a phenolic hydroxyl group, a hydroxyl group, an acid anhydride, an amino group, a thiol group, an amide group etc. are mentioned. These compounds can be used individually by 1 type or in combination of 2 or more types.
- the component (D2) is, for example, a polyfunctional epoxy resin having at least two epoxy groups in one molecule in the presence of triphenylphosphine or tetrabutylammonium bromide, and 0.1 to 0 with respect to 1 equivalent of the epoxy group. Obtained by reacting with 9 equivalents of (meth) acrylic acid.
- Component (D2) has a 5% mass reduction temperature of 150 ° C. from the viewpoints of storage stability, adhesiveness, low outgassing, high temperature adhesiveness, reflow resistance, and hermetic sealing of the package during and after assembly heating.
- the temperature is 180 ° C. or higher, more preferably 200 ° C. or higher, and most preferably 260 ° C. or higher.
- the component (D2) high purity in which alkali metal ions, alkaline earth metal ions, halogen ions, particularly chlorine ions and hydrolyzable chlorine are reduced to 1000 ppm or less, more preferably 300 ppm or less as impurity ions. It is preferable to use a product from the viewpoint of preventing electromigration and preventing corrosion of a metal conductor circuit.
- the impurity ion concentration can be satisfied by using a polyfunctional epoxy resin with reduced alkali metal ions, alkaline earth metal ions, halogen ions, and the like as a raw material.
- the component (D2) satisfying the heat resistance and purity is not particularly limited, but bisphenol A type (or AD type, S type, F type) glycidyl ether, bisphenol A type glycidyl ether, ethylene oxide adduct Bisphenol A and / or F type glycidyl ether, propylene oxide adduct bisphenol A and / or F type glycidyl ether, phenol novolac resin glycidyl ether, cresol novolac resin glycidyl ether, bisphenol A novolac resin glycidyl ether, naphthalene resin Glycidyl ether, trifunctional (or tetrafunctional) glycidyl ether, dicyclopentadiene phenolic resin glycidyl ether, dimer acid glycidyl ester, trifunctional (or tetrafunctional) Glycidyl amines include those in which a raw material glycidyl amines of
- the number of epoxy groups and ethylenically unsaturated groups in the component (D2) is 3 or less in order to improve the thermocompression bonding property, low stress property and adhesiveness, and maintain developability during pattern formation.
- the number of ethylenically unsaturated groups is preferably 2 or less.
- the component (D2) is not particularly limited, but compounds represented by the following general formula (13), (14), (15), (16) or (17) are preferably used.
- R 12 and R 16 represent a hydrogen atom or a methyl group
- R 10 , R 11 , R 13 and R 14 represent a divalent organic group
- R 15 to R 18 represents an organic group having an epoxy group or an ethylenically unsaturated group.
- the content of the component (D2) is preferably 5 to 100 parts by mass with respect to 100 parts by mass of the component (A), and 10 to 70 parts by mass. Is more preferable. If this content exceeds 100 parts by mass, the thixotropy tends to be reduced during film formation, and film formation tends to be difficult, and tackiness tends to increase, resulting in insufficient handling properties. Moreover, the developability at the time of pattern formation tends to be lowered due to poor solubility of the resin composition, and the melt viscosity after photocuring tends to be too low, so that the pattern tends to be deformed at the time of thermocompression bonding. On the other hand, when the content of the component (D2) is less than 5 parts by mass, the thermocompression bonding property, the high temperature adhesion property, and the reflow resistance tend to decrease.
- the phenolic compound is preferably a phenolic compound having at least two or more phenolic hydroxyl groups in the molecule from the viewpoints of pattern formation, high-temperature adhesion, and reflow resistance.
- examples of such compounds include phenol novolak, cresol novolak, t-butylphenol novolak, dicyclopentadiene cresol novolak, dicyclopentadienephenol novolak, xylylene-modified phenol novolak, naphthol compound, trisphenol compound, tetrakisphenol novolak, bisphenol.
- the content of the (D3) phenol compound is preferably 1 to 100 parts by weight, more preferably 2 to 50 parts by weight, and more preferably 2 to 30 parts by weight with respect to 100 parts by weight of the component (A). Most preferred. When this content exceeds 100 parts by mass, the reactivity of the reactive compound having an ethylenically unsaturated group and epoxy group and the radiation-polymerizable compound at the time of exposure becomes poor, or the hydrophilicity of the resin increases, thereby developing.
- the film thickness tends to decrease or swell.
- the penetration of the developer into the resin pattern increases, outgassing during subsequent heat curing and assembly heat history tends to increase, and heat resistance reliability and moisture resistance reliability tend to be greatly reduced.
- the content is less than 1 part by mass, there is a tendency that sufficient high-temperature adhesiveness cannot be obtained.
- (D3) The reason why the pattern forming property is improved by containing the phenol compound is considered to be as follows.
- the photosensitive adhesive composition exists as a low molecular weight alkali-soluble monomer during development.
- a dissolution accelerator in the composition, the solubility is partially increased, and the developer is likely to penetrate.
- a carboxyl group-containing resin is used as a dissolution accelerator as described above, the reaction with the epoxy resin proceeds by heat drying during film formation, and the pattern formability tends to decrease.
- the photosensitive adhesive composition exists as a low molecular weight thermosetting monomer at the time of thermosetting.
- a low molecular weight curing agent in the composition, molecular movement is facilitated when heated, and curing is likely to proceed.
- a phenol compound represented by the following general formula (26) it is preferable to use a phenol compound represented by the following general formula (26) because it has a high 5% mass reduction temperature and can sufficiently impart pattern forming properties.
- the low molecular weight phenol compound represented by the following general formula (26) it is possible to achieve both good pattern forming properties and high temperature adhesiveness.
- the total amount of the component (D) is preferably 10 to 150 parts by mass, and preferably 20 to 120 parts by mass with respect to 100 parts by mass of the component (A) in that pattern forming properties and thermocompression bonding properties can be sufficiently provided. Is more preferable, and most preferably 30 to 100 parts by mass. By setting it as the above range, pattern formation property can fully be provided. Moreover, thermocompression-bonding property can fully be provided because the low molecular weight component which remains after the light irradiation at the time of pattern formation increases.
- the thermocompression bonding property can be imparted by reducing the melt viscosity after light irradiation.
- the minimum melt viscosity at 20 ° C. to 200 ° C. after light irradiation is preferably 30000 Pa ⁇ s or less, more preferably 20000 Pa ⁇ s or less, and most preferably 10000 Pa ⁇ s or less. .
- transformation at the time of thermocompression bonding 100 Pa.s or more is preferable and 1000 Pa.s or more is more preferable.
- the minimum melt viscosity is a sample that is irradiated with a light amount of 1000 mJ / cm 2 , developed, washed with water, and heated and dried at 120 ° C. for 10 minutes, and a viscoelasticity measuring device ARES (Rheometrics Scientific F.E.
- ARES Rivest Cipher Scientific F.E.
- the minimum value of the melt viscosity at 50 ° C. to 200 ° C. when measured using The measurement plate was a parallel plate having a diameter of 8 mm, and the measurement conditions were set at a temperature increase of 5 ° C./min, a measurement temperature of 20 to 200 ° C., and a frequency of 1 Hz.
- the curing accelerator is not particularly limited as long as it contains a curing accelerator that accelerates curing / polymerization of epoxy by heating.
- a curing accelerator that accelerates curing / polymerization of epoxy by heating.
- examples include tetraphenylborate, 2-ethyl-4-methylimidazole-tetraphenylborate, 1,8-diazabicyclo [5.4.0] undecene-7-tetraphenylborate.
- the content of the curing accelerator in the photosensitive adhesive composition is preferably 0.01 to 50 parts by mass with respect to 100 parts by mass of the epoxy resin.
- thermosetting temperature is preferably 100 ° C. to 220 ° C., more preferably 120 ° C. to 200 ° C., and most preferably 150 ° C. to 180 ° C.
- the curing temperature is 220 ° C. or higher, thermal damage to peripheral materials is increased, thermal stress is generated, and the adhesive resin composition tends to become brittle and high-temperature adhesiveness is decreased. There is a tendency that the curing reaction of the thermosetting component does not proceed and the high-temperature adhesiveness decreases, and the curing time becomes long.
- Examples of the radiation polymerizable compound include compounds having an ethylenically unsaturated group.
- Examples of the ethylenically unsaturated group include a vinyl group, an allyl group, a propargyl group, a butenyl group, an ethynyl group, a phenylethynyl group, and a maleimide.
- Such acrylate is not particularly limited, but diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylolpropane diacrylate.
- R 19 and R 20 each independently represent a hydrogen atom or a methyl group, and g and h each independently represent an integer of 1 to 20.
- radiation polymerizable compounds can be used singly or in combination of two or more.
- the radiation-polymerizable compound having a glycol skeleton represented by the general formula (18) is preferable in that it is alkali-soluble and can sufficiently impart solvent resistance after curing.
- Urethane acrylate and methacrylate, isocyanuric acid-containing acrylate and Methacrylate is preferred in that it can sufficiently impart high adhesion after curing.
- the photosensitive adhesive composition of the present invention preferably contains a trifunctional or higher functional acrylate compound as the radiation-polymerizable compound (B).
- the adhesiveness after curing can be further improved and outgassing during heating can be suppressed.
- the photosensitive adhesive composition of this invention is represented by following General formula (27) at the point which can fully provide pattern formation property, heat resistance, and airtight sealing as (B) radiation polymerizable compound. It is most preferable to contain an isocyanuric acid ethylene oxide-modified diacrylate and / or an isocyanuric acid ethylene oxide-modified triacrylate represented by the following general formula (28).
- the radiation-polymerizable compound having a high functional group equivalent preferably has a polymerization functional group equivalent of 200 eq / g or more, more preferably 300 eq / g or more, and most preferably 400 eq / g or more.
- a radiation polymerizable compound having a glycol skeleton, urethane group and / or isocyanuric group having a polymerization functional group equivalent of 200 eq / g or more By using a radiation polymerizable compound having a glycol skeleton, urethane group and / or isocyanuric group having a polymerization functional group equivalent of 200 eq / g or more, the developability and adhesiveness of the photosensitive adhesive composition are improved, and low stress is achieved. And lower warpage.
