WO2010113759A1 - 樹脂スペーサー用フィルム、受光装置及びその製造方法、並びにmemsデバイス及びその製造方法 - Google Patents
樹脂スペーサー用フィルム、受光装置及びその製造方法、並びにmemsデバイス及びその製造方法 Download PDFInfo
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- WO2010113759A1 WO2010113759A1 PCT/JP2010/055237 JP2010055237W WO2010113759A1 WO 2010113759 A1 WO2010113759 A1 WO 2010113759A1 JP 2010055237 W JP2010055237 W JP 2010055237W WO 2010113759 A1 WO2010113759 A1 WO 2010113759A1
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- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229940079877 pyrogallol Drugs 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical compound C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 description 1
- VLCLHFYFMCKBRP-UHFFFAOYSA-N tricalcium;diborate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]B([O-])[O-].[O-]B([O-])[O-] VLCLHFYFMCKBRP-UHFFFAOYSA-N 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
Images
Classifications
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
-
- 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
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
- C09J163/10—Epoxy resins modified by unsaturated compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
- B81B7/02—Microstructural systems; Auxiliary parts of microstructural devices or systems containing distinct electrical or optical devices of particular relevance for their function, e.g. microelectro-mechanical systems [MEMS]
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0203—Containers; Encapsulations, e.g. encapsulation of photodiodes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of 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 C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- 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
Definitions
- the present invention relates to a resin spacer film, a light receiving device and a manufacturing method thereof, and a MEMS device and a manufacturing method thereof.
- the present invention particularly relates to a resin spacer film used for manufacturing a light receiving device and a MEMS device, a light receiving device using the same, a manufacturing method thereof, a MEMS device, and a manufacturing method thereof.
- Such a light receiving device is required to have a structure in which a light receiving element is contained in a sealed state in order to prevent foreign matters such as dust and dust that cause imaging failure from entering from the outside.
- a general light receiving device has a hollow package structure in which a base substrate on which a light receiving element is formed and a transparent substrate disposed opposite to the base substrate are bonded via a spacer.
- Spacers used for forming a hollow package structure have been proposed with various materials.
- resin spacers are attracting attention because they can manufacture a light receiving device with a hollow package structure at a low cost. Yes.
- Patent Document 1 discloses a method of manufacturing a light-receiving device having a hollow package structure using an adhesive film in which a photosensitive resin composition is covered with a cover film.
- the adhesive film is exposed and developed to form a resin spacer surrounding the photoelectric conversion portion of the wafer.
- the transparent substrate is adhered to the resin spacer formed on the wafer, a light receiving device having a hollow package structure in which the photoelectric conversion unit is sealed by the wafer, the resin spacer, and the transparent substrate is obtained.
- resin spacers have advantages such as low cost and light weight, so they are not only used when manufacturing light receiving devices having a hollow package structure, but are also used as spacers made of other materials in various applications. Is being replaced.
- Patent Document 2 discloses a method of manufacturing a MEMS (Micro Electro Mechanical Systems) device using a photosensitive resin film (resin spacer film).
- the photosensitive resin film is exposed and developed to produce a MEMS device having a structure in which the MEMS element is surrounded by a resin spacer. Is done.
- the resin spacer film is attached to the wafer. It may be cut in advance according to the shape.
- FIG. 12A is a plan view showing an example of a cut table for cutting the resin spacer film
- FIG. 12B is a cross-sectional view taken along line II of the cut table shown in FIG. 12A.
- FIG. 13 is sectional drawing which shows a mode that the film for resin spacers is cut using the cut table shown to FIG. 12A, 12B.
- the cut table 100 includes a stage portion 100a having an opening at the center and a film contact portion 100b provided on the stage 100a so as to surround the opening.
- the resin spacer film 102 is placed on the film contact portion 100 b of the cut table 100 and cut by a cutter 104 provided at the opening of the cut table 100.
- the inventors of the present application may have a bad influence on the subsequent film cutting accuracy because a part of the resin composition of the resin spacer film adheres to the film contact portion of the cut table during the above-described film cutting. I came to recognize that.
- the present invention has been made in view of such circumstances, a resin spacer film capable of reducing adhesion of a resin composition to a cut table during film cutting, a light receiving device using the same, and a method for manufacturing the same And a MEMS device and a manufacturing method thereof.
- One aspect of the present invention is a resin spacer film including an adhesive layer made of a resin composition and a cover film that covers the surface of the adhesive layer, and an adhesion force C 1 between the adhesive layer and the cover film; Further, the present invention relates to a resin spacer film, wherein the adhesion force D between the adhesive layer and the silicone resin satisfies a condition of C 1 > D.
- the adhesion between the adhesion C 1 between the adhesive layer and the cover film of the resin spacer film, and the adhesive layer of the resin spacer film, and a silicone resin which is a typical material of the film contact portion of the cut table D is set to satisfy the condition of C 1 > D.
- the resin composition for the film contact portion is not limited to the case where the material constituting the film contact portion of the cut table is a silicone resin. It became clear that the adhesion of can be reduced.
- adhesion strength refers to the force per unit width required to vertically peel the interface between two substances, and specifically refers to the peel strength at 25 ° C.
- the “silicone resin” used for measuring the adhesion force D is specifically a composite silicone sheet (manufactured by Nipper Corporation).
- the adhesive force E 1 between the adhesive layer and the silicon wafer preferably satisfies the condition of E 1 > 0.01 N / m.
- the adhesion force E 1 between the silicon wafer which is a typical example of the laminate target substrate resin spacer film E 1> 0.01 N / m satisfy the,
- the resin spacer film can be reliably fixed on the substrate to be laminated.
- the “silicon wafer” used for the measurement of the adhesion force E 1 is specifically a polished wafer (manufactured by SUMCO Corporation, product number PW, thickness of 725 ⁇ m).
- the adhesion E 2 between the adhesive layer and the silicon wafer was exposed under the condition of 700 mJ / cm 2 by the reference, it is preferable satisfies the condition C 2 ⁇ E 2.
- the “silicon wafer” used for the measurement of the adhesion force E 2 is specifically a polished wafer (manufactured by SUMCO Corporation, product number PW, thickness of 725 ⁇ m).
- adhesion of the resin composition to the cover film can be reduced when the cover film is peeled off after the exposure of the resin spacer film on the substrate to be laminated.
- i-line-based integrated exposure amount refers to a value obtained by integrating the illuminance of i-line light (wavelength around 365 nm) used for exposure with the exposure time.
- the cumulative exposure amount is 700 mJ / cm 2 on the basis of i-line.
- the elastic modulus of the adhesive layer after exposure under the condition that the cumulative exposure amount is 700 mJ / cm 2 on an i-line basis is preferably 100 Pa or more at a measurement temperature of 80 ° C. .
- moisture permeability of the adhesive layer which is is preferably 12g / m 2 / 24h or more.
- the moisture permeability of the adhesive layer after exposure and thermosetting is sufficiently high, so moisture in the hollow package of the light receiving device and the MEMS device can be released to the outside.
- a resin spacer that can reduce the condensation of the light receiving device or the MEMS device can be formed.
- the resin composition preferably includes an alkali-soluble resin and a photopolymerizable resin.
- the resin spacer when the resin composition constituting the adhesive layer of the resin spacer film contains a photopolymerizable resin, the resin spacer can be formed with high accuracy by a photolithography technique. Moreover, when a resin composition contains alkali-soluble resin, the image development process of the film for resin spacers can be performed using alkaline aqueous solution with small environmental impact.
