WO2013047106A1 - フルオレン構造を有する樹脂及びリソグラフィー用下層膜形成材料 - Google Patents
フルオレン構造を有する樹脂及びリソグラフィー用下層膜形成材料 Download PDFInfo
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- WO2013047106A1 WO2013047106A1 PCT/JP2012/072421 JP2012072421W WO2013047106A1 WO 2013047106 A1 WO2013047106 A1 WO 2013047106A1 JP 2012072421 W JP2012072421 W JP 2012072421W WO 2013047106 A1 WO2013047106 A1 WO 2013047106A1
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Classifications
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- G03F7/094—Multilayer resist systems, e.g. planarising layers
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/02—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G2261/3142—Condensed aromatic systems, e.g. perylene, anthracene or pyrene fluorene-based, e.g. fluorene, indenofluorene, or spirobifluorene
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- 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
- H01L21/18—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 the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
- H01L21/31116—Etching inorganic layers by chemical means by dry-etching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L21/18—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 the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
- H01L21/31133—Etching organic layers by chemical means
- H01L21/31138—Etching organic layers by chemical means by dry-etching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L21/18—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 the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
Definitions
- the present invention relates to a resin having a fluorene structure, which is useful in a multilayer resist process used for microfabrication in a manufacturing process of a semiconductor element or the like, and a manufacturing method thereof.
- the present invention also relates to a resin composition containing the resin, an underlayer film forming material for lithography, an underlayer film for lithography formed from the underlayer film forming material for lithography, and a pattern forming method using the material.
- these polyphenols and novolak resins are used as coating agents for semiconductors and resist resins, and heat resistance is required as one of the performances in these applications.
- it contains a polymer (acenaphthene resin) having a structure represented by the following formula as a monomer unit and a solvent as an antireflection film-forming composition that is useful for fine processing in a lithography process and particularly suitable for the production of integrated circuit elements.
- An antireflection film-forming composition is known (see Patent Document 4).
- the light source for lithography used in forming the resist pattern is shortened from KrF excimer laser (248 nm) to ArF excimer laser (193 nm).
- KrF excimer laser (248 nm)
- ArF excimer laser (193 nm)
- simply thinning the resist makes it difficult to obtain a resist pattern film thickness sufficient for substrate processing. Therefore, not only a resist pattern but also a process in which a resist underlayer film is formed between the resist and a semiconductor substrate to be processed and the resist underlayer film also has a function as a mask during substrate processing has become necessary.
- various resist underlayer films for such processes are known.
- a terminal layer is removed by applying a predetermined energy as a resist underlayer film for lithography having a dry etching rate selection ratio close to that of a resist.
- a material for forming a lower layer film for a multilayer resist process has been proposed which contains at least a resin component having a substituent that generates a sulfonic acid residue and a solvent (see Patent Document 5).
- a resist underlayer film material containing a polymer having a specific repeating unit has been proposed as a material for realizing a resist underlayer film for lithography having a lower dry etching rate selection ratio than a resist (see Patent Document 6). ).
- a repeating unit of acenaphthylenes and a repeating unit having a substituted or unsubstituted hydroxy group are copolymerized.
- a resist underlayer film material containing a polymer is proposed (see Patent Document 7).
- an amorphous carbon underlayer film formed by CVD using methane gas, ethane gas, acetylene gas or the like as a raw material is known.
- methane gas, ethane gas, acetylene gas or the like is known as a raw material.
- an underlayer film material that can form a resist underlayer film by a wet process such as spin coating or screen printing.
- the inventors of the present invention have a lithographic lower layer containing a naphthalene formaldehyde polymer containing a specific structural unit and an organic solvent as a material that is excellent in optical properties and etching resistance and is soluble in a solvent and applicable to a wet process.
- the film forming composition (refer patent document 8) is proposed.
- the technique of Patent Document 8 is required to be improved in terms of heat resistance and etching resistance.
- the present invention has been made in view of the above problems, and its purpose is that the carbon concentration in the resin is relatively high, it has high heat resistance, and the solvent solubility is also relatively high so that a wet process can be applied. Another object is to provide a resin having a novel fluorene structure and a method for producing the same. Another object of the present invention is to form a novel resist underlayer film having a relatively high solvent solubility and applicable to a wet process, for example, a multilayer resist underlayer film having excellent heat resistance and etching resistance. It is an object to provide a useful resin and a resin composition using the resin, an underlayer film forming material and an underlayer film forming material using the resin, and a pattern forming method using the material.
- the present inventors have found that the above problems can be solved by using a resin having a specific fluorene structure, and have completed the present invention. That is, the present invention provides the following [1] to [19].
- a resin having a structure represented by the following general formula (1) (In General Formula (1), R 3 and R 4 are each independently a benzene ring or a naphthalene ring, and the carbon atom at the bridge head position of the fluorene skeleton or (di) benzofluorene skeleton is a carbon of another aromatic ring.
- the structure represented by the general formula (1) is at least selected from the group consisting of the structures represented by the following general formula (2), general formula (3), general formula (4), and general formula (5).
- each X independently represents an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms or a cyclohexyl group, and p represents a number from 0 to 3; Represents a number from 0 to 2, and R 3 and R 4 have the same meaning as described in the general formula (1).
- Y ′ each independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or a cyclohexyl group
- Z is independently Represents an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms or a cyclohexyl group
- q represents a number from 1 to 3
- r represents a number from 0 to 3
- B represents from 0 to 2 R 3 and R 4 are the same as those described in the general formula (1), and when a plurality of Y ′ and Z are present, each may be the same or different, Y ′ may be X, Y ′, Z in the resin, or a single bond that forms a direct bond with the aromatic ring.
- Y ′ may be X, Y ′, Z in the resin, or a single bond that forms a direct bond with the aromatic ring.
- the raw material includes at least one selected from the group consisting of compounds represented by the following general formula (7), general formula (8), general formula (9) and general formula (10), The production method according to [4] or [5].
- X, p and A have the same meanings as described in the general formula (2).
- X and p have the same meanings as described in the general formula (2).
- each Y independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or a cyclohexyl group, and Z, q, r, and B represent And has the same meaning as that described in the general formula (4).
- Y, Z, q, and r have the same meanings as those described in the general formula (9).
- the compound represented by the general formula (6) is at least one selected from the group consisting of fluorene, fluorenone, fluorenol, benzofluorene, benzofluorenone, benzofluorenol, dibenzofluorene, dibenzofluorenone and dibenzofluorenol.
- the compound represented by the general formula (7) is at least one selected from the group consisting of benzene, toluene, xylene, trimethylbenzene, naphthalene, methylnaphthalene, dimethylnaphthalene, anthracene, methylanthracene, and dimethylanthracene.
- the compound represented by the general formula (9) is a group consisting of phenol, catechol, hydroquinone, cresol, ethylphenol, propylphenol, butylphenol, methylcatechol, methylhydroquinone, naphthol, dihydroxynaphthalene, hydroxyanthracene and dihydroxyanthracene.
- a resin composition comprising the resin according to any one of [1] to [3] above. [13] The resin composition according to the above [12], further comprising an organic solvent. [14] The resin composition according to the above [12] or [13], further comprising an acid generator. [15] The resin composition according to any one of [12] to [14], further including a crosslinking agent.
- a material for forming a lower layer film for lithography comprising the resin composition according to any one of [13] to [15].
- a lithography lower layer film formed from the lithography lower layer film forming material according to [16].
- a lower layer film is formed on the substrate using the lower layer film forming material described in [16], and at least one photoresist layer is formed on the lower layer film.
- a pattern forming method comprising irradiating the region with radiation and performing alkali development.
- a lower layer film is formed on the substrate using the lower layer film forming material described in [16], and an intermediate layer film is formed on the lower layer film using a resist intermediate layer film material containing silicon atoms.
- At least one photoresist layer on the intermediate layer film irradiating a required region of the photoresist layer with radiation, and developing the resist pattern by alkali development.
- a pattern forming method comprising forming the pattern.
- the resin having this fluorene structure is, for example, an electrical insulating material, a resist resin, a semiconductor sealing resin, an adhesive for printed wiring boards, an electrical laminate mounted on electrical equipment / electronic equipment / industrial equipment, etc.
- a material for forming a lower layer film for lithography useful for forming a photoresist lower layer film having a relatively high solvent solubility and applicable to a wet process and having excellent heat resistance and etching resistance is realized. be able to.
- this lower layer film forming material for lithography it is possible to form a lower layer film having excellent etching resistance and heat resistance against oxygen plasma etching, etc., and furthermore, excellent adhesion to the resist layer, An excellent resist pattern can be obtained.
- the resin having a fluorene structure of the present embodiment has a structure represented by the following general formula (1).
- the resin having a fluorene structure means that it has any of a fluorene skeleton, a benzofluorene skeleton, and a dibenzofluorene skeleton.
- R 3 and R 4 are each independently a benzene ring or a naphthalene ring, provided that the carbon atom at the bridge head position of the fluorene skeleton or the (di) benzofluorene skeleton is another aromatic ring.
- the carbon atom of the aromatic ring of the fluorene skeleton or (di) benzofluorene skeleton is bonded to the carbon atom at the bridge head position of the other fluorene skeleton or (di) benzofluorene skeleton.)
- the resin having the structure represented by the general formula (1) has a relatively high carbon concentration in the resin, and thus has high heat resistance and relatively high solvent solubility, and can be applied to a wet process. Since it is possible to realize an underlayer film for lithography having excellent heat resistance and etching resistance, it is particularly useful as a material for forming the underlayer film for lithography.
- the structure represented by the general formula (1) is at least one selected from the group consisting of the structures represented by the following general formula (2), general formula (3), general formula (4), and general formula (5). It is preferable that (In the general formula (2), each X independently represents an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or a cyclohexyl group. P represents a number from 0 to 3; Represents a number from 0 to 2.
- R 3 and R 4 are as defined above.)
- X, p, R 3 and R 4 are the same as described above.
- Y ′ each independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or a cyclohexyl group
- Z is independently Represents an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or a cyclohexyl group
- q represents a number of 1 to 3
- r represents a number of 0 to 3
- B represents a number of 0 to 2.
- R 3 and R 4 are the same as described above, and when there are a plurality of Y ′ and Z, each may be the same or different, and Y ′ may be X in the resin. , Y ′, Z, or a single bond that directly forms a bond with the aromatic ring.
- Y ′, Z, q, r, R 3 and R 4 are the same as described above.
- Y ' may be X, Y', Z in the resin, or a single bond that forms a direct bond with the aromatic ring.
- the structure represented by the general formula (1) is at least one selected from the group consisting of the structures represented by the general formula (2), the general formula (3), the general formula (4), and the general formula (5). Therefore, the resin containing the structure is particularly useful because it has a higher heat resistance and can form a lower layer film that is more excellent in etching resistance.
- the carbon concentration in the resin having a fluorene structure of the present embodiment is not particularly limited, but is preferably 80% by mass or more and 99.9% by mass or less, more preferably 85% from the viewpoint of improving heat resistance and etching resistance. It is 90 mass% or more and 99.9 mass% or less more preferably.
- the oxygen concentration in the resin having a fluorene structure of the present embodiment is not particularly limited, but is preferably 0 to 10% by mass, more preferably 0 to 7% by mass from the viewpoint of improving heat resistance and etching resistance. %, More preferably 0 to 5% by mass.
- the molecular weight of the resin having a fluorene structure of the present embodiment is not particularly limited, but the number average molecular weight (Mn) is preferably 100 to 5,000, more preferably 200 to 4,000, still more preferably 3, 00 to 3,000. Similarly, the weight average molecular weight (Mw) is preferably 800 to 10,000, more preferably 8,000 to 5,000, still more preferably 8,000 to 3,500. By being each in the said preferable range, it exists in the tendency for high viscosity to be suppressed, and also exists in the tendency for heat resistance to be improved and outgassing property to reduce.