- a radiation polymerizable compound having a polymerization functional group equivalent of 200 eq / g or more and a radiation polymerizable compound having a polymerization functional group equivalent of 200 eq / g or less may be used in combination.
- the content of the (B) radiation polymerizable compound is preferably 10 to 300 parts by mass, more preferably 20 to 250 parts by mass, and 40 to 100 parts by mass with respect to 100 parts by mass of the component (A). Most preferably.
- this content exceeds 300 parts by mass, the fluidity at the time of heat melting decreases due to polymerization, and the adhesiveness at the time of thermocompression bonding tends to decrease.
- it is less than 10 parts by mass, the solvent resistance after photocuring by exposure becomes low and it becomes difficult to form a pattern, that is, the change in film thickness before and after development increases and / or the residue increases. There is a tendency. Moreover, it melts during thermocompression bonding and the pattern tends to be deformed.
- the component (C) (photoinitiator) is not particularly limited, but preferably has a molecular extinction coefficient of 1000 ml / g ⁇ cm or more with respect to light having a wavelength of 365 nm, from the viewpoint of improving sensitivity, and is preferably 2000 ml / g ⁇ cm. The above is more preferable.
- a 0.001 mass% acetonitrile solution of the sample is prepared, and the absorbance of this solution is measured using a spectrophotometer (manufactured by Hitachi High-Technologies Corporation, “U-3310” (trade name)). Is required.
- the component (C) is more preferably bleached by light irradiation.
- Examples of such component (C) include 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2,2-dimethoxy-1,2-diphenylethane-1-one.
- Benzyl derivatives such as aromatic ketones, benzyldimethyl ketal, 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, 2- (o-chlorophenyl) -4,5-di (m-methoxyphenyl) imidazole Dimer, 2- (o-fluorophenyl) -4,5-phenylimidazole dimer, 2- (o Methoxyphenyl) -4,5-diphenylimidazole dimer, 2- (p-methoxyphenyl) -4,5-diphenylimidazole dimer, 2,4-di (p-methoxyphenyl) -5-phenylimidazole dimer 2,4,5-triarylimidazole dimers such as 2- (2,4-dimethoxyphenyl) -4,5-diphenylimidazole dimer, 9-phenylacridine, 1,7-bis (9 , 9'-acridinyl) h
- Component may contain the photoinitiator which expresses the function which accelerates
- a photoinitiator include a photobase generator that generates a base by irradiation, a photoacid generator that generates an acid by irradiation, and the photobase generator is particularly preferable.
- the photobase generator By using the photobase generator, the high-temperature adhesion and moisture resistance of the photosensitive adhesive composition to the adherend can be further improved.
- the base generated from the photobase generator can act as a curing catalyst for the thermosetting resin such as an epoxy resin, so that the crosslinking density can be further increased. This is thought to be because it hardly corrodes the substrate.
- the crosslink density can be improved, and the outgas during standing at high temperature can be further reduced. Furthermore, it is considered that the curing process temperature can be lowered and shortened.
- the photosensitive adhesive composition containing a photobase generator a base is generated by irradiation of the radiation, whereby the carboxyl remaining after the reaction of the above carboxyl group and / or hydroxyl group with the epoxy resin.
- the group and / or hydroxyl group can be reduced, and the reflow resistance and adhesiveness can be made compatible with pattern formation at a higher level.
- any compound that generates a base upon irradiation can be used without particular limitation.
- a strongly basic compound is preferable in terms of reactivity and curing speed.
- a pKa value that is a logarithm of an acid dissociation constant is used as a basic index, and a base having a pKa value in an aqueous solution of 7 or more is preferable, and a base of 9 or more is more preferable.
- an oxime derivative that generates a primary amino group upon irradiation with actinic rays or a commercially available 2-methyl-1- (4- (methylthio) phenyl) -2 as a photoradical generator.
- (C) As a photoinitiator, from the viewpoint of heat resistance, a compound having an oxime ester group represented by the following general formula (29) and / or a morpholine ring represented by the following general formula (30) or (31) It is preferable to use a compound having
- R 21 and R 22 each independently represents a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, or an organic group containing an aromatic hydrocarbon group, and R 23 represents one having 1 to 7 carbon atoms.
- An alkyl group or an organic group containing an aromatic hydrocarbon group is shown, and R 24 is an organic group containing an aromatic hydrocarbon group.
- the aromatic hydrocarbon group is not particularly limited, and examples thereof include a phenyl group, a naphthyl group, a benzoin derivative, a carbazole derivative, a thioxanthone derivative, and a benzophenone derivative. Moreover, the aromatic hydrocarbon group may have a substituent.
- the photoinitiator is a compound having an oxime ester group and / or a morpholine ring, and has a molecular extinction coefficient of 1000 ml / g ⁇ cm or more for light having a wavelength of 365 nm and a 5% mass reduction temperature. Is a compound having a temperature of 150 ° C. or higher.
- Examples of such a photoinitiator include compounds represented by the following general formula (32), (33) or (34).
- a photoinitiator By using such a photoinitiator, good sensitivity can be obtained at the time of pattern formation, and film loss during development and unevenness of the adhesive surface layer can be suppressed, which can improve the height accuracy after thermocompression bonding. it can.
- the compound represented by the following general formula (33) is commercially available as “I-OXE02” (trade name, manufactured by Ciba Japan).
- the photosensitive adhesive composition of this embodiment contains a compound having an oxime ester group and / or a morpholine ring as a photoinitiator
- the photosensitive adhesive composition may further contain another photoinitiator. it can.
- the photosensitive adhesive composition is used as an adhesive layer having a thickness of 30 ⁇ m or less, a compound having an oxime ester group and / or a morpholine ring may be contained alone, but an adhesive layer having a thickness of 50 ⁇ m or more and In this case, it is preferable to use in combination with another photoinitiator.
- Examples of the other photoinitiators include 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2,2-dimethoxy-1,2-diphenylethane-1-one, Fragrances such as 1-hydroxy-cyclohexyl-phenyl-ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropanone-1,2,4-diethylthioxanthone, 2-ethylanthraquinone, phenanthrenequinone Benzyl derivatives such as aromatic ketones, benzyldimethyl ketal, 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, 2- (o-chlorophenyl) -4,5-di (m-methoxyphenyl) imidazole 2-mer, 2- (o-fluorophenyl) -4,5-phenylimidazole dimer, 2- (o-
- the compound represented by the general formula (32), or the compound represented by the general formula (33) and / or the compound represented by the general formula (34), and the photoinitiator that photobleaches are used in combination. It is preferable. By using these in combination, it is possible to obtain a photosensitive adhesive having both good pattern forming properties, thermocompression bonding properties, and high-temperature adhesion properties.
- the photosensitive adhesive composition of the present embodiment can contain (E) peroxide as a thermal radical generator, if necessary.
- E) As a peroxide an organic peroxide is preferable.
- the organic peroxide preferably has a one minute half-life temperature of 120 ° C. or higher, more preferably 150 ° C. or higher.
- the organic peroxide is selected in consideration of preparation conditions of the photosensitive adhesive composition, film forming temperature, curing (bonding) conditions, other process conditions, storage stability, and the like.
- the peroxide that can be used is not particularly limited.
- the amount of peroxide added is preferably 0.01 to 20% by weight, more preferably 0.1 to 10% by weight, and more preferably 0.5 to 5% by weight based on the total amount of the compound having an ethylenically unsaturated group. Mass% is most preferred. If it is 0.01% by mass or less, the curability is lowered, the effect of addition is reduced, and if it exceeds 5% by mass, the outgas amount is increased and the storage stability is decreased.
- the peroxide is not particularly limited as long as it has a half-life temperature of 120 ° C. or higher.
- perhexa 25B manufactured by NOF Corporation
- 2,5-dimethyl-2,5-di and t-butylperoxyhexane (1 minute half-life temperature: 180 ° C.
- Parkmill D manufactured by NOF Corporation
- dicumyl peroxide (1 minute half-life temperature: 175 ° C.
- the photosensitive adhesive composition of the present invention may contain (F) filler as appropriate.
- the filler include metal fillers such as silver powder, gold powder, copper powder, and nickel powder, alumina, aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, Inorganic fillers such as aluminum oxide, aluminum nitride, crystalline silica, amorphous silica, boron nitride, titania, glass, iron oxide, and ceramics, and organic fillers such as carbon and rubber fillers are included. Regardless, it can be used without any particular restrictions.
- the filler can be used properly according to the desired function.
- a metal filler is added for the purpose of imparting conductivity, thermal conductivity, thixotropy, etc. to the resin composition
- a nonmetallic inorganic filler is added to the adhesive layer for thermal conductivity, low thermal expansion, low hygroscopicity, etc.
- the organic filler is added for the purpose of imparting toughness to the adhesive layer.
- metal fillers, inorganic fillers or organic fillers can be used singly or in combination of two or more.
- metal fillers, inorganic fillers, or insulating fillers are preferable in terms of being able to impart conductivity, thermal conductivity, low moisture absorption characteristics, insulating properties, and the like required for adhesive materials for semiconductor devices, and inorganic fillers or insulating fillers.
- a silica filler is more preferable in that it has good dispersibility with respect to the resin varnish and can impart a high adhesive force when heated.
- the filler preferably has an average particle size of 10 ⁇ m or less and a maximum particle size of 30 ⁇ m or less, more preferably an average particle size of 5 ⁇ m or less and a maximum particle size of 20 ⁇ m or less.
- the average particle diameter exceeds 10 ⁇ m and the maximum particle diameter exceeds 30 ⁇ m, the effect of improving fracture toughness tends to be insufficient.
- the lower limits of the average particle size and the maximum particle size are not particularly limited, but usually both are 0.001 ⁇ m.
- the content of the filler is determined according to the properties or functions to be imparted, but is preferably 0 to 50% by mass, more preferably 1 to 40% by mass, and more preferably 3 to 30% by mass with respect to the total of the resin component and the filler. Is more preferable.