- the resin composition may further contain a thermosetting resin.
- the resin composition includes a thermosetting resin in addition to the alkali-soluble resin and the photopolymerizable resin, not only can the resin spacer be excellent in heat resistance, but also after the formation of the resin spacer, Can be securely bonded by thermocompression bonding.
- the alkali-soluble resin may contain a (meth) acryl-modified novolak resin.
- the alkali-soluble resin contains a (meth) acryl-modified novolak resin
- the compatibility between the photopolymerizable resin and the thermosetting resin can be improved.
- the alkali-soluble resin may include a carboxyl group-containing polymer selected from the group consisting of a carboxyl group-containing epoxy acrylate, a carboxyl group-containing acrylic polymer, and a polyamic acid.
- the photopolymerizable resin may contain an acrylic monomer.
- a trifunctional (meth) acrylate compound or a tetrafunctional (meth) acrylate compound excellent in photopolymerizability can be suitably used.
- the photopolymerizable resin may contain a (meth) acrylic acid adduct of an epoxy compound.
- a base substrate on which a photoelectric conversion unit is formed a transparent substrate disposed to face the base substrate, and between the base substrate and the transparent substrate,
- a light receiving device including a resin spacer disposed so as to surround a photoelectric conversion unit, wherein the resin spacer is formed of the resin spacer film according to the above aspect.
- Another embodiment of the present invention includes a base substrate on which a functional unit including a MEMS element is formed, a cover substrate disposed so as to face the base substrate, and between the base substrate and the cover substrate.
- a MEMS device including a resin spacer disposed so as to surround the functional unit, wherein the resin spacer is formed of the resin spacer film according to the above aspect.
- Another aspect of the present invention includes a film-cutting process for cutting the resin spacer film according to the above aspect, and the wafer having the plurality of photoelectric conversion portions formed on the resin spacer film cut in the film cutting process.
- An adhesion process for bonding the wafer and the transparent substrate through the resin spacer formed in the development process, and the wafer and the transparent substrate bonded through the resin spacer are divided into photoelectric conversion unit units.
- the present invention relates to a method for manufacturing a light receiving device including a dividing step.
- Another aspect of the present invention is a film cutting step of cutting the resin spacer film according to the above embodiment, a laminating step of laminating the resin spacer film cut in the film cutting step on the surface of a transparent substrate, An exposure development step of exposing and developing the resin spacer film laminated on the transparent substrate so that a resin spacer is formed on the transparent substrate, and through the resin spacer formed in the exposure development step.
- a bonding step of bonding the wafer formed with a plurality of photoelectric conversion units and the transparent substrate so that the plurality of photoelectric conversion units are surrounded by the resin spacer, and the bonding through the resin spacer The present invention relates to a method of manufacturing a light receiving device including a dividing step of dividing a wafer and the transparent substrate into photoelectric conversion unit units. That.
- Another aspect of the present invention is a film cut step for cutting the resin spacer film according to the above embodiment, and the resin spacer film cut in the film cut step is formed with a functional part including a MEMS element.
- a laminating step of laminating on the surface of the wafer, an exposure developing step of exposing and developing the resin spacer film laminated on the wafer so as to form a resin spacer surrounding the functional part, and the exposure developing step The manufacturing method of the MEMS device including the adhesion
- Another aspect of the present invention is a film cutting step of cutting the resin spacer film according to the above embodiment, a laminating step of laminating the resin spacer film cut in the film cutting step on the surface of the cover substrate, An exposure and development step of exposing and developing the resin spacer film laminated on the cover substrate so that a resin spacer is formed on the cover substrate; a wafer on which a functional unit including a MEMS element is formed; and
- the present invention relates to a method for manufacturing a MEMS device, which includes a bonding step of bonding a cover substrate so that the functional portion is surrounded by the resin spacer via the resin spacer formed in the exposure and development step.
- the adhesion C 1 between the adhesive layer and the cover film of the resin spacer film, and adhesion D between the adhesive layer and the silicone resin of the resin spacer film satisfies the condition C 1> D
- FIG. 1 is a cross-sectional view showing a structural example of a resin spacer film according to the present invention.
- FIG. 2 is a sectional view showing an example of the structure of the light receiving device according to the present invention.
- FIG. 3 is a cross-sectional view showing another structural example of the light receiving device.
- FIG. 4 is a process diagram showing an example of a method for manufacturing a light receiving device according to the present invention.
- FIG. 5A is a diagram illustrating a state in which the resin spacer film is cut.
- FIG. 5B is a diagram illustrating a state in which the resin spacer film is conveyed after being cut.
- FIG. 6 is a plan view showing an example of a resin spacer formed by exposure and development processing.
- FIG. 7 is a cross-sectional view showing a structural example of a MEMS device according to the present invention.
- FIG. 8 is a process diagram showing an example of a method for manufacturing a MEMS device according to the present invention.
- FIG. 9 is a table showing the blending amounts of the resin spacer films of Examples 1 to 5 and Comparative Example 1.
- FIG. 10 is a table showing the measurement results of Examples 1 to 5 and Comparative Example 1.
- FIG. 11 is another table showing the measurement results of Examples 1 to 5 and Comparative Example 1.
- FIG. 12A is a plan view illustrating a structure example of a cut table.
- 12B is a cross-sectional view taken along line II of the cut table shown in FIG. 12A.
- FIG. 13 is a view showing a state in which the resin spacer film is cut using the cut tables shown in FIGS. 12A and 12B.
- the structure of the resin spacer film according to the present invention will be described, and then the resin composition constituting the adhesive layer of the resin spacer film will be described. Then, the light-receiving device using the said film for resin spacers, its manufacturing method, a MEMS device, and its manufacturing method are demonstrated.
- FIG. 1 is a cross-sectional view showing a structural example of a resin spacer film according to the present invention.
- the resin spacer film 10 includes an adhesive layer 12 made of a resin composition and a cover film 14 that covers one surface of the adhesive layer 12.
- the resin composition constituting the adhesive layer 12 includes an alkali-soluble resin, a photopolymerizable resin, and a thermosetting resin, thereby having alkali developability, photosensitivity, and thermosetting. It is preferable.
- the film thickness t 1 of the adhesive layer 12 is preferably set in an appropriate range according to the use of a light receiving device, a MEMS device, or the like.
- the film thickness t 1 of the adhesive layer 12 can be set in a range of 5 ⁇ m or more and 100 ⁇ m or less.
- the material constituting the cover film 14 is not particularly limited as long as it has a film characteristic (for example, breaking strength and flexibility) that can maintain the film state of the adhesive layer 12.
- a film characteristic for example, breaking strength and flexibility
- PET polyethylene terephthalate
- PP Polypropylene
- PE polyethylene
- polyester polyester and the like can be used.
- the thickness t 2 of the cover film 14 it is preferable that the strength and handling property of the resin spacer film 10 is appropriately adjusted to the extent possible compatibility.
- Resin spacer film 10 having the above structure, the adhesion C 1 between the adhesive layer 12 and the cover film 14 before the exposure, and adhesion D between the adhesive layer 12 and the silicone resin before exposure, C 1> It is set so as to satisfy the condition of D (preferably C 1 > 3D).
- the condition having the adhesive force D between the adhesive layer 12 and the silicone resin as an element is set is that a silicone resin is assumed as a standard material used as a film contact portion of a cut table. It is.