- the dispersity Mw / Mn is not particularly limited, but is preferably 1 to 10, more preferably 1 to 8, and further preferably 1 to 6.
- the resin having a fluorene structure of the present embodiment is preferably a resin having a small amount of residual metal from the viewpoint of suppressing metal contamination when used for electronic materials, for example.
- the amount of residual metal is preferably 1000 mass ppb or less, more preferably 100 mass ppb or less, and still more preferably 50 mass ppb or less.
- a suitable synthesis method includes, for example, a method in which a raw material containing a compound represented by the following general formula (6) is reacted in the presence of a catalyst.
- a compound represented by the following general formula (6) may be abbreviated as “FL”.
- R 1 and R 2 are each independently a hydrogen atom or a hydroxyl group.
- R 1 and R 2 may collectively be one substituent, and In this case, it is an oxygen atom
- R 3 and R 4 are each independently a benzene ring or a naphthalene ring.
- the compound represented by the general formula (1) include fluorene, fluorenone, fluorenol, benzofluorene, benzofluorenone, benzofluorenol, dibenzofluorene, dibenzofluorenone, dibenzofluorenol and the like. It is not limited to these.
- the compound (FL) shown by General formula (6) can be used individually by 1 type or in combination of 2 or more types.
- the resin material further contains at least one selected from the group consisting of compounds represented by the following general formula (7), general formula (8), general formula (9) and general formula (10). Is preferred.
- each Y independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or a cyclohexyl group.
- Z, q, r, and B are The same as above, where when there are a plurality of Y and Z, each may be the same or different.
- Y, Z, q, and r are the same as described above. Here, when a plurality of Y and Z are present, each may be the same or different.
- Specific examples of the compound represented by the general formula (7) include benzene, toluene, xylene, ethylbenzene, propylbenzene, butylbenzene, cyclohexylbenzene, biphenyl, naphthalene, methylnaphthalene, dimethylnaphthalene, anthracene and the like. However, it is not particularly limited to these. Of these aromatic hydrocarbons, polycyclic aromatics are preferred because of their excellent heat resistance.
- Specific examples of the compound represented by the general formula (8) include, for example, phenanthrene, methylphenanthrene and dimethylphenanthrene, but are not particularly limited thereto.
- the above aromatic hydrocarbons (AR) can be used singly or in combination of two or more.
- Specific examples of the compound represented by the general formula (9) include, for example, phenol, catechol, resorcinol, hydroquinone, cresol, ethylphenol, propylphenol, butylphenol, methylcatechol, methylresorcinol, methylhydroquinone, phenylmethyl ether, 3- Examples thereof include, but are not limited to, methoxybenzene, 3-methoxybenzene, naphthol, methylnaphthol, dihydroxynaphthalene, methyldihydroxynaphthalene, naphthylmethyl ether, and dimethoxynaphthalene.
- polycyclic aromatics are preferred because of their excellent heat resistance.
- Specific examples of the compound represented by the general formula (10) include phenanthrol, methylphenanthrol, dimethylphenanthrol, dihydroxyphenanthrol, phenanthrylmethyl ether, dimethoxyphenanthrene, and the like. There is no particular limitation.
- phenols (PH) can be used alone or in combination of two or more.
- the molar ratio when the above raw material compound is reacted is not particularly limited, but FL: AR: PH is preferably 1: 0 to 1.5: 0 to 1.5, more preferably 1: 0 to 1.0: 0 to 1.0, more preferably 1: 0 to 0.5: 0.5 to 1.0.
- FL: AR: PH is preferably 1: 0 to 1.5: 0 to 1.5, more preferably 1: 0 to 1.0: 0 to 1.0, more preferably 1: 0 to 0.5: 0.5 to 1.0.
- reaction conditions are not particularly limited, and can be set as appropriate.
- a solvent inert to the above reaction can be used.
- the solvent include saturated aliphatic hydrocarbons such as heptane and hexane; alicyclic hydrocarbons such as cyclohexane; ethers such as dioxane and dibutyl ether; alcohols such as 2-propanol; ketones such as methyl isobutyl ketone; Examples thereof include carboxylic acids such as toluic acid, but are not particularly limited thereto.
- a solvent can be used individually by 1 type or in combination of 2 or more types.
- the catalyst that can be used in the above reaction can be appropriately selected from known ones and is not particularly limited.
- inorganic acids and organic acids are widely known, and specific examples thereof include inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid, hydrobromic acid, hydrofluoric acid, oxalic acid, Malonic acid, succinic acid, adipic acid, sebacic acid, citric acid, fumaric acid, maleic acid, formic acid, p-toluenesulfonic acid, methanesulfonic acid, trifluoroacetic acid, dichloroacetic acid, trichloroacetic acid, trifluoromethanesulfonic acid, benzenesulfone Acids, organic acids such as naphthalene sulfonic acid, naphthalene disulfonic acid, Lewis acids such as zinc chloride, aluminum chloride, iron chloride, boron trifluoride, silicotungstic acid, phosphotungsten, phosphat
- inorganic acids, sulfonic acids and tungstic acids are preferable, and oxalic acid, citric acid, p-toluenesulfonic acid, methanesulfonic acid, trifluoromethanesulfonic acid, and benzenesulfone are more preferable.
- a catalyst can be used individually by 1 type or in combination of 2 or more types.
- the amount of catalyst used can be appropriately set according to the raw materials and modifiers used, the type of catalyst used, and the reaction conditions, and is not particularly limited.
- the main raw materials (FL) and modifiers (AR, PH) are not particularly limited.
- the total amount is preferably 0.01 to 100 parts by mass, more preferably 0.1 to 50 parts by mass, and still more preferably 0.1 to 25 parts by mass.
- the reaction time is not particularly limited, but is preferably 1 to 10 hours, more preferably about 2 to 8 hours. By setting it as the said preferable reaction time, it exists in the tendency for the resin which has the target property to be obtained economically and industrially advantageously.
- the solvent is further added to the reaction solution and diluted, and then allowed to stand to separate into two phases, and the resin phase that is an oil phase and the aqueous phase are separated, and then further washed with water.
- the catalyst having the fluorene structure as the target product can be obtained by removing the catalyst completely and removing the added solvent, unreacted modifier and the like by a general method such as distillation.
- the amount of residual metal in the resin can be reduced by a known method.
- a method of washing a resin solution with ultrapure water or the like a method of contacting with an ion exchange resin, and the like.
- an epoxy group can be introduced into the phenolic hydroxyl group, thereby further enhancing the curability of the resin and further increasing the outgassing property. Can be reduced.
- the introduction of the epoxy group can be performed by a known method, and is not particularly limited.
- an epoxy group can be introduced into a resin having a fluorene structure by the action of a base by reacting a resin having a phenolic hydroxyl group with an epoxy-containing compound such as epichlorohydrin.
- the resin having the fluorene structure is preferably highly soluble in a solvent. More specifically, the resin having the fluorene structure preferably has a solubility in cyclohexanone of 10% by mass or more.
- the solubility in cyclohexanone is defined as “resin mass ⁇ (resin mass + solvent mass) ⁇ 100 (mass%)”.
- the solubility of the resin having a fluorene structure in cyclohexanone is “10% by mass or more”. It becomes.
- the resin composition of this embodiment contains the resin having the above-mentioned fluorene structure.
- the resin composition of the present embodiment may contain an organic solvent as necessary.
- the resin composition of this embodiment may contain other components, such as a crosslinking agent and an acid generator, as needed. Since these other components such as the organic solvent, the crosslinking agent, and the acid generator will be described later in the description of the material for forming a lower layer film for lithography, a duplicate description is omitted here.
- the material for forming a lower layer film for lithography includes at least the resin having the fluorene structure described above and an organic solvent.
- the content of the resin having the fluorene structure is not particularly limited, but is 1 to 33 parts by mass with respect to 100 parts by mass in total including the organic solvent.
- the amount is preferably 2 to 25 parts by mass, more preferably 3 to 20 parts by mass.
- the organic solvent that can be used in the material for forming a lower layer film for lithography according to the present embodiment is not particularly limited as long as it can dissolve at least the resin having the above fluorene structure, and a known one can be appropriately used.
- the organic solvent include, for example, ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, cellosolv solvents such as propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate, ethyl lactate, methyl acetate, ethyl acetate, Ester solvents such as butyl acetate, isoamyl acetate, ethyl lactate, methyl methoxypropionate, methyl hydroxyisobutyrate, alcohol solvents such as methanol, ethanol, isopropanol, 1-ethoxy-2-propanol, toluene, xylene,
- cyclohexanone, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethyl lactate, methyl hydroxyisobutyrate, anisole and the like are preferable from the viewpoint of safety.
- a resin having a solubility in propylene glycol monomethyl ether acetate of 10% by mass or more is preferably used.
- the content of the organic solvent is not particularly limited. However, from the viewpoint of solubility and film formation, the content of the organic solvent is from 100 to 100 parts by mass with respect to 100 parts by mass of the resin having the fluorene structure. The amount is preferably 10,000 parts by mass, more preferably 200 to 5,000 parts by mass.
- the lower layer film forming material for lithography of the present embodiment may contain a crosslinking agent as necessary from the viewpoint of suppressing intermixing.
- the crosslinking agent include compounds containing double bonds such as melamine compounds, guanamine compounds, glycoluril compounds or urea compounds, epoxy compounds, thioepoxy compounds, isocyanate compounds, azide compounds, alkenyl ether groups, and methylol groups. , Substituted with at least one group selected from an alkoxymethyl group and an acyloxymethyl group, but is not particularly limited thereto.
- these crosslinking agents can be used individually by 1 type or in combination of 2 or more types. These may be used as additives, but these crosslinkable groups may be introduced as pendant groups into the polymer side chain.
- a compound containing a hydroxy group can also be used as a crosslinking agent.
- epoxy compound examples include tris (2,3-epoxypropyl) isocyanurate, trimethylolmethane triglycidyl ether, trimethylolpropane triglycidyl ether, triethylolethane triglycidyl ether and the like.
- the melamine compound examples include hexamethylol melamine, hexamethoxymethyl melamine, a compound in which 1 to 6 methylol groups of hexamethylol melamine are methoxymethylated or a mixture thereof, hexamethoxyethyl melamine, hexaacyloxymethyl melamine, hexa Examples thereof include compounds in which 1 to 6 methylol groups of methylolmelamine are acyloxymethylated, or mixtures thereof.
- the guanamine compound examples include tetramethylolguanamine, tetramethoxymethylguanamine, a compound in which 1 to 4 methylol groups of tetramethylolguanamine are methoxymethylated, or a mixture thereof, tetramethoxyethylguanamine, tetraacyloxyguanamine, tetramethylol Examples thereof include compounds in which 1 to 4 methylol groups of guanamine are acyloxymethylated, or mixtures thereof.
- glycoluril compound examples include tetramethylol glycoluril, tetramethoxyglycoluril, tetramethoxymethylglycoluril, a compound in which 1 to 4 methylol groups of tetramethylolglycoluril are methoxymethylated, or a mixture thereof, tetramethylol glycol Examples thereof include compounds in which 1 to 4 methylol groups of uril are acyloxymethylated, or mixtures thereof.
- urea compound examples include tetramethylol urea, tetramethoxymethyl urea, a compound obtained by methoxymethylating 1 to 4 methylol groups of tetramethylol urea, a mixture thereof, and tetramethoxyethyl urea.
- the compound containing an alkenyl ether group examples include ethylene glycol divinyl ether, triethylene glycol divinyl ether, 1,2-propanediol divinyl ether, 1,4-butanediol divinyl ether, tetramethylene glycol divinyl ether, neopentyl glycol.
- Examples include divinyl ether, trimethylolpropane trivinyl ether, hexanediol divinyl ether, 1,4-cyclohexanediol divinyl ether, pentaerythritol trivinyl ether, pentaerythritol tetravinyl ether, sorbitol tetravinyl ether, sorbitol pentavinyl ether, and trimethylolpropane trivinyl ether.