- the filler content is preferably within the above range.
- the optimum filler content is determined in order to balance the required properties. Mixing and kneading in the case of using a filler can be carried out by appropriately combining dispersers such as ordinary stirrers, raking machines, three rolls, and ball mills.
- various coupling agents can be added in order to improve interfacial bonding between different materials.
- the coupling agent include silane-based, titanium-based, and aluminum-based.
- a silane-based coupling agent is preferable because of its high effect, and a thermosetting group such as an epoxy group, methacrylate, and / or acrylate.
- a compound having a radiation polymerizable group such as is more preferred.
- the boiling point and / or decomposition temperature of the silane coupling agent is preferably 150 ° C. or higher, more preferably 180 ° C. or higher, and even more preferably 200 ° C. or higher. That is, a silane coupling agent having a boiling point of 200 ° C.
- the amount of the coupling agent used is preferably 0.01 to 20 parts by mass with respect to 100 parts by mass of the component (A) to be used, from the viewpoints of the effect, heat resistance and cost.
- an ion scavenger can be further added in order to adsorb ionic impurities and improve insulation reliability during moisture absorption.
- an ion scavenger is not particularly limited, for example, a compound known as a copper damage inhibitor for preventing copper from being ionized and dissolved, such as a triazine thiol compound and a phenol-based reducing agent, a powder form Inorganic compounds such as bismuth-based, antimony-based, magnesium-based, aluminum-based, zirconium-based, calcium-based, titanium-based, zuz-based, and mixed systems thereof.
- IXE-300 antimony type
- IXE-500 bismuth type
- IXE-600 antimony, bismuth mixed type
- IXE-700 magnesium and aluminum mixed system
- IXE-800 zirconium system
- IXE-1100 calcium system
- the amount of the ion scavenger used is preferably 0.01 to 10 parts by mass with respect to 100 parts by mass of component (A) from the viewpoints of the effect of addition, heat resistance, cost and the like.
- the high-temperature adhesiveness is preferably 1 MPa or more, more preferably 2 MPa or more, still more preferably 3 MPa or more, and most preferably 5 MPa or more. .
- the high-temperature adhesiveness it is possible to sufficiently impart heat resistance reliability, reflow resistance, and hermetic sealing properties in a process involving heating such as solder reflow.
- the above high-temperature adhesiveness is a photosensitive adhesive composition having a thickness of about 40 ⁇ m obtained by subjecting a silicon chip having a thickness of 3 mm ⁇ 3 mm ⁇ 400 ⁇ m and a glass substrate having a thickness of 10 mm ⁇ 10 mm ⁇ 0.55 mm to an exposure step, a development step and a heating step
- an external force in the shear direction was applied to the side wall of the silicon chip under the conditions of measurement temperature: 260 ° C., measurement speed: 50 ⁇ m / second, measurement height: 50 ⁇ m.
- Adhesive strength (maximum stress) measured when applied.
- an adhesion tester “Dage-4000” manufactured by Dage is used as a measuring apparatus.
- the above-mentioned photosensitive adhesive preferably has a storage elastic modulus at 110 ° C. of 10 MPa or more, more preferably 15 MPa or more, and most preferably 20 MPa or more.
- a storage elastic modulus at 110 ° C. of 10 MPa or more, more preferably 15 MPa or more, and most preferably 20 MPa or more.
- a film adhesive can be obtained by forming the photosensitive adhesive composition into a film.
- FIG. 1 is an end view showing an embodiment of the film adhesive of the present invention.
- a film adhesive 1 shown in FIG. 1 is obtained by forming the photosensitive adhesive composition into a film.
- the film-like adhesive 1 is formed into a film shape by, for example, applying the photosensitive adhesive composition on the substrate 3 shown in FIG. 2 and drying it.
- the adhesive sheet 100 provided with the base material 3 and the adhesive layer 1 made of the film-like adhesive formed on the base material 3 is obtained.
- FIG. 2 is an end view showing an embodiment of the adhesive sheet 100 of the present invention.
- the adhesive sheet 100 shown in FIG. 2 is comprised from the base material 3 and the adhesive bond layer 1 which consists of a film adhesive provided on the one side.
- FIG. 3 is an end view showing another embodiment of the adhesive sheet of the present invention.
- the adhesive sheet 100 shown in FIG. 3 is comprised from the base material 3, the adhesive bond layer 1 and cover film 2 which consist of a film adhesive provided on the one side of this.
- the film adhesive 1 is prepared by mixing the component (A), the component (B), the component (C), the component (D), and other components added as necessary in an organic solvent.
- a varnish is prepared by kneading, and this varnish is coated on the base material 3 to form a varnish layer.
- the varnish layer is dried by heating, and then the base material 3 is removed. At this time, the substrate 3 can be stored or used in the state of the adhesive sheet 100 without removing the substrate 3.
- the organic solvent used for preparing the varnish is not particularly limited as long as the material can be uniformly dissolved or dispersed.
- examples include dimethylformamide, toluene, benzene, xylene, methyl ethyl ketone, tetrahydrofuran, ethyl cellosolve, ethyl cellosolve acetate, dioxane, cyclohexanone, ethyl acetate, and N-methyl-pyrrolidinone.
- the above mixing and kneading can be performed by appropriately combining dispersers such as a normal stirrer, a raking machine, a three-roller, and a ball mill.
- the drying by the heating is performed at a temperature at which the component (D) does not sufficiently react and the solvent is sufficiently volatilized.
- the “temperature at which the component (D) does not sufficiently react” refers to DSC (for example, “DSC-7 type” (trade name) manufactured by PerkinElmer, Inc.), sample amount: 10 mg
- the temperature is equal to or lower than the peak temperature of the heat of reaction when measured under the conditions of temperature rising rate: 5 ° C./min and measurement atmosphere: air.
- the varnish layer is dried usually by heating at 60 to 180 ° C. for 0.1 to 90 minutes.
- the preferred thickness of the varnish layer before drying is 1 to 200 ⁇ m. If this thickness is less than 1 ⁇ m, the adhesive fixing function tends to be insufficient, and if it exceeds 200 ⁇ m, the residual volatile matter described later tends to increase.
- the preferred residual volatile content of the obtained varnish layer is 10% by mass or less, more preferably 3% by mass or less. If this residual volatile content exceeds 10% by mass, voids tend to remain inside the adhesive layer due to foaming due to solvent volatilization during assembly heating, and the moisture resistance tends to be insufficient. Moreover, there is a tendency that peripheral materials or members are contaminated by volatile components generated during heating.
- the measurement conditions of said residual volatile component are as follows. That is, for the film-like adhesive 1 cut to a size of 50 mm ⁇ 50 mm, the initial mass is M1, and the mass after heating the film-like adhesive 1 in an oven at 160 ° C. for 3 hours is M2, and the following formula To obtain the remaining volatile content (%).
- Formula Residual volatile content (%) [(M2-M1) / M1] ⁇ 100
- the substrate 3 is not particularly limited as long as it can withstand the above drying conditions.
- a polyester film, a polypropylene film, a polyethylene terephthalate film, a polyimide film, a polyetherimide film, a polyether naphthalate film, or a methylpentene film can be used as the substrate 3.
- the film as the substrate 3 may be a multilayer film in which two or more kinds are combined, or the surface may be treated with a release agent such as a silicone or silica.
- the film adhesive 1 and the dicing sheet can be laminated to form an adhesive sheet.
- the dicing sheet is a sheet provided with a pressure-sensitive adhesive layer on a substrate, and the pressure-sensitive adhesive layer may be either a pressure-sensitive type or a radiation curable type.
- the base material is preferably a base material that can be expanded.
- FIG. 5 is a top view showing an embodiment of a semiconductor wafer with an adhesive layer of the present invention
- FIG. 6 is an end view taken along the line IV-IV in FIG.
- a semiconductor wafer 20 with an adhesive layer shown in FIGS. 5 and 6 includes a semiconductor wafer 8 and a film adhesive (adhesive layer) 1 provided on one surface thereof.
- the semiconductor wafer 20 with an adhesive layer is obtained by laminating the film adhesive 1 on the semiconductor wafer 8 while heating.
- the film adhesive 1 can be attached to the semiconductor wafer 8 at a low temperature of about room temperature (25 ° C.) to 150 ° C., for example.
- FIGS. 7, 8, 9 and 10 are respectively a top view showing an embodiment of the adhesive pattern of the present invention
- FIG. 8 is an end view taken along the line VV of FIG. 7
- FIG. FIG. 6 is an end view taken along the line VI.
- the adhesive pattern 1a shown in FIGS. 7, 8, 9 and 10 is formed on the semiconductor wafer 8 as the adherend so as to have a pattern along a substantially square side or a square pattern.
- the adhesive pattern 1a is obtained by laminating the adhesive layer 1 on a semiconductor wafer 8 as an adherend to obtain a semiconductor wafer 20 with an adhesive layer, exposing the adhesive layer 1 through a photomask, and after exposure.
- the adhesive layer 1 is developed by an alkaline developer. Thereby, the semiconductor wafer 20 with an adhesive layer in which the adhesive pattern 1a is formed is obtained.
- FIG. 11 is an end view showing an embodiment of the semiconductor device of the present invention.
- the semiconductor element 12 is bonded to the semiconductor element mounting support member 13 via the film adhesive 1, and the connection terminal (not shown) of the semiconductor element 12 is externally connected via the wire 14. It is electrically connected to a connection terminal (not shown) and sealed with a sealing material 15.
- FIG. 12 is an end view showing another embodiment of the semiconductor device of the present invention.
- the first-stage semiconductor element 12a is bonded to the semiconductor-element mounting support member 13 on which the terminals 16 are formed via the film adhesive 1
- the first-stage semiconductor element 12a is bonded to the first-stage semiconductor element 12a.
- a second-stage semiconductor element 12b is bonded via a film adhesive 1.
- the connection terminals (not shown) of the first-stage semiconductor element 12a and the second-stage semiconductor element 12b are electrically connected to the external connection terminals via the wires 14, and are sealed with a sealing material.
