WO2021172295A1 - レジスト下層膜形成組成物 - Google Patents
レジスト下層膜形成組成物 Download PDFInfo
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- WO2021172295A1 WO2021172295A1 PCT/JP2021/006710 JP2021006710W WO2021172295A1 WO 2021172295 A1 WO2021172295 A1 WO 2021172295A1 JP 2021006710 W JP2021006710 W JP 2021006710W WO 2021172295 A1 WO2021172295 A1 WO 2021172295A1
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- resist underlayer
- underlayer film
- resist
- carbon atoms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0048—Photosensitive materials characterised by the solvents or agents facilitating spreading, e.g. tensio-active agents
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- 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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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
- C08G65/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols
- C08G65/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
- G03F7/0381—Macromolecular compounds which are rendered insoluble or differentially wettable using a combination of a phenolic resin and a polyoxyethylene resin
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/168—Finishing the coated layer, e.g. drying, baking, soaking
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/322—Aqueous alkaline compositions
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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
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
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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
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
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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
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
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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
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0332—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their composition, e.g. multilayer masks, materials
Definitions
- the present invention relates to a resist underlayer film forming composition, a resist underlayer film which is a fired product of a coating film made of the composition, and a method for manufacturing a semiconductor device using the composition.
- microfabrication is performed by a lithography process.
- lithography process when the resist layer on the substrate is exposed to an ultraviolet laser such as KrF excimer laser or ArF excimer laser, it is desired due to the influence of the standing wave generated due to the reflection of the ultraviolet laser on the surface of the substrate. It is known that a resist pattern having a shape is not formed. In order to solve this problem, it is adopted to provide a resist underlayer film (antireflection film) between the substrate and the resist layer. It is known that a novolak resin is used as a composition for forming a resist underlayer film.
- a lithography process is also known in which at least two resist underlayer films are formed and the resist underlayer film is used as a mask material in order to reduce the thickness of the resist layer required with the miniaturization of the resist pattern.
- the material forming at least the two layers include an organic resin (for example, acrylic resin and novolak resin), a silicon resin (for example, organopolysiloxane), and an inorganic silicon compound (for example, SiON and SiO 2 ).
- an organic resin for example, acrylic resin and novolak resin
- a silicon resin for example, organopolysiloxane
- an inorganic silicon compound for example, SiON and SiO 2 .
- Patent Document 1 describes the following formula (1):
- X 1 represents a divalent organic group having 6 to 20 carbon atoms and having at least one aromatic ring which may be substituted with a halogeno group, a nitro group, an amino group or a hydroxy group
- X 2 Represents an organic group having 6 to 20 carbon atoms or a methoxy group having at least one aromatic ring which may be substituted with a halogeno group, a nitro group, an amino group or a hydroxy group.
- the conventional resist underlayer film forming composition has improved solubility in PGME and PGMEA, which are general-purpose solvents in the semiconductor industry, reduction in the amount of sublimates that contaminate the apparatus, and coating flatness on stepped substrates and the like.
- PGME and PGMEA are general-purpose solvents in the semiconductor industry, reduction in the amount of sublimates that contaminate the apparatus, and coating flatness on stepped substrates and the like.
- the present invention solves the above problems. That is, the present invention includes the following. [1] A plurality of identical or different structural units having a methoxymethyl group and a ROCH 2 -group other than the methoxymethyl group (R is a monovalent organic group, a hydrogen atom or a mixture thereof), and the plurality of structures. A resist underlayer film forming composition containing a polymer (X) containing a linking group for linking units and a solvent.
- R is a phenyl group, may be substituted with a naphthyl group or an anthracenyl group, an oxygen atom or a carbonyl group may be interrupted, linear saturated or unsaturated or branched C 2 -C 20 aliphatic hydrocarbon groups, C 3 -C 20 alicyclic hydrocarbon group, a hydrogen atom or a mixture thereof, the resist underlayer film forming composition according to [1].
- the structural unit comprises an aromatic ring, a heterocycle, or a condensed ring which may have a phenolic hydroxyl group and may have a substituted or unsubstituted amino group.
- the resist underlayer film forming composition according to any one of the items. [5] The resist underlayer film forming composition according to any one of [1] to [4], further comprising a film material (Y) capable of crosslinking with the polymer (X). [6] The resist underlayer film forming composition according to any one of [1] to [5], further comprising a cross-linking agent.
- a step of forming a resist film on the formed resist underlayer film A step of forming a resist pattern by irradiating and developing a resist film formed with light or an electron beam.
- a method for manufacturing a semiconductor device which comprises a step of etching and patterning the resist underlayer film through the formed resist pattern, and a step of processing a semiconductor substrate through the patterned resist underlayer film.
- the process of forming a hard mask on the formed resist underlayer film The process of forming a resist film on the formed hard mask, A step of forming a resist pattern by irradiating and developing a resist film formed with light or an electron beam.
- a method for manufacturing a semiconductor device which includes a step of processing a semiconductor substrate through a film. [13] The method for manufacturing a semiconductor device according to [11] or [12], wherein the step of forming the resist underlayer film is performed by the nanoimprint method.
- the solubility in PGME and PGMEA is improved, the amount of sublimates that contaminate the apparatus is reduced, and the coating flatness on a stepped substrate or the like is improved.
- a novel resist underlayer film forming composition that meets the demand for increasing the hardness of the resist underlayer film and retains other good properties.
- the resist underlayer film forming composition according to the present invention has the same or different plurality of ROCH 2 -groups (R is a monovalent organic group, a hydrogen atom or a mixture thereof) other than the methoxymethyl group and the methoxymethyl group.
- R is a monovalent organic group, a hydrogen atom or a mixture thereof
- the structural unit of the above, a polymer (X) containing a linking group connecting the plurality of structural units, and a solvent is a polymer (X) containing a linking group connecting the plurality of structural units.
- the polymer (X) is the same or different structural units having a methoxymethyl group and a ROCH 2 -group other than the methoxymethyl group (R is a monovalent organic group, a hydrogen atom or a mixture thereof), and the above-mentioned Contains a linking group that links multiple structural units.
- the monovalent organic group R is preferably substituted with a phenyl group or a naphthyl group, an anthrasenyl group, interrupted by an oxygen atom or a carbonyl group, a saturated or unsaturated linear or branched C 2 -C 20 aliphatic hydrocarbon group, C 3 -C 20 alicyclic hydrocarbon group, or a mixture thereof.
- “Mixing” means that a plurality of ROCH 2 -groups existing in a single structural unit may be different, and the ROCH 2 -groups in each of two or more structural units are different. It also means that it is good.
- a typical saturated aliphatic hydrocarbon group is an alkyl group having 2 to 20 carbon atoms having a straight chain or a branch, and for example, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, and the like.
- a cyclic alkyl group can also be used.
- a typical unsaturated aliphatic hydrocarbon group is an alkenyl group having 2 to 20 carbon atoms, for example, an ethenyl group, a 1-propenyl group, a 2-propenyl group, a 1-methyl-1-ethenyl group, and a 1-butenyl group.
- the saturated aliphatic hydrocarbon group, unsaturated aliphatic hydrocarbon group, and cyclic alkyl group may be interrupted once or twice or more by an oxygen atom and / or a carbonyl group.
- R is -CH 2 CH 2 CH 2 CH 3 groups and -CH (CH 3 ) CH 2 OCH 3 groups.
- the polymer (X) is a compound having a methoxymethyl group and may have a phenolic hydroxyl group, and a ROCH 2 -group other than the methoxymethyl group by reacting with the methoxymethyl group (R is a monovalent organic group,
- R is a monovalent organic group
- a compound that provides a hydrogen atom or a mixture thereof and, if necessary, a compound containing a functional group as a linking group eg, aldehyde, ketone, ROCH 2- Ar-CH 2 OR (R is a monovalent organic). It can be synthesized by subjecting a group, a hydrogen atom or a mixture thereof)) to a polymerization reaction in the presence of an acid catalyst (eg, a sulfonic acid compound).
- Examples of the compound having a methoxymethyl group and optionally having a phenolic hydroxyl group used in the synthesis of the polymer (X) include 3,3', 5,5'-tetramethoxymethyl-4,4'. -Dihydroxybiphenyl can be mentioned.
- a compound that reacts with a methoxymethyl group used in the synthesis of polymer (X) to give a ROCH 2 -group other than the methoxymethyl group is a molecule.
- An organic compound having a non-phenolic hydroxyl group inside is preferable.
- Functional groups that can be chemically transformed into non-phenolic hydroxyl groups without having a non-phenolic hydroxyl group in the molecule such as alkoxy group (-OR), aldehyde group (-CHO), carboxyl group (-COOH) ), An ester group (-COOR), and an organic compound having a ketone group (-COR).
- the number of functional groups that can be chemically changed to a non-phenolic hydroxyl group or a non-phenolic hydroxyl group may be one or two or more in the molecule.
- the organic compound is an aliphatic hydrocarbon (preferably having 10 or less carbon atoms), an alicyclic hydrocarbon (preferably having 20 or less carbon atoms), or an aromatic hydrocarbon (for example, ⁇ -carbon is an aliphatic hydrocarbon. It has at least one hydroxyl group).
- propylene glycol monomethyl ether propylene glycol monomethyl ether acetate, fatty alcohols (eg n-butanol), Ar-CH 2 OH (Ar is, for example, benzene, naphthalene, anthracene, pyrene, fluorene, or m-terphenyl. ), An aldehyde, a ketone, a methylol compound and the like.
- Dioxane is not a compound that gives a ROCH 2 -group other than the methoxymethyl group (R is a monovalent organic group, a hydrogen atom, or a mixture thereof), and is also a substance harmful to the human body, so it is not used. Is preferable.
- Examples of the organic compound having an aldehyde group include aliphatic aldehydes such as formaldehyde, paraformaldehyde, butylaldehyde, and crotonaldehyde, furfural, pyridinecarboxyaldehyde, benzaldehyde, naphthylaldehyde, anthrylaldehyde, phenanthrylaldehyde, and salicylaldehyde.
- aliphatic aldehydes such as formaldehyde, paraformaldehyde, butylaldehyde, and crotonaldehyde, furfural, pyridinecarboxyaldehyde, benzaldehyde, naphthylaldehyde, anthrylaldehyde, phenanthrylaldehyde, and salicylaldehyde.
- Examples of the organic compound having a ketone group include diphenylketone, phenylnaphthylketone, dinaphthylketone, phenyltrilketone, ditrilketone, diarylketone such as 9-fluorenone, anthraquinone, and acenaphthalquinone, and 11H-benzo [b] fluorene-11.
- Spiroketones such as -one, 9H-tribenzo [a, f, l] triindene-9,14,15-trione, indeno [1,2-b] fluorene-6,12-dione can be mentioned.
- the structural unit of the polymer (X) thus obtained is preferably an aromatic ring, a heterocycle, or a condensed ring which may have a phenolic hydroxyl group and may have a substituted or unsubstituted amino group.
- the linking group for linking the plurality of structural units preferably contains an alkylene group, an ether group, or a carbonyl group.
- the compound used for the synthesis of the polymer (X) is not limited to one kind of compound, and two or more kinds of compounds may be used in combination. Therefore, a plurality of structural units having a methoxymethyl group and a ROCH 2 -group other than the methoxymethyl group (R is a monovalent organic group, a hydrogen atom or a mixture thereof) may be the same or different. May be.
- the weight average molecular weight of the polymer (X) contained in the resist underlayer film forming composition of the present invention is not particularly limited. In terms of standard polystyrene conversion value, for example, it is 1,000 or more, for example, 2,000 or more, for example, 500,000 or less, and for example, 100,000 or less.
- the resist underlayer film forming composition of the present invention can be prepared by dissolving each of the above components in an appropriate solvent, and is used in a uniform solution state.
- Such solvents include, for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol, propylene glycol monomethyl ether, propylene glycol monopropyl ether, propylene glycol monomethyl ether acetate, propylene glycol.
- a high boiling point solvent having a boiling point of 180 ° C. or higher can be used.
- the high boiling point organic solvent include 1-octanol, 2-ethylhexanol, 1-nonanol, 1-decanol, 1-undecanol, ethylene glycol, 1,2-propylene glycol, 1,3-butylene glycol, 2, 4-Pentanediol, 2-Methyl-2,4-Pentanediol, 2,5-hexanediol, 2,4-Heptanediol, 2-ethyl-1,3-hexanediol, diethylene glycol, dipropylene glycol, triethylene glycol , Tripropylene glycol, glycerin, n-nonyl acetate, ethylene glycol monohexyl ether, ethylene glycol mono-2-ethylhexyl ether, ethylene glycol monophenyl ether, ethylene glycol mono
- the proportion of the solid content obtained by removing the organic solvent from the composition is, for example, 0.5% by mass to 30% by mass, preferably 0.8% by mass to 15% by mass.
- R 1 , R 2 and R 3 in the formula (i) represent alkyl groups having 1 to 20 carbon atoms which may be interrupted by hydrogen atoms, oxygen atoms, sulfur atoms or amide bonds, respectively, and are identical to each other. They may be present or different, and may be combined with each other to form a ring structure.
- alkyl group having 1 to 20 carbon atoms examples include a linear or branched alkyl group having or not having a substituent, for example, a methyl group, an ethyl group, and an n-propyl group.
- a substituent for example, a methyl group, an ethyl group, and an n-propyl group.
- An alkyl group having 1 to 12 carbon atoms is preferable, an alkyl group having 1 to 8 carbon atoms is more preferable, and an alkyl group having 1 to 4 carbon atoms is more preferable.
- Oxygen atom, the alkyl group of a sulfur atom or an amide interrupted by coupling a 1 to 20 carbon atoms for example, structural units -CH 2 -O -, - CH 2 -S -, - CH 2 -NHCO- or - Those containing CH 2- CONH- can be mentioned.
- -O-, -S-, -NHCO- or -CONH- may be one unit or two or more units in the alkyl group.
- alkyl groups having 1 to 20 carbon atoms interrupted by -O-, -S-, -NHCO- or -CONH- units include methoxy group, ethoxy group, propoxy group, butoxy group, methylthio group and ethylthio.
- methyl group an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a dodecyl group or an octadecyl group, each of which is a methoxy group or an ethoxy group.
- the compound represented by (i) is preferable, and 3-methoxy-N, N-dimethylpropionamide and N, N-dimethylisobutyramide are particularly preferable as the compound represented by the formula (i).
- solvents can be used alone or in combination of two or more.
- these solvents those having a boiling point of 160 ° C. or higher are preferable, and propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethyl lactate, butyl lactate, cyclohexanone, 3-methoxy-N, N-dimethylpropionamide, N, N-Dimethylisobutyramide, 2,5-dimethylhexane-1,6-diyldiacetate (DAH; cas, 89182-68-3), and 1,6-diacetoxyhexane (cas, 6222-17-9), etc.
- DASH 2,5-dimethylhexane-1,6-diyldiacetate
- cas, 89182-68-3 1,6-diacetoxyhexane
- cas, 6222-17-9 1,6-diacetoxyhexane
- the resist underlayer film forming composition of the present invention may further contain at least one of a cross-linking agent, an acid and / or an acid generator, a thermoacid generator and a surfactant as optional components.
- the resist underlayer film forming composition of the present invention can further contain a cross-linking agent.
- a cross-linking agent a cross-linking compound having at least two cross-linking substituents is preferably used. Examples thereof include melamine compounds, substituted urea compounds and phenol compounds having crosslink-forming substituents such as methylol groups and methoxymethyl groups, or polymer compounds thereof.
- the substituted urea-based compound include compounds such as methoxymethylated urea, butoxymethylated urea, and methoxymethylated thiourea, and examples thereof include tetramethoxymethylurea and tetrabutoxymethylurea.
- a condensate of these compounds can also be used.
- the phenolic compound include tetrahydroxymethylbiphenol, tetramethoxymethylbiphenol, tetrahydroxymethylbisphenol, tetramethoxymethylbisphenol, and compounds represented by the following formulas.
- a compound having at least two epoxy groups can also be used.
- examples of such compounds include tris (2,3-epoxypropyl) isocyanurate, 1,4-butanediol diglycidyl ether, 1,2-epoxy-4- (epoxyethyl) cyclohexane, glycerol triglycidyl ether, and diethylene glycol.