- the content of the crosslinking agent is not particularly limited, but is preferably 5 to 50 parts by mass with respect to 100 parts by mass of the resin having the fluorene structure.
- the amount is preferably 10 to 40 parts by mass.
- the underlayer film forming material for lithography of the present embodiment may contain an acid generator as necessary from the viewpoint of further promoting the crosslinking reaction by heat.
- acid generators in the art include those that generate acid by thermal decomposition and those that generate acid by light irradiation, and any of them can be used.
- an acid generator 1) an onium salt of the following general formula (P1a-1), (P1a-2), (P1a-3) or (P1b), 2) a diazomethane derivative of the following general formula (P2), 3) a glyoxime derivative of the following general formula (P3), 4) A bissulfone derivative of the following general formula (P4), 5) A sulfonic acid ester of an N-hydroxyimide compound of the following general formula (P5), 6) ⁇ -ketosulfonic acid derivative, 7) a disulfone derivative, 8) Nitrobenzyl sulfonate derivative, 9) Examples thereof include, but are not particularly limited to, sulfonic acid ester derivatives. In addition, these acid generators can be used individually by 1 type or in combination of 2 or more types.
- R 101a , R 101b and R 101c are each independently a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms, an alkenyl group, an oxoalkyl group, an oxoalkenyl group, a carbon number of 6 to 20 aryl groups, aralkyl groups having 7 to 12 carbon atoms, or aryloxoalkyl groups, part or all of hydrogen atoms of these groups may be substituted with alkoxy groups or the like.
- R 101b and R 101c may form a ring. When a ring is formed, R 101b and R 101c each independently represent an alkylene group having 1 to 6 carbon atoms.
- K ⁇ represents a non-nucleophilic counter ion.
- R 101d , R 101e , R 101f and R 101g are each independently represented by adding a hydrogen atom to R 101a , R 101b and R 101c .
- R 101d and R 101e , R 101d and R 101e and R 101f may form a ring, and in the case of forming a ring, R 101d and R 101e and R 101d , R 101e and R 101f have 3 carbon atoms.
- R 101a , R 101b , R 101c , R 101d , R 101e , R 101f and R 101g may be the same as or different from each other.
- the alkyl group includes methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, pentyl, hexyl, heptyl, octyl, cyclopentyl.
- alkenyl group examples include a vinyl group, an allyl group, a propenyl group, a butenyl group, a hexenyl group, and a cyclohexenyl group.
- Examples of the oxoalkyl group include 2-oxocyclopentyl group, 2-oxocyclohexyl group, and the like, and further, 2-oxopropyl group, 2-cyclopentyl-2-oxoethyl group, 2-cyclohexyl-2-oxoethyl group, 2-oxo And (4-methylcyclohexyl) -2-oxoethyl group.
- Examples of the oxoalkenyl group include a 2-oxo-4-cyclohexenyl group and a 2-oxo-4-propenyl group.
- aryl group examples include a phenyl group, a naphthyl group, a p-methoxyphenyl group, an m-methoxyphenyl group, an o-methoxyphenyl group, an ethoxyphenyl group, a p-tert-butoxyphenyl group, and an m-tert-butoxyphenyl group.
- Alkylphenyl groups such as alkoxyphenyl groups, 2-methylphenyl groups, 3-methylphenyl groups, 4-methylphenyl groups, ethylphenyl groups, 4-tert-butylphenyl groups, 4-butylphenyl groups, dimethylphenyl groups, etc.
- Alkyl naphthyl groups such as methyl naphthyl group and ethyl naphthyl group, alkoxy naphthyl groups such as methoxy naphthyl group and ethoxy naphthyl group, dialkyl naphthyl groups such as dimethyl naphthyl group and diethyl naphthyl group, dimethoxy naphthyl group and diethoxy naphthyl group Dialkoxynaphthyl Etc. The.
- Examples of the aralkyl group include a benzyl group, a phenylethyl group, and a phenethyl group.
- Examples of the aryloxoalkyl group 2-aryl-2-oxoethyl group such as 2-phenyl-2-oxoethyl group, 2- (1-naphthyl) -2-oxoethyl group, 2- (2-naphthyl) -2-oxoethyl group, etc. Groups and the like.
- Non-nucleophilic counter ions of K 2 ⁇ include halide ions such as chloride ions and bromide ions, triflate, fluoroalkyl sulfonates such as 1,1,1-trifluoroethanesulfonate, nonafluorobutanesulfonate, tosylate, and benzene.
- fluoroalkyl sulfonates such as 1,1,1-trifluoroethanesulfonate, nonafluorobutanesulfonate, tosylate, and benzene.
- aryl sulfonates such as sulfonate, 4-fluorobenzene sulfonate and 1,2,3,4,5-pentafluorobenzene sulfonate
- alkyl sulfonates such as mesylate and butane sulfonate.
- the heteroaromatic ring includes an imidazole derivative (for example, imidazole, 4- Methylimidazole, 4-methyl-2-phenylimidazole, etc.), pyrazole derivatives, furazane derivatives, pyrroline derivatives (eg pyrroline, 2-methyl-1-pyrroline etc.), pyrrolidine derivatives (eg pyrrolidine, N-methylpyrrolidine, pyrrolidinone, N -Methylpyrrolidone etc.), imidazoline derivatives, imidazolidine derivatives, pyridine derivatives (eg pyridine, methylpyridine, ethylpyridine, propylpyridine, butylpyridine, 4- (1-butylpentyl) pyridine, dimethylpyridine, trimethylpyridine, triethylpyridine, Phenyl
- imidazole derivative for example, imidazole, 4- Methylimidazole, 4-methyl-2-phenylimidazole
- the general formula (P1a-1) and the general formula (P1a-2) are effective as both a photoacid generator and a thermal acid generator, but the general formula (P1a-3) acts as a thermal acid generator. To do.
- R 102a and R 102b each independently represent a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms.
- R 103 represents a linear, branched or cyclic alkylene group having 1 to 10 carbon atoms.
- R 104a and R 104b each independently represents a 3-oxoalkyl group having 3 to 7 carbon atoms.
- K ⁇ represents a non-nucleophilic counter ion.
- R 102a and R 102b include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group, a heptyl group, and an octyl group.
- R 103 includes methylene group, ethylene group, propylene group, butylene group, pentylene group, hexylene group, heptylene group, octylene group, nonylene group, 1,4-cyclohexylene group, 1,2-cyclohexylene. Group, 1,3-cyclopentylene group, 1,4-cyclooctylene group, 1,4-cyclohexanedimethylene group and the like.
- R 104a and R 104b include a 2-oxopropyl group, a 2-oxocyclopentyl group, a 2-oxocyclohexyl group, and a 2-oxocycloheptyl group.
- K ⁇ examples include the same as those described in the general formulas (P1a-1), (P1a-2), and (P1a-3).
- R 105 and R 106 are each independently a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms, a halogenated alkyl group, an aryl group having 6 to 20 carbon atoms, a halogen atom, An aryl group or an aralkyl group having 7 to 12 carbon atoms.
- Examples of the alkyl group represented by R 105 and R 106 include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, heptyl group, octyl group, Examples include amyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, norbornyl group, adamantyl group and the like.
- halogenated alkyl group examples include a trifluoromethyl group, 1,1,1-trifluoroethyl group, 1,1,1-trichloroethyl group, nonafluorobutyl group, and the like.
- an alkoxyphenyl group such as a phenyl group, a p-methoxyphenyl group, an m-methoxyphenyl group, an o-methoxyphenyl group, an ethoxyphenyl group, a p-tert-butoxyphenyl group, or an m-tert-butoxyphenyl group
- alkylphenyl groups such as 2-methylphenyl group, 3-methylphenyl group, 4-methylphenyl group, ethylphenyl group, 4-tert-butylphenyl group, 4-butylphenyl group and dimethylphenyl group.
- halogenated aryl group examples include a fluorophenyl group, a chlorophenyl group, and 1,2,3,4,5-pentafluorophenyl group.
- aralkyl group examples include a benzyl group and a phenethyl group.
- R 107 , R 108 and R 109 are each independently a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms, a halogenated alkyl group, or an aryl having 6 to 20 carbon atoms. Group, a halogenated aryl group or an aralkyl group having 7 to 12 carbon atoms.
- R 108 and R 109 may be bonded to each other to form a cyclic structure.
- R 108 and R 109 each represent a linear or branched alkylene group having 1 to 6 carbon atoms. .
- Examples of the alkyl group, halogenated alkyl group, aryl group, halogenated aryl group, and aralkyl group of R 107 , R 108 , and R 109 include the same groups as those described for R 105 and R 106 .
- Examples of the alkylene group for R 108 and R 109 include a methylene group, an ethylene group, a propylene group, a butylene group, and a hexylene group.
- R 101a and R 101b are the same as described above.
- R 110 represents an arylene group having 6 to 10 carbon atoms, an alkylene group having 1 to 6 carbon atoms, or an alkenylene group having 2 to 6 carbon atoms, and part or all of the hydrogen atoms of these groups May further be substituted with a linear or branched alkyl group or alkoxy group having 1 to 4 carbon atoms, a nitro group, an acetyl group or a phenyl group.
- R 111 represents a linear, branched or substituted alkyl group, alkenyl group, alkoxyalkyl group, phenyl group or naphthyl group having 1 to 8 carbon atoms, and some or all of the hydrogen atoms of these groups are further carbon atoms.
- examples of the arylene group of R 110 include a 1,2-phenylene group and a 1,8-naphthylene group.
- examples of the alkylene group include methylene group, ethylene group, trimethylene group, tetramethylene group, phenylethylene group, norbornane-2,3-diyl group and the like.
- examples of the alkenylene group include a 1,2-vinylene group, a 1-phenyl-1,2-vinylene group, and a 5-norbornene-2,3-diyl group.
- Examples of the alkyl group for R 111 include the same groups as R 101a to R 101c .
- Examples of the alkenyl group include vinyl group, 1-propenyl group, allyl group, 1-butenyl group, 3-butenyl group, isoprenyl group, 1-pentenyl group, 3-pentenyl group, 4-pentenyl group, dimethylallyl group, 1- Examples include a hexenyl group, a 3-hexenyl group, a 5-hexenyl group, a 1-heptenyl group, a 3-heptenyl group, a 6-heptenyl group, and a 7-octenyl group.
- alkoxyalkyl group methoxymethyl group, ethoxymethyl group, propoxymethyl group, butoxymethyl group, pentyloxymethyl group, hexyloxymethyl group, heptyloxymethyl group, methoxyethyl group, ethoxyethyl group, propoxyethyl group, Butoxyethyl group, pentyloxyethyl group, hexyloxyethyl group, methoxypropyl group, ethoxypropyl group, propoxypropyl group, butoxypropyl group, methoxybutyl group, ethoxybutyl group, propoxybutyl group, methoxypentyl group, ethoxypentyl group, A methoxyhexyl group, a methoxyheptyl group, etc. are mentioned.
- examples of the optionally substituted alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, and a tert-butyl group.
- examples of the alkoxy group having 1 to 4 carbon atoms include methoxy group, ethoxy group, propoxy group, isopropoxy group, n-butoxy group, isobutoxy group, tert-butoxy group and the like.
- Examples of the phenyl group which may be substituted with an alkyl group having 1 to 4 carbon atoms, an alkoxy group, a nitro group or an acetyl group include a phenyl group, a tolyl group, a p-tert-butoxyphenyl group, a p-acetylphenyl group, p -Nitrophenyl group and the like.
- Examples of the heteroaromatic group having 3 to 5 carbon atoms include a pyridyl group and a furyl group.