- the material constituting the film contact portion of the cut table is not limited to a silicone resin, and the film contact portion may be used for various film contact portion materials. Adhesion of the resin composition to can be reduced. In particular, when the adhesion force C 1 and the adhesion force D satisfy the condition of C 1 > 3D, adhesion of the resin composition to the film contact portion can be more reliably reduced.
- a method of adjusting the adhesive force C 1 and the adhesive force D so as to satisfy the condition of C 1 > D a method of appropriately selecting a material for the cover film and a release agent on the surface of the cover film.
- a method of appropriately adjusting the structures and blending ratios of the alkali-soluble resin, the photopolymerizable resin, and the thermosetting resin is also included.
- the adhesion force E 1 between the adhesive layer 12 before exposure and the silicon wafer as a representative example of the substrate to be laminated with the resin spacer film 10 preferably satisfies the condition of E 1 > 0.01 N / m, and E 1 More preferably, the condition of> 200 N / m is satisfied.
- the laminate target substrate resin spacer film 10 e.g., silicon wafer
- Conditions in the adhesion E 2 of the silicon wafer as a typical example of the adhesive layer 12 laminated target substrate after exposure is preferably satisfies the condition C 2 ⁇ E 2.
- the resin spacer film 10 laminated on the lamination target substrate for example, a silicon wafer
- adhesion of the resin composition to the cover film 14 can be reduced.
- wire is 100 Pa or more in the measurement temperature of 80 degreeC.
- Examples of the method for adjusting the elastic modulus of the adhesive layer 12 to 100 Pa or more include a method of appropriately adjusting the structure of the photopolymerizable resin and the structures and blending ratios of the alkali-soluble resin, the photopolymerizable resin, and the thermosetting resin. It is done.
- the moisture permeability of the adhesive layer 12 measured by the JIS Z0208 B method after exposure under conditions of 700 mJ / cm 2 on an i-line basis and further thermosetting at 180 ° C. for 2 hours. is preferably 12g / m 2 / 24h or more.
- a resin spacer capable of reducing condensation in the hollow package of the light receiving device or the MEMS device can be formed.
- the moisture permeability of the adhesive layer 12 as a method of adjusting the above 12g / m 2 / 24h, the structure of the thermosetting resin, and alkali-soluble resin, a photopolymerizable resin and a thermosetting resin the structure and compounding ratio appropriately The method of adjusting is mentioned.
- the resin composition of the adhesive layer 12 preferably contains an alkali-soluble resin, a photopolymerizable resin, and a thermosetting resin, thereby having alkali developability, photosensitivity, and thermosetting.
- the resin spacer can be formed with high accuracy by a photolithography technique. Moreover, when the resin composition which comprises the contact bonding layer 12 contains alkali-soluble resin, it can develop by using alkaline aqueous solution with a small environmental load. Further, when the resin composition constituting the adhesive layer 12 includes a thermosetting resin, not only can a resin spacer with excellent heat resistance be formed, but also after the resin spacer is formed, the resin spacer and the substrate can be bonded by thermocompression bonding. It can be securely bonded.
- alkali-soluble resin examples include, for example, carboxyl group-containing epoxy acrylate, carboxyl group-containing acrylic polymer, carboxyl group-containing polymer selected from the group consisting of polyamic acid, cresol type, phenol type, Novolak resins such as bisphenol A type, bisphenol F type, catechol type, resorcinol type, pyrogallol type, (meth) acrylic modified novolac resins such as (meth) acrylic modified bisphenol A type novolak resin, copolymers of styrene and acrylic acid , Hydroxystyrene polymers, polyvinyl phenol, poly ⁇ -methyl vinyl phenol, phenol aralkyl resins, (meth) acrylic acid resins, (meth) acrylic acid ester resins and other acrylic resins, hydroxyl groups and carbo Cyclic olefin-based resins and polyamide-based resins containing a sil group or the like (
- (meth) acryl-modified novolak resin is preferable in that it can be developed using an aqueous alkaline solution having a small environmental load and the heat resistance of the resin spacer can be improved.
- alkali-soluble resin contained in the resin composition of the adhesive layer 12 a plurality of types of alkali-soluble resins may be used in combination.
- the content of the alkali-soluble resin in the resin composition is not particularly limited, but is preferably 50 to 95% by weight of the resin composition constituting the adhesive layer 12.
- the content rate of alkali-soluble resin is less than the said lower limit, the effect which improves the compatibility of photocurable resin and thermosetting resin may not fully be acquired.
- the content rate of alkali-soluble resin is higher than the said upper limit, the developability or pattern resolution of the contact bonding layer 12 may not be enough.
- Examples of the photopolymerizable resin that can be contained in the resin composition of the adhesive layer 12 include acrylic monomers such as (meth) acrylic acid adducts of epoxy compounds and (meth) acrylate compounds.
- a polyfunctional acrylic monomer having three or more functions is preferable, and a trifunctional (meth) acrylate compound or a tetrafunctional (meth) acrylate compound is more preferable.
- a polyfunctional acrylic monomer is used, the mechanical strength of the resin spacer after exposure and development can be improved.
- trifunctional (meth) acrylate such as trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) Tetrafunctional (meth) acrylates such as acrylate and hexafunctional (meth) acrylates such as dipentaerythritol hexa (meth) acrylate can be used.
- the content of the polyfunctional acrylic monomer in the resin composition is not particularly limited, but 1 to 50% by weight of the resin composition constituting the adhesive layer 12 is used. Particularly preferred is 5% to 25% by weight.
- strength of the resin spacer after exposure and image development may not be enough.
- the content of the polyfunctional acrylic monomer exceeds the upper limit, it may be difficult to thermocompression-bond the substrate through the resin spacer.
- the above acrylic monomer and an epoxy vinyl ester resin may be used in combination.
- the epoxy vinyl ester resin is radically polymerized with the acrylic monomer at the time of exposure, the strength of the resin spacer can be further improved.
- the solubility with respect to the alkaline aqueous solution of the non-exposed part in the contact bonding layer 12 improves by use of an epoxy vinyl ester resin, the residue after image development can be reduced.
- epoxy vinyl ester resin examples include 2-hydroxy-3-phenoxypropyl acrylate, Epolite 40E methacrylic adduct, Epolite 70P acrylic acid adduct, Epolite 200P acrylic acid adduct, Epolite 80MF acrylic acid adduct, Epolite 3002 methacrylic acid addition. , Epolite 3002 acrylic acid adduct, Epolite 1600 acrylic acid adduct, bisphenol A diglycidyl ether methacrylic acid adduct, bisphenol A diglycidyl ether acrylic acid adduct, Epolite 200E acrylic acid adduct, Epolite 400E acrylic acid adduct, etc. Can be used.
- the content of the epoxy vinyl ester resin in the resin composition is not particularly limited, but is preferably 3 to 30% by weight of the resin composition constituting the adhesive layer 12, and more preferably 5 to 15% by weight. preferable.
- the content of the epoxy vinyl ester resin is less than the above lower limit value, the water absorption characteristics of the resin spacer are deteriorated, and condensation may occur in the hollow package.
- the content of the epoxy vinyl ester resin is higher than the upper limit, the solubility of the non-exposed portion of the adhesive layer 12 in the alkaline aqueous solution is not sufficient, and a residue may be generated after development.