- an epoxy resin having an amino group can also be used. Examples of such an epoxy resin include YH-434 and YH-434L (manufactured by Shin-Nippon Epoxy Manufacturing Co., Ltd.).
- a compound having at least two blocked isocyanate groups can also be used.
- examples of such a compound include Takenate [registered trademark] B-830 and B-870N manufactured by Mitsui Chemicals, Inc., and VESTANAT [registered trademark] B1358 / 100 manufactured by Evonik Degussa.
- a compound having at least two vinyl ether groups can also be used.
- examples of such compounds include bis (4- (vinyloxymethyl) cyclohexylmethyl) glutarate, tri (ethylene glycol) divinyl ether, adipate divinyl ester, diethylene glycol divinyl ether, 1,2,4-tris (4-vinyl).
- a cross-linking agent having high heat resistance can be used.
- a compound containing a cross-linking substituent having an aromatic ring (for example, a benzene ring or a naphthalene ring) in the molecule can be preferably used.
- Examples of this compound include a compound having a partial structure of the following formula (4) and a polymer or oligomer having a repeating unit of the following formula (5).
- the above R 11 , R 12 , R 13 and R 14 are hydrogen atoms or alkyl groups having 1 to 10 carbon atoms, and these alkyl groups can use the above-mentioned examples.
- n1 is an integer of 1 to 4
- n2 is an integer of 1 to (5-n1)
- (n1 + n2) is an integer of 2 to 5.
- n3 is an integer of 1 to 4
- n4 is 0 to (4-n3)
- (n3 + n4) is an integer of 1 to 4.
- Oligomers and polymers can be used in the range of 2 to 100 or 2 to 50 repeating unit structures.
- the above compounds can be obtained as products of Asahi Organic Materials Industry Co., Ltd. and Honshu Chemical Industry Co., Ltd.
- the compound of formula (4-23) is Honshu Chemical Industry Co., Ltd., trade name TMOM-BP
- the compound of formula (4-24) is Asahi Organic Materials Industry Co., Ltd., trade name TM. -As BIP-A
- the compound of formula (4-28) is available under Finechem, Inc., trade name PGME-BIP-A.
- the amount of the cross-linking agent added varies depending on the coating solvent used, the substrate used, the required solution viscosity, the required film shape, etc., but is 0.001% by mass or more and 0.01% by mass with respect to the total solid content. % Or more, 0.05% by mass or more, 0.5% by mass or more, or 1.0% by mass or more, 80% by mass or less, 50% by mass or less, 40% by mass or less, 20% by mass or less, or 10% by mass. % Or less.
- These cross-linking agents may cause a cross-linking reaction by self-condensation, but if cross-linking substituents are present in the polymer of the present invention, they can cause a cross-linking reaction with those cross-linking substituents.
- One type selected from these various cross-linking agents may be added, or two or more types may be added in combination.
- the resist underlayer film forming composition according to the present invention may contain an acid and / or an acid generator.
- Examples of the acid include p-toluene sulfonic acid, trifluoromethane sulfonic acid, pyridinium p-toluene sulfonic acid, pyridinium phenol sulfonic acid, salicyl acid, 5-sulfosalicylic acid, 4-phenol sulfonic acid, camphor sulfonic acid, 4-chlorobenzene sulfonic acid.
- Benzindisulfonic acid 1-naphthalenesulfonic acid, citric acid, benzoic acid, hydroxybenzoic acid, naphthalenecarboxylic acid and other carboxylic acid compounds and inorganic acids such as hydrochloric acid, sulfuric acid, nitrate and phosphoric acid. Only one type of acid can be used, or two or more types can be used in combination.
- the blending amount is usually 0.0001 to 20% by mass, preferably 0.0005 to 10% by mass, and more preferably 0.01 to 5% by mass with respect to the total solid content.
- thermoacid generator examples include 2,4,4,6-tetrabromocyclohexadienone, benzointosylate, 2-nitrobenzyltosylate, K-PURE® CXC-1612, CXC-1614, and TAG.
- sulfoneimide compound examples include N- (trifluoromethanesulfonyloxy) succinimide, N- (nonafluoronormal butanesulfonyloxy) succinimide, N- (kanfersulfonyloxy) succinimide and N- (trifluoromethanesulfonyloxy) naphthalimide. Can be mentioned.
- disulfonyldiazomethane compound examples include bis (trifluoromethylsulfonyl) diazomethane, bis (cyclohexylsulfonyl) diazomethane, bis (phenylsulfonyl) diazomethane, bis (p-toluenesulfonyl) diazomethane, and bis (2,4-dimethylbenzenesulfonyl).
- Diazomethane methylsulfonyl-p-toluenesulfonyldiazomethane and the like.
- the ratio thereof is 0.01 to 10 parts by mass, 0.1 to 8 parts by mass, or 0.% by mass with respect to 100 parts by mass of the solid content of the resist underlayer film forming composition. It is 5 to 5 parts by mass.
- the resist underlayer film forming composition of the present invention can further contain a surfactant.
- a surfactant include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, and polyoxyethylene oleyl ether, polyoxyethylene octylphenyl ether, and polyoxy.
- Polyoxyethylene alkylaryl ethers such as ethylene nonylphenyl ether, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan Polysorbate fatty acid esters such as tristearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbitan tristearate, etc.
- Nonionic surfactants such as polyoxyethylene sorbitan fatty acid esters, Ftop [registered trademarks] EF301, EF303, EF352 (manufactured by Mitsubishi Materials Electronics Co., Ltd.), Megafuck [registered trademarks] F171, F173, R-30, R-30-N, R-40, R-40-LM (manufactured by DIC Co., Ltd.), Florard FC430, FC431 (manufactured by Sumitomo 3M Co., Ltd.), Asahi Guard [registered trademark] ] AG710, Surflon [registered trademark] S-382, SC101, SC102, SC103, SC104, SC105, SC106 (manufactured by Asahi Glass Co., Ltd.) and other fluorine-based surfactants, organosiloxane polymer KP341 (Shinetsu) (Made by Chemical Industry Co., Ltd.) can be mentioned.
- Ftop EF301,
- One kind selected from these surfactants may be added, or two or more kinds may be added in combination.
- the content ratio of the surfactant is, for example, 0.01% by mass to 5% by mass with respect to the solid content of the resist underlayer film forming composition of the present invention excluding the solvent described later.
- the polymer (X) according to the present invention can also be used as a cross-linking agent for the membrane material (Y). That is, the resist underlayer film forming composition according to the present invention further contains a film material (Y) capable of cross-linking with the polymer (X). It can be said that the membrane material (Y) is a membrane material capable of cross-linking with the polymer (X).
- the membrane material (Y) optionally used in the present invention can be used without particular limitation as long as it is a material capable of cross-linking with the polymer (X).
- the membrane material may be a polymer, an oligomer, or a small molecule compound having a molecular weight of 1,000 or less.
- Examples of the crosslink-forming group present in the film material include, but are not limited to, a hydroxy group, a carboxyl group, an amino group, and an alkoxy group.
- Examples of the film material capable of cross-linking (a) include an alicyclic epoxy polymer having a repeating structural unit represented by the following formula (1), as disclosed in WO 2011/021555 A1.
- T represents a repeating unit structure having an aliphatic ring in the main chain of the polymer
- E represents an epoxy group or an organic group having an epoxy group.
- E is a substituent to the aliphatic ring, and either the epoxy group is directly bonded to the aliphatic group or the organic group having the epoxy group (for example, a glycidyl group) is bonded to the aliphatic group.
- the aliphatic ring is, for example, a ring in which 4 to 10 carbon atoms are linked in a ring shape, and in particular, a ring in which 6 carbon atoms are linked in a ring shape.
- the aliphatic ring can have other substituents in addition to the substituent E (epoxy group or organic group having an epoxy group).
- the alicyclic epoxy polymer represented by the above formula (1) has a weight average molecular weight of 600 to 1,000,000, preferably 1,000 to 200,000.
- the number of repeating units of the alicyclic epoxy polymer (A) represented by the above formula (1) is 2 to 3,000 or 3 to 600.
- R 1 is independently an alkyl group containing 1 to 10 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aromatic hydrocarbon group, a halogen atom, a nitro group or an amino group
- R 2 independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an acetal group, an acyl group or a glycidyl group
- R 3 has a substituent.
- R 4 represents a hydrogen atom, a phenyl group or a naphthyl group, and when R 3 and R 4 bonded to the same carbon atom each represent a phenyl group, they are bonded to each other to form a fluorene ring. It may be formed, wherein (1b) two atoms or groups groups and two R 4 where R 3 represents represents in may be different from each other, the two k each independently represent 0 or 1, m Represents an integer of 3 to 500, n, n 1 and n 2 represent an integer of 2 to 500, p represents an integer of 3 to 500, X represents a single bond or a hetero atom, and two Qs represent respectively.
- the aromatic hydrocarbon group represented by R 3 is a phenyl group, a naphthyl group, an anthryl group or a pyrenyl group.
- R 1 and R 2 are a hydrogen atom, a halogen group, a nitro group, an amino group, a hydroxy group, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, and an aryl having 6 to 40 carbon atoms, respectively.
- the alkyl group, the alkenyl group or the aryl group represents a group which may contain an ether bond, a ketone bond or an ester bond.
- R 3 is selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, and a combination thereof.
- the alkyl group, the alkenyl group or the aryl group represents a group which may contain an ether bond, a ketone bond or an ester bond.
- R 4 represents an aryl group or heterocyclic group having 6 to 40 carbon atoms which may be substituted with a halogen group, a nitro group, an amino group or a hydroxy group.
- R 5 contains an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, or a heterocyclic group which may be substituted with a hydrogen atom, a halogen group, a nitro group, an amino group or a hydroxy group. Represented, and R 4 and R 5 may be combined with the carbon atoms to which they are attached to form a ring.
- n1 and n2 are integers of 1 to 3, respectively.
- R 1 , R 2 , R 3 and R 5 each represent a hydrogen atom
- R 4 is a polymer containing a unit structure representing a phenyl group or a naphthyl group.
- R 1 , R 2 and R 3 represent hydrogen atoms, respectively, and R 4 and R 5 together with the carbon atoms to which they are attached form a fluorene ring.
- the polymer according to claim 1, wherein the carbon atom contains a unit structure which is a carbon atom at the 9-position of the formed fluorene ring.
- R 1 , R 2 , R 6 , R 7 and R 8 are hydrogen atom, halogen group, nitro group, amino group, hydroxy group, alkyl group with 1 to 10 carbon atoms, and alkenyl with 2 to 10 carbon atoms, respectively. It is selected from the group consisting of a group, an aryl group having 6 to 40 carbon atoms, and a combination thereof, and the alkyl group, the alkenyl group or the aryl group contains an ether bond, a ketone bond or an ester bond.
- R 3 is selected from the group consisting of hydrogen atoms, alkyl groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, aryl groups having 6 to 40 carbon atoms, and combinations thereof, and said The alkyl group, the alkenyl group or the aryl group represents a group which may contain an ether bond, a ketone bond or an ester bond.
- R 4 represents an aryl group or heterocyclic group having 6 to 40 carbon atoms which may be substituted with a halogen group, a nitro group, an amino group or a hydroxy group.
- R 5 contains an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, or a heterocyclic group which may be substituted with a hydrogen atom, a halogen group, a nitro group, an amino group or a hydroxy group. Represented, and R 4 and R 5 may be combined with the carbon atoms to which they are attached to form a ring.
- n1 and n2 are integers of 1 to 3, respectively, and are n3 to n5 are integers of 1 to 4, respectively. ) Is a polymer containing a unit structure.
- R 1 , R 2 , R 3 , R 5 , R 6 , R 7 and R 8 represent hydrogen atoms, respectively
- R 4 is a phenyl group.
- it is a polymer containing a unit structure representing a naphthyl group.
- Examples of the film material capable of the cross-linking reaction include a polymer containing a unit structure composed of a reaction product of a condensed heterocyclic compound and a bicyclocyclic compound, as disclosed in WO 2013/005797 A1.
- the condensed heterocyclic compound is a carbazole compound or a substituted carbazole compound.
- the bicyclocyclic compound is dicyclopentadiene, substituted dicyclopentadiene, tetracyclo [4.4.0.1 2,5 . 17 and 10 ] Dodeca-3,8-diene, or substituted tetracyclo [4.4.0.1 2,5 . 17 and 10 ] Dodeca-3,8-diene.
- the polymer is a polymer containing a unit structure represented by the following formula (1), a unit structure represented by the formula (2), a unit structure represented by the formula (3), or a combination thereof.
- R 1 to R 14 are substituents of hydrogen atoms, and the number of carbon atoms 1 to 10 which may be independently substituted with a halogen group, a nitro group, an amino group or a hydroxy group, or those groups, respectively.
- Ar is an aromatic ring group having 6 to 40 carbon atoms
- n 1 , n 2 , n 5 , n 6 , n 9 , n 10 , n 13 , n 14 and n 15 are integers of 0 to 3, respectively
- n 3 , n 4 , n 7 , n 8 , n 11 and n 12 are integers of 0 to 4, respectively.
- Ar is a phenyl group or a naphthyl group in the above formula (3).
- (E) As a membrane material capable of a cross-linking reaction, the formula (1): as disclosed in WO 2012/176767 A1: (In the formula (1), A is a hydroxy group-substituted phenylene group derived from polyhydroxybenzene, and B is a monovalent condensed aromatic hydrocarbon ring group in which 2 to 4 benzene rings are condensed.) Examples include polymers containing unit structures.
- A is a hydroxy group-substituted phenylene group derived from benzenediol or benzenetriol.
- A is a hydroxy group substituted phenylene group derived from catechol, resorcinol, hydroquinone, pyrogallol, hydroxyquinol, or phloroglucinol.
- the fused aromatic hydrocarbon ring group of B is a naphthalene ring group, an anthracene ring group, or pyrene ring group.
- the condensed aromatic hydrocarbon ring group of B has a halogen group, a hydroxyl group, a nitro group, an amino group, a carboxyl group, a carboxylic acid ester group, a ditryl group, or a combination thereof as a substituent.
- the alkenyl group and the aryl group represent an organic group which may contain an ether bond, a ketone bond, or an ester bond.
- R 3 is selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, and a combination thereof.
- the alkyl group, the alkenyl group and the aryl group represent an organic group which may contain an ether bond, a ketone bond, or an ester bond.
- R 4 is selected from the group consisting of an aryl group having 6 to 40 carbon atoms and a heterocyclic group, and the aryl group and the heterocyclic group are a halogen group, a nitro group, an amino group and 1 to 10 carbon atoms.
- R 5 is selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, and a heterocyclic group, and the alkyl group, the aryl group and the heterocyclic ring.
- the group represents an organic group that may be substituted with a halogen group, a nitro group, an amino group, or a hydroxyl group, and R 4 and R 5 form a ring together with the carbon atom to which they are attached. May be good.
- n1 and n2 are integers of 0 to 3, respectively. ), Examples of the polymer containing the unit structure (A).
- R 5 of the above formula (1) is a hydrogen atom
- R 4 may be substituted with a phenyl group, a naphthyl group, an anthryl group, or a pyrenyl group.
- R 3 of the above formula (1) is a hydrogen atom or a phenyl group.
- Ar 1 and Ar 2 include a unit structure (a1) in which one is a benzene ring and the other is a naphthalene ring.
- Ar 1 and Ar 2 include a unit structure (a2) in which both are benzene rings.
- a copolymer containing a unit structure (a1) and a unit structure (a2) is preferable.
- the unit structure (A) of the formula (1) and the unit structure (B) of the following formula (2) are:
- R 6 is selected from the group consisting of an aryl group having 6 to 40 carbon atoms and a heterocyclic group, and the aryl group and the heterocyclic group are a halogen group, a nitro group and an amino group.
- R 7 is selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, and a heterocyclic group, and the alkyl group, the aryl group and the complex.
- the ring group represents an organic group that may be substituted with a halogen group, a nitro group, an amino group, or a hydroxyl group, and R 6 and R 7 form a ring together with the carbon atom to which they are bonded. It may be a copolymer containing.). Preferably, it is a copolymer containing a unit structure (a1) and a unit structure (B).