- tetramethylammonium trifluoromethanesulfonate tetramethylammonium nonafluorobutanesulfonate, triethylammonium nonafluorobutanesulfonate, pyridinium nonafluorobutanesulfonate, triethylammonium camphorsulfonate, pyridinium camphorsulfonate, nona Tetra n-butylammonium fluorobutanesulfonate, tetraphenylammonium nonafluorobutanesulfonate, tetramethylammonium p-toluenesulfonate, diphenyliodonium trifluoromethanesulfonate, phenyliodonium trifluoromethanesulfonate (p-tert-butoxyphenyl) phenyliodonium, p-Toluenesulf
- triphenylsulfonium trifluoromethanesulfonate trifluoromethanesulfonic acid (p-tert-butoxyphenyl) diphenylsulfonium, trifluoromethanesulfonic acid tris (p-tert-butoxyphenyl) sulfonium, p-toluenesulfonic acid Triphenylsulfonium, p-toluenesulfonic acid (p-tert-butoxyphenyl) diphenylsulfonium, p-toluenesulfonic acid tris (p-tert-butoxyphenyl) sulfonium, trifluoromethanesulfonic acid trinaphthylsulfonium, trifluoromethanesulfonic acid cyclohexylmethyl (2-oxocyclohexyl) sulfonium, trifluoromethanesulfonic acid cyclo
- the said acid generator can be used individually by 1 type or in combination of 2 or more types.
- the content of the acid generator is not particularly limited, but is 0.1 to 50 parts by mass with respect to 100 parts by mass of the resin having the fluorene structure. It is preferably 0.5 to 40 parts by mass.
- the material for forming a lower layer film for lithography according to the present embodiment may contain a basic compound from the viewpoint of improving storage stability.
- the basic compound serves as a quencher for the acid to prevent the acid generated in a trace amount from the acid generator from causing the crosslinking reaction to proceed.
- Examples of such basic compounds include primary, secondary, and tertiary aliphatic amines, hybrid amines, aromatic amines, heterocyclic amines, nitrogen-containing compounds having a carboxy group, and sulfonyl groups. Nitrogen-containing compounds having a hydroxyl group, nitrogen-containing compounds having a hydroxyl group, nitrogen-containing compounds having a hydroxyphenyl group, alcoholic nitrogen-containing compounds, amide derivatives, imide derivatives, and the like, but are not particularly limited thereto.
- primary aliphatic amines include ammonia, methylamine, ethylamine, n-propylamine, isopropylamine, n-butylamine, isobutylamine, sec-butylamine, tert-butylamine, pentylamine, tert-amylamine.
- secondary aliphatic amines include dimethylamine, diethylamine, di-n-propylamine, diisopropylamine, di-n-butylamine, diisobutylamine, di-sec-butylamine, dipentylamine, dicyclopentylamine.
- tertiary aliphatic amines include trimethylamine, triethylamine, tri-n-propylamine, triisopropylamine, tri-n-butylamine, triisobutylamine, tri-sec-butylamine, tripentylamine, tripentylamine, Cyclopentylamine, trihexylamine, tricyclohexylamine, triheptylamine, trioctylamine, trinonylamine, tridecylamine, tridodecylamine, tricetylamine, N, N, N ′, N′-tetramethylmethylenediamine, Examples thereof include N, N, N ′, N′-tetramethylethylenediamine, N, N, N ′, N′-tetramethyltetraethylenepentamine and the like.
- the mixed amines include dimethylethylamine, methylethylpropylamine, benzylamine, phenethylamine, benzyldimethylamine and the like.
- aromatic amines and heterocyclic amines include aniline derivatives (for example, aniline, N-methylaniline, N-ethylaniline, N-propylaniline, N, N-dimethylaniline, 2-methylaniline, 3- Methylaniline, 4-methylaniline, ethylaniline, propylaniline, trimethylaniline, 2-nitroaniline, 3-nitroaniline, 4-nitroaniline, 2,4-dinitroaniline, 2,6-dinitroaniline, 3,5- Dinitroaniline, N, N-dimethyltoluidine, etc.), diphenyl (p-tolyl) amine, methyldiphenylamine, triphenylamine, phenylenediamine, naphthylamine, diaminona
- nitrogen-containing compound having a carboxy group examples include aminobenzoic acid, indolecarboxylic acid, amino acid derivatives (for example, nicotinic acid, alanine, arginine, aspartic acid, glutamic acid, glycine, histidine, isoleucine, glycylleucine, Leucine, methionine, phenylalanine, threonine, lysine, 3-aminopyrazine-2-carboxylic acid, methoxyalanine) and the like.
- aminobenzoic acid for example, nicotinic acid, alanine, arginine, aspartic acid, glutamic acid, glycine, histidine, isoleucine, glycylleucine, Leucine, methionine, phenylalanine, threonine, lysine, 3-aminopyrazine-2-carboxylic acid, methoxyalan
- nitrogen-containing compound having a sulfonyl group examples include 3-pyridinesulfonic acid and pyridinium p-toluenesulfonate.
- nitrogen-containing compounds having a hydroxyl group, nitrogen-containing compounds having a hydroxyphenyl group, and alcoholic nitrogen-containing compounds include 2-hydroxypyridine, aminocresol, 2,4-quinolinediol, 3-indolemethanol hydrate, mono Ethanolamine, diethanolamine, triethanolamine, N-ethyldiethanolamine, N, N-diethylethanolamine, triisopropanolamine, 2,2'-iminodiethanol, 2-aminoethanol, 3-amino-1-propanol, 4- Amino-1-butanol, 4- (2-hydroxyethyl) morpholine, 2- (2-hydroxyethyl) pyridine, 1- (2-hydroxyethyl) piperazine, 1- [2- (2-hydroxyethoxy) ethyl]
- amide derivative examples include formamide, N-methylformamide, N, N-dimethylformamide, acetamide, N-methylacetamide, N, N-dimethylacetamide, propionamide, benzamide and the like.
- imide derivative examples include phthalimide, succinimide, maleimide and the like.
- the content of the basic compound is not particularly limited, but is 0.001 to 2 parts by mass with respect to 100 parts by mass of the resin having the fluorene structure. Preferably, it is 0.01 to 1 part.
- the lower layer film forming material for lithography of the present embodiment may contain other resins and / or compounds for the purpose of imparting thermosetting properties and controlling the absorbance.
- Such other resins and / or compounds include naphthol resins, xylene resins, naphthol modified resins, phenol modified resins of naphthalene resins, polyhydroxystyrene, dicyclopentadiene resins, (meth) acrylates, dimethacrylates, trimethacrylates, tetra Resins containing no heterocyclic ring or aromatic ring such as methacrylate, vinyl naphthalene, polyacenaphthylene and other naphthalene rings, phenanthrenequinone, biphenyl rings such as fluorene, hetero rings having hetero atoms such as thiophene and indene; rosin resins; Examples thereof include resins or compounds containing an alicyclic structure such as cyclodextrin, adam
- the underlayer film for lithography of this embodiment is formed from the above-described material for forming an underlayer film for lithography.
- a lower layer film is formed on the substrate using the above-described lower layer film forming material for lithography, and at least one photoresist layer is formed on the lower layer film. Then, radiation is applied to a required region of the photoresist layer and alkali development is performed.
- the multilayer resist pattern forming method of the present embodiment includes forming a lower layer film on the substrate using the above-described lithography lower layer film forming material, and a resist intermediate layer film containing silicon atoms on the lower layer film An intermediate layer film is formed using a material, and at least one photoresist layer is formed on the intermediate layer film. Then, a predetermined region of the photoresist layer is irradiated with radiation, and alkali development is performed to form a resist. After forming the pattern, the intermediate layer film is etched using the resist pattern as a mask, the lower layer film is etched using the obtained intermediate layer film pattern as an etching mask, and the resulting lower layer film pattern is used as an etching mask. Is etched to form a pattern on the substrate.
- the formation method of the underlayer film for lithography of the present embodiment is not particularly limited as long as it is formed from the above-described material for forming an underlayer film for lithography, and a technique known in the art can be applied.
- a technique known in the art can be applied.
- the lower layer film forming material for lithography described above onto a substrate by a known coating method such as spin coating or screen printing or a printing method
- the lower layer film is removed by evaporating an organic solvent or the like. Can be formed.
- the baking temperature is not particularly limited, but is preferably in the range of 80 to 450 ° C., more preferably 200 to 400 ° C.
- the baking time is not particularly limited, but is preferably within the range of 10 to 300 seconds.
- the thickness of the lower layer film can be appropriately selected according to the required performance, and is not particularly limited, but is usually preferably about 30 to 20,000 nm, more preferably 50 to 15,000 nm. is there.
- a silicon-containing resist layer or a single layer resist made of normal hydrocarbon is formed on the lower layer film, and in the case of a three-layer process, a silicon-containing layer is formed on the lower layer film.
- a single-layer resist layer not containing silicon can be formed on the intermediate layer and further on the silicon-containing intermediate layer.
- the photoresist material for forming the resist layer can be appropriately selected from known materials and is not particularly limited.
- a silicon-containing resist material for a two-layer process from the point of resistance to oxygen gas etching, a silicon atom-containing polymer such as a polysilsesquioxane derivative or a vinylsilane derivative is used as a base polymer, and an organic solvent, an acid generator, A positive type photoresist material containing a basic compound or the like is preferably used if necessary, but is not particularly limited.
- a silicon atom containing polymer the well-known polymer used in this kind of resist material can be used.
- a polysilsesquioxane-based intermediate layer is preferably used as the silicon-containing intermediate layer for the three-layer process.
- the intermediate layer With an effect as an antireflection film, reflection can be suppressed.
- the light absorption coefficient k value tends to increase and the substrate reflection tends to increase, but the reflection is suppressed by the intermediate layer.
- the substrate reflection can be reduced to 0.5% or less.
- polysilsesquioxane crosslinked with an acid or heat in which a light absorbing group having a phenyl group or a silicon-silicon bond is introduced is preferably used for 193 nm exposure.
- a light absorbing group having a phenyl group or a silicon-silicon bond is introduced
- an intermediate layer formed by a Chemical-Vapor-deposition (CVD) method can be used.
- a SiON film is known as an intermediate layer having a high effect as an antireflection film manufactured by a CVD method.
- the formation of the intermediate layer by a wet process such as spin coating or screen printing has a simpler and more cost-effective advantage than the CVD method.
- the upper layer resist in the three-layer process may be either a positive type or a negative type, and the same one as a commonly used single layer resist can be used.
- the lower layer film of this embodiment can also be used as an antireflection film for a normal single layer resist or a base material for suppressing pattern collapse. Since the lower layer film of this embodiment is excellent in etching resistance for the base processing, it can be expected to function as a hard mask for the base processing.
- a wet process such as spin coating or screen printing is preferably used as in the case of forming the lower layer film.
- prebaking is usually performed, but this prebaking is preferably performed at 80 to 180 ° C. for 10 to 300 seconds.
- a resist pattern can be obtained by performing exposure, post-exposure baking (PEB), and development.
- the thickness of the resist film is not particularly limited, but is generally preferably 30 to 500 nm, and more preferably 50 to 400 nm.
- the exposure light may be appropriately selected and used according to the photoresist material to be used.
- high energy rays having a wavelength of 300 nm or less, specifically, 248 nm, 193 nm, 157 nm excimer laser, 3 to 20 nm soft X-ray, electron beam, X-ray and the like can be mentioned.
- the resist pattern formed by the above method is one in which pattern collapse is suppressed by the lower layer film of this embodiment. Therefore, by using the lower layer film of this embodiment, a finer pattern can be obtained, and the exposure amount necessary for obtaining the resist pattern can be reduced.
- gas etching is preferably used as the etching of the lower layer film in the two-layer process.
- gas etching etching using oxygen gas is suitable.
- an inert gas such as He or Ar, or CO, CO 2 , NH 3 , SO 2 , N 2 , NO 2 or H 2 gas may be added.
- gas etching can be performed only with CO, CO 2 , NH 3 , N 2 , NO 2, and H 2 gas without using oxygen gas.