- the film adhesive of the present invention can be suitably used for a semiconductor device having a structure in which a plurality of semiconductor elements are stacked.
- the semiconductor wafer 20 with the adhesive layer shown in FIG. 9 is diced along the broken line D, and the semiconductor element with the adhesive layer after dicing is mounted on the semiconductor element. It can be obtained by thermocompression bonding to the supporting member 13 and bonding them together, followed by steps such as a wire bonding step and, if necessary, a sealing step with a sealing material.
- the heating temperature in the thermocompression bonding is usually 20 to 250 ° C.
- the load is usually 0.01 to 20 kgf
- the heating time is usually 0.1 to 300 seconds.
- FIG. 18 there is a semiconductor device according to an embodiment of the present invention as shown in FIG.
- a method for manufacturing the semiconductor device shown in FIG. 18 will be described in detail with reference to the drawings.
- 13, 14 and 16 to 19 are end views showing an embodiment of a method for manufacturing a semiconductor device of the present invention
- FIG. 15 is a top view showing an embodiment of a method for manufacturing a semiconductor device of the present invention. .
- the manufacturing method of the semiconductor device of the present embodiment includes the following (Step 1) to (Step 7).
- Step 1) Step of laminating a film adhesive (adhesive layer) 1 on the circuit surface 18 of the semiconductor chip (semiconductor element) 12 formed in the semiconductor wafer 8 (FIGS. 13A and 13B) .
- Step 2) A step of patterning the adhesive layer 1 provided on the circuit surface 18 of the semiconductor chip 12 by exposure and development (FIGS. 13C and 14A).
- Step 3) A step of thinning the semiconductor wafer 8 by polishing the semiconductor wafer 8 from the surface opposite to the circuit surface 18 (FIG. 14B).
- Step 4 A step of dicing the semiconductor wafer 8 into a plurality of semiconductor chips 12 by dicing (FIGS. 14C and 16A).
- Step 5 A step of picking up the semiconductor chip 12 and mounting it on a plate-like support member (semiconductor element mounting support member) 13 for a semiconductor device (FIGS. 16B and 17A).
- Step 6) A step of laminating the second semiconductor chip 12b on the adhesive layer 1 patterned on the circuit surface 18 of the semiconductor chip 12a mounted on the support member 13 (FIG. 17B).
- Step 7) A step of connecting the semiconductor chips 12a and 12b to the external connection terminals, respectively (FIG. 18).
- Step 1 In the semiconductor wafer 8 shown in FIG. 13A, a plurality of semiconductor chips 12 divided by dicing lines D are formed. A film adhesive (adhesive layer) 1 is laminated on the surface of the semiconductor chip 12 on the circuit surface 18 side (FIG. 13B).
- a method of laminating the adhesive layer 1 a method of preparing a film-like adhesive previously formed into a film shape and affixing it to the semiconductor wafer 8 is simple, but it is liquid using a spin coat method or the like. A method of applying a varnish of a photosensitive adhesive composition to the semiconductor wafer 8 and drying by heating may be used.
- the adhesive layer 1 is a negative photosensitive adhesive that has a thermocompression bonding property to an adherend after being patterned by exposure and development and is capable of alkali development. More specifically, a resist pattern (adhesive pattern) formed by patterning the adhesive layer 1 by exposure and development has a thermocompression bonding property to an adherend such as a semiconductor chip or a support member. For example, the adhesive pattern and the adherend can be bonded to each other by pressing the adherend to the adhesive pattern while heating if necessary.
- Actinic rays (typically ultraviolet rays) are irradiated to the adhesive layer 1 laminated on the semiconductor wafer 8 through the mask 4 having openings at predetermined positions (FIG. 13C). Thereby, the adhesive layer 1 is exposed in a predetermined pattern.
- the adhesive layer 1 is patterned so that the opening 11 is formed by removing the unexposed portion of the adhesive layer 1 by development using an alkaline developer (FIG. 14A).
- an alkaline developer FIG. 14A
- FIG. 15 is a top view showing a state where the adhesive layer 1 is patterned.
- the bonding pad of the semiconductor chip 12 is exposed. That is, the patterned adhesive layer 1 is a buffer coat film of the semiconductor chip 12.
- a plurality of rectangular openings 11 are formed side by side on each semiconductor chip 12. The shape, arrangement, and number of the openings 11 are not limited to those in the present embodiment, and can be appropriately modified so that a predetermined portion such as a bonding pad is exposed.
- 14 is an end view taken along the line II-II in FIG.
- polishing is performed, for example, by attaching an adhesive film on the adhesive layer 1 and fixing the semiconductor wafer 8 to a polishing jig with the adhesive film.
- the semiconductor wafer 8 is cut along with the adhesive layer 1 and the composite film 5 along the dicing line D. Thereby, a plurality of semiconductor chips 12 each having the adhesive layer 1 and the composite film are obtained (FIG. 16A).
- This dicing is performed using a dicing blade in a state where the whole is fixed to the frame by the dicing tape 40, for example.
- Step 6 A second semiconductor chip 12b is stacked on the adhesive layer 1 on the semiconductor chip 12a mounted on the support member 13 (FIG. 17B). That is, the semiconductor chip 12a and the semiconductor chip 12b located in an upper layer thereof are bonded by the patterned adhesive layer 1 (buffer coat film) interposed therebetween. The semiconductor chip 12b is bonded to a position where the opening 11 is not blocked in the patterned adhesive layer 1. A patterned adhesive layer 1 (buffer coat film) is also formed on the circuit surface 18 of the semiconductor chip 12b.
- the bonding of the semiconductor chip 12b is performed, for example, by a method of thermocompression bonding while heating to a temperature at which the adhesive layer 1 exhibits fluidity. After the thermocompression bonding, the adhesive layer 1 is heated as necessary to further cure.
- Step 7 Thereafter, the semiconductor chip 12a is connected to an external connection terminal on the support member 13 via a wire 14a connected to the bonding pad, and the semiconductor chip 12b is connected to the support member 13 via a wire 14b connected to the bonding pad. Connected to the external connection terminal.
- the stacked body including the semiconductor chips 12a and 12b is sealed with the sealing material 15 to obtain the semiconductor device 200 (FIG. 18).
- the manufacturing method of the semiconductor device of the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the gist of the present invention.
- the order of (Step 1) to (Step 7) can be changed as appropriate.
- dicing may be performed after the semiconductor wafer 8 on which the adhesive layer 1 is formed is thinned by polishing.
- the adhesive layer 1 is patterned by exposure and development to obtain a laminate similar to that shown in FIG.
- the semiconductor wafer may be thinned by polishing and diced, and then the film adhesive 1 may be attached, exposed and developed.
- three or more layers of semiconductor chips 12 may be stacked. In that case, at least one pair of adjacent semiconductor chips are directly bonded by the patterned adhesive layer 1 (lower layer buffer coat film).
- FIG. 20 is an end view showing another embodiment of the semiconductor device of the present invention.
- a semiconductor device 200 shown in FIG. 20 includes a support member (first adherend) 13 having a connection terminal (first connection portion: not shown) and a connection electrode portion (second connection portion: not shown).
- a semiconductor chip (second adherend) 12 an adhesive layer 1 made of an insulating material, and a conductive layer 9 made of a conductive material.
- the support member 13 has a circuit surface 18 that faces the semiconductor chip 12, and is disposed at a predetermined interval from the semiconductor chip 12.
- the adhesive layer 1 is formed in contact with each other between the support member 13 and the semiconductor chip 12 and has a predetermined pattern.
- the conductive layer 9 is formed in a portion between the support member 13 and the semiconductor chip 12 where the adhesive layer 1 is not disposed.
- the connection electrode portion of the semiconductor chip 12 is electrically connected to the connection terminal of the support member 13 through the conductive layer 9.
- FIGS. 21 to 25 are end views showing one embodiment of a method for manufacturing a semiconductor device of the present invention.
- the manufacturing method of the semiconductor device of this embodiment includes the following (first step) to (fourth step).
- (1st process) The process of providing the adhesive bond layer 1 on the supporting member 13 which has a connection terminal (FIG.21 and FIG.22).
- (Second Step) A step of patterning the adhesive layer 1 by exposure and development so as to form the opening 11 through which the connection terminal is exposed (FIGS. 23 and 24).
- (Third Step) A step of filling the opening 11 with a conductive material to form the conductive layer 9 (FIG. 25).
- the adhesive layer 1 is laminated on the circuit surface 18 of the support member 13 shown in FIG. 21 (FIG. 22).
- a laminating method a method of preparing a film-like adhesive previously formed into a film shape and sticking it to the support member 13 is simple, but using a spin coating method or the like, a photosensitive adhesive composition is used. You may laminate
- the photosensitive adhesive composition is a photosensitive adhesive that has a thermocompression bonding property to an adherend after being patterned by exposure and development and is capable of alkali development. More specifically, a resist pattern formed by patterning a photosensitive adhesive by exposure and development has thermocompression bonding properties to adherends such as semiconductor chips and substrates. For example, it is possible to bond the resist pattern and the adherend by applying pressure to the adherend while heating the resist pattern as necessary.
- the adhesive layer 1 provided on the support member 13 is irradiated with actinic rays (typically ultraviolet rays) through the mask 4 having openings formed at predetermined positions (FIG. 23). Thereby, the adhesive layer 1 is exposed in a predetermined pattern.
- actinic rays typically ultraviolet rays
- the portion of the adhesive layer 1 that has not been exposed is removed by development using an alkaline developer so that the opening 11 through which the connection terminal of the support member 13 is exposed is formed. Is patterned (FIG. 24).
- a positive photosensitive adhesive instead of the negative type, and in this case, the exposed portion of the adhesive layer 1 is removed by development.
- the conductive layer 9 is formed by filling the opening 11 of the obtained resist pattern with a conductive material (FIG. 25).
- a conductive material As a method for filling the conductive material, various methods such as gravure printing, pressing with a roll, and vacuum filling can be employed.
- the conductive material used here is a metal such as solder, gold, silver, nickel, copper, platinum, palladium or ruthenium oxide, or an electrode material made of a metal oxide, etc.