- R 1 , R 2 and R 3 are substituents of the hydrogen atom of the ring, and each of them independently has a halogen group, a nitro group, an amino group, a hydroxyl group and an alkyl having 1 to 10 carbon atoms.
- R 4 is a hydrogen atom and a carbon number of carbon atoms.
- R 5 is an alkyl group of 1 to 10, an alkenyl group of 2 to 10 carbon atoms, an aryl group of 6 to 40 carbon atoms, or a combination thereof which may contain an ether bond, a ketone bond, or an ester bond.
- a hydrogen atom, or a halogen group, a nitro group, an amino group, a formyl group, a carboxyl group, a carboxylic acid alkyl ester group, a phenyl group, an alkoxy group having 1 to 10 carbon atoms, or a hydroxyl group may be substituted with 6 to 6 carbon atoms.
- R 6 is a hydrogen atom or a carbon optionally substituted with a halogen group, a nitro group, an amino group, a formyl group, a carboxyl group, a carboxylic acid alkyl ester group, or a hydroxyl group.
- R 5 and R 6 may form a ring together with the carbon atoms to which they are attached
- Rings A and B each represent a benzene ring, a naphthalene ring, or an anthracene ring.
- N1, n2, and n3 are each equal to or greater than 0 and are integers up to the maximum number that can be replaced with a ring. Examples thereof include polymers having a unit structure.
- both ring A and ring B are benzene rings, n1, n2, and n3 are 0, and R 4 is a hydrogen atom.
- R 5 is a hydrogen atom, or a halogen group, a nitro group, an amino group, a formyl group, a carboxyl group, a carboxylic acid alkyl ester group, a phenyl group, substituted alkoxy group having 1 to 10 carbon atoms, or a hydroxyl group Is also a good phenyl, naphthyl, anthryl, or pyrenyl group, with R 6 being the hydrogen atom.
- Examples of the membrane material capable of the cross-linking reaction include the following formulas (1a), (1b) and (1c): as disclosed in WO 2014/129582 A1.
- two R 1 is independently an alkyl group containing 1 to 10 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aromatic hydrocarbon group, a halogen atom, a nitro group or an amino group
- R 2 independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an acetal group, an acyl group or a glycidyl group
- R 3 has a substituent.
- R 4 represents a hydrogen atom, a phenyl group or a naphthyl group, and when R 3 and R 4 bonded to the same carbon atom each represent a phenyl group, they are bonded to each other to form a fluorene ring. It may be formed, wherein (1b) two atoms or groups groups and two R 4 where R 3 represents represents in may be different from each other, the two k each independently represent 0 or 1, m Represents an integer of 3 to 500, n, n 1 and n 2 represent an integer of 2 to 500, p represents an integer of 3 to 500, X represents a single bond or a hetero atom, and two Qs represent respectively.
- the aromatic hydrocarbon group represented by R 3 is a phenyl group, a naphthyl group, an anthryl group or a pyrenyl group.
- R 1 to R 4 each independently represent a hydrogen atom or a methyl group.
- X 1 contains at least one arylene group which may be substituted with an alkyl group, an amino group, or a hydroxyl group. Examples thereof include polymers containing a unit structure represented by (indicating a divalent organic group).
- the arylene group is a phenylene group in the definition of X 1, biphenylene group, terphenylene group, fluorenylene group, a naphthylene group, anthrylene group, pyrenylene group, or a carbazolylene group.
- X 1 is the formula (2): [In formula (2), A 1 represents a phenylene group or a naphthylene group. A 2 is a phenylene group, a naphthylene group, or a formula (3): (In the formula (3), A 3 and A 4 independently represent a phenylene group or a naphthylene group. The dotted line represents a bond). The dotted line represents the bond. ] Is an organic group.
- a secondary carbon atom or a third carbon atom of the aromatic compound (A) and an alkyl group having 2 to 26 carbon atoms as disclosed in WO 2017/069063 A1.
- examples thereof include a novolak resin obtained by reacting with an aldehyde (B) having a formyl group bonded to a class carbon atom.
- the novolak resin has the following formula (1): (In the formula (1), A represents a divalent group derived from an aromatic compound having 6 to 40 carbon atoms, b 1 represents an alkyl group having 1 to 16 carbon atoms, and b 2 is a hydrogen atom or It contains an alkyl group having 1 to 9 carbon atoms) represented by a unit structure.
- A is a divalent group derived from an aromatic compound containing an amino group, a hydroxyl group, or both.
- A is a divalent group derived from an aromatic compound containing an arylamine compound, a phenol compound, or both.
- A is a divalent derived from aniline, diphenylamine, phenylnaphthylamine, hydroxydiphenylamine, carbazole, phenol, N, N'-diphenylethylenediamine, N, N'-diphenyl-1,4-phenylenediamine, or polynuclear phenol. It is the basis.
- the polynuclear phenol is dihydroxybenzene, trihydroxybenzene, hydroxynaphthalene, dihydroxynaphthalene, trihydroxynaphthalene, tris (4-hydroxyphenyl) methane, tris (4-hydroxyphenyl) ethane, 2,2'-biphenol, or 1 , 1,2,2-tetrakis (4-hydroxyphenyl) ethane.
- the novolak resin has the following formula (2): (In the formula (2), a 1 and a 2 represent a benzene ring or a naphthalene ring which may be substituted, respectively, and R 1 is a secondary amino group or a tertiary amino group, which may be substituted carbon.
- divalent hydrocarbon radical having the number of atoms of 1 to 10, .b 3 showing an arylene group, or a divalent group in which these groups are optionally bound represents an alkyl group having 1 to 16 carbon atoms
- b 4 is hydrogen It contains a unit structure represented by an atom or an alkyl group having 1 to 9 carbon atoms.).
- R 1 is independently an alkyl group containing 1 to 10 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aromatic hydrocarbon group, a halogen atom, a nitro group or an amino group
- the two R 2 each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, an alkenyl group, an acetal group of 2 to 6 carbon atoms, an acyl group or a glycidyl group
- R 3 represents an aromatic hydrocarbon group or heterocyclic group which may have a substituent
- R 4 represents a hydrogen atom, a phenyl group or a naphthyl group
- R 3 and R 4 bonded to the same carbon atom are phenyl, respectively.
- fluorene ring When representing a group, they may be combined with each other to form a fluorene ring, where two k independently represent 0 or 1, m represents an integer of 3 to 500, and p represents an integer of 3 to 500.
- X represents a benzene ring, and the two -C (CH 3 ) 2 -groups bonded to the benzene ring have a meta-position or a para-position relationship.
- Examples thereof include polymers having a repeating structural unit represented by.
- the polymer is a polymerization reaction product of at least one bisphenol compound and at least one aromatic aldehyde or aromatic ketone.
- the aromatic hydrocarbon group represented by R 3 is a phenyl group, a naphthyl group, an anthryl group or a pyrenyl group.
- Examples of the film material capable of the cross-linking reaction include a poly (epoxide) resin having an epoxy functional value of more than 2.0 and less than 10 as disclosed in JP-A-11-511194.
- the poly (epoxide) resin is selected from the group consisting of bisphenol A-epichlorohydrin resin products, epoxy novolacs, o-cresol epoxy novolacs, polyglycidyl ethers, polyglycidyl amines, alicyclic epoxides and polyglycidyl esters. Will be done.
- the poly (epoxide) resin has an epoxy functional value greater than 3.5.
- Examples of the membrane material or novolak membrane material capable of cross-linking reaction include a compound represented by the following formula (1) and a novolac membrane material as disclosed in WO 2018/198960 A1.
- X 1 represents -N (R 1 )-or -CH (R 1 )-.
- X 2 represents -N (R 2 )-or -CH (R 2 )-.
- R 1 , R 2 , R 3 and R 4 are the same or different, respectively, hydrogen atom, linear, branched or cyclic alkyl group of C1 to 20, aryl group of C6 to 20, alkoxy group of C2 to 10, respectively.
- the alkyl group and the aryl group are an acyl group of C1 to 6, an alkoxy group of C1 to 6, an alkoxycarbonyl group of C1 to 6, an amino group, a glycidyl group or It may be substituted with a hydroxy group and may be interrupted by an oxygen atom or a sulfur atom.
- R 5 , R 6 , R 9 and R 10 are the same or different, respectively, hydrogen atom, hydroxy group, acyl group of C1 to 6, alkoxy group of C1 to 6, alkoxycarbonyl group of C1 to 6, direct of C1 to 10, respectively.
- the alkoxy group and the alkoxy group may have one or more groups selected from the group consisting of an amino group, a nitro group, a cyano group, a hydroxy group, a glycidyl group and a carboxyl group.
- R 7 and R 8 are the same or different and represent a benzene ring or a naphthalene ring, respectively.
- n and o are 0 or 1.
- R 1 , R 2 , R 3 or R 4 of the formula (1) may be substituted with a hydroxy group or a hydroxy group, and may be interrupted by an oxygen atom or a sulfur atom. 20 linear, branched or cyclic alkyl groups.
- Equation (2) Represents a single bond or a double bond
- X 1 represents -N (R 1 )-, -CH (R 1 )-, -N ⁇ or -CH ⁇
- X 2 represents -N (R 2 )-, -CH (R 2 )-, -N ⁇ or -CH ⁇
- R 1 , R 2 , R 3 and R 4 are the same or different, respectively, hydrogen atom, linear, branched or cyclic alkyl group of C1 to 20, aryl group of C6 to 20, alkoxy group of C2 to 10, respectively.
- R 5 , R 6 , R 9 and R 10 are the same or different, respectively, hydrogen atom, hydroxy group, acyl group of C1 to 6, alkoxy group of C1 to 6, alkoxycarbonyl group of C1 to 6, direct of C1 to 10, respectively.
- the alkoxy group and the alkoxy group may have one or more groups selected from the group consisting of an amino group, a nitro group, a cyano group, a hydroxy group, a glycidyl group and a carboxyl group.
- R 7 and R 8 are the same or different and represent a benzene ring or a naphthalene ring, respectively.
- n and o are 0 or 1
- B 1 and B 2 are the same or different and may be interrupted by hydrogen, oxygen or sulfur atoms, respectively, C1-20 linear, branched or cyclic alkyl groups or C6-40 aryl groups and C6.
- the hydrogen atom of the compound-derived group is substituted with an alkyl group, a phenyl group, a fused ring group, a heterocyclic group, a hydroxy group, an amino group, an ether group, an alkoxy group, a cyano group, a nitro group or a carboxyl group of C1 to 20. May be. ]
- Equation (3) Represents a single bond or a double bond
- X 1 represents -N ⁇ or -CH ⁇
- X 2 represents -N ⁇ or -CH ⁇
- R 3 and R 4 are the same or different, respectively, hydrogen atom, linear, branched or cyclic alkyl group of C1 to 20, aryl group of C6 to 20, alkoxy group of C2 to 10, alkoxy group of C2 to 10, respectively.
- the carboxyl group or the cyano group, and the alkyl group and the aryl group are substituted with an acyl group of C1 to 6, an alkoxy group of C1 to 6, an alkoxycarbonyl group of C1 to 6, an amino group, a glycidyl group or a hydroxy group. It may be interrupted by an oxygen atom or a sulfur atom, and may be interrupted.
- R 5 , R 6 , R 9 and R 10 are the same or different, respectively, hydrogen atom, hydroxy group, acyl group of C1 to 6, alkoxy group of C1 to 6, alkoxycarbonyl group of C1 to 6, direct of C1 to 10, respectively.
- the alkoxy group and the alkoxy group may have one or more groups selected from the group consisting of an amino group, a nitro group, a cyano group, a hydroxy group, a glycidyl group and a carboxyl group.
- R 7 and R 8 are the same or different and represent a benzene ring or a naphthalene ring, respectively.
- n and o are 0 or 1
- p and q are integers from 0 to 20
- the p methylene group and the q methylene group may be interrupted by an oxygen atom or a sulfur atom when there are two or more.
- B 3 is directly bonded or substituted with an alkyl group, a phenyl group, a fused ring group, a heterocyclic group, a hydroxy group, an amino group, an ether group, an alkoxy group, a cyano group, a nitro group or a carboxyl group of C1 to 20. It represents a group derived from a good C6-40 aromatic compound.
- R 1 , R 2 , R 3 or R 4 of the formula (1) may be substituted with a hydroxy group or a hydroxy group, and may be interrupted by an oxygen atom or a sulfur atom. 20 linear, branched or cyclic alkyl groups.
- a 1 , A 2 , A 3 , A 4 , A 5 and A 6 represent a hydrogen atom, a methyl group or an ethyl group, respectively, and X 1 represents the formula (2), the formula (3), respectively. Equation (4) or Equation (5):
- R 1 and R 2 represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 3 to 6 carbon atoms, a benzyl group or a phenyl group, respectively, and the phenyl group is carbon. Substituted with a group selected from the group consisting of an alkyl group having 1 to 6 atoms, a halogen atom, an alkoxy group having 1 to 6 carbon atoms, a nitro group, a cyano group, a hydroxyl group, and an alkylthio group having 1 to 6 carbon atoms.
- R 1 and R 2 may be bonded to each other to form a ring having 3 to 6 carbon atoms
- R 3 is an alkyl group having 1 to 6 carbon atoms and 3 carbon atoms.
- Q is the formula (6) or the formula (7) :.
- n 1 and n 2 represent a number of 0 or 1, respectively, and X 2 represents a polymer represented by the formula (2), the formula (3) or the formula (5))).
- the structure represented by the formula (1) is the formula (12): (In the equation, R 1 , R 2 , and Q have the same meaning as defined above) Or, equation (13): (In the formula, X 1 has the same meaning as defined above, and Y is an alkyl group having 1 to 6 carbon atoms, a halogen atom, an alkoxy group having 1 to 6 carbon atoms, a nitro group, a cyano group, a hydroxyl group or Represents an alkylthio group having 1 to 6 carbon atoms, m represents an integer of 0 to 4, and when m is 2 to 4, the Y may be the same or different). It is a structure represented by.
- R 1 and R 2 represent a hydrogen atom, a methyl group, an ethyl group or a halogen atom, respectively, and A 1 , A 2 , A 3 , A 4 , A 5 and A 6 are hydrogen atoms, respectively.
- Q 1 represents an alkylene group having 1 to 15 carbon atoms, a phenylene group, a naphthylene group, or an anthrylene group, and the phenylene group, the naphthylene group, and the anthrylene group have 1 to 15 carbon atoms, respectively. Even if it is substituted with a group selected from the group consisting of an alkyl group of 6 and a halogen atom, an alkoxy group having 1 to 6 carbon atoms, a nitro group, a cyano group, a hydroxyl group, and an alkylthio group having 1 to 6 carbon atoms.
- n 1 and n 2 represent numbers of 0 or 1, respectively, where X 1 is equation (5), (6) or equation (7) :.
- R 3 and R 4 represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 3 to 6 carbon atoms, a benzyl group or a phenyl group, respectively, and the phenyl group is A group selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, a halogen atom, an alkoxy group having 1 to 6 carbon atoms, a nitro group, a cyano group, a hydroxyl group, and an alkylthio group having 1 to 6 carbon atoms.
- R 3 and R 4 may be bonded to each other to form a ring having 3 to 6 carbon atoms
- R 5 is an alkyl group having 1 to 6 carbon atoms and a carbon atom. It represents an alkenyl group, a benzyl group or a phenyl group of the number 3 to 6, and the phenyl group is an alkyl group having 1 to 6 carbon atoms, a halogen atom, an alkoxy group having 1 to 6 carbon atoms, a nitro group, or a cyano group.
- the polymer is of formula (12): (In the formula, Q has the same meaning as described above.) It is a polymer having a repeating unit structure represented by the above.
- the polymer is of formula (13) and formula (14):
- Q 2 is formula (15), equation (16) or formula (17):
- Q 3 is the formula (18) :.
- Q 4 represents an alkylene group having 1 to 15 carbon atoms, and n 3 and n 4 represent a number of 0 or 1, respectively.
- Examples of the film material capable of the cross-linking reaction include the following formulas (1), (2), and (3): as disclosed in WO2008 / 069047 A1.