- the content of the epoxy vinyl ester resin in the range of 5 to 15% by weight, it is possible to prevent the generation of residues after development while maintaining the water absorption characteristics of the resin spacer.
- thermosetting resin examples include novolac type phenol resins such as phenol novolak resin, cresol novolac resin, bisphenol A novolac resin, phenol resin such as resol phenol resin, and bisphenol A epoxy resin.
- Bisphenol type epoxy resin such as bisphenol F epoxy resin, novolac epoxy resin, novolac type epoxy resin such as cresol novolac epoxy resin, biphenyl type epoxy resin, stilbene type epoxy resin, triphenolmethane type epoxy resin, alkyl modified triphenolmethane type Epoxy resins, triazine core-containing epoxy resins, dicyclopentadiene-modified phenolic epoxy resins, silicone-modified epoxy resins and other epoxy resins, urea ( Resin), resin having triazine ring such as melamine resin, unsaturated polyester resin, bismaleimide resin, polyurethane resin, diallyl phthalate resin, silicone resin, resin having benzoxazine ring, cyanate ester resin, etc. It is preferable to use an epoxy resin excellent in heat resistance and adhesiveness.
- thermosetting resin an epoxy resin that is solid at room temperature (for example, bisphenol type epoxy resin) and an epoxy resin that is liquid at room temperature (for example, silicone-modified epoxy resin) are used in combination. Also good. Thereby, the characteristics (flexibility, pattern resolution, adhesiveness, etc.) required for the adhesive layer 12 can be realized with good balance while maintaining the heat resistance of the resin spacer.
- an epoxy resin that is solid at room temperature for example, bisphenol type epoxy resin
- an epoxy resin that is liquid at room temperature for example, silicone-modified epoxy resin
- the content of the thermosetting resin in the resin composition is not particularly limited, but is preferably 10 to 40% by weight, and preferably 15 to 35% by weight of the entire resin composition constituting the adhesive layer 12. Further preferred. When the content rate of a thermosetting resin is less than the said lower limit, the heat resistance of a resin spacer may not be enough. On the other hand, when the content of the thermosetting resin is higher than the upper limit, the toughness of the adhesive layer 12 may not be sufficient.
- the alkali-soluble resin, the photopolymerizable resin, and the thermosetting resin have been described as the main components constituting the resin composition of the adhesive layer 12, but the resin composition of the adhesive layer 12 is not limited to these components. Various additives may be contained.
- a photopolymerization initiator may be added to the resin composition for the purpose of improving the pattern resolution of the adhesive layer 12.
- photopolymerization initiator examples include benzophenone, acetophenone, benzoin, benzoin isobutyl ether, methyl benzoin benzoate, benzoin benzoic acid, benzoin methyl ether, benzylfinyl sulfide, benzyl, dibenzyl, and diacetyl.
- the content of the photopolymerization initiator in the resin composition is not particularly limited, but is preferably 0.5 to 5% by weight, more preferably 1 to 3% by weight, based on the entire photosensitive resin composition. preferable. If the content of the photopolymerization initiator is less than the lower limit, the effect of initiating the photopolymerization reaction may not be sufficient. If the content of the photopolymerization initiator exceeds the upper limit, the resin spacer film 10 is stored. May decrease, or the pattern resolution of the adhesive layer 12 may decrease.
- an alkali development aid may be added to the resin composition.
- alkali developing aid examples include phenol novolak resins, phenol aralkyl resins having a phenylene skeleton, trisphenylmethane type phenol resins, biphenyl aralkyl type phenol resins, ⁇ -naphthol aralkyl type phenol resins, ⁇ -naphthol aralkyl type phenol resins, and the like.
- a phenol resin is mentioned. Of these, phenol novolac resins are preferred. Thereby, it is possible to perform development processing using an alkaline aqueous solution without generating a residue.
- the content of the alkali developing aid in the resin composition is not particularly limited, but is preferably 1 to 20% by weight of the entire resin composition of the adhesive layer 12, and more preferably 2 to 10% by weight. preferable. By setting the content of the alkali developing aid within the above range, the alkali developing property can be improved without impairing other characteristics.
- an inorganic filler may be added to the resin composition for the purpose of improving characteristics such as heat resistance, dimensional stability, and moisture resistance.
- inorganic fillers examples include silicates such as talc, calcined clay, unfired clay, mica, and glass, titanium oxide, alumina, fused silica (fused spherical silica, fused crushed silica), crystalline silica, and the like.
- the content of the inorganic filler in the resin composition is preferably 5% by weight or less from the viewpoint of reducing the residue after the patterning process.
- the shape of the inorganic filler is not particularly limited, but it is preferably a true sphere, whereby the resin spacer film 10 having no anisotropy in characteristics can be obtained.
- the average particle size of the inorganic filler is not particularly limited, but is preferably 5 to 50 nm, and particularly preferably 10 to 30 nm.
- the strength of the resin spacer may not be sufficient due to the presence of the aggregate of inorganic filler in the resin spacer.
- the average particle diameter of the inorganic filler is larger than the above upper limit value, the pattern of the adhesive layer 12 is not sufficient as a result of the radiation irradiated to the adhesive layer 12 during exposure being scattered by the inorganic filler. Sometimes.
- a plastic resin e.g., ethylene glycol dimethacrylate copolymer, polymethyl methacrylate copolymer, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polymethyl methacrylate, polystyrenethacrylate, polystyrenethacrylate, polystyrenethacrylate
- FIG. 2 is a cross-sectional view showing a structural example of a light receiving device according to the present invention.
- the light receiving device 20 mainly includes a base substrate 22 on which a photoelectric conversion unit 22a is formed, a transparent substrate 24 disposed so as to face the base substrate 22, and the base substrate 22 and the transparent substrate 24. And a resin spacer 26 disposed so as to surround the photoelectric conversion portion 22a.
- the base substrate 22 is a substrate made of single crystal silicon or the like, and a photoelectric conversion portion 22 a is formed on the surface of the base substrate 22.
- the photoelectric conversion unit 22a includes a CCD (Charge Coupled Device) circuit, a CMOS (Complementary Metal Oxide Semiconductor) circuit, and the like.
- a light receiving unit 28 made of a microlens array is formed on the photoelectric conversion unit 22a of the base substrate 22.
- the resin spacer 26 surrounding the photoelectric conversion portion 22a of the base substrate 22 is a resin spacer formed using the above-described resin spacer film 10 (see FIG. 1).
- the transparent substrate 24 arranged to face the base substrate 22 is a transparent substrate made of, for example, acrylic resin, polyethylene terephthalate resin (PET), or glass.
- the light receiving device 20 having such a configuration can be used as a solid-state imaging device.
- light that has entered the light receiving device 20 through the transparent substrate 24 is received by the light receiving unit 28 and converted into an electrical signal by the photoelectric conversion unit 22 a of the base substrate 22.
- the electrical signal converted by the photoelectric conversion unit 22a is converted into imaging data by predetermined signal processing.
- the above-described light receiving device 20 has few imaging defects due to condensation due to the characteristics of the resin spacer film 10 used to form the resin spacer 26 for the following reason.
- the moisture permeability of the adhesive layer after exposure and thermosetting is 12 g / m 2 / 24h or more. Therefore, when the humidity in the hollow package of the light receiving device 20 is higher than the outside, moisture in the hollow package is discharged through the resin spacer 26, so that condensation in the hollow package of the light receiving device 20 is prevented.