- the latter gas is used for side wall protection for preventing undercut of the pattern side wall.
- gas etching is also preferably used in the etching of the intermediate layer in the three-layer process.
- the gas etching the same one as described in the above two-layer process can be applied.
- the processing of the intermediate layer in the three-layer process is preferably performed using a fluorocarbon gas and a resist pattern as a mask.
- the lower layer film is processed by, for example, oxygen gas etching using the intermediate layer pattern as a mask.
- a silicon oxide film, a silicon nitride film, or a silicon oxynitride film is formed by a CVD method, an ALD method, or the like.
- the method for forming the nitride film is described in Japanese Patent Application Laid-Open No. 2002-334869 and WO 2004/066377.
- a photoresist film may be formed directly on such an intermediate film, but an organic antireflection film (BARC) is formed on the intermediate film by spin coating, and a photoresist film is formed thereon. May be.
- an intermediate layer based on polysilsesquioxane is also preferably used.
- the resist intermediate layer film As an antireflection film, reflection can be suppressed. Examples of the material for the polysilsesquioxane-based intermediate layer are described in JP-A-2007-226170 and JP-A-2007-226204.
- Etching of the next substrate can also be performed by a conventional method.
- the substrate is SiO 2 or SiN
- etching mainly using a chlorofluorocarbon gas and if p-Si, Al, or W is chlorine or bromine gas, Etching mainly composed of can be performed.
- the substrate processing is etched with chlorofluorocarbon gas, the silicon-containing resist in the two-layer resist process and the silicon-containing intermediate layer in the three-layer process are peeled off simultaneously with the substrate processing.
- the silicon-containing resist layer or the silicon-containing intermediate layer is peeled off separately, and generally dry etching peeling with a chlorofluorocarbon-based gas is performed after the substrate processing. .
- the lower layer film of this embodiment is characterized by excellent etching resistance of these substrates.
- a substrate known in the art can be appropriately selected and used, and is not particularly limited. For example, Si, ⁇ -Si, p-Si, SiO 2 , SiN, SiON, W, TiN, Al etc. are mentioned.
- the substrate may be a laminate having a film to be processed on a base material (support). Examples of such a film to be processed include various low-k films such as Si, SiO 2 , SiON, SiN, p-Si, ⁇ -Si, W, W-Si, Al, Cu, and Al-Si, and their stopper films. In general, a material different from the base material (support) is used.
- the thickness of the substrate to be processed or the film to be processed is not particularly limited, but it is usually preferably about 50 to 10,000 nm, more preferably 75 to 5,000 nm.
- the resin (NF-1) of Synthesis Example 1 obtained by FD-MS and GC-TOFMS (EI +) measurement has a carbon atom at the bridge head position of the fluorene skeleton as a carbon atom of another aromatic ring (fluorene ring). It was confirmed that the carbon atom of the aromatic ring of the fluorene skeleton had the following structure in which the carbon atom at the bridge head position of the other fluorene skeleton was bonded.
- the resin (NF-2) of Synthesis Example 2 obtained by FD-MS, GC-TOFMS (EI +), and LC-MS (APCI +) measurement shows that the carbon atom at the bridgehead position of the fluorene skeleton has another aromatic ring. It was confirmed that it had the following structure in which it was bonded to the carbon atom of (fluorene ring and naphthalene ring) and the carbon atom of the aromatic ring of the fluorene skeleton was bonded to the carbon atom at the bridgehead position of the other fluorene skeleton.
- Etching system RIE-10NR manufactured by Samco International Output: 50W Pressure: 20Pa Time: 2min Etching gas
- Ar gas flow rate: CF 4 gas flow rate: O 2 gas flow rate 50: 5: 5 (sccm)
- Etching resistance was evaluated according to the following procedure. First, a novolac underlayer film (reference material) was produced under the same conditions as in Example 1 except that novolak (PSM4357 manufactured by Gunei Chemical Co., Ltd.) was used instead of the phenolic resin in Example 1. Then, the above-described etching test of the novolak underlayer film was performed, and the etching rate at that time was measured. Next, the etching test of the lower layer films of Examples 1 to 3 and Comparative Example 1 was performed in the same manner, and the etching rate at that time was measured. Then, the etching resistance was evaluated according to the following evaluation criteria based on the etching rate of the novolac underlayer film.
- novolak PSM4357 manufactured by Gunei Chemical Co., Ltd.
- Acid generator Ditertiary butyl diphenyliodonium nonafluoromethanesulfonate (DTDDPI) manufactured by Midori Chemical Co., Ltd.
- Cross-linking agent Sanka Chemical Co., Ltd.
- Organic solvent cyclohexanone (CHN)
- Novolak PSM4357 manufactured by Gunei Chemical Co., Ltd.
- Example 3 the lower layer film-forming material of Example 1 (the solution prepared in Example 1) was applied onto a 300 nm thick SiO 2 substrate and baked at 240 ° C. for 60 seconds and further at 400 ° C. for 120 seconds. A lower layer film having a thickness of 80 nm was formed. On this lower layer film, an ArF resist solution was applied and baked at 130 ° C. for 60 seconds to form a 150 nm-thick photoresist layer.
- the ArF resist solution is composed of 5 parts by mass of the following formula (11), 1 part by mass of triphenylsulfonium nonafluoromethanesulfonate, 2 parts by mass of tributylamine, and 92 parts by mass of propylene glycol monomethyl ether acetate (PGMEA). What was prepared by blending the parts was used.
- the photoresist layer was subjected to mask exposure using an electron beam lithography apparatus (ELIONX, ELS-7500, 50 keV), baked at 115 ° C. for 90 seconds (PEB), and 2.38 mass% tetramethylammonium hydroxide.
- ELIONX electron beam lithography apparatus
- PEB baked at 115 ° C. for 90 seconds
- TMAH TMAH