- conductive Examples include those containing at least particles and a resin component.
- conductive particles for example, conductive particles such as metals or metal oxides such as gold, silver, nickel, copper, platinum, palladium, or ruthenium oxide, or organic metal compounds are used.
- curing agent are used, for example.
- the semiconductor chip 12 is directly bonded to the adhesive layer 1 on the support member 13.
- the connection electrode portion of the semiconductor chip 12 is electrically connected to the connection terminal of the support member 13 through the conductive layer 9.
- a patterned adhesive layer (buffer coat film) may be formed on the circuit surface of the semiconductor chip 12 opposite to the adhesive layer 1.
- the semiconductor chip 12 is bonded by, for example, a method of thermocompression bonding while heating to a temperature at which the adhesive layer 1 (photosensitive adhesive composition) exhibits fluidity. After the thermocompression bonding, the adhesive layer 1 is heated as necessary to further cure.
- the semiconductor device 200 shown in FIG. 20 is obtained by the above method.
- the method for manufacturing a semiconductor device of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.
- the adhesive layer 1 is not limited to being provided on the support member 13 first, but may be provided on the semiconductor chip 12 first.
- the manufacturing method of the semiconductor device includes, for example, a first step of providing the adhesive layer 1 on the semiconductor chip 12 having the connection electrode portion, and exposing and developing the adhesive layer 1 so that the connection electrode portion is formed.
- a second step of patterning so as to form the exposed opening 11, a third step of filling the opening 11 with a conductive material to form the conductive layer 9, and a support member 13 having a connection terminal are formed on the semiconductor chip.
- the adhesive layer 1 is bonded directly to the adhesive layer 1 of the laminate of the adhesive layer 1 and the adhesive layer 1, and the connection terminal of the support member 13 and the connection electrode portion of the semiconductor chip 12 are electrically connected via the conductive layer 9. 4 steps.
- connection is made between the support member 13 and the semiconductor chip 12 that are separated into pieces, it is easy to connect the connection terminal on the support member 13 and the connection electrode portion on the semiconductor chip 12. Is preferable.
- the adhesive layer 1 can be first provided on a semiconductor wafer composed of a plurality of semiconductor chips 12.
- the semiconductor device manufacturing method includes, for example, a first step of providing the adhesive layer 1 on a semiconductor wafer including a plurality of semiconductor chips 12 having connection electrode portions, and exposing the adhesive layer 1 and A second step of patterning so as to form an opening 11 through which the connection electrode portion is exposed by development, a third step of filling the opening 11 with a conductive material to form the conductive layer 9, and connecting terminals
- a wafer-sized support member 13 (a support member having the same size as a semiconductor wafer) is directly bonded to the adhesive layer 1 side of the laminate of the semiconductor wafer and the adhesive layer 1, and the support member 13
- the semiconductor chip Isolate every two (diced) includes a fifth step.
- the adhesive layer 1 is provided on the wafer-sized support member 13 in the first step, and the semiconductor wafer is laminated with the support member 13 and the adhesive layer 1 in the fourth step. And directly connecting the connection terminal of the support member 13 to the connection electrode portion of the semiconductor chip 12 constituting the semiconductor wafer via the conductive layer 9, in the fifth step 2, the laminated body of the semiconductor wafer, the adhesive layer 1 and the support member 13 may be cut for each semiconductor chip 12.
- the process up to the connection between the semiconductor wafer and the support member 13 can be performed in the wafer size, which is preferable in terms of work efficiency.
- Another method for manufacturing a semiconductor device includes a first step of providing an adhesive layer 1 on a semiconductor wafer composed of a plurality of semiconductor chips 12 having connection electrode portions, and exposing and developing the adhesive layer 1.
- the fourth step of dicing the laminated body with the agent layer 1 for each semiconductor chip 12 and the supporting member 13 having the connection terminals are separated from the laminated body of the semiconductor chip 12 and the adhesive layer 1 that are separated into pieces.
- the adhesive layer 1 is provided on the wafer-size support member 13 in the first step, and in the fourth step, the laminate of the wafer-size support member 13 and the adhesive layer 1 is a semiconductor chip.
- the semiconductor chip 12 is directly bonded to the adhesive layer 1 side of the laminated support member 13 and the adhesive layer 1, and the support member 13 is connected.
- the terminal and the connection electrode portion of the semiconductor chip 12 may be electrically connected via the conductive layer 9.
- the above manufacturing method is preferable in that the process from the formation of the adhesive layer 1 to the conductive material filling step (third step) can be performed in a wafer size and the dicing step (fourth step) can be performed smoothly.
- a semiconductor device semiconductor laminate
- semiconductor laminate can be configured by bonding semiconductor wafers or semiconductor chips using a film adhesive. It is also possible to form a through electrode in this laminate.
- the semiconductor device manufacturing method includes, for example, a first step of providing the adhesive layer 1 made of a photosensitive adhesive on the first semiconductor chip 12 having the connection electrode portion of the through electrode, and an adhesive layer.
- a semiconductor wafer may be used instead of the semiconductor chip.
- the semiconductor device of the present invention may be a solid-state image sensor as shown in FIG.
- FIG. 26 is an end view showing an embodiment of a semiconductor device of the invention.
- a semiconductor device (solid-state imaging device) 200 shown in FIG. 26 includes a glass substrate 7, a semiconductor chip 12, an adhesive layer 1, and an effective pixel region 17. The glass substrate 7 and the semiconductor chip 12 are bonded via the patterned adhesive layer 1, and an effective pixel region 17 is formed on the surface of the semiconductor chip 12 on the support member 13 side.
- the semiconductor device (solid-state imaging device) 200 is used for manufacturing a CMOS sensor as shown in FIG.
- FIG. 27 is an end view showing an example of a CMOS sensor using the semiconductor element shown in FIG. 26 as a solid-state imaging device.
- the semiconductor device 200 is electrically connected to connection terminals (not shown) on the semiconductor element mounting support member 13 via a plurality of conductive bumps 32.
- the semiconductor device 200 is connected to the connection terminals on the semiconductor element mounting support member 13 through conductive wires. It may be.
- the CMOS sensor 300 includes a lens 38 provided so as to be located immediately above the effective pixel region 17 (opposite side of the semiconductor chip 12), and a side wall 50 provided so as to enclose the semiconductor device 200 together with the lens 38.
- a fitting member 42 interposed between the lens 38 and the side wall 50 in a state in which the lens 38 is fitted is mounted on the semiconductor element mounting support member 13.
- the semiconductor device 200 manufactured by the method as described above is connected to the connection terminals on the semiconductor element mounting support member 13 and the semiconductor chip 12 via the conductive bumps 32, and the semiconductor device 200 is included.
- the lens 38, the side wall 50, and the fitting member 42 are formed on the semiconductor element mounting support member 13.
- PI-3 In a 300 mL flask equipped with a stirrer, a thermometer, a nitrogen displacement device (nitrogen inlet pipe) and a reflux condenser equipped with a moisture acceptor, 21.96 g (0.06 mol) of BIS-AP-AF and D-400 were added. 8.66 g (0.02 mol), BY16-871EG 2.485 g (0.01 mol) and NMP 80 g as a solvent were charged and stirred to dissolve the diamine in the solvent.
- PI-4 In a 300 mL flask equipped with a stirrer, a thermometer, a nitrogen displacement device (nitrogen inlet pipe) and a reflux condenser equipped with a moisture acceptor, 21.96 g (0.06 mol) of BIS-AP-AF and D-400 were added. 8.66 g (0.02 mol) and 3.728 g (0.015 mol) of BY16-871EG and 80 g of NMP as a solvent were charged and stirred to dissolve the diamine in the solvent.
- HAB 3,3-Dihydroxy-4,4-diaminobiphenyl
- HAB 3,3-Dihydroxy-4,4-diaminobiphenyl
- ⁇ (D2) component a compound having an ethylenically unsaturated group and an epoxy group>
- 178 g (1) of a liquid high-purity bisphenol A bisglycidyl ether epoxy resin (trade name “YD-825GS”, product name “YD-825GS”, epoxy equivalent 178 g / eq) 0.0 equivalents)
- 36 g (0.5 equivalents) of acrylic acid, 0.5 g of triphenylphosphine, and 0.15 g of hydroquinone were allowed to react at 100 ° C. for 7 hours, and carbon-carbon double bonds and epoxy groups were present in the molecule.
- the compound (D2) which has this was obtained.
- (D2) was titrated with an ethanol solution of potassium hydroxide, and it was confirmed that the acid value was 0.3 KOH mg / g or less. (5% mass reduction temperature: 300 ° C)
- Photosensitive adhesive composition Imide group-containing resins (PI-1) to (PI-7) obtained above and (B) radiation-polymerizable compounds, (C) photoinitiators, (D) thermosetting components, (E) peroxides And (F) each component was blended at a composition ratio (unit: part by mass) shown in Table 1 below using the filler, and the photosensitive adhesive compositions (adhesives) of Examples 1 to 8 and Comparative Examples 1 to 6 An agent layer forming varnish) was obtained.
- PI-1 to (PI-7) obtained above and (B) radiation-polymerizable compounds, (C) photoinitiators, (D) thermosetting components, (E) peroxides And (F) each component was blended at a composition ratio (unit: part by mass) shown in Table 1 below using the filler, and the photosensitive adhesive compositions (adhesives) of Examples 1 to 8 and Comparative Examples 1 to 6 An agent layer forming varnish) was obtained.
- ⁇ Adhesive sheet> The obtained photosensitive adhesive composition was applied onto a substrate (peeling agent-treated PET film) so that the film thickness after drying was 40 ⁇ m, and heated in an oven at 80 ° C. for 20 minutes, Then, it heated at 120 degreeC for 20 minute (s), and formed the adhesive bond layer which consists of a photosensitive adhesive composition on a base material.
- the adhesive sheet which has a base material and the adhesive bond layer formed on the base material was obtained.
- the obtained sample was subjected to a 90 ° peel test at room temperature using a rheometer (manufactured by Toyo Seisakusho Co., Ltd., “Strograph ES” (trade name)) to peel the adhesive layer and the polyimide film. The strength was measured. Based on the measurement results, the sample was evaluated for stickability with a sample having a peel strength of 2 N / cm or more as A and a sample having a peel strength of less than 2 N / cm as B. The evaluation results are shown in Table 1.