- X represents a hydrogen atom or an aromatic condensed ring and represents Y represents an aromatic condensed ring, and X and Y may be bonded to each other to form a condensed ring.
- R 1 , R 2 , R 3 , R 4 , R 5 , R 10 , R 11 and R 12 respectively, represent hydrogen atoms, halogen atoms or alkyl groups having 1 to 3 carbon atoms, respectively.
- R 6 , R 7 and R 8 represent a chain or cyclic alkyl group having a hydrogen atom or 1 to 10 carbon atoms, respectively.
- R 9 represents a chain or cyclic alkyl group having 1 to 10 carbon atoms or an aromatic group having 6 to 20 carbon atoms, and also.
- R 7 and R 8 may be combined with each other to form a ring.
- M and Q represent a direct bond or a linking group, respectively.
- n represents an integer of 0 or 1.
- the ratio of the number of unit structures represented by (1) (a), the ratio of the number of unit structures represented by the formula (2) (b), and the ratio of the number of unit structures represented by the formula (3) (c) 0.3 ⁇ a ⁇ 0.95, 0.005 ⁇ b ⁇ 0.7, and 0 ⁇ c ⁇ 0.45.
- the polymer contains the unit structures represented by the formulas (1) and (2), and is represented by the formula (1) when the total number of all the unit structures constituting the polymer is 1.0.
- the ratio of the number of unit structures (a) and the ratio of the number of unit structures (b) represented by the formula (2) are 0.305 ⁇ a + b ⁇ 1, 0.3 ⁇ a ⁇ 0.95, 0.005 ⁇ . It is a polymer in which b ⁇ 0.7.
- it is a polymer containing the unit structures represented by the formulas (1) and (3), and is represented by the formula (1) when the total number of all the unit structures constituting the polymer is 1.0.
- the ratio of the number of unit structures (a) and the ratio of the number of unit structures (c) represented by the formula (3) are 0.35 ⁇ a + c ⁇ 1, 0.3 ⁇ a ⁇ 0.95, 0.05 ⁇ It is a polymer in which c ⁇ 0.7.
- the polymer is a polymer containing the unit structures represented by the formulas (1), (2) and (3), and when the total number of all the unit structures constituting the polymer is 1.0, the formula ( The ratio of the number of unit structures represented by 1) (a), the ratio of the number of unit structures represented by the formula (2) (b), and the ratio of the number of unit structures represented by the formula (3) (c)
- the polymer has 0.355 ⁇ a + b + c ⁇ 1, 0.3 ⁇ a ⁇ 0.9, 0.005 ⁇ b ⁇ 0.65, and 0.05 ⁇ c ⁇ 0.65.
- the unit structure represented by the formula (1) is a unit structure composed of vinylnaphthylene, acenaphthylene, vinylanthracene, vinylcarbazole, or a derivative thereof.
- each of the two Ars represents an aryl group, the aryl group has at least one hydroxy group as a substituent, and Q is a divalent linking group having at least one benzene ring or naphthalene ring. , Methylene group or single bond). Its molecular weight is, for example, 150-600.
- examples of the aryl group represented by Ar include a phenyl group, a biphenylyl group, a naphthyl group, an anthryl group, and a phenanthryl group.
- Q represents a divalent linking group having at least one benzene ring or naphthalene ring
- the divalent linking group for example, at least one of the two hydrogen atoms of the methylene group is a phenyl group or a biphenylyl group.
- a divalent aromatic group selected from the group consisting of a divalent group substituted with a naphthyl group, a phenylene group, a biphenylylene group and a naphthylene group, and the divalent aromatic group, a methylene group and an ether group (-.
- Examples thereof include a divalent group having an O— group) or a sulfide group (—S— group).
- the monomer include compounds represented by the following formulas (2-1) to (2-6). (In equation (2-6), m represents an integer from 0 to 3)
- R independently represents an alkyl group having 1 to 10 carbon atoms.
- Examples thereof include fullerene derivatives to which 1 to 6 molecules of malonic acid diester represented by are added.
- T As the membrane material capable of the cross-linking reaction, a polyfunctional (meth) acrylate compound having a molecular weight of 300 to 10,000, which is in a liquid state at room temperature and atmospheric pressure, as disclosed in WO 2011/132640 A1 is used. Can be mentioned.
- the compound is a compound having 2 to 20 (meth) acrylate groups in the molecule.
- the compound has a molecular weight of 300 to 2,300.
- the film material capable of cross-linking reaction is a compound (E) containing a partial structure (I) and a partial structure (II) as disclosed in WO 2017/154921 A1, and the partial structure thereof.
- (II) contains a hydroxy group generated by the reaction of an epoxy group and a proton-generating compound, and the partial structure (I) comprises a partial structure represented by the following formulas (1-1) to (1-5). It is at least one substructure selected from the group, or from a combination of the substructure represented by the formula (1-6) and the substructure represented by the formula (1-7) or the formula (1-8).
- the partial structure (II) is a compound (E) having a partial structure represented by the following formula (2-1) or formula (2-2).
- R 1 , R 1a , R 3 , R 5 , R 5a , and R 6a are saturated hydrocarbon groups having 1 to 10 carbon atoms, aromatic hydrocarbon groups having 6 to 40 carbon atoms, and oxygen, respectively.
- R 2, R 2a, R 4, and R 6 are each a hydrogen atom, C 1 to carbon atoms Indicates a group consisting of 10 saturated hydrocarbon groups, an unsaturated hydrocarbon group having 2 to 10 carbon atoms, an oxygen atom, a carbonyl group, an amide group, an amino group, or a combination thereof, and
- R 2 , R 2a , R 4 , R 6 represents a monovalent group
- R 1 , R 1a , R 3 , R 5a , and R 6a represent a divalent group
- R 5 represents a trivalent group
- the compound (E) contains an epoxy group and a hydroxy group in a molar ratio of 0 ⁇ (epoxide group) / (hydroxy group) ⁇ 0.5, and has a partial structure (II) of 0.01. ⁇ (partial structure (II)) / (partial structure (I) + partial structure (II)) ⁇ 0.8.
- the compound (E) is a compound containing at least one partial structure (I) and at least one partial structure (II).
- R 5a and R 6a are divalent consisting of an alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 40 carbon atoms, an oxygen atom, a carbonyl group, a sulfur atom, or a combination thereof. It is a group.
- the compound (E) contains the partial structure (I) and the partial structure (II) in a proportion of 1 to 1000, respectively.
- (V) As the membrane material capable of the cross-linking reaction, at least one photodegradable nitrogen-containing structure and / or photodegradable sulfur-containing structure and a hydrocarbon structure as disclosed in WO 2018/030198 A1 are used. Examples include compounds containing.
- the compound is a compound having one or more photodegradable nitrogen-containing structures and / or photodegradable sulfur-containing structures in the molecule.
- the compound is a compound in which the photodegradable nitrogen-containing structure and / or the photodegradable sulfur-containing structure and the hydrocarbon structure are present in the same molecule, or are present in molecules having different structures, respectively. It is a combination of compounds to be used.
- the hydrocarbon structure is a saturated or unsaturated group having 1 to 40 carbon atoms, and is a linear, branched or cyclic hydrocarbon group.
- the photodegradable nitrogen-containing structure is a structure that produces a reactive nitrogen-containing functional group or a reactive carbon functional group by irradiation with ultraviolet rays, or a reactive nitrogen-containing functional group or a reactive nitrogen-containing structure generated by irradiation with ultraviolet rays. It is a structure containing a carbon functional group.
- the photodegradable nitrogen-containing structure is a photodegradable nitrogen-containing structure that may contain a sulfur atom, and the structure is an azide structure, a tetraazole structure, a triazole structure, an imidazole structure, a pyrazole structure, or an azole.
- the photodegradable sulfur-containing structure is a structure that generates organic sulfur radicals or carbon radicals by irradiation with ultraviolet rays, or a structure containing organic sulfur radicals or carbon radicals generated by irradiation with ultraviolet rays.
- the photodegradable sulfur-containing structure is a photodegradable sulfur-containing structure that may contain a nitrogen atom, and the structure is a trisulfide structure, a disulfide structure, a sulfide structure, a thioketone structure, a thiophene structure, or a thiol.
- Examples of the membrane material capable of the cross-linking reaction include compounds represented by the following formula (1) as disclosed in WO 2019/013293 A1.
- R 1 is an independently divalent group having 1 to 30 carbon atoms
- R 2 to R 7 are independently linear and branched groups having 1 to 10 carbon atoms, respectively.
- m 3 and m 6 are independently integers from 0 to 9
- m 4 and m 7 are independently integers from 0 to 8
- m 5 is an integer from 1 to 9 and n. is an integer of 0-4, p 2 ⁇ p 7 are each independently an integer of 0 to 2.
- Examples of the membrane material capable of the cross-linking reaction include compounds represented by the following general formula (1) as disclosed in Japanese Patent Application Laid-Open No. 2016-216365.
- n1 and n2 independently represent 0 or 1, respectively, W is either a single bond or a structure represented by the following formula (2).
- R 1 is represented by the following general formula (3). It is one of the structures, and m1 and m2 each independently represent an integer of 0 to 7.
- n1 + m2 is 1 or more and 14 or less.
- l represents an integer of 0 to 3
- Ra to R f are alkyl groups, phenyl groups, or phenylethyl groups having 1 to 10 carbon atoms which may be independently substituted with hydrogen atoms or fluorine, respectively.
- Ra and R b may be combined to form a cyclic compound.
- Q 1 is C 1 -C 30 straight, hydrocarbon group of branched, saturated or unsaturated, alicyclic group having 4 to 20 carbon atoms, Alternatively, it represents a substituted or unsubstituted phenyl group, naphthyl group, anthrasenyl group, or pyrenyl group.
- Q 1 represents a linear or branched saturated or unsaturated hydrocarbon group having 1 to 30 carbon atoms
- Q The methylene group constituting 1 may be substituted with an oxygen atom or a carbonyl group.
- the compound represented by the general formula (1) is a compound represented by the following general formula (4). (Wherein, the m3 and m4 represents 1 or 2, W and R 1 are as defined above.)
- the W is either a single bond or a structure represented by the following formula (5). (In the formula, l is the same as above.)
- the compound represented by the general formula (1) has two or more for Q 1 in the molecule, and the structure and the following general formula as above for Q 1 in the general formula (6) (7) It contains one or more types of structures shown by.
- ** represents a bond site to a carbonyl group
- R h represents a linear or branched saturated or unsaturated hydrocarbon group having 1 to 30 carbon atoms, and a methylene group constituting R h.
- R i is a hydrogen atom or a C 1 -C 10 straight, represents branched hydrocarbon group
- R j is from 1 to 10 carbon atoms
- Examples of the membrane material capable of the cross-linking reaction include compounds represented by the following general formula (1A) as disclosed in JP-A-2017-119670. (In the formula, R is a single bond, an organic group having 1 to 50 carbon atoms, an ether bond, a -SO- group, or a -SO 2- group, and R 1 is a group represented by the following general formula (1B).
- M1 and m2 are integers satisfying 1 ⁇ m1 ⁇ 5, 1 ⁇ m2 ⁇ 5, and 2 ⁇ m1 + m2 ⁇ 8.
- X 1 is a group represented by the following general formula (1C)
- X is a group represented by the following general formula (1D).
- (X) indicates the connection point with the X.
- X 2 is a divalent organic group having 1 to 10 carbon atoms
- n1 is 0 or 1
- n2 is 1 or 2
- X 3 is a group represented by the following general formula (1E).
- R 10 is a hydrogen atom or a saturated or unsaturated hydrocarbon group having 1 to 10 carbon atoms, and the hydrogen atom on the benzene ring in the formula may be substituted with a methyl group or a methoxy group. .
- the molecular weight of the compound is 2,500 or less.
- R is a single bond, an organic group having 1 to 50 carbon atoms, an ether bond, a -SO- group, or a -SO 2- group
- R 2 is a group represented by the following general formula (2B).
- M3 and m4 are integers satisfying 1 ⁇ m3 ⁇ 5, 1 ⁇ m4 ⁇ 5 and 2 ⁇ m3 + m4 ⁇ 8.
- X 11 is a group represented by the following general formula (2C)
- X' is a group represented by the following general formula (2D).
- (X') indicates the connection point with the X'.)
- n3 is 0 or 1
- n4 is 1 or 2
- X 4 is a group represented by the following general formula (2E)
- n6 is 0, 1 or 2.
- R 11 is a hydrogen atom or a saturated or unsaturated hydrocarbon group having 1 to 10 carbon atoms, and the hydrogen atom on the benzene ring in the formula may be substituted with a methyl group or a methoxy group.
- R 101 , R 102 , R 103 , and R 104 are independently hydroxyl groups, m100 is 1, 2, or 3, and R 100 is a hydrogen atom or hydroxyl group when m100 is 1.
- R 101 , R 102 , R 103 , and R 104 are independently hydroxyl groups, m100 is 1, 2, or 3, and R 100 is a hydrogen atom or hydroxyl group when m100 is 1.
- m100 is 2, it is a single bond or a group represented by the following general formula (3B), and when m100 is 3, it is a group represented by the following general formula (3C), and hydrogen on the aromatic ring in the formula.
- Atoms may be substituted with methyl or methoxy groups; m101 is 0 or 1, m102 is 1 or 2, m103 is 0 or 1, m104 is 1 or 2, m105 is 0 or When m101 is 0, n101 and n102 are integers satisfying 0 ⁇ n101 ⁇ 3, 0 ⁇ n102 ⁇ 3 and 1 ⁇ n101 + n102 ⁇ 4, and when m101 is 1, n101, n102, n103, And n104 are integers satisfying 0 ⁇ n101 ⁇ 2, 0 ⁇ n102 ⁇ 2, 0 ⁇ n103 ⁇ 2, 0 ⁇ n104 ⁇ 2, and 2 ⁇ n101 + n102 + n103 + n104 ⁇ 8.)
- * indicates the bond position
- R 106 and R 107 are organic groups that do not contain a hydrogen atom or an ester bond having 1 to 24 carbon atoms, and R 106 and R 107 are bonded to form a cyclic
- Examples of the (z) polyether film material include polymers represented by the following general formula (1), as disclosed in WO2012 / 050064.
- the following formula (1): (In the formula (1), Ar 1 represents an organic group containing an arylene group or a heterocyclic group having 6 to 50 carbon atoms.)
- the membrane material (Y) capable of a cross-linking reaction is preferably (Y1) Membrane material containing an aliphatic ring (for example, (a) and (m) above), (Y2) Novolac film material (for example, (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) (l) above), (Y3) Polyester film material (for example, (z) above), (Y4) Polyester film material (for example, (o) (p) above), (Y5) A compound different from the crosslinkable compound (A) (for example, (m) (n) (r) (s) (t) (u) (v) (w) (x) (y) above), (Y6) Membrane material containing an aromatic condensed ring (for example, (q) above), It contains at least one selected from the group consisting of (Y7) acrylic resin and (Y8) methacrylic resin.
- the content ratio of the crosslinkable film material (Y) is the total solid content. It is usually 1 to 99.9% by mass, preferably 50 to 99.9% by mass, more preferably 50 to 95% by mass, and further preferably 50 to 90% by mass.
- a light absorbing agent, a rheology adjusting agent, an adhesion auxiliary agent, or the like can be further added to the resist underlayer film forming composition of the present invention.
- Rheology modifiers are effective in improving the fluidity of the underlayer film forming composition.
- Adhesive aids are effective in improving the adhesion between the semiconductor substrate or resist and the underlayer film.
- Examples of the light-absorbing agent include commercially available light-absorbing agents described in "Technology and Market of Industrial Dyes” (CMC Publishing) and “Handbook of Dyes” (edited by Society of Synthetic Organic Chemistry), for example, C.I. I. Disperse Yellow 1,3,4,5,7,8,13,23,31,49,50,51,54,60,64,66,68,79,82,88,90,93,102,114 and 124; C.I. I. Disperse Orange 1,5,13,25,29,30,31,44,57,72 and 73; C.I. I.
- the above-mentioned absorbent is usually blended in a proportion of 10% by mass or less, preferably 5% by mass or less, based on the total solid content of the resist underlayer film forming composition.