- Example 4 the lower layer film-forming material of Example 1 (the solution prepared in Example 1) was applied onto a 300 nm thick SiO 2 substrate and baked at 240 ° C. for 60 seconds and further at 400 ° C. for 120 seconds. A lower layer film having a thickness of 80 nm was formed. On this lower layer film, a silicon-containing intermediate layer material was applied and baked at 200 ° C. for 60 seconds to form an intermediate layer film having a thickness of 35 nm. Further, the ArF resist solution used in Example 3 was applied on this intermediate layer film and baked at 130 ° C. for 60 seconds to form a 150 nm-thick photoresist layer.
- the silicon-containing intermediate layer material a silicon atom-containing polymer described in ⁇ Synthesis Example 1> of JP-A-2007-226170 was used.
- the photoresist layer was subjected to mask exposure using an electron beam lithography apparatus (ELIONX, ELS-7500, 50 keV), baked at 115 ° C. for 90 seconds (PEB), and 2.38 mass% tetramethylammonium hydroxide.
- PEB electron beam lithography apparatus
- PEB baked at 115 ° C. for 90 seconds
- TMAH aqueous solution of
- the silicon-containing intermediate layer film (SOG) was dry-etched using the obtained resist pattern as a mask, and then the obtained silicon-containing intermediate layer film pattern was A dry etching process for the lower layer film was performed using the mask as a mask, and a dry etching process for the SiO 2 film was sequentially performed using the obtained lower layer film pattern as a mask.
- Example 4 using the underlayer film of the present invention was a multilayer.
- the shape of the SiO 2 film after etching in resist processing was good.
- the resin of the present invention has a relatively high carbon concentration in the resin, a relatively high heat resistance, a relatively high solvent solubility, and a wet process can be applied. It can be used widely and effectively in applications. Therefore, the present invention provides, for example, an electrical insulating material, a resist resin, a semiconductor sealing resin, an adhesive for printed wiring boards, an electrical laminate mounted on electrical equipment / electronic equipment / industrial equipment, etc. ⁇ Matrix resin for prepregs, built-up laminate materials, resin for fiber reinforced plastics, sealing resin for liquid crystal display panels, paints, various coating agents, adhesives, and coatings for semiconductors installed in electronic equipment and industrial equipment Since it can be used widely and effectively in an agent, a resist resin for a semiconductor, a resin for forming a lower layer film, and can form a film having excellent heat resistance and etching resistance, the lower layer film for lithography and the lower layer for multilayer resist in particular. It can be used particularly effectively in the field of membranes.
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Abstract
Description
一方、リソグラフィープロセスにおける微細加工に有用で、特に集積回路素子の製造に好適な反射防止膜形成組成物として、下記式で示される構造をモノマー単位として有する重合体(アセナフテン樹脂)および溶剤を含有する反射防止膜形成組成物が公知となっている(特許文献4参照)。
しかしながら、この特許文献4の技術は、材料は高価である、アセナフテン樹脂を得るための反応条件が厳しい、反応工程が多く複雑である、などの難点がある。
現在、このようなプロセス用のレジスト下層膜として、種々のものが知られている。例えば、従来のエッチング速度の速いレジスト下層膜とは異なり、レジストに近いドライエッチング速度の選択比を持つリソグラフィー用レジスト下層膜を実現するものとして、所定のエネルギーが印加されることにより末端基が脱離してスルホン酸残基を生じる置換基を少なくとも有する樹脂成分と溶媒とを含有する多層レジストプロセス用下層膜形成材料が提案されている(特許文献5参照)。また、レジストに比べて小さいドライエッチング速度の選択比を持つリソグラフィー用レジスト下層膜を実現するものとして、特定の繰り返し単位を有する重合体を含むレジスト下層膜材料が提案されている(特許文献6参照)。さらに、半導体基板に比べて小さいドライエッチング速度の選択比を持つリソグラフィー用レジスト下層膜を実現するものとして、アセナフチレン類の繰り返し単位と、置換又は非置換のヒドロキシ基を有する繰り返し単位とを共重合してなる重合体を含むレジスト下層膜材料が提案されている(特許文献7参照)。
また、本発明の他の目的は、溶媒溶解性が比較的に高く湿式プロセスが適用可能で、例えば多層レジスト用下層膜として、耐熱性およびエッチング耐性に優れる新規なレジスト下層膜を形成するために有用な樹脂および樹脂を用いた樹脂組成物、該樹脂を用いたリソグラフィー用下層膜形成材料および下層膜形成材料、並びに、該材料を用いたパターン形成方法を提供することにある。
すなわち、本発明は、以下[1]~[19]を提供する。
[2]前記一般式(1)で示される構造が、下記一般式(2)、一般式(3)、一般式(4)及び一般式(5)で示される構造からなる群より選ばれる少なくとも一つである、上記[1]記載の樹脂。
[3]炭素濃度が80質量%以上である、上記[1]又は[2]記載の樹脂。
[5]前記触媒が、塩酸、硫酸、リン酸、シュウ酸、マロン酸、こはく酸、アジピン酸、セバシン酸、クエン酸、フマル酸、マレイン酸、蟻酸、p-トルエンスルホン酸、メタンスルホン酸、トリフルオロ酢酸、ジクロロ酢酸、トリクロロ酢酸、トリフルオロメタンスルホン酸、ベンゼンスルホン酸、ナフタレンスルホン酸、ナフタレンジスルホン酸、塩化亜鉛、塩化アルミニウム、塩化鉄、三フッ化ホウ素、ケイタングステン酸、リンタングステン酸、ケイモリブデン酸、リンモリブデン酸、臭化水素酸及びフッ酸からなる群より選ばれる少なくとも一種である、上記[4]記載の製造方法。
[6]さらに、前記原料として、下記一般式(7)、一般式(8)、一般式(9)及び一般式(10)で示される化合物からなる群より選ばれる少なくとも1種を含む、上記[4]又は[5]記載の製造方法。
[7]前記一般式(6)で示される化合物が、フルオレン、フルオレノン、フルオレノール、ベンゾフルオレン、ベンゾフルオレノン、ベンゾフルオレノール、ジベンゾフルオレン、ジベンゾフルオレノン及びジベンゾフルオレノールからなる群より選ばれる少なくとも一種である、上記[4]~[6]のいずれか一項に記載の製造方法。
[8]前記一般式(7)で示される化合物が、ベンゼン、トルエン、キシレン、トリメチルベンゼン、ナフタレン、メチルナフタレン、ジメチルナフタレン、アントラセン、メチルアントラセン及びジメチルアントラセンからなる群より選ばれる少なくとも一種である、上記[6]又は[7]記載の製造方法。
[9]前記一般式(8)で示される化合物が、フェナントレン、メチルフェナントレン及びジメチルフェナントレンからなる群より選ばれる少なくとも一種である、上記[6]~[8]のいずれか一項に記載の製造方法。
[10]前記一般式(9)で示される化合物が、フェノール、カテコール、ヒドロキノン、クレゾール、エチルフェノール、プロピルフェノール、ブチルフェノール、メチルカテコール、メチルヒドロキノン、ナフトール、ジヒドロキシナフタレン、ヒドロキシアントラセン及びジヒドロキシアントラセンからなる群より選ばれる少なくとも一種である、上記[6]~[9]のいずれか一項に記載の製造方法。
[11]前記一般式(10)で示される化合物が、ヒドロキシフェナントレン、ヒドロキシメチルフェナントレン、ジメチルヒドロキシフェナントレン及びジヒドロキシフェナントレンからなる群より選ばれる少なくとも一種である、上記[6]~[10]のいずれか一項に記載の製造方法。
[13]さらに、有機溶媒を含む、上記[12]記載の樹脂組成物。
[14]さらに、酸発生剤を含む、上記[12]又は[13]記載の樹脂組成物。
[15]さらに、架橋剤を含む上記[12]~[14]のいずれか一項に記載の樹脂組成物。
[17]上記[16]記載のリソグラフィー用下層膜形成材料から形成される、リソグラフィー用下層膜。
[18]基板上に、上記[16]記載の下層膜形成材料を用いて下層膜を形成し、該下層膜上に、少なくとも1層のフォトレジスト層を形成した後、該フォトレジスト層の所要の領域に放射線を照射し、アルカリ現像を行うことを特徴とする、パターン形成方法。
[19]基板上に、上記[16]記載の下層膜形成材料を用いて下層膜を形成し、該下層膜上に、珪素原子を含有するレジスト中間層膜材料を用いて中間層膜を形成し、該中間層膜の上に、少なくとも1層のフォトレジスト層を形成した後、該フォトレジスト層の所要の領域に放射線を照射し、アルカリ現像してレジストパターンを形成後、該レジストパターンをマスクとして前記中間層膜をエッチングし、得られた中間層膜パターンをエッチングマスクにして前記下層膜をエッチングし、得られた下層膜パターンをエッチングマスクにして基板をエッチングすることで基板にパターンを形成することを特徴とする、パターン形成方法。
本実施形態のフルオレン構造を有する樹脂は、下記一般式(1)で示される構造を有するものである。なお、本明細書中、フルオレン構造を有する樹脂とは、フルオレン骨格、ベンゾフルオレン骨格、ジベンゾフルオレン骨格のいずれかを有することを意味する。
なお、本明細書において、下記一般式(6)で示される化合物を「FL」と略すことがある。
本実施形態の樹脂組成物は前述のフルオレン構造を有する樹脂を含むものである。ここで、本実施形態の樹脂組成物は、必要に応じて有機溶媒を含んでいてもよい。また、本実施形態の樹脂組成物は、必要に応じて架橋剤や酸発生剤等の他の成分を含んでいてもよい。これら有機溶媒、架橋剤、酸発生剤等の他の成分については、以降のリソグラフィー用下層膜形成材料のところで説明するため、ここでの重複した説明は省略する。
本実施形態のリソグラフィー用下層膜形成材料は、少なくとも前述のフルオレン構造を有する樹脂及び有機溶媒を含む。
本実施形態のリソグラフィー用下層膜形成材料において、上記のフルオレン構造を有する樹脂の含有量は、特に限定されないが、有機溶媒を含む総量100質量部に対して、1~33質量部であることが好ましく、より好ましくは2~25質量部、さらに好ましくは3~20質量部である。
有機溶媒の具体例としては、例えば、アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン等のケトン系溶媒、プロピレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテルアセテート等のセロソルブ系溶媒、乳酸エチル、酢酸メチル、酢酸エチル、酢酸ブチル、酢酸イソアミル、乳酸エチル、メトキシプロピオン酸メチル、ヒドロキシイソ酪酸メチル等のエステル系溶媒、メタノール、エタノール、イソプロパノール、1-エトキシ-2-プロパノール等のアルコール系溶媒、トルエン、キシレン、アニソール等の芳香族系炭化水素等が挙げられるが、これらに特に限定されない。これらの有機溶媒は、1種を単独で或いは2種以上を組み合わせて用いることができる。
溶剤溶解性の観点から、プロピレングリコールモノメチルエーテルアセテートに対する溶解度が10質量%以上である樹脂が好適に使用される。