- cured material layer which consists of hardened
- the laminated body composed of the obtained silicon wafer and the cured product layer was separated into pieces of 3 mm ⁇ 3 mm. After drying the separated laminate on a hot plate at 120 ° C. for 10 minutes, the laminate was laminated on a glass substrate (10 mm ⁇ 10 mm ⁇ 0.55 mm) so that the cured product layer was in contact with the glass substrate. The pressure was applied at 150 ° C. for 10 seconds while applying pressure.
- a glass substrate (10 mm ⁇ 10 mm ⁇ 0.55 mm
- the obtained sample was heated in an oven at 180 ° C. for 3 hours, and further heated on a heating plate at 260 ° C. for 10 seconds, and then a shear adhesion tester “Dage-4000” (trade name) was used. Used to measure the adhesion. The measurement results are shown in Table 1.
- a polytetrafluoroethylene (trade name “Teflon”) sheet (Teflon sheet) is placed on a support, and the adhesive sheet is roll-pressed (temperature 60 ° C., linear pressure 4 kgf / cm, feed rate 0). .5 m / min).
- the obtained laminate was exposed at 1000 mJ / cm 2 from the side of the adhesive sheet with the base material using a high precision parallel exposure machine (“EXM-1172-B- ⁇ ” (trade name) manufactured by Oak Seisakusho).
- TMAH tetramethylammonium hydride
- the obtained film is laminated by roll pressurization (temperature 100 ° C., linear pressure 4 kgf / cm, feed rate 0.5 m / min) to a thickness of 80 ⁇ m, and consists of a Teflon sheet, an adhesive layer and a Teflon sheet.
- a sample of the laminate was obtained. After the Teflon sheet on one side was peeled and removed, it was heated in an oven at 180 ° C. for 3 hours. The heated sample was cut into a strip of 5 mm width, and using a viscoelasticity analyzer “RSA-2” (trade name) manufactured by Rheometrics, the heating rate was 5 ° C./min, the frequency was 1 Hz, and the measurement temperature was ⁇ 50.
- the storage elastic modulus at 110 ° C. was obtained under the condition of ⁇ 300 ° C.
- the adhesive sheet was laminated on the silicon wafer in the same manner as the high temperature adhesiveness evaluation test.
- the obtained laminate was exposed in the same manner as in the above test from the side of the adhesive sheet with a substrate via a negative pattern mask (manufactured by Hitachi Chemical Co., Ltd., “No. G-2” (trade name)).
- TMAH tetramethylammonium hydride
- step tablet manufactured by Hitachi Chemical Co., Ltd., “Photec 41 Step Density Tablet” whose light transmission amount gradually decreases as a negative pattern photomask on a substrate (PET film).
- step tablet manufactured by Hitachi Chemical Co., Ltd., “Photec 41 Step Density Tablet” whose light transmission amount gradually decreases as a negative pattern photomask on a substrate (PET film).
- the base material PET film
- TMAH tetramethylammonium hydride
- temperature 26 ° C.
- spray pressure 0.18 MPa.
- the film was washed with pure water at a temperature of 23 ° C. under a spray pressure of 0.02 MPa.
- the photosensitivity of the adhesive sheet was evaluated by measuring the number of steps of the step tablet of the cured film formed on the silicon wafer. Based on the measurement results, A was evaluated when the number of remaining stages was 25 or more, B was evaluated when the number of remaining stages was 25 or less, and C was evaluated when pattern formation was not possible. The results are shown in Table 1.
- the measurement plate was a parallel plate having a diameter of 8 mm, and the measurement conditions were set to a temperature increase of 5 ° C./min and a frequency of 1 Hz.
- the lowest melt viscosity at 50 ° C. to 200 ° C. was defined as the minimum melt viscosity. The results are shown in Table 1.
- a glass substrate (15 mm ⁇ 40 mm ⁇ 0.55 mm) was laminated on the surface opposite to the silicon wafer of the formed adhesive pattern at 0.5 MPa. While pressurizing, pressure bonding was performed at 150 ° C. for 10 minutes to obtain a sample of a laminate including a silicon wafer, an adhesive pattern, and a glass substrate, which were laminated in this order.
- thermocompression bonding property where A was a non-bonded portion (void) of 20% or less with respect to the bonding area between the glass substrate and the adhesive pattern, and C was 20% or more.
- the evaluation results are shown in Table 1.
- the photosensitive adhesive composition of the present invention is sufficiently excellent in all points of sticking property, high-temperature adhesiveness, pattern-forming property, thermocompression bonding property, heat resistance and moisture resistance, and is used for manufacturing a high-definition semiconductor package. It is suitably used as an adhesive.
- the film adhesive or adhesive sheet of the present invention is superior in alignment accuracy when applied to an adherend or support member such as a substrate, glass, or silicon wafer, compared to the case of using a liquid resin composition.
- the resolution of patterning by exposure can be improved, and furthermore, it has low-temperature thermocompression bonding with substrates, glass, semiconductor elements and other adherends after pattern formation, and excellent heat resistance after thermosetting Therefore, it can be suitably used for applications such as protection of semiconductor elements, optical elements, solid-state imaging elements, etc., or adhesives or buffer coat applications where a fine adhesion region is required.