- the rheology adjuster mainly improves the fluidity of the resist underlayer film forming composition, and particularly improves the film thickness uniformity of the resist underlayer film and the filling property of the resist underlayer film forming composition into the hole in the baking step. It is added for the purpose of enhancing.
- Specific examples include phthalic acid derivatives such as dimethylphthalate, diethylphthalate, diisobutylphthalate, dihexylphthalate and butylisodecylphthalate, adipic acid derivatives such as dinormal butyl adipate, diisobutyl adipate, diisooctyl adipate and octyldecyl adipate, and didi.
- Maleic acid derivatives such as normal butylmalate, diethylmalate, and dinonylmalate, oleic acid derivatives such as methyl olate, butyl oleate, and tetrahydrofurfuryl oleate, or stearic acid derivatives such as normal butyl stearate and glyceryl stearate can be mentioned.
- rheology adjusters are usually blended in a proportion of less than 30% by mass with respect to the total solid content of the resist underlayer film forming composition.
- the adhesion aid is mainly added for the purpose of improving the adhesion between the substrate or the resist and the resist underlayer film forming composition, and particularly for preventing the resist from peeling off during development.
- Specific examples include chlorosilanes such as trimethylchlorosilane, dimethylmethylolchlorosilane, methyldiphenylchlorosilane, and chloromethyldimethylchlorosilane, trimethylmethoxysilane, dimethyldiethoxysilane, methyldimethoxysilane, dimethylmethylolethoxysilane, diphenyldimethoxysilane, and fluorine.
- Alkoxysilanes such as enyltriethoxysilane, hexamethyldisilazane, N, N'-bis (trimethylsilyl) urea, dimethyltrimethylsilylamine, cilazanes such as trimethylsilylimidazole, methyloltrichlorosilane, ⁇ -chloropropyltrimethoxysilane, ⁇ -Silanes such as aminopropyltriethoxysilane and ⁇ -glycidoxypropyltrimethoxysilane, benzotriazole, benzimidazole, indazole, imidazole, 2-mercaptobenzimidazole, 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, urasol , Heterocyclic compounds such as thiouracil, mercaptoimidazole, mercaptopyrimidine, urea such as 1,1-dimethylurea and 1,3-dimethyl
- the solid content of the resist underlayer film forming composition according to the present invention is usually 0.1 to 70% by mass, preferably 0.1 to 60% by mass.
- the solid content is the content ratio of all the components excluding the solvent from the resist underlayer film forming composition.
- the proportion of the polymer in the solid content is preferably 1 to 100% by mass, 1 to 99.9% by mass, 50 to 99.9% by mass, 50 to 95% by mass, and 50 to 90% by mass in this order.
- One of the scales for evaluating whether or not the resist underlayer film forming composition is in a uniform solution state is to observe the passability of a specific microfilter, but the resist underlayer film forming composition according to the present invention has. , Passes through a microfilter having a pore size of 0.1 ⁇ m and exhibits a uniform solution state.
- microfilter material examples include fluororesins such as PTFE (polytetrafluoroethylene) and PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), PE (polyethylene), UPE (ultrahigh molecular weight polyethylene), and PP ( (Polypropylene), PSF (polysulphon), PES (polyethersulfone), nylon can be mentioned, but it is preferably made of PTFE (polytetrafluoroethylene).
- fluororesins such as PTFE (polytetrafluoroethylene) and PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer)
- PE polyethylene
- UPE ultrahigh molecular weight polyethylene
- PP polypropylene
- PSF polysulphon
- PES polyethersulfone
- nylon but it is preferably made of PTFE (polytetrafluoroethylene).
- the resist underlayer film can be formed as follows by using the resist underlayer film forming composition according to the present invention.
- Substrates used in the manufacture of semiconductor devices eg, silicon wafer substrates, silicon / silicon dioxide coated substrates, silicon nitride substrates, glass substrates, ITO substrates, polyimide substrates, and low-k dielectric material (low-k materials) coated substrates. Etc.
- the resist underlayer film forming composition of the present invention is applied by an appropriate coating method such as a spinner or a coater, and then the resist underlayer film is formed by firing using a heating means such as a hot plate.
- the firing conditions are appropriately selected from a firing temperature of 80 ° C. to 600 ° C.
- the firing temperature is 150 ° C. to 350 ° C. and the firing time is 0.5 to 2 minutes.
- Air may be used as the atmospheric gas at the time of firing, or an inert gas such as nitrogen or argon may be used.
- the film thickness of the underlayer film formed is, for example, 10 to 1000 nm, 20 to 500 nm, 30 to 400 nm, or 50 to 300 nm. Further, if a quartz substrate is used as the substrate, a replica of the quartz imprint mold (mold replica) can be produced.
- a close contact layer and / or a silicone layer containing 99% by mass or less, or 50% by mass or less of Si can be formed on the resist underlayer film according to the present invention by coating or vapor deposition.
- a close contact layer and / or a silicone layer containing 99% by mass or less, or 50% by mass or less of Si can be formed on the resist underlayer film according to the present invention by coating or vapor deposition.
- the adhesion layer described in Japanese Patent Application Laid-Open No. 2013-202982 and Japanese Patent No. 5827180 and the silicon-containing resist underlayer film (inorganic resist underlayer film) forming composition described in WO2009 / 104552A1 by spin coating.
- a Si-based inorganic material film can be formed by a CVD method or the like.
- the resist underlayer film forming composition according to the present invention is applied onto a semiconductor substrate (so-called stepped substrate) having a portion having a step and a portion having no step, and fired to obtain the portion having the step. It is possible to form a resist underlayer film in which the step with the portion having no step is in the range of 3 to 70 nm.
- the method for manufacturing a semiconductor device according to the present invention is as follows.
- the process includes a step of etching and patterning the resist underlayer film through the formed resist pattern, and a step of processing a semiconductor substrate through the patterned resist underlayer film.
- the method for manufacturing a semiconductor device is as follows.
- a step of forming a resist underlayer film using the resist underlayer film forming composition according to the present invention The process of forming a hard mask on the formed resist underlayer film, The process of forming a resist film on the formed hard mask, A step of forming a resist pattern by irradiating and developing a resist film formed with light or an electron beam.
- the step of forming the resist underlayer film using the resist underlayer film forming composition according to the present invention is as described above.
- An organopolysiloxane film may be formed as a second resist underlayer film on the resist underlayer film formed by the above step, and a resist pattern may be formed on the resist underlayer film.
- the second resist underlayer film may be a SiON film or a SiN film formed by a vapor deposition method such as CVD or PVD.
- an antireflection film BARC
- the third resist underlayer film is a resist shape correction film having no antireflection ability. You may.
- the exposure is performed through a mask (reticle) for forming a predetermined pattern or by drawing directly.
- a mask for example, g-ray, i-ray, KrF excimer laser, ArF excimer laser, EUV, and electron beam can be used.
- post-exposure heating (Post ExposureBake) is performed if necessary.
- a developing solution for example, 2.38% by mass tetramethylammonium hydroxide aqueous solution
- a rinsing solution or pure water to remove the used developing solution.
- post-baking is performed to dry the resist pattern and improve the adhesion with the substrate.
- the etching step performed after the resist pattern formation is performed by dry etching.
- the etching gas used for dry etching include CHF 3 , CF 4 , and C 2 F 6 for the second resist underlayer film (organopolysiloxane film), and the resist underlayer film forming composition of the present invention can be used.
- the formed first resist underlayer film include O 2 , N 2 O, and NO 2 , and for surfaces having steps or recesses and / or protrusions, for example, CHF 3 , CF 4 , C. 2 F 6 can be mentioned.
- argon, nitrogen or carbon dioxide can be mixed with these gases and used.
- the method is A step of applying the curable composition onto the formed resist underlayer film, The step of bringing the curable composition into contact with the mold, A step of irradiating the curable composition with light or an electron beam to form a cured film, and a step of separating the cured film from the mold. including.
- the adhesion between the resist composition and the base material is important. If the adhesion between the resist composition and the base material is low, when the mold is separated in the mold release step, a part of the photocured product obtained by curing the resist composition is peeled off while adhering to the mold. This is because the pattern peeling defect may occur.
- a technique for improving the adhesion between the resist composition and the base material a technique for forming an adhesion layer, which is a layer for bringing the resist composition and the base material into close contact, between the resist composition and the base material. Has been proposed.
- a high etching resistance layer may be used for pattern formation in nanoimprint.
- a material for the high etching resistance layer an organic material and a silicone material are generally used.
- a adhesion layer and a silicone layer containing Si can be formed on the nanoimprint resist underlayer film by coating or vapor deposition. When these adhesion layers and the silicone layer containing Si are hydrophobic and show a high pure water contact angle, the lower film is also hydrophobic and shows a high pure water contact angle, the adhesion between the films is better. It is expected that it will increase and become difficult to peel off.
- the adhesion layer or the silicone layer is hydrophilic and shows a low pure contact angle
- the lower film is also hydrophilic and shows a low pure contact angle
- the adhesion between the films is improved and the film peels off. It is expected to be difficult.
- the adhesive film may be used the He, H 2, N 2, air and the like.
- the polymer (X) according to the present invention exhibits a desired pure water contact angle not only during low-temperature firing but also during high-temperature firing, and is also desired when a cross-linking agent, an acid catalyst and a surfactant are mixed and used as a material. Indicates the pure water contact angle. As a result, it is possible to improve the adhesion to the upper layer film, and it can be expected to show good permeability to gases such as He, H 2 , N 2, and air. Further, the polymer (X) according to the present invention exhibits good flattening property, and can be adjusted to an optical constant and an etching rate suitable for the process by changing the molecular skeleton.
- the photoresist formed on the resist underlayer film is not particularly limited as long as it is sensitive to light used for exposure. Both negative photoresists and positive photoresists can be used.
- a chemically amplified photoresist composed of a low molecular weight compound that decomposes to increase the alkali dissolution rate of the photoresist, an alkali-soluble binder, and a photoacid generator, and a binder having a group that decomposes with an acid to increase the alkali dissolution rate.
- the product name APEX-E manufactured by Shipley Co., Ltd. the product name PAR710 manufactured by Sumitomo Chemical Co., Ltd., and the product name SEPR430 manufactured by Shin-Etsu Chemical Co., Ltd. can be mentioned.
- Proc. SPIE, Vol. 3999, 330-334 (2000), Proc. SPIE, Vol. 3999,357-364 (2000), and Proc. SPIE, Vol. Fluorine-containing atomic polymer-based photoresists as described in 3999,365-374 (2000) can be mentioned.
- Step of applying the curable composition This step is a step of applying the curable composition onto the resist underlayer film formed by the method for producing a resist underlayer film according to the present invention.
- the method for applying the curable composition include an inkjet method, a dip coating method, an air knife coating method, a curtain coating method, a wire bar coating method, a gravure coating method, an extrusion coating method, a spin coating method, and a slit scan method. Etc. can be used.
- the inkjet method is suitable for applying the curable composition as droplets
- the spin coating method is suitable for applying the curable composition.
- a adhesion layer and / or a silicone layer containing 99% by mass or less, or 50% by mass or less of Si may be formed on the resist underlayer film by coating or vapor deposition, and a curable composition may be applied thereto. can.
- Step of contacting the curable composition with the mold the curable composition is brought into contact with the mold.
- the curable composition that is a liquid and a mold having a prototype pattern for transferring the pattern shape are brought into contact with each other, a liquid film is formed in which the curable composition is filled in the recesses of the fine pattern on the mold surface. Will be done.
- the mold base material is preferably a phototransparent resin such as glass, quartz, PMMA, or polycarbonate resin, a transparent metal vapor deposition film, a flexible film such as polydimethylsiloxane, a photocurable film, or a metal film. Since the coefficient of thermal expansion is small and the pattern strain is small, the mold base material is more preferably quartz.
- the fine pattern on the surface of the mold preferably has a pattern height of 4 nm or more and 200 nm or less.
- a certain pattern height is required to improve the processing accuracy of the substrate, but the lower the pattern height, the stronger the force to peel the mold from the cured film in the process of separating the cured film and the mold, which will be described later. It is low, and the number of defects remaining on the mask side due to the resist pattern being torn off is small. It is recommended to select and adopt an appropriate balance pattern height in consideration of these.
- adjacent resist patterns may come into contact with each other due to elastic deformation of the resist pattern due to an impact when the mold is peeled off, and the resist patterns may be adhered or damaged. This may be avoided by setting the pattern height to about twice or less (aspect ratio 2 or less) with respect to the pattern width.
- the mold can be surface-treated in advance.
- the surface treatment method include a method of applying a release agent to the surface of the mold to form a release agent layer.
- Mold release agents include silicone-based mold release agents, fluorine-based mold release agents, hydrocarbon-based mold release agents, polyethylene-based mold release agents, polypropylene-based mold release agents, paraffin-based mold release agents, Montan-based mold release agents, and carnauba. A release agent and the like can be mentioned. Fluorine-based and hydrocarbon-based mold release agents are preferable. Examples of commercially available products include Optool (registered trademark) DSX manufactured by Daikin Industries, Ltd. One type of release agent may be used alone, or two or more types may be used in combination.
- the pressure applied to the curable composition when the mold and the curable composition are brought into contact with each other is not particularly limited. Pressures of 0 MPa or more and 100 MPa or less are recommended. The pressure is preferably 0 MPa or more, 50 MPa or less, 30 MPa or less, or 20 MPa or less.
- the spread of the curable composition in this step is completed promptly.
- the contact time is not particularly limited, but is preferably 0.1 seconds or more, 600 seconds or less, 3 seconds or less, or 1 second or less. If the contact time is too short, the spread and fill will be inadequate and defects called unfilled defects may occur.
- This step can be performed under any conditions of atmospheric atmosphere, reduced pressure atmosphere, and inert gas atmosphere, but is preferably performed under a pressure of 0.0001 atm or more and 10 atm or less. In order to prevent the influence of oxygen and water on the curing reaction, it is recommended to carry out under reduced pressure atmosphere or in an inert gas atmosphere.
- Specific examples of the inert gas that can be used to create an inert gas atmosphere include nitrogen, carbon dioxide, helium, argon, CFC, HCFC, HFC, or a mixed gas thereof.
- This step may be performed in an atmosphere containing a condensable gas (hereinafter referred to as "condensable gas atmosphere").
- the condensable gas is condensed by the capillary pressure generated at the time of filling when the concave portion of the fine pattern formed on the mold and the gap between the mold and the substrate are filled together with the curable composition. It is a gas that liquefies.
- the condensable gas exists as a gas in the atmosphere before the curable composition and the mold come into contact with each other in this step.
- the gas filled in the recesses of the fine pattern is liquefied by the capillary pressure generated by the curable composition, and the bubbles disappear, so that the filling property is excellent.
- the condensable gas may be dissolved in the curable composition.
- the boiling point of the condensable gas is not limited as long as it is below the atmospheric temperature of this step, but is preferably ⁇ 10 ° C. or higher, or + 10 ° C. or higher, or + 23 ° C. or lower.
- the vapor pressure of the condensable gas at the atmospheric temperature in this step is not particularly limited as long as it is equal to or lower than the mold pressure. It is preferably in the range of 0.1 MPa to 0.4 MPa.
- the condensable gas include chlorofluorocarbon (CFC) such as trichlorofluoromethane, fluorocarbon (FC), hydrochlorofluorocarbon (HCFC), and 1,1,1,3,3-pentafluoropropane (CHF 2 CH).
- CFC chlorofluorocarbon
- FC fluorocarbon
- HCFC hydrochlorofluorocarbon
- CHF 2 CH 1,1,1,3,3-pentafluoropropane
- HFCs hydrofluorocarbons
- HFEs hydrofluoroethers
- CF 3 CF 2 OCH 3 , HFE-245 mc pentafluoroethyl methyl ether
- condensable gas one type may be used alone, or two or more types may be mixed and used. Further, these condensable gases may be mixed with non-condensable gases such as air, nitrogen, carbon dioxide, helium and argon. As the non-condensable gas to be mixed with the condensable gas, air and helium are preferable.