架橋剤の具体例としては、メラミン化合物、グアナミン化合物、グリコールウリル化合物又はウレア化合物、エポキシ化合物、チオエポキシ化合物、イソシアネート化合物、アジド化合物、アルケニルエーテル基などの2重結合を含む化合物であって、メチロール基、アルコキシメチル基、アシロキシメチル基から選ばれる少なくとも一つの基で置換されたものなどが挙げられるが、これらに特に限定されない。なお、これらの架橋剤は、1種を単独で或いは2種以上を組み合わせて用いることができる。また、これらは添加剤として用いてもよいが、これら架橋性基をポリマー側鎖にペンダント基として導入してもよい。さらに、ヒドロキシ基を含む化合物も架橋剤として用いることができる。
1)下記一般式(P1a-1)、(P1a-2)、(P1a-3)または(P1b)のオニウム塩、
2)下記一般式(P2)のジアゾメタン誘導体、
3)下記一般式(P3)のグリオキシム誘導体、
4)下記一般式(P4)のビススルホン誘導体、
5)下記一般式(P5)のN-ヒドロキシイミド化合物のスルホン酸エステル、
6)β-ケトスルホン酸誘導体、
7)ジスルホン誘導体、
8)ニトロベンジルスルホネート誘導体、
9)スルホン酸エステル誘導体
等が挙げられるが、これらに特に限定されない。なお、これらの酸発生剤は、1種を単独で或いは2種以上を組み合わせて用いることができる。
ビス(ベンゼンスルホニル)ジアゾメタン、ビス(p-トルエンスルホニル)ジアゾメタン、ビス(キシレンスルホニル)ジアゾメタン、ビス(シクロヘキシルスルホニル)ジアゾメタン、ビス(シクロペンチルスルホニル)ジアゾメタン、ビス(n-ブチルスルホニル)ジアゾメタン、ビス(イソブチルスルホニル)ジアゾメタン、ビス(sec-ブチルスルホニル)ジアゾメタン、ビス(n-プロピルスルホニル)ジアゾメタン、ビス(イソプロピルスルホニル)ジアゾメタン、ビス(tert-ブチルスルホニル)ジアゾメタン、ビス(n-アミルスルホニル)ジアゾメタン、ビス(イソアミルスルホニル)ジアゾメタン、ビス(sec-アミルスルホニル)ジアゾメタン、ビス(tert-アミルスルホニル)ジアゾメタン、1-シクロヘキシルスルホニル-1-(tert-ブチルスルホニル)ジアゾメタン、1-シクロヘキシルスルホニル-1-(tert-アミルスルホニル)ジアゾメタン、1-tert-アミルスルホニル-1-(tert-ブチルスルホニル)ジアゾメタン等のジアゾメタン誘導体、ビス-(p-トルエンスルホニル)-α-ジメチルグリオキシム、ビス-(p-トルエスルホニル)-α-ジフェニルグリオキシム、ビス-(p-トルエンスルホニル)-α-ジシクロヘキシルグリオキシム、ビス-(p-トルエンスルホニル)-2,3-ペンタンジオングリオキシム、ビス-(p-トルエンスルホニル)-2-メチル-3,4-ペンタンジオングリオキシム、ビス-(n-ブタンスルホニル)-α-ジメチルグリオキシム、ビス-(n-ブタンスルホニル)-α-ジフェニルグリオキシム、ビス-(n-ブタンスルホニル)-α-ジシクロヘキシルグリオキシム、ビス-(n-ブタンスルホニル)-2,3-ペンタンジオングリオキシム、ビス-(n-ブタンスルホニル)-2-メチル-3,4-ペンタンジオングリオキシム、ビス-(メタンスルホニル)-α-ジメチルグリオキシム、ビス-(トリフルオロメタンスルホニル)-α-ジメチルグリオキシム、ビス-(1,1,1-トリフルオロエタンスルホニル)-α-ジメチルグリオキシム、ビス-(tert-ブタンスルホニル)-α-ジメチルグリオキシム、ビス-(パーフルオロオクタンスルホニル)-α-ジメチルグリオキシム、ビス-(シクロヘキサンスルホニル)-α-ジメチルグリオキシム、ビス-(ベンゼンスルホニル)-α-ジメチルグリオキシム、ビス-(p-フルオロベンゼンスルホニル)-α-ジメチルグリオキシム、ビス-(p-tert-ブチルベンゼンスルホニル)-α-ジメチルグリオキシム、ビス-(キシレンスルホニル)-α-ジメチルグリオキシム、ビス-(カンファースルホニル)-α-ジメチルグリオキシム等のグリオキシム誘導体、
ビスナフチルスルホニルメタン、ビストリフルオロメチルスルホニルメタン、ビスメチルスルホニルメタン、ビスエチルスルホニルメタン、ビスプロピルスルホニルメタン、ビスイソプロピルスルホニルメタン、ビス-p-トルエンスルホニルメタン、ビスベンゼンスルホニルメタン等のビススルホン誘導体、2-シクロヘキシルカルボニル-2-(p-トルエンスルホニル)プロパン、2-イソプロピルカルボニル-2-(p-トルエンスルホニル)プロパン等のβ-ケトスルホン誘導体、ジフェニルジスルホン誘導体、ジシクロヘキシルジスルホン誘導体等のジスルホン誘導体、p-トルエンスルホン酸2,6-ジニトロベンジル、p-トルエンスルホン酸2,4-ジニトロベンジル等のニトロベンジルスルホネート誘導体、1,2,3-トリス(メタンスルホニルオキシ)ベンゼン、1,2,3-トリス(トリフルオロメタンスルホニルオキシ)ベンゼン、1,2,3-トリス(p-トルエンスルホニルオキシ)ベンゼン等のスルホン酸エステル誘導体、N-ヒドロキシスクシンイミドメタンスルホン酸エステル、N-ヒドロキシスクシンイミドトリフルオロメタンスルホン酸エステル、N-ヒドロキシスクシンイミドエタンスルホン酸エステル、N-ヒドロキシスクシンイミド1-プロパンスルホン酸エステル、N-ヒドロキシスクシンイミド2-プロパンスルホン酸エステル、N-ヒドロキシスクシンイミド1-ペンタンスルホン酸エステル、N-ヒドロキシスクシンイミド1-オクタンスルホン酸エステル、N-ヒドロキシスクシンイミドp-トルエンスルホン酸エステル、N-ヒドロキシスクシンイミドp-メトキシベンゼンスルホン酸エステル、N-ヒドロキシスクシンイミド2-クロロエタンスルホン酸エステル、N-ヒドロキシスクシンイミドベンゼンスルホン酸エステル、N-ヒドロキシスクシンイミド-2,4,6-トリメチルベンゼンスルホン酸エステル、N-ヒドロキシスクシンイミド1-ナフタレンスルホン酸エステル、N-ヒドロキシスクシンイミド2-ナフタレンスルホン酸エステル、N-ヒドロキシ-2-フェニルスクシンイミドメタンスルホン酸エステル、N-ヒドロキシマレイミドメタンスルホン酸エステル、N-ヒドロキシマレイミドエタンスルホン酸エステル、N-ヒドロキシ-2-フェニルマレイミドメタンスルホン酸エステル、N-ヒドロキシグルタルイミドメタンスルホン酸エステル、N-ヒドロキシグルタルイミドベンゼンスルホン酸エステル、N-ヒドロキシフタルイミドメタンスルホン酸エステル、N-ヒドロキシフタルイミドベンゼンスルホン酸エステル、N-ヒドロキシフタルイミドトリフルオロメタンスルホン酸エステル、N-ヒドロキシフタルイミドp-トルエンスルホン酸エステル、N-ヒドロキシナフタルイミドメタンスルホン酸エステル、N-ヒドロキシナフタルイミドベンゼンスルホン酸エステル、N-ヒドロキシ-5-ノルボルネン-2,3-ジカルボキシイミドメタンスルホン酸エステル、N-ヒドロキシ-5-ノルボルネン-2,3-ジカルボキシイミドトリフルオロメタンスルホン酸エステル、N-ヒドロキシ-5-ノルボルネン-2,3-ジカルボキシイミドp-トルエンスルホン酸エステル等のN-ヒドロキシイミド化合物のスルホン酸エステル誘導体等が挙げられる。
これらのなかでも、特に、トリフルオロメタンスルホン酸トリフェニルスルホニウム、トリフルオロメタンスルホン酸(p-tert-ブトキシフェニル)ジフェニルスルホニウム、トリフルオロメタンスルホン酸トリス(p-tert-ブトキシフェニル)スルホニウム、p-トルエンスルホン酸トリフェニルスルホニウム、p-トルエンスルホン酸(p-tert-ブトキシフェニル)ジフェニルスルホニウム、p-トルエンスルホン酸トリス(p-tert-ブトキシフェニル)スルホニウム、トリフルオロメタンスルホン酸トリナフチルスルホニウム、トリフルオロメタンスルホン酸シクロヘキシルメチル(2-オキソシクロヘキシル)スルホニウム、トリフルオロメタンスルホン酸(2-ノルボニル)メチル(2-オキソシクロヘキシル)スルホニウム、1,2’-ナフチルカルボニルメチルテトラヒドロチオフェニウムトリフレート等のオニウム塩、ビス(ベンゼンスルホニル)ジアゾメタン、ビス(p-トルエンスルホニル)ジアゾメタン、ビス(シクロヘキシルスルホニル)ジアゾメタン、ビス(n-ブチルスルホニル)ジアゾメタン、ビス(イソブチルスルホニル)ジアゾメタン、ビス(sec-ブチルスルホニル)ジアゾメタン、ビス(n-プロピルスルホニル)ジアゾメタン、ビス(イソプロピルスルホニル)ジアゾメタン、ビス(tert-ブチルスルホニル)ジアゾメタン等のジアゾメタン誘導体、ビス-(p-トルエンスルホニル)-α-ジメチルグリオキシム、ビス-(n-ブタンスルホニル)-α-ジメチルグリオキシム等のグリオキシム誘導体、ビスナフチルスルホニルメタン等のビススルホン誘導体、N-ヒドロキシスクシンイミドメタンスルホン酸エステル、N-ヒドロキシスクシンイミドトリフルオロメタンスルホン酸エステル、N-ヒドロキシスクシンイミド1-プロパンスルホン酸エステル、N-ヒドロキシスクシンイミド2-プロパンスルホン酸エステル、N-ヒドロキシスクシンイミド1-ペンタンスルホン酸エステル、N-ヒドロキシスクシンイミドp-トルエンスルホン酸エステル、N-ヒドロキシナフタルイミドメタンスルホン酸エステル、N-ヒドロキシナフタルイミドベンゼンスルホン酸エステル等のN-ヒドロキシイミド化合物のスルホン酸エステル誘導体が好ましく用いられる。
本実施形態のリソグラフィー用下層膜は、前述のリソグラフィー用下層膜形成材料から形成される。
このような中間層膜の上に直接フォトレジスト膜を形成してもよいが、中間層膜の上に有機反射防止膜(BARC)をスピンコートで形成して、その上にフォトレジスト膜を形成してもよい。
なお、基板は、当業界で公知のものを適宜選択して使用することができ、特に限定されないが、例えば、Si、α-Si、p-Si、SiO2、SiN、SiON、W、TiN、Al等が挙げられる。また、基板は、基材(支持体)上に被加工膜を有する積層体であってもよい。このような被加工膜としては、Si、SiO2、SiON、SiN、p-Si、α-Si、W、W-Si、Al、Cu、Al-Si等種々のLow-k膜およびそのストッパー膜等が挙げられ、通常、基材(支持体)とは異なる材質のものが用いられる。なお、加工対象となる基板或いは被加工膜の厚さは、特に限定されないが、通常、50~10,000nm程度であることが好ましく、より好ましくは75~5,000nmである。
有機元素分析により樹脂中の炭素濃度及び酸素濃度(質量%)を測定した。
装置:CHNコーダーMT-6(ヤナコ分析工業(株)製)
ゲル浸透クロマトグラフィー(GPC)分析により、ポリスチレン換算の重量平均分子量(Mw)、数平均分子量(Mn)を求め、分散度(Mw/Mn)を求めた。
装置:Shodex GPC-101型(昭和電工(株)製)
カラム:KF-80M×3
溶離液:THF 1ml/min
温度:40℃
構造分析は下記の質量分析方法を組み合わせて行った。
・FD-MS分析
MS :Jeol MS-700
Ionization :FD(+)
Scan range :10-2000
・GC-TOFMS(EI+)分析
GC :Agilent 7890A
Column :DB-5MS(φ0.25mm*30m*t0.25um)
Oven temp. :80℃(5min)-20℃/min-320℃(10min)
Inj. vol. :1ul(split ratio 1:40)
Inj. temp. :300℃
Carrier :1.0ml/min (He)
測定モード :MS
MS :Waters GCT premier
Scan range :33-700/0.2sec
Ionization :70ev(EI+)
・LC-MS(APCI+)分析
LC :Waters Acquity UPLC
Column :Waters HSS C18(φ2.1mm×100mm,df=1.8um)
Mobile phase :SolventA; H2O, SolventB; MeCN
B; 0-6min 80-100%, 6-14min 100%
Flow rate :0.5ml/min
Column temp. :40℃
Detector :UV220nm
Inj. Volume :2ul
MS :Waters MALDI-Synapt HDMS
Scan range, rate :100-1500/0.3sec
Ion mode :APCI(+)
ジムロート冷却管、温度計及び攪拌翼を備えた内容積200mlの3つ口フラスコに、窒素気流下で、フルオレン(Acros Organics社製)33g(0.2mol)を仕込み、230℃まで昇温させて12時間反応させた。反応開始直後から1時間おきにメタンスルホン酸(関東化学(株)製)2mlを計8回、反応液に加えた。その後、反応液にメチルイソブチルケトン(関東化学(株)製)80g及びアニソール(関東化学(株)製)40gを加えて希釈し、中和及び水洗を行い、溶剤を減圧下で除去することにより、目的物である合成例1の樹脂(NF-1)13gを得た。
GPC分析の結果、Mn:830、Mw:3040、Mw/Mn:3.66であった。有機元素分析の結果、炭素濃度は94.1質量%、酸素濃度は0.6質量%であった。また、FD-MS、GC-TOFMS(EI+)測定により、得られた合成例1の樹脂(NF-1)は、フルオレン骨格の橋頭位の炭素原子が他の芳香環(フルオレン環)の炭素原子と結合し、フルオレン骨格の芳香環の炭素原子が他のフルオレン骨格の橋頭位の炭素原子と結合した下記構造を有することを確認した。
ジムロート冷却管、温度計及び攪拌翼を備えた内容積1Lの四つ口フラスコに、窒素気流下で、ナフタレン(関東化学(株)製)128g(1.0mol)及び9-フルオレノン(Acros Organics社製)180g(1.0mol)を仕込み、230℃まで昇温させて8時間反応させた。反応開始直後から1時間おきにメタンスルホン酸(関東化学(株)製)2.5mlを計8回、反応液に加えた。その後、反応液にメチルイソブチルケトン(関東化学(株)製)400g及びアニソール(関東化学(株)製)200gを加えて希釈し、中和及び水洗を行い、溶剤を減圧下で除去することにより、目的物である合成例2の樹脂(NF-2)200gを得た。
GPC分析の結果、Mn:625、Mw:1971、Mw/Mn:3.15であった。有機元素分析の結果、炭素濃度は93.5質量%、酸素濃度は1.6質量%であった。また、FD-MS、GC-TOFMS(EI+)、LC-MS(APCI+) 測定により、得られた合成例2の樹脂(NF-2)は、フルオレン骨格の橋頭位の炭素原子が他の芳香環(フルオレン環及びナフタレン環)の炭素原子と結合し、フルオレン骨格の芳香環の炭素原子が他のフルオレン骨格の橋頭位の炭素原子と結合した下記の構造を有することを確認した。