- FIG. 2 shows an example in which the light receiving unit 28 formed of a microlens array is formed only on the photoelectric conversion unit 22a of the base substrate 22.
- the lens array may be formed over the entire surface of the base substrate 22.
- FIG. 3 is a cross-sectional view showing a structural example of a light receiving device in which a microlens array is formed on the entire surface of a base substrate.
- a microlens array 29 is formed over the entire surface of the base substrate 22, and only the region surrounded by the resin spacer 26 in the microlens array 29 functions as a light receiving unit. Since the other configuration is common to the structural example of the light receiving device shown in FIG. 2, the description thereof is omitted here.
- FIG. 4 is a process diagram showing an example of a method for manufacturing a light receiving device.
- a microlens array 29 is formed on the surface of a silicon wafer 30 on which a plurality of photoelectric conversion portions 22a are formed.
- microlens array 29 is formed over the entire surface of the silicon wafer 30 .
- the microlens array 29 may be selectively formed only on the photoelectric conversion portion 22a of the silicon wafer 30. .
- the resin spacer film 10 is cut in accordance with the shape of the silicon wafer 30.
- the resin spacer film 10 can be cut by any method.
- the resin spacer film 10 may be placed on the film contact portion 100 b of the cut table 100 and cut by a cutter 104 provided at the opening of the cut table 100.
- the resin spacer film 10 is cut in a state where the resin spacer film 10 is pressed from the cover film 14 side using the cut auxiliary member 106. May be performed.
- the resin spacer film 10 it is preferable to cut the resin spacer film 10 to a half cut up to about half in the thickness direction of the cover film 14 by adjusting the amount of insertion of the cutter 104.
- the entire resin spacer film 10 is conveyed in the direction of arrow A, so that the half-cut portion of the resin spacer film 10 is positioned on the silicon wafer 30 that is the substrate to be laminated. Can be moved easily.
- the resin spacer film 10 is transported in a state where the resin spacer film 10 is isolated from the film contact portion 100b by the upward movement of the cut assisting member 106 (the direction of arrow B in FIG. 5B). After the transport of the resin spacer film 10, the cut assisting member 106 moves downward (in the direction opposite to the arrow B), returns to the state shown in FIG. 5A, and the resin spacer film 10 is repeatedly cut.
- the resin spacer film 10 is set so that the adhesive force C 1 between the adhesive layer 12 and the cover film 14 and the adhesive force D between the adhesive layer 12 and the silicone resin satisfy the condition of C 1 > D. Therefore, adhesion of the resin composition with respect to the film contact part 100b at the time of the above-mentioned film cut can be reduced.
- the resin spacer film 10 cut in accordance with the shape of the silicon wafer 30 is laminated on the microlens array 29 formed on the silicon wafer 30.
- a resin spacer 26 surrounding the photoelectric conversion portion 22 a is formed on the microlens 29 as shown in FIG. Specifically, the exposure process and the development process of the adhesive layer 12 are performed as follows.
- radiation for example, ultraviolet rays
- the cover film 14 is peeled off from the adhesive layer 12, and the adhesive layer 12 is developed with a developer such as an alkaline aqueous solution, thereby removing the non-exposed portion (the portion where the radiation is not irradiated) of the adhesive layer 12. Remove.
- a resin spacer 26 surrounding the photoelectric conversion portion 22a is formed.
- the transparent substrate 24 is bonded to the silicon wafer 30 via the resin spacer 26.
- the transparent substrate 24 and the silicon wafer 30 may be bonded only by heating or pressurization, or may be bonded by pressurization and heating.
- the silicon wafer 30 is diced from the side opposite to the transparent substrate 24 to form grooves 32 at positions corresponding to the resin spacers 26.
- the silicon wafer 30 and the transparent substrate 24 are divided into units of photoelectric conversion units 22a, whereby the light receiving device 20 shown in FIG. 4F is obtained.
- a metal film is formed on the side surfaces of the grooves 32 and the bottom surface of the silicon wafer 30 by an electrical insulating layer such as a silicon oxide film or sputtering.
- This metal film functions as a signal transmission path for transmitting an electrical signal output from the photoelectric conversion unit 22a to the external substrate side when the light receiving device 20 is mounted on the external substrate via a solder bump or the like.
- FIG. 4 shows an example in which the resin spacer 26 is formed on the silicon wafer 30 side, but the present invention is not limited to this, and the resin spacer 26 may be formed on the transparent substrate 24 side.
- the resin spacer film 10 is laminated on the transparent substrate 24, and an exposure process and a development process are performed to form the resin spacer 26 on the transparent substrate 24.
- the transparent substrate 24 and the silicon wafer 30 are aligned so that the photoelectric conversion part 22a of the silicon wafer 30 is surrounded by the resin spacer 26, the transparent substrate 24 and the silicon wafer 30 are interposed via the resin spacer 26.
- Glue similarly to the method shown in FIGS. 4E and 4F, the transparent substrate 24 and the silicon wafer 30 bonded via the resin spacer 26 are divided into units of photoelectric conversion portions 22a.
- FIG. 7 is a cross-sectional view showing a structural example of a MEMS device according to the present invention.
- the MEMS device 40 mainly includes a base substrate 44 on which a functional unit 42 is formed, a cover substrate 46 disposed so as to face the base substrate 44, a base substrate 44, and a cover substrate 46.
- the resin spacer 26 is disposed so as to surround the functional unit 42.
- the base substrate 44 is a substrate made of single crystal silicon or the like, and a functional unit 42 including a MEMS element such as a pressure sensor or an acceleration sensor is formed on the base substrate 44.
- the resin spacer 26 surrounding the functional part 42 on the base substrate 44 is a resin spacer formed using the above-described resin spacer film 10 (see FIG. 1).
- the cover substrate 46 facing the base substrate 44 is a substrate made of, for example, acrylic resin, polyethylene terephthalate resin (PET), glass, single crystal silicon, or the like.
- the MEMS device having the hollow package structure in which the functional unit 42 including the MEMS element is surrounded by the resin spacer 26 has been described.
- the present invention is not limited to this, and the printer head, optical
- the present invention is also applicable to various MEMS devices including resin spacers such as scanners and flow path modules.
- FIG. 8 is a process diagram showing an example of a method for manufacturing a MEMS device.
- a silicon wafer 50 on which a plurality of functional units 42 including MEMS elements are formed is prepared. Further, the above-described resin spacer film 10 is cut in accordance with the shape of the silicon wafer 50. The cutting of the resin spacer film 10 may be performed by the same method as the manufacturing method of the light receiving device already described.
- the resin spacer film 10 cut according to the shape of the silicon wafer 50 is laminated on the silicon wafer 50.
- the resin spacer 26 surrounding the functional portion 42 is formed on the silicon wafer 50 as shown in FIG.
- the exposure process and the development process of the adhesive layer 12 may be performed by a method similar to the manufacturing method of the light receiving device already described.
- the cover substrate 46 is bonded to the silicon wafer 50 through the resin spacer 26.
- the cover substrate 46 and the silicon wafer 50 may be bonded only by heating or pressurization, or may be bonded by pressurization and heating.
- the silicon wafer 50 is diced from the side opposite to the cover substrate 46 to form a groove 52 at a position corresponding to the resin spacer 26.
- the MEMS device 40 shown in FIG. 8F is obtained by making a cut with a dicing saw from the cover substrate 46 side and dividing the silicon wafer 50 and the cover substrate 46 into functional unit units.