- Step of irradiating the curable composition with light or an electron beam to form a cured film the curable composition is irradiated with light or an electron beam to form a cured film. That is, the curable composition filled in the fine pattern of the mold is irradiated with light or an electron beam through the mold, and the curable composition filled in the fine pattern of the mold is cured in that state to form a pattern. A cured film having a shape.
- Light or electron beam is selected according to the sensitivity wavelength of the curable composition. Specifically, ultraviolet light having a wavelength of 150 nm or more and 400 nm or less, X-rays, electron beams and the like can be appropriately selected and used.
- Examples of light or electron beam light sources include high-pressure mercury lamps, ultra-high pressure mercury lamps, low-pressure mercury lamps, Deep-UV lamps, carbon arc lamps, chemical lamps, metal halide lamps, xenon lamps, KrF excimer lasers, ArF excimer lasers, and F2 excimer lasers. And so on.
- the number of light sources may be one or plural. Irradiation may be applied to the entire curable composition filled in the fine pattern of the mold, or to only a part of the region.
- the light irradiation may be performed intermittently a plurality of times on the entire region on the substrate, or the entire region may be continuously irradiated. It is also possible to perform the first irradiation on a part of the substrate and the second irradiation on a region different from the region.
- the cured film thus obtained preferably has a pattern having a size of 1 nm or more, 10 nm or more, 10 mm or less, or 100 ⁇ m or less.
- the cured film and the mold are separated.
- the cured film having a pattern shape and the mold are separated from each other, and a cured film having a pattern shape which is an inverted pattern of a fine pattern formed on the mold is obtained in a self-supporting state.
- the substrate may be fixed and the mold may be moved away from the substrate to be peeled off, or the mold may be fixed and the substrate may be moved away from the mold to be peeled off.
- the substrate and the mold may be pulled in opposite directions to move and peel off.
- any ROCH 2 -group containing a methoxymethyl group and a hydroxy group or ROCH 2 -group are bonded and crosslinked, but it is extremely complicated to show the state in the chemical formula. Therefore, only the structural unit is shown. The same applies hereinafter.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 4,500.
- the introduction of PGME was confirmed by 1 1 H-NMR.
- the obtained resin was dissolved in PGMEA, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 3,487.
- the introduction of 1-butyl group was confirmed by 1 1 H-NMR.
- the obtained resin was dissolved in PGME, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 3,978.
- the introduction of PGME was confirmed by 1 1 H-NMR.
- the obtained resin was dissolved in PGME, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 4,000.
- the introduction of PGME was confirmed by 1 1 H-NMR.
- the obtained resin was dissolved in PGMEA, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 4,500.
- the introduction of PGME was confirmed by 1 1 H-NMR.
- the obtained resin was dissolved in PGMEA, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 4,100.
- the introduction of PGME was confirmed by 1 1 H-NMR.
- the obtained resin was dissolved in PGMEA, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 3,700.
- the introduction of PGME was confirmed by 1 1 H-NMR.
- the obtained resin was dissolved in PGMEA, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 4,200.
- the introduction of PGME was confirmed by 1 1 H-NMR.
- the obtained resin was dissolved in PGME, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 3,200.
- the obtained resin was dissolved in PGMEA, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the polymer (2-3) was obtained by drying.
- the weight average molecular weight Mw measured by GPC in terms of polystyrene was about 2,800.
- the obtained resin was dissolved in PGMEA, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- the obtained resin was dissolved in PGMEA, and ion exchange was carried out for 4 hours using a cation exchange resin and an anion exchange resin to obtain a target polymer solution.
- Example 1 A resin solution (solid content: 21.38% by mass) was obtained in Synthesis Example 1. To 9.12 g of this resin solution, 0.39 g of TMOM-BP (manufactured by Honshu Kagaku Co., Ltd.), 2.92 g of PGME containing 2% by mass K-PURE TAG2689 (manufactured by King Industries), 1% by mass of surfactant (DIC Corporation) ), Megafuck R-40) containing 0.20 g of PGMEA, 4.96 g of PGMEA, and 2.41 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition. A solution of the substance was prepared.
- Example 2 A resin solution (solid content: 26.93% by mass) was obtained in Synthesis Example 3.
- 0.33 g of TMOM-BP manufactured by Honshu Kagaku Co., Ltd.
- 2 mass% K-PURE TAG2689 manufactured by King Industries
- 2.43 g of PGME 1 mass% surfactant (DIC Corporation)
- Megafuck R-40 containing 0.16 g of PGMEA, 5.24 g of PGMEA, and 5.80 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition.
- a solution of the substance was prepared.
- Example 3 A resin solution (solid content: 22.01% by mass) was obtained in Synthesis Example 4.
- this resin solution 0.33 g of TMOM-BP (manufactured by Honshu Kagaku Co., Ltd.), 2 mass% K-PURE TAG2689 (manufactured by King Industries), 2.43 g of PGME, 1 mass% surfactant (DIC Corporation) ), Megafuck R-40) containing 0.16 g of PGMEA, 5.24 g of PGMEA, and 4.46 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition.
- a solution of the substance was prepared.
- Example 4 A resin solution (solid content: 20.12% by mass) was obtained in Synthesis Example 5.
- this resin solution 0.33 g of TMOM-BP (manufactured by Honshu Kagaku Co., Ltd.), 2 mass% K-PURE TAG2689 (manufactured by King Industries) PGME 2.43 g, 1 mass% surfactant (DIC Corporation) ), Megafuck R-40) containing 0.16 g of PGMEA, 5.24 g of PGMEA, and 3.76 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition.
- a solution of the substance was prepared.
- Example 5 A resin solution (solid content: 17.85% by mass) was obtained in Synthesis Example 6. To 10.92 g of this resin solution, 0.39 g of TMOM-BP (manufactured by Honshu Kagaku Co., Ltd.), 2.92 g of PGME containing 2% by mass K-PURE TAG2689 (manufactured by King Industries), 1 mass% surfactant (DIC Corporation) ), Megafuck R-40) containing 0.20 g of PGMEA, 3.15 g of PGMEA, and 2.41 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition. A solution of the substance was prepared.
- Example 6 A resin solution (solid content: 16.62% by mass) was obtained in Synthesis Example 7. To 11.73 g of this resin solution, 0.39 g of TMOM-BP (manufactured by Honshu Kagaku Co., Ltd.), 2.92 g of PGME containing 2% by mass K-PURE TAG2689 (manufactured by King Industries), 1 mass% surfactant (DIC Corporation) ), Megafuck R-40) containing 0.20 g of PGMEA, 2.35 g of PGMEA, and 2.41 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition. A solution of the substance was prepared.
- Example 7 A resin solution (solid content: 18.61% by mass) was obtained in Synthesis Example 8. 10.48 g of this resin solution contains 0.39 g of TMOM-BP (manufactured by Honshu Kagaku Co., Ltd.), 2% by mass of K-PURE TAG2689 (manufactured by King Industries), 2.92 g of PGME, and 1 mass% of surfactant (DIC Corporation). ), Megafuck R-40) containing 0.20 g of PGMEA, 3.61 g of PGMEA and 2.41 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition. A solution of the substance was prepared.
- Example 8 A resin solution (solid content: 16.88% by mass) was obtained in Synthesis Example 9. To 11.55 g of this resin solution, 0.39 g of TMOM-BP (manufactured by Honshu Kagaku Co., Ltd.), 2% by mass of K-PURE TAG2689 (manufactured by King Industries) PGME 2.92 g, 1 mass% surfactant (DIC Corporation) ), Megafuck R-40) containing 0.20 g of PGMEA, 2.52 g of PGMEA, and 2.41 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition. A solution of the substance was prepared.
- Example 9 A resin solution (solid content: 18.06% by mass) was obtained in Synthesis Example 10. To 10.80 g of this resin solution, 0.39 g of TMOM-BP (manufactured by Honshu Kagaku Co., Ltd.), 2.92 g of PGME containing 2% by mass K-PURE TAG2689 (manufactured by King Industries), 1 mass% surfactant (DIC Corporation) ), Megafuck R-40) containing 0.20 g of PGMEA, 3.28 g of PGMEA, and 2.41 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition. A solution of the substance was prepared.
- Example 10 A resin solution (solid content: 17.62% by mass) was obtained in Synthesis Example 11. To 13.82 g of this resin solution, 0.49 g of TMOM-BP (manufactured by Honshu Chemical Industry Co., Ltd.), 1.44 g of PGME containing 5 mass% pyridinium p-hydroxybenzene sulfonate, 1 mass% surfactant (manufactured by DIC Corporation, Megafuck R-40) containing 0.49 g of PGMEA, 6.12 g of PGMEA, and 2.64 g of PGMEA are added and dissolved, filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m, and a solution of the resist underlayer film forming composition. was prepared.
- TMOM-BP manufactured by Honshu Chemical Industry Co., Ltd.
- PGME containing 5 mass% pyridinium p-hydroxybenzene sulfonate 1 mass% surfactant (manufacture
- Example 11 A resin solution (solid content: 21.38% by mass) was obtained in Synthesis Example 1. To 11.80 g of this resin solution, 0.39 g of TMOM-BP (manufactured by Honshu Kagaku Co., Ltd.), 2.78 g of PGME containing 2% by mass K-PURE TAG2689 (manufactured by King Industries), 1 mass% surfactant (DIC Corporation) ), Megafuck R-40) containing 0.25 g of PGMEA, 2.66 g of PGMEA, and 1.51 g of PGMEA are added and dissolved, and filtered through a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m to form a resist underlayer film formation composition. A solution of the substance was prepared.
- Example 12 A resin solution (solid content: 21.38% by mass) was obtained in Synthesis Example 1. To 12.15 g of this resin solution, 0.26 g of PGMEA, 2.37 g of PGMEA and 5.22 g of PGMEA containing 1% by mass surfactant (Megafuck R-40 manufactured by DIC Co., Ltd.) were added and dissolved, and a poly having a pore size of 0.1 ⁇ m was added and dissolved. A solution of the resist underlayer film forming composition was prepared by filtering with a tetrafluoroethylene microfilter.
- Example 13 A resin solution (solid content: 21.38% by mass) was obtained in Synthesis Example 1. To 14.02 g of this resin solution, 0.30 g of PGMEA, 0.58 g of PGMEA and 5.10 g of PGMEA containing 1% by mass of surfactant (Megafuck R-40 manufactured by DIC Co., Ltd.) were added and dissolved to dissolve a poly having a pore size of 0.1 ⁇ m. A solution of the resist underlayer film forming composition was prepared by filtering with a tetrafluoroethylene microfilter.
- Example 14 A resin solution (solid content: 30.00% by mass) was obtained in Synthesis Example 12. To 4.33 g of this resin solution, 1.22 g of the polymer solution obtained in Synthesis Example 1 (solid content is 21.38% by mass), 2.95 g of PGME containing 2% by mass of K-PURE TAG2689 (manufactured by King Industries), 1% by mass. Add 0.13 g of PGMEA, 10.63 g of PGMEA, and 1.77 g of PGMEA containing a surfactant (DIC Co., Ltd., Megafuck R-40) to dissolve, and filter with a polytetrafluoroethylene microfilter having a pore size of 0.1 ⁇ m. To prepare a solution of the resist underlayer film forming composition.
- a methoxypropoxy group is introduced into the side chain by synthesizing a polymer in PGME having a non-phenolic hydroxyl group in the molecule. Therefore, it exhibits higher solubility in PGME or PGMEA after ion exchange than the polymer synthesized in 1,4-dioxane which does not have a non-phenolic hydroxyl group in the molecule.
- the polymer can be synthesized in PGME, which is a solvent generally used in the semiconductor industry, without using 1,4-dioxane, which is a highly harmful solvent classified as specified hazardous industrial waste. Is advantageous.
- the solutions of the resist underlayer film forming compositions prepared in Comparative Example 1 and Example 1-13 were each applied onto a silicon wafer using a spin coater.
- the resist underlayer film (film thickness 50 nm) was formed by firing on a hot plate at 240 ° C. for 60 seconds or 350 ° C. for 60 seconds.
- the refractive index (n value) and the optical extinction coefficient (k value, also referred to as attenuation coefficient) at a wavelength of 193 nm were measured using a spectroscopic ellipsometer. The results are shown in Table 2.
- the optical constant of the resist underlayer film can be freely controlled by changing the type of the compound to be reacted.
- the solutions of the resist underlayer film forming compositions prepared in Comparative Example 1 and Example 1-13 were each applied onto a silicon wafer using a spin coater.
- a resist underlayer film (thickness 200 nm) was formed by firing on a hot plate at 240 ° C. for 60 seconds or 350 ° C. for 60 seconds.
- the dry etching rate was measured using CF 4 gas as the etching gas, and the dry etching rate ratios of Comparative Example 1 and Example 1-13 were determined.
- the dry etching rate ratio is the dry etching rate ratio of (resist underlayer film) / (KrF photoresist). The results are shown in Table 3.
- the etching resistance of the resist underlayer film can be freely controlled by changing the type of the compound to be reacted.
- the embedding property was confirmed in a dense pattern area having a film thickness of 200 nm, a SiO 2 substrate, a trench width of 50 nm, and a pitch of 100 nm.
- the resist underlayer film forming composition prepared in Comparative Example 1 and Example 1-13 was applied onto the substrate and then fired at 240 ° C. for 60 seconds or 350 ° C. for 60 seconds to form a resist underlayer film having a diameter of about 200 nm.
- the flatness of this substrate was observed using a scanning electron microscope (S-4800) manufactured by Hitachi High-Technologies Corporation, and the presence or absence of filling of the resist underlayer film forming composition inside the pattern was confirmed. The results are shown in Table 5.
- Examples 1-13 show high embedding property as in the conventional material.
- the hardness of the resist underlayer film can be significantly increased by using a material having a crosslinked structure in the polymer.
- the solutions of the resist underlayer film forming compositions prepared in Comparative Example 1 and Example 1-13 were each applied on a silicon wafer with a silicon oxide film using a spin coater.
- a resist underlayer film (thickness 200 nm) was formed by firing on a hot plate at 240 ° C. for 60 seconds or 350 ° C. for 60 seconds.
- a silicon hard mask forming composition solution was applied onto the resist underlayer film and fired at 240 ° C. for 1 minute to form a silicon hard mask layer (thickness 30 nm).
- a resist solution was applied thereto and calcined at 100 ° C. for 1 minute to form a resist layer (thickness: 150 nm).
- An exposure was made using a mask at a wavelength of 193 nm, and after exposure, heating PEB (at 105 ° C. for 1 minute) was performed and then developed to obtain a resist pattern. Then, dry etching was performed using a fluorine-based gas and an oxygen-based gas, the resist pattern was transferred to a silicon wafer with a silicon oxide film, and the shape of each pattern was observed with CG-4100 manufactured by Hitachi High-Technology Corporation.
- the examples showed higher bending resistance than the comparative examples.
- the amount of sublimated material in the resist underlayer film forming composition can be significantly reduced as compared with the conventional cross-linking agent, so that there is less concern about equipment contamination.
- Coating test on stepped substrate As a coating test on a stepped substrate, a comparison of coating thickness between an open area (OPEN) where no pattern is formed and a dense pattern area (DENSE) with a trench width of 50 nm and a pitch of 100 nm on a 200 nm film thickness SiO 2 substrate. was done.
- the resist underlayer film forming composition prepared in Comparative Example 2 and Example 14 was applied to the substrate and then fired at 240 ° C. for 60 seconds to form a resist underlayer film having a diameter of about 200 nm.
- the flatness of this substrate was observed using a scanning electron microscope (S-4800) manufactured by Hitachi High-Technologies Corporation, and the film thickness between the trench area (pattern portion) and the open area (non-pattern portion) of the stepped substrate was observed.
- the flatness was evaluated by measuring the difference (the coating step between the trench area and the open area, which is called the bias).
- the flattening property means a portion where a pattern exists (trench area (pattern portion)) and a portion where no pattern exists (open area (non-pattern portion)), and the coated coating existing on the upper portion thereof. It means that the film thickness difference (Iso-dense bias) of the object is small.
- Table 8 The results are shown in Table 8.
- the introduction of the alcohol compound into the side chain causes a decrease in the glass transition temperature and a decrease in viscosity, so that the flatness of the resist underlayer film forming composition is significantly improved.