ジムロート冷却管、温度計及び攪拌翼を備えた内容積1Lの四つ口フラスコに、窒素気流下で、1-ナフトール(Acros Organics社製)144g(1.0mol)及び9-フルオレノン(Acros Organics社製)180g(1.0mol)、o-トルイル酸(Aldrich社製)163gを仕込み、230℃まで昇温させて13時間反応させた。反応開始直後から1時間おきにメタンスルホン酸(関東化学(株)製)2mlを計11回、反応液に加えた。その後、反応液にメチルイソブチルケトン(関東化学(株)製)400g及びアニソール(関東化学(株)製)200gを加えて希釈し、中和及び水洗を行い、溶剤を減圧下に除去することにより、目的物である合成例3の樹脂(NF-3)294gを得た。
GPC分析の結果、Mn:540、Mw:1230、Mw/Mn:2.28であった。有機元素分析の結果、炭素濃度は89.8質量%、酸素濃度は5.5質量%であった。また、FD-MS、GC-TOFMS(EI+)、LC-MS(APCI+) 測定により、得られた合成例3の樹脂(NF-3)は、フルオレン骨格の橋頭位の炭素原子が他の芳香環(フルオレン環及びナフタレン環)の炭素原子と結合し、フルオレン骨格の芳香環の炭素原子が他のフルオレン骨格の橋頭位の炭素原子と結合した下記の構造を有することを確認した。
ジムロート冷却管、温度計及び攪拌翼を備えた内容積1Lの四つ口フラスコに、窒素気流下で、ナフタレン(関東化学(株)製)128g(1.0mol)、1-ナフトール(Acros Organics社製)144g(1.0mol)及び9-フルオレノン(Acros Organics社製)252g(1.4mol)を仕込み、230℃まで昇温させて10時間反応させた。反応中、メタンスルホン酸(関東化学(株)製)25mlを計4回に分けて、反応液に加えた。その後、反応液にメチルイソブチルケトン(関東化学(株)製)400g及びアニソール(関東化学(株)製)200gを加えて希釈し、中和及び水洗を行い、溶剤を減圧下に除去することにより、目的物である合成例4の樹脂(以下、NF-4と称する。)243gを得た。
GPC分析の結果、Mn:570、Mw:1530、Mw/Mn:2.68であった。有機元素分析の結果、炭素濃度は93.4質量%、酸素濃度は1.7質量%であった。また、FD-MS、GC-TOFMS(EI+)、LC-MS(APCI+) 測定により、得られた合成例4の樹脂(NF-4)は、フルオレン骨格の橋頭位の炭素原子が他の芳香環(フルオレン環及びナフタレン環)の炭素原子と結合し、フルオレン骨格の芳香環の炭素原子が他のフルオレン骨格の橋頭位の炭素原子と結合した下記の構造を有することを確認した。
ジムロート冷却管、温度計及び攪拌翼を備えた、底抜きが可能な内容積10Lの四つ口フラスコに、窒素気流中、1,5-ジメチルナフタレン1.09kg(7mol、三菱ガス化学(株)製)、40質量%ホルマリン水溶液2.1kg(ホルムアルデヒドとして28mol、三菱ガス化学(株)製)及び98質量%硫酸(関東化学(株)製)0.97kgを仕込み、常圧下、100℃で還流させながら7時間反応させた。その後、反応液に希釈溶媒としてエチルベンゼン(和光純薬工業(株)製試薬特級)1.8kgを加え、静置後、下相の水相を除去した。さらに、中和及び水洗を行い、エチルベンゼン及び未反応の1,5-ジメチルナフタレンを減圧下で留去することにより、淡褐色固体のジメチルナフタレンホルムアルデヒド樹脂1.25kgを得た。
GPC分析の結果、Mn:562、Mw:1168、Mw/Mn:2.08であった。有機元素分析の結果、炭素濃度は84.2質量%、酸素濃度は8.3質量%であった。
ジムロート冷却管、温度計及び攪拌翼を備えた内容積0.5Lの四つ口フラスコに、窒素気流下で、製造例1で得たジメチルナフタレンホルムアルデヒド樹脂100g(0.51mol)及びパラトルエンスルホン酸0.05gを仕込み、190℃まで昇温させて2時間加熱した後、攪拌した。その後、1-ナフトール52.0g(0.36mol)を反応液に加え、さらに220℃まで昇温させて2時間反応させた。溶剤希釈後、中和及び水洗を行い、溶剤を減圧下で除去することにより、黒褐色固体の変性樹脂(CR-1)126.1gを得た。
GPC分析の結果、Mn:885、Mw:2220、Mw/Mn:4.17であった。有機元素分析の結果、炭素濃度は89.1質量%、酸素濃度は4.5質量%であった。
表1に示す組成の下層膜形成材料を各々調製した。次に、これらの下層膜形成材料をシリコン基板上に回転塗布して、240℃で60秒間、さらに400℃で120秒間ベークして、膜厚200nmの下層膜を各々作製した。
そして、下記に示す条件でエッチング試験を行い、エッチング耐性を評価した。評価結果を表1に示す。
エッチング装置:サムコインターナショナル社製 RIE-10NR
出力:50W
圧力:20Pa
時間:2min
エッチングガス
Arガス流量:CF4ガス流量:O2ガス流量=50:5:5(sccm)
エッチング耐性の評価は、以下の手順で行った。
まず、実施例1のフェノール系樹脂に代えてノボラック(群栄化学社製 PSM4357)を用いること以外は、実施例1と同様の条件で、ノボラックの下層膜(基準材料)を作製した。そして、このノボラックの下層膜の上記のエッチング試験を行い、そのときのエッチングレートを測定した。
次に、実施例1~3及び比較例1の下層膜のエッチング試験を同様に行い、そのときのエッチングレートを測定した。
そして、ノボラックの下層膜のエッチングレートを基準として、以下の評価基準でエッチング耐性を評価した。
<評価基準>
A;ノボラックに比べてエッチングレートが、-10%未満の場合
B;ノボラックに比べてエッチングレートが、-10%~+5%の場合
C;ノボラックに比べてエッチングレートが、+5%超の場合
架橋剤 :三和ケミカル社製ニカラックMX270(ニカラック)
有機溶媒:シクロヘキサノン(CHN)
ノボラック:群栄化学社製 PSM4357
次に、実施例1の下層膜形成材料(実施例1において調製した溶液)を膜厚300nmのSiO2基板上に塗布して、240℃で60秒間、さらに400℃で120秒間ベークすることにより、膜厚80nmの下層膜を形成した。この下層膜上に、ArF用レジスト溶液を塗布し、130℃で60秒間ベークすることにより、膜厚150nmのフォトレジスト層を形成した。なお、ArFレジスト溶液は下記式(11)の化合物:5質量部、トリフェニルスルホニウムノナフルオロメタンスルホナート:1質量部、トリブチルアミン:2質量部、及びプロピレングリコールモノメチルエーテルアセテート(PGMEA):92質量部を配合して調製したものを用いた。
下層膜の形成を省略すること以外は、実施例3と同様に行い、フォトレジスト層をSiO2基板上に形成し、ポジ型のレジストパターンを得た。評価結果を、表2に示す。
表2から明らかなように、実施例3の下層膜は、比較例2に比して、解像性および感度ともに有意に優れていることが確認された。また、現像後のレジストパターン形状も良好であることが確認された。現像後のレジストパターン形状の相違から、本発明のフルオレン構造を有する樹脂は、レジスト材料との密着性が良いことが示された。
次に、実施例1の下層膜形成材料(実施例1において調製した溶液)を膜厚300nmのSiO2基板上に塗布して、240℃で60秒間、さらに400℃で120秒間ベークすることにより、膜厚80nmの下層膜を形成した。この下層膜上に、珪素含有中間層材料を塗布し、200℃で60秒間ベークすることにより、膜厚35nmの中間層膜を形成した。さらに、この中間層膜上に、実施例3で用いたArF用レジスト溶液を塗布し、130℃で60秒間ベークすることにより、膜厚150nmのフォトレジスト層を形成した。なお、珪素含有中間層材料としては、特開2007-226170号公報の<合成例1>に記載の珪素原子含有ポリマーを用いた。
次いで、電子線描画装置(エリオニクス社製;ELS-7500,50keV)を用いて、フォトレジスト層をマスク露光し、115℃で90秒間ベーク(PEB)し、2.38質量%テトラメチルアンモニウムヒドロキシド(TMAH)水溶液で60秒間現像することにより、55nmL/S(1:1)のポジ型のパターンを得た。
そして、サムコインターナショナル社製 RIE-10NRを用いて、得られたレジストパターンをマスクにして珪素含有中間層膜(SOG)のドライエッチング加工を行い、続いて、得られた珪素含有中間層膜パターンをマスクにして下層膜のドライエッチング加工と、得られた下層膜パターンをマスクにしてSiO2膜のドライエッチング加工とを順次を行った。
レジストパターンのレジスト中間層膜へのエッチング条件
出力:50W
圧力:20Pa
時間:1min
エッチングガス
Arガス流量:CF4ガス流量:O2ガス流量=50:8:2(sccm)
レジスト中間膜パターンのレジスト下層膜へのエッチング条件
出力:50W
圧力:20Pa
時間:2min
エッチングガス
Arガス流量:CF4ガス流量:O2ガス流量=50:5:5(sccm)
レジスト下層膜パターンのSiO 2 膜へのエッチング条件
出力:50W
圧力:20Pa
時間:2min
エッチングガス
Arガス流量:C5F12ガス流量:C2F6ガス流量:O2ガス流量=50:4:3:1(sccm)
上記のようにして得られた実施例4のパターン断面を、(株)日立製作所製電子顕微鏡(S-4800)を用いて観察したところ、本発明の下層膜を用いた実施例4は、多層レジスト加工におけるエッチング後のSiO2膜の形状が良好であった。
Claims (19)
- 前記一般式(1)で示される構造が、下記一般式(2)、一般式(3)、一般式(4)及び一般式(5)で示される構造からなる群より選ばれる少なくとも一つである、
請求項1記載の樹脂。 - 炭素濃度が80質量%以上である、
請求項1又は2記載の樹脂。 - 前記触媒が、塩酸、硫酸、リン酸、シュウ酸、マロン酸、こはく酸、アジピン酸、セバシン酸、クエン酸、フマル酸、マレイン酸、蟻酸、p-トルエンスルホン酸、メタンスルホン酸、トリフルオロ酢酸、ジクロロ酢酸、トリクロロ酢酸、トリフルオロメタンスルホン酸、ベンゼンスルホン酸、ナフタレンスルホン酸、ナフタレンジスルホン酸、塩化亜鉛、塩化アルミニウム、塩化鉄、三フッ化ホウ素、ケイタングステン酸、リンタングステン酸、ケイモリブデン酸、リンモリブデン酸、臭化水素酸及びフッ酸からなる群より選ばれる少なくとも一種である、
請求項4記載の製造方法。 - さらに、前記原料として、下記一般式(7)、一般式(8)、一般式(9)及び一般式(10)で示される化合物からなる群より選ばれる少なくとも1種を含む、
請求項4又は5記載の製造方法。 - 前記一般式(6)で示される化合物が、フルオレン、フルオレノン、フルオレノール、ベンゾフルオレン、ベンゾフルオレノン、ベンゾフルオレノール、ジベンゾフルオレン、ジベンゾフルオレノン及びジベンゾフルオレノールからなる群より選ばれる少なくとも一種である、
請求項4~6のいずれか一項に記載の製造方法。 - 前記一般式(7)で示される化合物が、ベンゼン、トルエン、キシレン、トリメチルベンゼン、ナフタレン、メチルナフタレン、ジメチルナフタレン、アントラセン、メチルアントラセン及びジメチルアントラセンからなる群より選ばれる少なくとも一種である、
請求項6又は7記載の製造方法。 - 前記一般式(8)で示される化合物が、フェナントレン、メチルフェナントレン及びジメチルフェナントレンからなる群より選ばれる少なくとも一種である、
請求項6~8のいずれか一項に記載の製造方法。 - 前記一般式(9)で示される化合物が、フェノール、カテコール、ヒドロキノン、クレゾール、エチルフェノール、プロピルフェノール、ブチルフェノール、メチルカテコール、メチルヒドロキノン、ナフトール、ジヒドロキシナフタレン、ヒドロキシアントラセン及びジヒドロキシアントラセンからなる群より選ばれる少なくとも一種である、
請求項6~9のいずれか一項に記載の製造方法。 - 前記一般式(10)で示される化合物が、ヒドロキシフェナントレン、ヒドロキシメチルフェナントレン、ジメチルヒドロキシフェナントレン及びジヒドロキシフェナントレンからなる群より選ばれる少なくとも一種である、
請求項6~10のいずれか一項に記載の製造方法。 - 請求項1~3のいずれか一項に記載の樹脂を含む、
樹脂組成物。 - さらに、有機溶媒を含む、
請求項12記載の樹脂組成物。 - さらに、酸発生剤を含む、
請求項12又は13記載の樹脂組成物。 - さらに、架橋剤を含む、
請求項12~14のいずれか一項に記載の樹脂組成物。 - 請求項13~15のいずれか一項に記載の樹脂組成物を含有する、
リソグラフィー用下層膜形成材料。 - 請求項16記載のリソグラフィー用下層膜形成材料から形成される、
リソグラフィー用下層膜。 - 基板上に、請求項16記載の下層膜形成材料を用いて下層膜を形成し、該下層膜上に、少なくとも1層のフォトレジスト層を形成した後、該フォトレジスト層の所要の領域に放射線を照射し、アルカリ現像を行うことを特徴とする、
パターン形成方法。 - 基板上に、請求項16記載の下層膜形成材料を用いて下層膜を形成し、該下層膜上に、珪素原子を含有するレジスト中間層膜材料を用いて中間層膜を形成し、該中間層膜の上に、少なくとも1層のフォトレジスト層を形成した後、該フォトレジスト層の所要の領域に放射線を照射し、アルカリ現像してレジストパターンを形成後、該レジストパターンをマスクとして前記中間層膜をエッチングし、得られた中間層膜パターンをエッチングマスクにして前記下層膜をエッチングし、得られた下層膜パターンをエッチングマスクにして基板をエッチングすることで基板にパターンを形成することを特徴とする、
パターン形成方法。
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Also Published As
Publication number | Publication date |
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JPWO2013047106A1 (ja) | 2015-03-26 |
CN103827163A (zh) | 2014-05-28 |
EP2762513A1 (en) | 2014-08-06 |
TW201333056A (zh) | 2013-08-16 |
JP6094947B2 (ja) | 2017-03-15 |
KR20140090144A (ko) | 2014-07-16 |
US20140246400A1 (en) | 2014-09-04 |
EP2762513A4 (en) | 2015-03-11 |
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