- Example 1 Synthesis of alkali-soluble resin (methacryloyl-modified novolak type bisphenol A resin) 500 g of a 60% MEK (methyl ethyl ketone) solution of a novolak type bisphenol A resin (Phenolite LF-4871, manufactured by Dainippon Ink Chemical Co., Ltd.) in a 2 L flask Into this, 1.5 g of tributylamine as a catalyst and 0.15 g of hydroquinone as a polymerization inhibitor were added and heated to 100 ° C.
- a 60% MEK methyl ethyl ketone
- the glycidyl methacrylate 180.9g was dripped in 30 minutes in it, and the methacryloyl modified novolak-type bisphenol A resin MPN001 (methacryloyl modification rate 50%) of solid content 74% was obtained by making it stir-react at 100 degreeC for 5 hours. .
- Resin Spacer Film Resin varnish is applied to a supporting base polyester film (MRX50, 50 ⁇ m thickness, manufactured by Mitsubishi Plastics) with a comma coater, dried at 80 ° C. for 20 minutes, and a resin having an adhesive layer with a thickness of 50 ⁇ m A film for spacers was obtained.
- MRX50 50 ⁇ m thickness, manufactured by Mitsubishi Plastics
- Example 2 Example 1 was the same as Example 1 except that the composition of the resin varnish of Example 1 was as follows. The blending amount of trimethylolpropane trimethacrylate was 20% by weight, the blending amount of bisphenol A type epoxy resin was 20% by weight, and the blending amount of (meth) acryl-modified bis A novolac resin was 45% by weight.
- Example 3 Example 1 was the same as Example 1 except that the composition of the resin varnish of Example 1 was as follows. The blending amount of trimethylolpropane trimethacrylate was 20% by weight, the blending amount of bisphenol A type epoxy resin was 25% by weight, and the blending amount of (meth) acryl-modified bis A novolac resin was 40% by weight.
- Example 4 Example 1 was the same as Example 1 except that the composition of the resin varnish of Example 1 was as follows. 20% by weight of trimethylolpropane trimethacrylate, 20% by weight of bisphenol A epoxy resin, 5% by weight of bisphenol A type epoxy resin (EOCN-1020-70, manufactured by Nippon Kayaku Co., Ltd.) The blending amount of the (meth) acryl-modified bis A novolak resin was 45% by weight.
- Example 1 was the same as Example 1 except that the composition of the resin varnish of Example 1 was as follows. Epoxy ester (manufactured by Kyoeisha Chemical Co., Ltd., epoxy ester 3002M) 1% by weight, trimethylolpropane trimethacrylate 5% by weight, bisphenol A type epoxy resin 8% by weight, cresol novolac type epoxy resin ( Nippon Kayaku Co., Ltd. product, EOCN-1020-70) was 25% by weight, and (meth) acryl-modified bis A novolak resin was added at 56% by weight.
- Epoxy ester manufactured by Kyoeisha Chemical Co., Ltd., epoxy ester 3002M
- trimethylolpropane trimethacrylate 5% by weight
- bisphenol A type epoxy resin 8% by weight
- cresol novolac type epoxy resin Nippon Kayaku Co., Ltd. product, EOCN-1020-70
- (meth) acryl-modified bis A novolak resin was added at 56% by weight.
- Comparative Example 1 In addition to the above Examples, Comparative Example 1 in which the blending amount of the resin varnish was changed was set.
- the resin spacer films obtained in Examples 1 to 5 and Comparative Example 1 were cut to a width of 18 mm, and the cover film side was fixed to a glass epoxy substrate with double-sided tape, and then the cumulative exposure amount was 700 mJ / cm 2. Under the conditions, exposure was performed with light having a wavelength of 365 nm. Further, using a rubber roller, Cellotape (registered trademark) (width 18 mm, manufactured by Mitsubishi Uny Co., Ltd.) was strongly laminated on the adhesive layer so as not to contain air bubbles.
- Cellotape registered trademark
- the cello tape (registered trademark) was pulled in the 180 ° direction under the condition of a pulling speed of 1000 mm / min, and the adhesion force C 2 (N / m) was measured.
- the measurement results are shown in the table of FIG.
- the resin spacer films obtained in Examples 1 to 5 and Comparative Example 1 were cut into a width of 36 mm, and the adhesive layer side was overlaid on a silicone resin sheet (manufactured by Nipper Co., Ltd., composite functional silicone sheet). It was. In this state, the adhesive layer side of the resin spacer film was laminated on the silicone resin sheet by utilizing the weight of the rubber roller (roll weight: 400 g, roll width: 16.5 cm). The silicone resin sheet with the adhesive layer thus obtained was used as an evaluation sample for measuring the adhesive force D between the adhesive layer and the silicone resin before exposure.
- the prepared sample for evaluation was pulled by a tensile tester in the 180 ° direction under the condition of a pulling speed of 1000 mm / min, and the adhesion force D (N / m) was measured.
- the measurement results are shown in the table of FIG.
- the resin spacer films obtained in Examples 1 to 5 and Comparative Example 1 were used. It was laminated on an 8-inch silicon wafer (manufactured by SUMCO, product number: PW, 725 ⁇ m thickness). Thus the silicon wafer with the adhesive layer obtained was an evaluation sample for measuring adhesive strength E 1 between the adhesive layer and the silicon wafer before exposure.
- the silicon wafer with the adhesive layer exposed by light with a wavelength of 365 nm under the condition of an integrated exposure amount of 700 mJ / cm 2 is the adhesion force E 2 between the adhesive layer and the silicon wafer after exposure. It was set as the sample for evaluation for measuring.
- Defective There is a resin deposit that can be visually observed on the cut stage.
- the silicon wafer on which the resin spacer film was laminated was visually observed, and the temporary fixing property to the lamination target substrate was evaluated according to the following criteria. The evaluation results are shown in the table of FIG.
- the film is not peeled over the entire surface of the silicon wafer.
- the film is partly peeled off at the end face of the silicon wafer.
- the cover film peeled from the adhesive layer was visually observed, and the peelability of the cover film was evaluated according to the following criteria. The evaluation results are shown in the table of FIG.
- roller laminator roll temperature: 60 ° C., speed: 0.3 m / min, syringe pressure
- base substrate manufactured by SUMCO Corporation, product number: PW, 725 ⁇ m thickness
- 2.0 kgf / cm 2 a silicon wafer with a resin spacer film.
- the mask of the exposure apparatus and the silicon wafer were aligned with light having a wavelength of 600 nm.
- the cover film was peeled off from the adhesive layer.
- the adhesive layer was developed (pressure: 0.3 MPa, time: 90 seconds) and had a 5 mm square opening and a width of 0.6 mm. Resin spacers were formed.
- the silicon wafer on which the resin spacer is formed and the 8-inch transparent substrate are set on the substrate bonder (SB8e, manufactured by SUSS Microtec Co., Ltd.), and the silicon wafer and the 8-inch transparent substrate are pressure-bonded. Further, post-cure was performed at 150 ° C. for 90 minutes. The obtained adhesive material between the silicon wafer and the 8-inch transparent substrate was diced into a predetermined size using a dicing saw to obtain a light receiving device as an evaluation sample.
- the substrate bonder SB8e, manufactured by SUSS Microtec Co., Ltd.
- the resin spacer of the evaluation sample was visually observed, and the flowability (crushing condition) of the resin spacer was evaluated according to the following criteria.
- the evaluation results are shown in the table of FIG.