- SYMBOLS 1 Film adhesive (adhesive layer), 1a ... Adhesive pattern, 2 ... Cover film, 3 ... Base material, 4 ... Mask, 5 ... Composite film, 6 ... Adhesive layer, 7 ... Glass substrate, 8 ... Semiconductor wafer, 9 ... conductive layer, 11 ... opening, 12, 12a, 12b ... semiconductor element (semiconductor chip), 13 ... semiconductor element mounting support member (support member), 14, 14a, 14b ... wire, 15 ... sealing Material: 16 ... Terminal, 17 ... Effective pixel area, 18 ... Circuit surface, 20 ... Semiconductor wafer with adhesive layer, 30 ... Die bonding material, 32 ... Conductive bump, 38 ... Lens, 40 ... Dicing tape, 42 ... Insertion 50, side wall, 100, adhesive sheet, 200, semiconductor device, 300, CMOS sensor, D, dicing line.
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Abstract
Description
さらに、本発明によれば、熱圧着性及び高温接着性を有した微細パターンを提供することができ、耐リフロー性に優れた材料を提供することができる。
さらに、本発明によれば、イミド基含有樹脂を高Tg化してもパターン形成性を維持できるため、額縁状パターンを形成した際には、優れた高温接着性と気密封止性を付与した材料を提供することができる。
さらに、本発明では、貼付性(低温貼付性)、高温接着性、パターン形成性、熱圧着性(低温熱圧着性)、耐リフロー性及び気密封止性に優れたフィルム状接着剤、接着シート、接着剤パターン、接着剤層付半導体ウェハ及び半導体装置を提供することが可能となる。
式 残存揮発分(%)=[(M2-M1)/M1]×100
(工程1)半導体ウェハ8内に形成された半導体チップ(半導体素子)12の回路面18上にフィルム状接着剤(接着剤層)1を積層する工程(図13(a)及び(b))。
(工程2)半導体チップ12の回路面18上に設けられた接着剤層1を露光及び現像によってパターニングする工程(図13(c)及び図14(a))。
(工程3)半導体ウェハ8を回路面18とは反対側の面から研磨して半導体ウェハ8を薄くする工程(図14(b))。
(工程4)半導体ウェハ8をダイシングにより複数の半導体チップ12に切り分ける工程(図14(c)及び図16(a))。
(工程5)半導体チップ12をピックアップして半導体装置用の板状の支持部材(半導体素子搭載用支持部材)13にマウントする工程(図16(b)及び図17(a))。
(工程6)支持部材13にマウントされた半導体チップ12aの回路面18上でパターニングされた接着剤層1に2層目の半導体チップ12bを積層する工程(図17(b))。
(工程7)半導体チップ12a及び12bをそれぞれ外部接続端子と接続する工程(図18)。
(工程1)
図13(a)に示す半導体ウェハ8内には、ダイシングラインDによって区分された複数の半導体チップ12が形成されている。この半導体チップ12の回路面18側の面にフィルム状接着剤(接着剤層)1を積層する(図13(b))。接着剤層1を積層する方法としては、予めフィルム状に成形されたフィルム状接着剤を準備し、これを半導体ウェハ8に貼り付ける方法が簡便であるが、スピンコート法などを用いて液状の感光性接着剤組成物のワニスを半導体ウェハ8に塗布し、加熱乾燥する方法によってもよい。
接着剤層1は、露光及び現像によってパターニングされた後に被着体に対する熱圧着性を有し、アルカリ現像が可能なネガ型の感光性接着剤である。より詳細には、接着剤層1を露光及び現像によってパターニングして形成されるレジストパターン(接着剤パターン)が、半導体チップや支持部材等の被着体に対する熱圧着性を有している。例えば接着剤パターンに被着体を必要により加熱しながら圧着することにより、接着剤パターンと被着体とを接着することが可能である。
パターニングの後、半導体ウェハ8の接着剤層1とは反対側の面を研磨して、半導体ウェハ8を所定の厚さまで薄くする(図14(b))。研磨は、例えば、接着剤層1上に粘着フィルムを貼り付け、粘着フィルムによって半導体ウェハ8を研磨用の治具に固定して行う。
研磨後、半導体ウェハ8の接着剤層1とは反対側の面に、ダイボンディング材30及びダイシングテープ40を有しこれらが積層している複合フィルム5を、ダイボンディング材30が半導体ウェハ8に接する向きで貼り付ける。貼り付けは必要により加熱しながら行う。
ダイシングの後、切り分けられた半導体チップ12を、接着剤層1及びダイボンディング材30とともにピックアップし(図16(b))、支持部材13にダイボンディング材30を介してマウントする(図17(a))。
支持部材13にマウントされた半導体チップ12a上の接着剤層1上に、2層目の半導体チップ12bを積層する(図17(b))。すなわち、半導体チップ12aと、その上層に位置する半導体チップ12bとが、それらの間に介在するパターニングされた接着剤層1(バッファーコート膜)によって接着される。半導体チップ12bは、パターニングされた接着剤層1のうち開口11は塞がないような位置に接着される。なお、半導体チップ12bの回路面18上にもパターニングされた接着剤層1(バッファーコート膜)が形成されている。
その後、半導体チップ12aはそのボンディングパッドに接続されたワイヤ14aを介して支持部材13上の外部接続端子と接続され、半導体チップ12bはそのボンディングパッドに接続されたワイヤ14bを介して支持部材13上の外部接続端子と接続される。次いで、半導体チップ12a及び12bを含む積層体を封止材15によって封止することにより、半導体装置200が得られる(図18)。
(第1工程)接続端子を有する支持部材13上に接着剤層1を設ける工程(図21及び図22)。
(第2工程)接着剤層1を露光及び現像により、接続端子が露出する開口11が形成されるようにパターニングする工程(図23及び図24)。
(第3工程)開口11に導電材を充填して導電層9を形成する工程(図25)。
(第4工程)接続用電極部を有する半導体チップ12を、支持部材13と接着剤層1との積層体の接着剤層1側に接着すると共に、支持部材13の接続端子と半導体チップ12の接続用電極部とを導電層9を介して電気的に接続する工程(図20)。
(第1工程)
図21に示す支持部材13の回路面18上に、接着剤層1を積層する(図22)。積層方法としては、予めフィルム状に成形されたフィルム状接着剤を準備し、これを支持部材13に貼り付ける方法が簡便であるが、スピンコート法などを用いて、感光性接着剤組成物を含有する液状のワニスを支持部材13上に塗布し、加熱乾燥する方法によって積層してもよい。
支持部材13上に設けられた接着剤層1に対して、所定の位置に開口が形成されているマスク4を介して活性光線(典型的には紫外線)を照射する(図23)。これにより接着剤層1が所定のパターンで露光される。
(PI-1)
撹拌機、温度計、窒素置換装置(窒素流入管)及び水分受容器付きの還流冷却器を備えた300mLフラスコ内に、ジアミンである2,2-ビス(3-アミノ-4-ヒドロキシフェニル)ヘキサフルオロプロパン(商品名「BIS-AP-AF」(分子量:366、セントラル硝子社製)7.32g(0.02mol)、D-400(商品名「D-400」(分子量:433)、BASF製)を13.0g(0.03mol)、1,4-ブタンジオール ビス(3-アミノプロピル)エーテル(商品名「B-12」、東京化成製、分子量204.3)6.13g(0.03mol)、及びBY16-871EG(商品名「BY16-871EG」、東レ・ダウコーニング(株)製)を2.485g(0.01mol)と、溶媒である脱水NMP(関東化学社製、N-メチル-2-ピロリドン)80gを仕込み、撹拌してジアミンを溶媒に溶解させた。
撹拌機、温度計、窒素置換装置(窒素流入管)及び水分受容器付きの還流冷却器を備えた300mLフラスコ内に、BIS-AP-AFを14.64g(0.04mol)、D-400を17.32g(0.04mol)、及びBY16-871EGを2.485g(0.01mol)と、溶媒であるNMP80gを仕込み、撹拌してジアミンを溶媒に溶解させた。
撹拌機、温度計、窒素置換装置(窒素流入管)及び水分受容器付きの還流冷却器を備えた300mLフラスコ内に、BIS-AP-AFを21.96g(0.06mol)、D-400を8.66g(0.02mol)、及びBY16-871EG2.485g(0.01mol)と、溶媒であるNMP80gを仕込み、撹拌してジアミンを溶媒に溶解させた。
撹拌機、温度計、窒素置換装置(窒素流入管)及び水分受容器付きの還流冷却器を備えた300mLフラスコ内に、BIS-AP-AFを21.96g(0.06mol)、D-400を8.66g(0.02mol)、及びBY16-871EGを3.728g(0.015mol)と、溶媒であるNMP80gを仕込み、撹拌してジアミンを溶媒に溶解させた。
撹拌機、温度計、窒素置換装置(窒素流入管)及び水分受容器付きの還流冷却器を備えたフラスコ内に、ジアミンである3,3´-ジカルボキシ-4,4´-ジアミノジフェニルメタン(和歌山精化製、商品名「MBAA」、分子量286)5.72g(0.02mol)、「D-400」25.98g(0.06mol)、「BY16-871EG」2.48g(0.01mol)と、溶媒であるNMP110gを仕込み、撹拌してジアミンを溶媒に溶解させた。
撹拌機、温度計、窒素置換装置(窒素流入管)及び水分受容器付きの還流冷却器を備えたフラスコ内に、ジアミンである「MBAA」14.3g(0.05mol)、「D-400」12.99g(0.03mol)、及び「BY16-871EG」3.73g(0.015mol)と、溶媒であるNMP90gを仕込み、撹拌してジアミンを溶媒に溶解させた。
撹拌機、温度計、窒素置換装置(窒素流入管)及び水分受容器付きの還流冷却器を備えたフラスコ内に、ジアミンである3,3-ジヒドロキシ-4,4-ジアミノビフェニル(以下、HAB)(和歌山精化製、商品名「HAB」、分子量216)を8.64g(0.04mol)、「D-400」17.32g(0.04mol)、及び「BY16-871EG」2.48g(0.01mol)と、溶媒であるNMP80gを仕込み、撹拌してジアミンを溶媒に溶解させた。
撹拌機、温度計及び窒素置換装置を備えた500mLフラスコ内に、液状の高純度ビスフェノールAビスグリシジルエーテルエポキシ樹脂(東都化成製、商品名「YD-825GS」、エポキシ当量178g/eq)178g(1.0当量)、アクリル酸36g(0.5当量)、トリフェニルホスフィン0.5g、及びヒドロキノン0.15gを仕込み、100℃で7時間反応させ、分子内に炭素-炭素二重結合及びエポキシ基を有する化合物(D2)を得た。(D2)を水酸化カリウムのエタノール溶液で滴定し、酸価が0.3KOHmg/g以下であることを確認した。(5%質量減少温度:300℃)
上記で得られたイミド基含有樹脂(PI-1)~(PI-7)並びに(B)放射線重合性化合物、(C)光開始剤、(D)熱硬化性成分、(E)過酸化物及び(F)フィラーを用いて、下記表1に示す組成比(単位:質量部)にて各成分を配合し、実施例1~8及び比較例1~6の感光性接着剤組成物(接着剤層形成用ワニス)を得た。
(B)放射線重合性化合物
・M-313:東亜合成社製、イソシアヌル酸EO変性ジ及びトリアクリレート(5%質量減少温度:>400℃)
(C)光開始剤
・I-819:チバ・ジャパン社製、ビス(2,4,6-トリメチルベンゾイル)-フェニルフォスフィンオキサイド(5%質量減少温度:210℃、365nmでの分子吸光係数:2300ml/g・cm)、UV照射によって光退色する光開始剤
・I-OXE02:チバ・ジャパン社製、エタノン,1-[9-エチル-6-(2-メチルベンゾイル)-9H-カルバゾールー3-イル]-,1-(O-アセチルオキシム)(5%質量減少温度:370℃、365nmでの分子吸光係数:7700ml/g・cm)、上記一般式(33)で表されるオキシムエステル基含有光開始剤
(D)熱硬化性成分
(D1)エポキシ樹脂
・YDF-8170C:東都化成社製、ビスフェノールF型ビスグリシジルエーテル(5%質量減少温度:270℃)
(D2)エチレン性不飽和基及びエポキシ基を有する化合物
(D3)フェノール化合物
・TrisP-PA:本州化学社製、トリスフェノール化合物(α,α,α´-トリス(4-ヒドロキシフェノル)-1-エチル-4-イソプロピルベンゼン)(5%質量減少温度:350℃)
(E)過酸化物
・パークミルD:日油社製、ジクミルパーオキサイド
(F)フィラー
・R-972:日本アエロジル社製、疎水性フュームドシリカ(平均粒径:約16nm)