- the solubility in PGME and PGMEA is improved, the amount of sublimates that contaminate the apparatus is reduced, and the coating flatness on a stepped substrate or the like is improved.
- a novel resist underlayer film forming composition that meets the demand for increasing the hardness of the resist underlayer film and retains other good properties.
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Abstract
Description
で表される構造単位を有するポリマー及び溶剤を含むレジスト下層膜形成組成物が開示されている。
[1] メトキシメチル基とメトキシメチル基以外のROCH2-基(Rは一価の有機基、水素原子又はこれらの混合である)とを有する同一又は異なる複数の構造単位、及び前記複数の構造単位を連結する連結基を含むポリマー(X)、並びに溶剤を含むレジスト下層膜形成組成物。
[2] Rが、フェニル基、ナフチル基若しくはアントラセニル基で置換されていてもよく、酸素原子若しくはカルボニル基で中断されていてもよい、飽和若しくは不飽和の直鎖若しくは分岐のC2-C20脂肪族炭化水素基、C3-C20脂環式炭化水素基、水素原子又はこれらの混合である、[1]に記載のレジスト下層膜形成組成物。
[3] 連結基が、アルキレン基、エーテル基、又はカルボニル基を含む、[1]又は[2]に記載のレジスト下層膜形成組成物。
[4] 構造単位が、フェノール性水酸基を有してもよく、置換若しくは無置換アミノ基を有してもよい芳香族環、複素環、又は縮合環を含む、[1]乃至[3]のいずれか一項に記載のレジスト下層膜形成組成物。
[5] ポリマー(X)と架橋反応可能な膜材料(Y)を更に含む、[1]乃至[4]のいずれか一項に記載のレジスト下層膜形成組成物。
[6] 架橋剤を更に含む、[1]乃至[5]のいずれか一項に記載のレジスト下層膜形成組成物。
[7] 酸及び/又は酸発生剤を更に含む、[1]乃至[6]のいずれか一項に記載のレジスト下層膜形成組成物。
[8] 界面活性剤を更に含む、[1]乃至[7]のいずれか一項に記載のレジスト下層膜形成組成物。
[9] 前記溶剤が160℃以上の沸点を有する溶媒を含む[1]乃至[8]のいずれか一項に記載のレジスト下層膜形成組成物。
[10] [1]乃至[9]のいずれか一項に記載の組成物からなる塗布膜の焼成物であることを特徴とするレジスト下層膜。
[11] 半導体基板上に[1]乃至[9]のいずれか一項に記載の組成物を用いてレジスト下層膜を形成する工程、
形成されたレジスト下層膜の上にレジスト膜を形成する工程、
形成されたレジスト膜に対する光又は電子線の照射と現像によりレジストパターンを形成する工程、
形成されたレジストパターンを介して前記レジスト下層膜をエッチングし、パターン化する工程、及び
パターン化されたレジスト下層膜を介して半導体基板を加工する工程
を含む半導体装置の製造方法。
[12] 半導体基板上に[1]乃至[9]のいずれか一項に記載の組成物を用いてレジスト下層膜を形成する工程、
形成されたレジスト下層膜の上にハードマスクを形成する工程、
形成されたハードマスクの上にレジスト膜を形成する工程、
形成されたレジスト膜に対する光又は電子線の照射と現像によりレジストパターンを形成する工程、
形成されたレジストパターンを介して前記ハードマスクをエッチングし、パターン化する工程、及び
パターン化されたハードマスクを介して前記レジスト下層膜をエッチングし、パターン化する工程、及び
パターン化されたレジスト下層膜を介して半導体基板を加工する工程
を含む半導体装置の製造方法。
[13] レジスト下層膜を形成する工程をナノインプリント法によって行う[11]又は[12]に記載の半導体装置の製造方法。
ポリマー(X)は、メトキシメチル基とメトキシメチル基以外のROCH2-基(Rは一価の有機基、水素原子又はこれらの混合である)とを有する同一又は異なる複数の構造単位、及び前記複数の構造単位を連結する連結基を含む。
本発明のレジスト下層膜形成組成物は、上記の各成分を適当な溶剤に溶解させることによって調製でき、均一な溶液状態で用いられる。
(式(i)中のR1、R2及びR3は各々水素原子、酸素原子、硫黄原子又はアミド結合で中断されていてもよい炭素原子数1~20のアルキル基を表し、互いに同一であっても異なっても良く、互いに結合して環構造を形成しても良い。)
下記式:
で表される化合物が好ましく、式(i)で表される化合物として特に好ましいのは、3-メトキシ-N,N-ジメチルプロピオンアミド、及びN,N-ジメチルイソブチルアミドである。
本発明のレジスト下層膜形成組成物は、更に任意成分として、架橋剤、酸及び/又は酸発生剤、熱酸発生剤及び界面活性剤のうち少なくとも1つを含有してもよい。
本発明のレジスト下層膜形成組成物は、さらに架橋剤を含有することができる。前記架橋剤としては、少なくとも二つの架橋形成置換基を有する架橋性化合物が好ましく用いられる。例えば、メチロール基、メトキシメチル基等の架橋形成置換基を有する、メラミン系化合物、置換尿素系化合物及びフェノール系化合物またはそれらのポリマー系等が挙げられる。具体的には、メトキシメチル化グリコールウリル、ブトキシメチル化グリコールウリル、メトキシメチル化メラミン、ブトキシメチル化メラミン、メトキシメチル化ベンゾグワナミン、ブトキシメチル化ベンゾグワナミン、などの化合物であり、例えば、テトラメトキシメチルグリコールウリル、テトラブトキシメチルグリコールウリル、ヘキサメトキシメチルメラミンを挙げることができる。さらに、置換尿素系化合物として、メトキシメチル化尿素、ブトキシメチル化尿素、またはメトキシメチル化チオ尿素等の化合物であり、例えば、テトラメトキシメチル尿素、テトラブトキシメチル尿素を挙げることができる。また、これらの化合物の縮合体も使用することができる。フェノール系化合物として、例えば、テトラヒドロキシメチルビフェノール、テトラメトキシメチルビフェノール、テトラヒドロキシメチルビスフェノール、テトラメトキシメチルビスフェノール、及び下記式で表される化合物等を挙げることができる。
上記R11、R12、R13、及びR14は水素原子又は炭素数1乃至10のアルキル基であり、これらのアルキル基は上述の例示を用いることができる。n1は1~4の整数であり、n2は1~(5-n1)の整数であり、(n1+n2)は2~5の整数を示す。n3は1~4の整数であり、n4は0~(4-n3)であり、(n3+n4)は1~4の整数を示す。オリゴマー及びポリマーは繰り返し単位構造の数が2~100、又は2~50の範囲で用いることができる。
架橋剤の添加量は、使用する塗布溶媒、使用する基板、要求される溶液粘度、要求される膜形状などにより変動するが、全固形分に対して0.001質量%以上、0.01質量%以上、0.05質量%以上、0.5質量%以上、又は1.0質量%以上であり、80質量%以下、50質量%以下、40質量%以下、20質量%以下、又は10質量%以下である。これら架橋剤は自己縮合による架橋反応を起こすこともあるが、本発明の上記重合体中に架橋性置換基が存在する場合は、それらの架橋性置換基と架橋反応を起こすことができる。
本発明に係るレジスト下層膜形成組成物は、酸及び/又は酸発生剤を含むことができる。
酸は一種のみを使用することができ、または二種以上を組み合わせて使用することができる。配合量は全固形分に対して、通常0.0001乃至20質量%、好ましくは0.0005乃至10質量%、さらに好ましくは0.01乃至5質量%である。
熱酸発生剤としては、2,4,4,6-テトラブロモシクロヘキサジエノン、ベンゾイントシレート、2-ニトロベンジルトシレート、K-PURE〔登録商標〕CXC-1612、同CXC-1614、同TAG-2172、同TAG-2179、同TAG-2678、同TAG2689、同TAG2700(King Industries社製)、及びSI-45、SI-60、SI-80、SI-100、SI-110、SI-150(三新化学工業(株)製)その他、トリフルオロ酢酸の第4級アンモニウム塩、有機スルホン酸アルキルエステル等が挙げられる。
酸発生剤が使用される場合、その割合としては、レジスト下層膜形成組成物の固形分100質量部に対して、0.01乃至10質量部、または0.1乃至8質量部、または0.5乃至5質量部である。
本発明のレジスト下層膜形成組成物は、さらに界面活性剤を含有することができる。前記界面活性剤としては、例えば、ポリオキシエチレンラウリルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンセチルエーテル、ポリオキシエチレンオレイルエーテル等のポリオキシエチレンアルキルエーテル類、ポリオキシエチレンオクチルフェニルエーテル、ポリオキシエチレンノニルフェニルエーテル等のポリオキシエチレンアルキルアリールエーテル類、ポリオキシエチレン・ポリオキシプロピレンブロックコポリマー類、ソルビタンモノラウレート、ソルビタンモノパルミテート、ソルビタンモノステアレート、ソルビタンモノオレエート、ソルビタントリオレエート、ソルビタントリステアレート等のソルビタン脂肪酸エステル類、ポリオキシエチレンソルビタンモノラウレート、ポリオキシエチレンソルビタンモノパルミテート、ポリオキシエチレンソルビタンモノステアレート、ポリオキシエチレンソルビタントリオレエート、ポリオキシエチレンソルビタントリステアレート等のポリオキシエチレンソルビタン脂肪酸エステル類等のノニオン系界面活性剤、エフトップ〔登録商標〕EF301、同EF303、同EF352(三菱マテリアル電子化成(株)製)、メガファック〔登録商標〕F171、同F173、同R-30、同R-30-N、同R-40、同R-40-LM(DIC(株)製)、フロラードFC430、同FC431(住友スリーエム(株)製)、アサヒガード〔登録商標〕AG710、サーフロン〔登録商標〕S-382、同SC101、同SC102、同SC103、同SC104、同SC105、同SC106(旭硝子(株)製)等のフッ素系界面活性剤、オルガノシロキサンポリマーKP341(信越化学工業(株)製)を挙げることができる。これらの界面活性剤から選択された1種類を添加してもよいし、2種以上を組合せて添加することもできる。前記界面活性剤の含有割合は、本発明のレジスト下層膜形成組成物から後述する溶剤を除いた固形分に対して、例えば0.01質量%乃至5質量%である。
本発明に係るポリマー(X)は、膜材料(Y)の架橋剤としても使用することができる。すなわち、本発明に係るレジスト下層膜形成組成物は、ポリマー(X)と架橋反応可能な膜材料(Y)を更に含む。膜材料(Y)は、ポリマー(X)と架橋反応可能な膜材料であると言える。
(Tはポリマーの主鎖に脂肪族環を有する繰り返し単位構造を表し、Eはエポキシ基又はエポキシ基を有する有機基を表す。)
前記脂肪族環は、例えば4乃至10個の炭素原子が環状に連結したものであり、特に6個の炭素原子が環状に連結したものである。脂肪族環は、置換基E(エポキシ基又はエポキシ基を有する有機基)以外に他の置換基を有することができる。そのような置換基としては、炭素原子数1乃至10のアルキル基、炭素原子数6乃至20のアリール基、ハロゲン原子、ニトロ基、及びアミノ基等が挙げられる。
上記式(1)で表される脂環式エポキシポリマーは、重量平均分子量が600~1,000,000、好ましくは1,000~200,000である。上記式(1)で表される脂環式エポキシポリマー(A)の繰り返し単位の数は2~3,000、又は3~600である。
[式中、2つのR1はそれぞれ独立に炭素原子数1乃至10のアルキル基、炭素原子数2乃至6のアルケニル基、芳香族炭化水素基、ハロゲン原子、ニトロ基又はアミノ基を表し、2つのR2はそれぞれ独立に水素原子、炭素原子数1乃至10のアルキル基、炭素原子数2乃至6のアルケニル基、アセタール基、アシル基又はグリシジル基を表し、R3は置換基を有してもよい芳香族炭化水素基を表し、R4は水素原子、フェニル基又はナフチル基を表し、同一の炭素原子と結合するR3とR4がそれぞれフェニル基を表すとき互いに結合してフルオレン環を形成してもよく、式(1b)において2つのR3が表す基及び2つのR4が表す原子又は基は互いに異なっていてもよく、2つのkはそれぞれ独立に0又は1を表し、mは3乃至500の整数を表し、n、n1及びn2は2乃至500の整数を表し、pは3乃至500の整数を表し、Xは単結合又はヘテロ原子を表し、2つのQはそれぞれ独立に下記式(2):
(式中、2つのR1、2つのR2、2つのR3、2つのR4、2つのk、n1、n2及びXは式(1b)と同義であり、2つのQ1はそれぞれ独立に前記式(2)で表される構造単位を表す。)で表される構造単位を表す。]
で表される繰り返し構造単位のうちいずれか1つ又は2つ以上を有するポリマーが挙げられる。
(式(1)中、
R1及びR2はそれぞれ水素原子、ハロゲン基、ニトロ基、アミノ基、ヒドロキシ基、炭素原子数1乃至10のアルキル基、炭素原子数2乃至10のアルケニル基、炭素原子数6乃至40のアリール基、及びそれらの組み合わせからなる群より選択され、かつ、該アルキル基、該アルケニル基又は該アリール基は、エーテル結合、ケトン結合若しくはエステル結合を含んでいても良い基を表し、
R3は水素原子、炭素原子数1乃至10のアルキル基、炭素原子数2乃至10のアルケニル基、炭素原子数6乃至40のアリール基、及びそれらの組み合わせからなる群より選択され、かつ、該アルキル基、該アルケニル基又は該アリール基は、エーテル結合、ケトン結合若しくはエステル結合を含んでいても良い基を表し、
R4はハロゲン基、ニトロ基、アミノ基若しくはヒドロキシ基で置換されていても良い炭素原子数6乃至40のアリール基又は複素環基を表し、
R5は水素原子、又はハロゲン基、ニトロ基、アミノ基若しくはヒドロキシ基で置換されていても良い、炭素原子数1乃至10のアルキル基、炭素原子数6乃至40のアリール基又は複素環基を表し、そして
R4とR5はそれらが結合する炭素原子と一緒になって環を形成してもよく、
n1及びn2はそれぞれ1乃至3の整数である。)で表される単位構造を含むポリマーが挙げられる。
好ましくは、前記式(1)中、R1、R2、及びR3はそれぞれ水素原子を表し、そしてR4及びR5はそれらが結合する炭素原子と一緒になってフルオレン環を形成し、その際、該炭素原子は形成された該フルオレン環の9位の炭素原子である単位構造を含む、請求項1に記載のポリマーである。
(式(2)及び式(3)中、
R1、R2、R6、R7、及びR8はそれぞれ水素原子、ハロゲン基、ニトロ基、アミノ基、ヒドロキシ基、炭素原子数1乃至10のアルキル基、炭素原子数2乃至10のアルケニル基、炭素原子数6乃至40のアリール基、及びそれらの組み合わせからなる群から選択され、かつ、該アルキル基、該アルケニル基又は該アリール基は、エーテル結合、ケトン結合若しくはエステル結合を含んでいても良い基を表し、
R3は水素原子、炭素原子数1乃至10のアルキル基、炭素原子数2乃至10のアルケニル基、炭素原子数6乃至40のアリール基、及びそれらの組み合わせからなる群から選択され、かつ、該アルキル基、該アルケニル基又は該アリール基は、エーテル結合、ケトン結合若しくはエステル結合を含んでいても良い基を表し、