- the sample for evaluation was allowed to stand for 168 hours under conditions of a temperature of 85 ° C. and a humidity of 85%, and then exposed to an environment of a temperature of 25 ° C. and a humidity of 50%. Was observed. Then, according to the following criteria, the presence or absence of condensation in the hollow package was evaluated. The evaluation results are shown in the table of FIG.
- the sample for evaluation was allowed to stand for 168 hours under conditions of a temperature of 85 ° C. and a humidity of 85%, and after performing solder reflow treatment at 260 ° C. three times, the sample for evaluation was observed with a microscope. And the reliability as a light-receiving device was evaluated according to the following criteria.
- Defective delamination or chip cracking has occurred.
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Abstract
Description
図1は、本発明に係る樹脂スペーサー用フィルムの構造例を示す断面図である。
次に、樹脂スペーサー用フィルム10の接着層12を構成する樹脂組成物について説明する。
次に、上述の樹脂スペーサー用フィルムを用いて製造される受光装置について説明する。
次に、上述の構成を有する受光装置の製造方法について説明する。
次に、上述の樹脂スペーサー用フィルムを用いて製造されるMEMSデバイスについて説明する。
次に、上述の構成を有するMEMSデバイスの製造方法について説明する。
1.アルカリ可溶性樹脂(メタクリロイル変性ノボラック型ビスフェノールA樹脂)の合成
ノボラック型ビスフェノールA樹脂(フェノライトLF-4871、大日本インキ化学(株)製)の固形分60%MEK(メチルエチルケトン)溶液500gを、2Lフラスコ中に投入し、これに触媒としてトリブチルアミン1.5g、および重合禁止剤としてハイドロキノン0.15gを添加し、100℃に加温した。その中へ、グリシジルメタクリレート180.9gを30分間で滴下し、100℃で5時間攪拌反応させることにより、固形分74%のメタクリロイル変性ノボラック型ビスフェノールA樹脂MPN001(メタクリロイル変性率50%)を得た。
アルカリ可溶性樹脂として、上述のメタクリロイル変性ノボラック型ビスフェノールA樹脂MPN001(MPN001)を60重量%、熱硬化性樹脂としてエポキシ樹脂として、ビスフェノールA型エポキシ樹脂(ジャパンエポキシレジン(株)製、EP-1001)10重量%、クレゾールノボラック型エポキシ樹脂(日本化薬(株)製、EOCN-1020-70)を5重量%、光重合性樹脂として、エポキシエステル(共栄社化学(株)製、エポキシエステル3002M)5重量%、トリメチロールプロパントリメタクリレート(共栄社化学(株)製、ライトエステルTMP)15重量%、光重合開始剤(チバ・スペシャリティ・ケミカルズ(株)製、イルガキュア651)2重量%、フェノールノボラック樹脂(住友ベークライト(株)、PR53647)3重量%を秤量し、ディスパーザーを用い、回転数3000rpmで1時間攪拌し、樹脂ワニスを調製した。
樹脂ワニスをコンマコーターで支持基材ポリエステルフィルム(三菱樹脂社製、MRX50、厚さ50μm)に塗布し、80℃、20分乾燥して膜厚50μmの接着層を有する樹脂スペーサー用フィルムを得た。
実施例1の樹脂ワニスの配合を以下のようにした以外は、実施例1と同様にした。トリメチロールプロパントリメタクリレートの配合量を20重量%、ビスフェノールA型エポキシ樹脂の配合量を20重量%、(メタ)アクリル変性ビスAノボラック樹脂の配合量を45重量%とした。
実施例1の樹脂ワニスの配合を以下のようにした以外は、実施例1と同様にした。トリメチロールプロパントリメタクリレートの配合量を20重量%、ビスフェノールA型エポキシ樹脂の配合量を25重量%、(メタ)アクリル変性ビスAノボラック樹脂の配合量を40重量%とした。
実施例1の樹脂ワニスの配合を以下のようにした以外は、実施例1と同様にした。トリメチロールプロパントリメタクリレートの配合量を20重量%、ビスフェノールA型エポキシ樹脂の配合量を5重量%、クレゾールノボラック型エポキシ樹脂(日本化薬(株)製、EOCN-1020-70)を20重量%、(メタ)アクリル変性ビスAノボラック樹脂の配合量を45重量%とした。
実施例1の樹脂ワニスの配合を以下のようにした以外は、実施例1と同様にした。エポキシエステル(共栄社化学(株)製、エポキシエステル3002M)1重量%、トリメチロールプロパントリメタクリレートの配合量を5重量%、ビスフェノールA型エポキシ樹脂の配合量を8重量%、クレゾールノボラック型エポキシ樹脂(日本化薬(株)製、EOCN-1020-70)を25重量%、(メタ)アクリル変性ビスAノボラック樹脂の配合量を56重量%とした。
上記実施例に加え、樹脂ワニスの配合量を変化させた比較例1を設定した。
上述のようにして得られた樹脂スペーサー用フィルムを用いて、フィルムカット時の樹脂付着性、ラミネート対象基板への仮固定性及びカバーフィルムの剥離性について評価を行った。
実施例1~5及び比較例1で得られた樹脂スペーサー用フィルムを幅18mmにカットして、カバーフィルム側をガラスエポキシ基板に両面テープで固定した。さらにゴムローラーを用いて、セロテープ(登録商標)(幅18mm、三菱ユニー製)を、気泡が入らないよう強く接着層にラミネートした。引張り試験機により、180°方向に、引張り速度1000mm/minの条件下でセロテープ(登録商標)を引張り、密着力C1(N/m)を測定した。測定結果を図10の表に示す。
実施例1~5及び比較例1で得られた樹脂スペーサー用フィルムを、フィルムラミネータ(タカトリ製Team100)により、シリコンウエハの直径より1mm小さい形状に合わせてカットした。フィルムカット後に、カットステージを目視により観察して、カットステージに対する樹脂付着性を以下の基準に従って評価した。評価結果を図10の表に示す。
実施例1~5及び比較例1で得られた樹脂スペーサー用フィルムを、ロールラミネーター(ロール温度:60℃、速度:0.3m/分、シリンジ圧:2.0kgf/cm2)を用いて、8インチシリコンウエハ(SUMCO社製、品番:PW、725μm厚)にラミネートした。
実施例1~5及び比較例1で得られた樹脂スペーサー用フィルムを、ロールラミネーター(ロール温度:60℃、速度:0.3m/分、シリンジ圧:2.0kgf/cm2)を用いて、シリコンウエハ(SUMCO社製、品番:PW、725μm厚)にラミネートした。次いで、シリコンウエハ上の樹脂スペーサー用フィルムに対して、積算露光量が700mJ/cm2の条件で波長365nmの光により露光を行った後、接着層からカバーフィルムを剥離した。