得られた感光性接着剤組成物を、乾燥後の膜厚が40μmとなるように、それぞれ基材(剥離剤処理PETフィルム)上に塗布し、オーブン中にて80℃で20分間加熱し、続いて120℃で20分間加熱して、基材上に感光性接着剤組成物からなる接着剤層を形成した。このようにして、基材及び基材上に形成された接着剤層を有する接着シートを得た。
(貼付性)
支持台上にシリコンウェハ(6インチ径、厚さ400μm)を載せ、その上に、上記接着シートを、接着剤層がシリコンウェハ(支持台と反対側の面)と接するように、ロール加圧(温度100℃、線圧4kgf/cm、送り速度0.5m/分)により積層した。基材(PETフィルム)を剥離除去した後、露出した接着剤層上に、厚み80μm、幅10mm、長さ40mmのポリイミドフィルム(宇部興産社製、「ユーピレックス」(商品名))を、上記と同様の条件でロール加圧して積層した。このようにして、シリコンウェハ、接着剤層及びポリイミドフィルムからなり、これらがこの順に積層する積層体のサンプルを得た。
ロール加圧の温度を60℃としたこと以外は上記貼付性の評価試験と同様にして、シリコンウェハ上に接着シートを積層した。得られた積層体を、基材付き接着シート側から、高精度平行露光機(オーク製作所製、「EXM-1172-B-∞」(商品名))により1000mJ/cm2で露光した。基材(PETフィルム)を剥離除去した後、コンベア現像機(ヤコー社製)を用いて、テトラメチルアンモニウムハイドライド(TMAH)2.38質量%溶液を現像液とし、温度26℃、スプレー圧0.18MPaの条件で1分間スプレー現像した後、温度25℃の純水にてスプレー圧0.02MPaの条件で6分間水洗し、120℃で1分間乾燥させた。このようにして、シリコンウェハ上に、感光性接着剤組成物の硬化物からなる硬化物層を形成した。
支持台上にポリテトラフルオロエチレン(商品名「テフロン」)のシート(テフロンシート)を載せ、その上に、上記接着シートを、ロール加圧(温度60℃、線圧4kgf/cm、送り速度0.5m/分)により積層した。得られた積層体を、基材付き接着シート側から、高精度平行露光機(オーク製作所製、「EXM-1172-B-∞」(商品名))により1000mJ/cm2で露光した。基材(PETフィルム)を剥離除去した後、コンベア現像機(ヤコー社製)を用いて、テトラメチルアンモニウムハイドライド(TMAH)2.38質量%溶液を現像液とし、温度26℃、スプレー圧0.18MPaの条件で1分間晒した後、温度25℃の純水にてスプレー圧0.02MPaの条件で6分間水洗した。得られたフィルムを厚さが80μmとなるようにロール加圧(温度100℃、線圧4kgf/cm、送り速度0.5m/分)により積層し、テフロンシート、接着剤層及びテフロンシートからなる、積層体のサンプルを得た。片側のテフロンシートを剥離除去した後、オーブン中で180℃、3時間の条件で加熱した。加熱後のサンプルを、5mm幅の短冊状に切断し、レオメトリックス社製粘弾性アナライザー「RSA-2」(商品名)を用いて、昇温速度5℃/min、周波数1Hz、測定温度-50~300℃の条件で測定し、110℃での貯蔵弾性率を得た。
上記高温接着性の評価試験と同様にして、シリコンウェハ上に接着シートを積層した。得られた積層体を、基材付き接着シート側から、ネガ型パターン用マスク(日立化成社製、「No.G-2」(商品名))を介して、上記試験と同様に露光した。次いで、上記試験と同様に、ホットプレート上で放置後、基材を除去し、2.38%質量%のテトラメチルアンモニウムハイドライド(TMAH)水溶液に5分間浸漬し、未露光部が溶解しながらパターンが形成されたものを(A)とし、未露光部がフィルム状ではく離しながらパターンが形成されたもの及びパターン形成されなかったものを(C)として評価した。
テフロンシート上に実施例1~8及び比較例1~5で得られた接着シートを、接着剤層をテフロンシート側にしてロール(温度60℃、線圧4kgf/cm、送り速度0.5m/分)で加圧することによりラミネートした。その後、高精度平行露光機で1000mJ/cm2露光した。基材(PETフィルム)を取り除き、得られたシートをコンベア現像機(ヤコー社製)を用いて、テトラメチルアンモニウムハイドライド(TMAH)2.38質量%溶液を現像液とし、温度26℃、スプレー圧0.18MPaの条件で1分間スプレー現像した後、温度25℃の純水にてスプレー圧0.02MPaの条件で3分間水洗した。80℃でラミネートして厚みが約200μmとなるように積層し、10mm×10mmの大きさに切り出した。得られたサンプルの片側のテフロンシートを剥がし、120℃で10分間加熱し、粘弾性測定装置ARES(レオメトリックス・サイエンティフィック・エフ・イー株式会社製)を用いて測定した。測定プレートは直径8mmの平行プレート、測定条件は昇温5℃/min、周波数1Hzに設定した。50℃~200℃での溶融粘度の最低値を最低溶融粘度とした。結果を表1に示す。
ロール加圧の温度を60℃とし、上記ネガ型パターン用マスクに代えて額縁状6インチサイズマスクパターン(中空部2mm、線幅0.5mm)を用いたこと以外は、上記パターン形成性の評価試験と同様にして、シリコンウェハ上に、感光性接着剤組成物の接着剤パターンを形成した。
上記熱圧着性の評価試験と同様にして、シリコンウェハ、接着剤パターン及びガラス基板からなり、これらがこの順に積層する積層体のサンプルを得た。得られたサンプルを、オーブン中で180℃、3時間の条件で加熱した。加熱後のサンプルを、温度85℃、湿度60%の条件下で168時間処理し、温度25℃、湿度50%の環境下に置いた後、250℃、10秒のIRリフローを行い、剥離の有無を顕微鏡(倍率:15倍)で観察した。剥離が見られなかったものをA、剥離が見られたものをCとして、耐リフロー性の評価を行った。評価結果を表1に示す。
上記耐リフローの評価試験と同様に、積層体のサンプルをオーブン中で180℃にて3時間加熱した。加熱後のサンプルを、加速寿命試験装置(HIRAYAMA社製、HASTEST PC-422R8)を用いて、温度110℃、湿度85%の条件下で48時間処理した後、温度が30℃になるまで装置内に静置した。その後温度25℃、湿度50%の環境に置き、サンプルのガラス内部が結露、もしくは接着剤のはく離を顕微鏡で観察した。結露及び/又ははく離が見られなかったものをA、結露及び/又ははく離が見られたものをCとして、110℃での気密封止性の評価を行った。評価結果を表1に示す。
Claims (17)
- (A)フルオロアルキル基を有するイミド基含有樹脂、(B)放射線重合性化合物、(C)光開始剤、及び(D)熱硬化性成分を含む、感光性接着剤。
- 前記(A)フルオロアルキル基を有するイミド基含有樹脂のTgが180℃以下である、請求項1記載の感光性接着剤。
- 前記(A)フルオロアルキル基を有するイミド基含有樹脂が、更にアルカリ可溶性基を有する、請求項1又は2に記載の感光性接着剤。
- 前記(A)フルオロアルキル基を有するイミド基含有樹脂が、フェノール性水酸基を有するジアミンを全ジアミンの5モル%以上含むジアミンと、テトラカルボン酸二無水物とを反応させて得られるイミド基含有樹脂である、請求項1~3のいずれか一項に記載の感光性接着剤。
- 前記(A)フルオロアルキル基を有するイミド基含有樹脂がアルカリ可溶性樹脂である、請求項1~5のいずれか一項に記載の感光性接着剤。
- 前記(D)熱硬化性成分が、(D1)エポキシ樹脂を含有する、請求項1~6のいずれか一項に記載の感光性接着剤。
- 前記(D)熱硬化性成分が、(D2)エチレン性不飽和基及びエポキシ基を有する化合物を更に含有する、請求項1~7のいずれか一項に記載の感光性接着剤。
- 前記(D)熱硬化性成分が、(D3)フェノール化合物を更に含有する、請求項1~8のいずれか一項に記載の感光性接着剤。
- (E)過酸化物を更に含む、請求項1~9のいずれか一項に記載の感光性接着剤。
- (F)フィラーを更に含む、請求項1~10のいずれか一項に記載の感光性接着剤。
- 請求項1~11のいずれか一項に記載の感光性接着剤をフィルム状に成形することにより得られる、フィルム状接着剤。
- 基材と、該基材上に形成された請求項12に記載のフィルム状接着剤からなる接着剤層と、を備える接着シート。
- 被着体上に積層された請求項12に記載のフィルム状接着剤からなる接着剤層を、露光し、露光後の前記接着剤層をアルカリ現像液により現像処理することにより得られる接着剤パターン。
- 半導体ウェハと、該半導体ウェハ上に積層された請求項12に記載のフィルム状接着剤からなる接着剤層と、を備える接着剤層付半導体ウェハ。
- 請求項1~11のいずれか一項に記載の感光性接着剤を用いて、半導体素子同士、及び/又は、半導体素子と半導体素子搭載用支持部材とが接着された構造を有する半導体装置。
- 前記半導体素子搭載用支持部材が透明基板である、請求項16に記載の半導体装置。
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JP2012215874A (ja) * | 2011-03-28 | 2012-11-08 | Hitachi Chem Co Ltd | 感光性樹脂組成物、感光性フィルム、パターン形成方法、中空構造の形成方法、及び電子部品 |
JP2012215872A (ja) * | 2011-03-28 | 2012-11-08 | Hitachi Chem Co Ltd | 感光性樹脂組成物、感光性フィルム、パターン形成方法、中空構造の形成方法、及び電子部品 |
JP2013160899A (ja) * | 2012-02-03 | 2013-08-19 | Hitachi Chemical Co Ltd | 感光性樹脂組成物、フィルム状接着剤、接着シート、接着剤パターン、接着剤層付半導体ウェハ、及び半導体装置 |
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JP2017083851A (ja) * | 2011-03-28 | 2017-05-18 | 日立化成株式会社 | 感光性樹脂組成物、感光性フィルム、パターン形成方法、中空構造の形成方法、及び電子部品 |
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JP2014187167A (ja) * | 2013-03-22 | 2014-10-02 | Toshiba Corp | 半導体装置及びその製造方法 |
JPWO2015008330A1 (ja) * | 2013-07-16 | 2017-03-02 | 日立化成株式会社 | 感光性樹脂組成物、フィルム状接着剤、接着シート、接着剤パターン、接着剤層付半導体ウェハ及び半導体装置 |
US10428253B2 (en) | 2013-07-16 | 2019-10-01 | Hitachi Chemical Company, Ltd | Photosensitive resin composition, film adhesive, adhesive sheet, adhesive pattern, semiconductor wafer with adhesive layer, and semiconductor device |
JP2015140409A (ja) * | 2014-01-29 | 2015-08-03 | 日立化成株式会社 | 接着剤組成物、接着剤組成物を用いた電子部材、及び半導体装置の製造方法 |
TWI773833B (zh) * | 2017-09-28 | 2022-08-11 | 日商東麗股份有限公司 | 感光性樹脂組成物、感光性片材暨該等之硬化膜、其製造方法、使用其之中空構造體及電子零件 |
WO2021070623A1 (ja) * | 2019-10-11 | 2021-04-15 | 積水化学工業株式会社 | 粘着剤組成物、粘着テープ、及び、電子部品の製造方法 |
JP2023015161A (ja) * | 2020-03-31 | 2023-01-31 | 住友ベークライト株式会社 | 感光性樹脂組成物、電子デバイスの製造方法および電子デバイス |
Also Published As
Publication number | Publication date |
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CN102471664A (zh) | 2012-05-23 |
JPWO2011001942A1 (ja) | 2012-12-13 |
TW201127928A (en) | 2011-08-16 |
KR20120024723A (ko) | 2012-03-14 |
JP5549671B2 (ja) | 2014-07-16 |
US20120133061A1 (en) | 2012-05-31 |
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