不良:カバーフィルム上に、目視で観察可能な樹脂付着物がある場合、シリコンウエハ上の接着層に浮きや剥離が観察される。
上述の樹脂スペーサー用フィルムに関して、以下のように、樹脂スペーサー特性の評価を行った。
実施例1~5及び比較例1で得られた樹脂スペーサー用フィルムに対して、積算露光量が700mJ/cm2の条件で波長365nmの光により露光を行った。次いで、樹脂スペーサー用フィルムの接着層からカバーフィルムを剥がし、接着層を3枚重ねて、動的粘弾性測定装置Rheo Stress RS150(HAAKE社製、測定周波数:1Hz、ギャップ間隔:100μm、測定温度範囲:25~200℃、昇温速度10℃/分)で貯蔵弾性率G´を測定し、80℃における弾性率を求めた。測定結果を図11の表に示す。
60℃に設定されたラミネータを用いて、樹脂スペーサー用フィルムを貼り合せ、膜厚100μmの接着層を作製し、積算露光量が700mJ/cm2の条件で波長365nmの光により当該接着層を露光した後、さらに180℃/2時間の条件で当該接着層を熱硬化した。得られた露光及び熱硬化後の接着層を透湿カップ法(JIS Z0208)に準じて、40℃/90%の環境下で評価し、透湿率を測定した。測定結果を図11の表に示す。
以下の手順で、樹脂スペーサー特性を評価するための評価用サンプルを作製した。
Claims (18)
- 樹脂組成物からなる接着層と、
前記接着層の表面を覆うカバーフィルムとを含む樹脂スペーサー用フィルムであって、
前記接着層と前記カバーフィルムとの密着力C1と、前記接着層とシリコーン樹脂との密着力Dとが、C1>Dの条件を満たすことを特徴とする樹脂スペーサー用フィルム。 - 前記接着層とシリコンウエハとの密着力E1が、E1>0.01N/mの条件を満たす請求項1に記載の樹脂スペーサー用フィルム。
- 積算露光量がi線基準で700mJ/cm2の条件で露光した後の前記接着層と前記カバーフィルムとの密着力C2と、積算露光量がi線基準で700mJ/cm2の条件で露光した後の前記接着層とシリコンウエハとの密着力E2とが、C2<E2の条件を満たす請求項1又は2に記載の樹脂スペーサー用フィルム。
- 積算露光量がi線基準で700mJ/cm2の条件で露光した後の前記接着層の弾性率が、測定温度80℃において、100Pa以上である請求項1乃至3のいずれか一項に記載の樹脂スペーサー用フィルム。
- 積算露光量がi線基準で700mJ/cm2の条件で露光して、さらに180℃、2時間の条件で熱硬化した後における、JIS Z0208 B法で測定した前記接着層の透湿率が、12g/m2/24h以上である請求項1乃至4のいずれか一項に記載の樹脂スペーサー用フィルム。
- 前記樹脂組成物は、アルカリ可溶性樹脂と光重合性樹脂とを含むことを特徴とする請求項1乃至5のいずれか一項に記載の樹脂スペーサー用フィルム。
- 前記樹脂組成物は、さらに、熱硬化性樹脂を含むことを特徴とする請求項6に記載の樹脂スペーサー用フィルム。
- 前記アルカリ可溶性樹脂は、(メタ)アクリル変性ノボラック樹脂を含むことを特徴とする請求項6又は7に記載の樹脂スペーサー用フィルム。
- 前記アルカリ可溶性樹脂は、カルボキシル基含有エポキシアクリレート、カルボキシル基含有アクリルポリマー、ポリアミド酸からなる群より選択されるカルボキシル基含有ポリマーを含むことを特徴とする請求項6乃至8のいずれか一項に記載の樹脂スペーサー用
- 前記光重合性樹脂は、アクリル系モノマーを含むことを特徴とする請求項6乃至9のいずれか一項に記載の樹脂スペーサー用フィルム。
- 前記アクリル系モノマーは、三官能(メタ)アクリレート化合物または四官能(メタ)アクリレート化合物である請求項10に記載の樹脂スペーサー用フィルム。
- 前記光重合性樹脂は、エポキシ化合物の(メタ)アクリル酸付加物を含むことを特徴とする請求項6乃至11のいずれか一項に記載の樹脂スペーサー用フィルム。
- 光電変換部が形成されたベース基板と、
前記ベース基板に対向するように配置される透明基板と、
前記ベース基板と前記透明基板との間に、前記光電変換部を囲むように配置される樹脂スペーサーとを含む受光装置であって、
前記樹脂スペーサーは、請求項1乃至12のいずれか一項に記載の樹脂スペーサー用フィルムにより形成されることを特徴とする受光装置。 - MEMS素子を含む機能部が形成されたベース基板と、
前記ベース基板に対向するように配置されるカバー基板と、
前記ベース基板と前記カバー基板との間に、前記機能部を囲むように配置される樹脂スペーサーとを含むMEMSデバイスであって、
前記樹脂スペーサーは、請求項1乃至12のいずれか一項に記載の樹脂スペーサー用フィルムにより形成されることを特徴とするMEMSデバイス。 - 請求項1乃至12のいずれか一項に記載の樹脂スペーサー用フィルムをカットするフィルムカット工程と、
前記フィルムカット工程でカットされた前記樹脂スペーサー用フィルムを、複数の光電変換部が形成されたウエハの表面にラミネートするラミネート工程と、
前記複数の光電変換部を囲む樹脂スペーサーが形成されるように、前記ウエハ上にラミネートされた前記樹脂スペーサー用フィルムを露光及び現像する露光現像工程と、
前記露光現像工程で形成された前記樹脂スペーサーを介して、前記ウエハと透明基板とを接着する接着工程と、
前記樹脂スペーサーを介して接着された前記ウエハと前記透明基板とを光電変換部単位に分割する分割工程とを含む受光装置の製造方法。 - 請求項1乃至12のいずれか一項に記載の樹脂スペーサー用フィルムをカットするフィルムカット工程と、
前記フィルムカット工程でカットされた前記樹脂スペーサー用フィルムを透明基板の表面にラミネートするラミネート工程と、
前記透明基板上に樹脂スペーサーが形成されるように、前記透明基板上にラミネートされた前記樹脂スペーサー用フィルムを露光及び現像する露光現像工程と、
前記露光現像工程で形成された前記樹脂スペーサーを介して、複数の光電変換部が形成されたウエハと前記透明基板とを、前記複数の光電変換部が前記樹脂スペーサーに囲まれるように接着する接着工程と、
前記樹脂スペーサーを介して接着された前記ウエハと前記透明基板とを光電変換部単位に分割する分割工程とを含む受光装置の製造方法。 - 請求項1乃至12のいずれか一項に記載の樹脂スペーサー用フィルムをカットするフィルムカット工程と、
前記フィルムカット工程でカットされた前記樹脂スペーサー用フィルムを、MEMS素子を含む機能部が形成されたウエハの表面にラミネートするラミネート工程と、
前記機能部を囲む樹脂スペーサーが形成されるように、前記ウエハ上にラミネートされた前記樹脂スペーサー用フィルムを露光及び現像する露光現像工程と、
前記露光現像工程で形成された前記樹脂スペーサーを介して、前記ウエハとカバー基板とを接着する接着工程とを含むMEMSデバイスの製造方法。 - 請求項1乃至12のいずれか一項に記載の樹脂スペーサー用フィルムをカットするフィルムカット工程と、
前記フィルムカット工程でカットされた前記樹脂スペーサー用フィルムをカバー基板の表面にラミネートするラミネート工程と、
前記カバー基板上に樹脂スペーサーが形成されるように、前記カバー基板上にラミネートされた前記樹脂スペーサー用フィルムを露光及び現像する露光現像工程と、
MEMS素子を含む機能部が形成されたウエハと前記カバー基板とを、前記露光現像工程で形成された前記樹脂スペーサーを介して、前記機能部が前記樹脂スペーサーに囲まれるように接着する接着工程とを含むMEMSデバイスの製造方法。
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