R4はハロゲン基、ニトロ基、アミノ基若しくはヒドロキシ基で置換されていても良い炭素原子数6乃至40のアリール基又は複素環基を表し、
R5は水素原子、又はハロゲン基、ニトロ基、アミノ基若しくはヒドロキシ基で置換されていても良い、炭素原子数1乃至10のアルキル基、炭素原子数6乃至40のアリール基又は複素環基を表し、そして
R4とR5はそれらが結合する炭素原子と一緒になって環を形成してもよく、
n1及びn2はそれぞれ1乃至3の整数であり、
n3乃至n5はそれぞれ1乃至4の整数である。)で表される単位構造を含むポリマーである。
好ましくは、上記ビシクロ環化合物がジシクロペンタジエン、置換ジシクロペンタジエン、テトラシクロ[4.4.0.12,5.17,10]ドデカ-3,8-ジエン、又は置換テトラシクロ[4.4.0.12,5.17,10]ドデカ-3,8-ジエンである。
(式中、R1乃至R14は水素原子の置換基であり、それぞれ独立にハロゲン基、ニトロ基、アミノ基若しくはヒドロキシ基、又はそれらの基で置換されていても良い炭素原子数1乃至10のアルキル基若しくは炭素原子数6乃至40のアリール基であり、Arは炭素原子数6乃至40の芳香環基であり、n1、n2、n5、n6、n9、n10、n13、n14及びn15はそれぞれ0乃至3の整数であり、n3、n4、n7、n8、n11及びn12はそれぞれ0乃至4の整数である。)
好ましくは、上記式(3)中、Arがフェニル基又はナフチル基である。
(式(1)中、Aはポリヒドロキシベンゼンに由来するヒドロキシ基置換フェニレン基であり、Bは2~4個のベンゼン環が縮合した1価の縮合芳香族炭化水素環基である。)の単位構造を含むポリマーが挙げられる。
好ましくは、Aがカテコール、レソルシノール、ヒドロキノン、ピロガロール、ヒドロキシキノール、又はフロログルシノールに由来するヒドロキシ基置換フェニレン基である。
好ましくは、Bの縮合芳香族炭化水素環基がナフタレン環基、アントラセン環基、又はピレン環基である。
好ましくは、Bの縮合芳香族炭化水素環基がハロゲン基、ヒドロキシル基、ニトロ基、アミノ基、カルボキシル基、カルボン酸エステル基、二トリル基、又はこれらの組み合わせを置換基として有するものである。
(式(1)中、Ar1、及びAr2はそれぞれベンゼン環、又はナフタレン環を表し、R1及びR2はそれぞれこれら環上の水素原子の置換基でありハロゲン基、ニトロ基、アミノ基、ヒドロキシ基、炭素原子数1乃至10のアルキル基、炭素原子数2乃至10のアルケニル基、炭素原子数6乃至40のアリール基、及びそれらの組み合わせからなる群より選択され、かつ、該アルキル基、該アルケニル基及び該アリール基は、エーテル結合、ケトン結合、若しくはエステル結合を含んでいてもよい有機基を表し、
R3は水素原子、炭素原子数1乃至10のアルキル基、炭素原子数2乃至10のアルケニル基、炭素原子数6乃至40のアリール基、及びそれらの組み合わせからなる群より選択され、かつ、該アルキル基、該アルケニル基及びアリール基は、エーテル結合、ケトン結合、若しくはエステル結合を含んでいてもよい有機基を表し、
R4は炭素原子数6乃至40のアリール基及び複素環基からなる群より選択され、かつ、該アリール基及び該複素環基は、ハロゲン基、ニトロ基、アミノ基、炭素原子数1乃至10のアルキル基、炭素原子数1乃至10のアルコキシ基、炭素原子数6乃至40のアリール基、ホルミル基、カルボキシル基、又は水酸基で置換されていてもよい有機基を表し、
R5は水素原子、炭素原子数1乃至10のアルキル基、炭素原子数6乃至40のアリール基、及び複素環基からなる群より選択され、かつ、該アルキル基、該アリール基及び該複素環基は、ハロゲン基、ニトロ基、アミノ基、若しくは水酸基で置換されていてもよい有機基を表し、そしてR4とR5はそれらが結合する炭素原子と一緒になって環を形成していてもよい。n1及びn2はそれぞれ0乃至3の整数である。)で表される単位構造(A)を含むポリマーが挙げられる。
好ましくは、上記式(1)のR3が水素原子又はフェニル基である。
好ましくは、上記単位構造(A)においてAr1とAr2は、いずれか一方がベンゼン環であり他方がナフタレン環である単位構造(a1)を含む。
好ましくは、上記単位構造(A)においてAr1とAr2は、共にベンゼン環となる単位構造(a2)を含む。
好ましくは、単位構造(a1)と単位構造(a2)を含む共重合体である。
(式(2)中、R6は炭素原子数6乃至40のアリール基及び複素環基からなる群より選択され、かつ、該アリール基及び該複素環基は、ハロゲン基、ニトロ基、アミノ基、炭素原子数1乃至10のアルキル基、炭素原子数1乃至10のアルコキシ基、炭素原子数6乃至40のアリール基、ホルミル基、カルボキシル基、又は水酸基で置換されていてもよい有機基を表し、R7は水素原子、炭素原子数1乃至10のアルキル基、炭素原子数6乃至40のアリール基、及び複素環基からなる群より選択され、かつ、該アルキル基、該アリール基及び該複素環基は、ハロゲン基、ニトロ基、アミノ基、若しくは水酸基で置換されていてもよい有機基を表し、そしてR6とR7はそれらが結合する炭素原子と一緒になって環を形成していてもよい。)を含む共重合体である。
好ましくは、単位構造(a1)と単位構造(B)を含む共重合体である。
(式(1)中、R1、R2、及びR3は環の水素原子の置換基であって、それぞれ独立に、ハロゲン基、ニトロ基、アミノ基、水酸基、炭素数1乃至10のアルキル基、炭素数2乃至10のアルケニル基、炭素数6乃至40のアリール基、又はエーテル結合、ケトン結合、若しくはエステル結合を含んでいても良いそれらの組み合わせである。R4は水素原子、炭素数1乃至10のアルキル基、炭素数2乃至10のアルケニル基、炭素数6乃至40のアリール基、又はエーテル結合、ケトン結合、若しくはエステル結合を含んでいても良いそれらの組み合わせである。R5は水素原子、又はハロゲン基、ニトロ基、アミノ基、ホルミル基、カルボキシル基、カルボン酸アルキルエステル基、フェニル基、炭素数1乃至10のアルコキシ基、若しくは水酸基で置換されていても良い炭素数6乃至40のアリール基、又は複素環基であり、R6は水素原子、又はハロゲン基、ニトロ基、アミノ基、ホルミル基、カルボキシル基、カルボン酸アルキルエステル基、若しくは水酸基で置換されていても良い炭素数1乃至10のアルキル基、炭素数6乃至40のアリール基、又は複素環基であり、あるいはR5とR6はそれらが結合する炭素原子と一緒になって環を形成していても良い。環A及び環Bはそれぞれベンゼン環、ナフタレン環、又はアントラセン環を示す。n1、n2、及びn3はそれぞれ0以上で、且つ環に置換できる最大の数までの整数である。)で表される単位構造を有するポリマーが挙げられる。
好ましくは、R5が水素原子、又はハロゲン基、ニトロ基、アミノ基、ホルミル基、カルボキシル基、カルボン酸アルキルエステル基、フェニル基、炭素数1乃至10のアルコキシ基、若しくは水酸基で置換されていても良いフェニル基、ナフチル基、アントリル基、又はピレニル基であり、R6が水素原子である。
[式中、2つのR1はそれぞれ独立に炭素原子数1乃至10のアルキル基、炭素原子数2乃至6のアルケニル基、芳香族炭化水素基、ハロゲン原子、ニトロ基又はアミノ基を表し、2つのR2はそれぞれ独立に水素原子、炭素原子数1乃至10のアルキル基、炭素原子数2乃至6のアルケニル基、アセタール基、アシル基又はグリシジル基を表し、R3は置換基を有してもよい芳香族炭化水素基を表し、R4は水素原子、フェニル基又はナフチル基を表し、同一の炭素原子と結合するR3とR4がそれぞれフェニル基を表すとき互いに結合してフルオレン環を形成してもよく、式(1b)において2つのR3が表す基及び2つのR4が表す原子又は基は互いに異なっていてもよく、2つのkはそれぞれ独立に0又は1を表し、mは3乃至500の整数を表し、n、n1及びn2は2乃至500の整数を表し、pは3乃至500の整数を表し、Xは単結合又はヘテロ原子を表し、2つのQはそれぞれ独立に下記式(2):
(式中、2つのR1、2つのR2、2つのR3、2つのR4、2つのk、n1、n2及びXは式(1b)と同義であり、2つのQ1はそれぞれ独立に前記式(2)で表される構造単位を表す。)
で表される構造単位を表す。]
で表される繰り返し構造単位のうちいずれか1つ又は2つ以上を有するポリマーが挙げられる。
(式(1)中、R1乃至R4はそれぞれ独立に水素原子又はメチル基を示す。X1はアルキル基、アミノ基、又はヒドロキシル基で置換されていても良い少なくとも一つのアリーレン基を含む二価の有機基を示す。)で表される単位構造を含むポリマーが挙げられる。
〔式(2)中、A1はフェニレン基又はナフチレン基を表す。A2はフェニレン基、ナフチレン基、又は式(3):
(式(3)中、A3及びA4はそれぞれ独立にフェニレン基又はナフチレン基を表す。点線は結合を表す。)で示される有機基を表す。点線は結合を表す。〕で表される有機基である。
(式(1)中、Aは炭素原子数6乃至40の芳香族化合物から誘導される二価基を示し、b1は炭素原子数1乃至16のアルキル基を示し、b2は水素原子又は炭素原子数1乃至9のアルキル基を示す。)で表される単位構造を含むものである。
好ましくは、Aがアリールアミン化合物、フェノール化合物、又はその両者を含む芳香族化合物から誘導される二価基である。
好ましくは、Aがアニリン、ジフェニルアミン、フェニルナフチルアミン、ヒドロキシジフェニルアミン、カルバゾール、フェノール、N,N’-ジフェニルエチレンジアミン、N,N’-ジフェニル-1,4-フェニレンジアミン、又は多核フェノールから誘導される二価基である。
好ましくは、多核フェノールがジヒドロキシベンゼン、トリヒドロキシベンゼン、ヒドロキシナフタレン、ジヒドロキシナフタレン、トリヒドロキシナフタレン、トリス(4-ヒドロキシフェニル)メタン、トリス(4-ヒドロキシフェニル)エタン、2,2’-ビフェノール、又は1,1,2,2-テトラキス(4-ヒドロキシフェニル)エタンである。
(式(2)中、a1及びa2はそれぞれ置換されていても良いベンゼン環又はナフタレン環を示し、R1は第2級アミノ基もしくは第3級アミノ基、置換されていても良い炭素原子数1乃至10の二価炭化水素基、アリーレン基、又はこれらの基が任意に結合した二価の基を示す。b3は炭素原子数1乃至16のアルキル基を示し、b4は水素原子又は炭素原子数1乃至9のアルキル基を示す。)で表される単位構造を含むものである。
[式(1a)及び(1b)中、2つのR1はそれぞれ独立に炭素原子数1乃至10のアルキル基、炭素原子数2乃至6のアルケニル基、芳香族炭化水素基、ハロゲン原子、ニトロ基又はアミノ基を表し、2つのR2はそれぞれ独立に水素原子、炭素原子数1乃至10のアルキル基、炭素原子数2乃至6のアルケニル基、アセタール基、アシル基又はグリシジル基を表し、R3は置換基を有してもよい芳香族炭化水素基又は複素環基を表し、R4は水素原子、フェニル基又はナフチル基を表し、同一の炭素原子と結合するR3とR4がそれぞれフェニル基を表すとき互いに結合してフルオレン環を形成してもよく、2つのkはそれぞれ独立に0又は1を表し、mは3乃至500の整数を表し、pは3乃至500の整数を表し、Xはベンゼン環を表し、該ベンゼン環と結合する2つの-C(CH3)2-基はメタ位又はパラ位の関係にある。]
で表される繰り返し構造単位を有するポリマーが挙げられる。
好ましくは、前記R3が表す芳香族炭化水素基はフェニル基、ナフチル基、アントリル基又はピレニル基である。
好ましくは、ポリ(エポキシド)樹脂が3.5より大きいエポキシ官能価を有する。
[式(1)中、
は単結合又は二重結合を表し、
X1は、-N(R1)-又は-CH(R1)-を表し、
X2は、-N(R2)-又は-CH(R2)-を表し、
X3は、-N=、-CH=、-N(R3)-又は-CH(R3)-を表し、
X4は、-N=、-CH=、-N(R4)-又は-CH(R4)-を表し、
R1、R2、R3及びR4は同一又は異なり、それぞれ水素原子、C1~20の直鎖状、分岐状もしくは環状のアルキル基、C6~20のアリール基、C2~10のアルケニル基、C2~10のアルキニル基、カルボキシル基又はシアノ基を表し、上記アルキル基及びアリール基はC1~6のアシル基、C1~6のアルコキシ基、C1~6のアルコキシカルボニル基、アミノ基、グリシジル基又はヒドロキシ基で置換されていてもよく、且つ、酸素原子又は硫黄原子で中断されていてもよく、
R5、R6、R9及びR10は同一又は異なり、それぞれ水素原子、ヒドロキシ基、C1~6のアシル基、C1~6のアルコキシ基、C1~6のアルコキシカルボニル基、C1~10の直鎖状、分岐状もしくは環状のアルキル基、C6~20のアリール基、C2~20のアルケニル基又はC2~10のアルキニル基を表し、上記アシル基、アルコキシ基、アルコキシカルボニル基、アルキル基、アリール基、アルケニル基及びアルキニル基は、アミノ基、ニトロ基、シアノ基、ヒドロキシ基、グリシジル基及びカルボキシル基からなる群より選択される基を1つ又は複数有していても良く、
R7及びR8は同一又は異なり、それぞれベンゼン環又はナフタレン環を表し、
n及びoは0又は1である。]
式(2)
[式(2)中、
は単結合又は二重結合を表し、
X1は、-N(R1)-、-CH(R1)-、-N<又は-CH<を表し、
X2は、-N(R2)-、-CH(R2)-、-N<又は-CH<を表し、
X3は、-N=、-CH=、-N(R3)-、-CH(R3)-、-N<又は-CH<を表し、
X4は、-N=、-CH=、-N(R4)-、-CH(R4)-、-N<又は-CH<を表し、
R1、R2、R3及びR4は同一又は異なり、それぞれ水素原子、C1~20の直鎖状、分岐状もしくは環状のアルキル基、C6~20のアリール基、C2~10のアルケニル基、C2~10のアルキニル基、カルボキシル基又はシアノ基を表し、上記アルキル基及びアリール基はC1~6のアシル基、C1~6のアルコキシ基、C1~6のアルコキシカルボニル基、アミノ基、グリシジル基又はヒドロキシ基で置換されていてもよく、且つ、酸素原子又は硫黄原子で中断されていてもよく、
R5、R6、R9及びR10は同一又は異なり、それぞれ水素原子、ヒドロキシ基、C1~6のアシル基、C1~6のアルコキシ基、C1~6のアルコキシカルボニル基、C1~10の直鎖状、分岐状もしくは環状のアルキル基、C6~20のアリール基、C2~20のアルケニル基又はC2~10のアルキニル基を表し、上記アシル基、アルコキシ基、アルコキシカルボニル基、アルキル基、アリール基、アルケニル基及びアルキニル基は、アミノ基、ニトロ基、シアノ基、ヒドロキシ基、グリシジル基及びカルボキシル基からなる群より選択される基を1つ又は複数有していても良く、
R7及びR8は同一又は異なり、それぞれベンゼン環又はナフタレン環を表し、
n及びoは0又は1であり、
B1とB2は同一又は異なり、それぞれ水素原子、酸素原子もしくは硫黄原子で中断されていてもよいC1~20の直鎖状、分岐状もしくは環状のアルキル基又はC6~40のアリール基及びC6~40の複素環基からなる群より選択される芳香族化合物由来の基を表し、B1とB2はこれらが結合する炭素原子と一緒になって環を形成してもよく、前記芳香族化合物由来の基の水素原子は、C1~20のアルキル基、フェニル基、縮合環基、複素環基、ヒドロキシ基、アミノ基、エーテル基、アルコキシ基、シアノ基、ニトロ基又はカルボキシル基で置換されていてもよい。]
式(3)
[式(3)中、
は単結合又は二重結合を表し、
X1は、-N<又は-CH<を表し、
X2は、-N<又は-CH<を表し、
X3は、-N=、-CH=、-N(R3)-又は-CH(R3)-を表し、
X4は、-N=、-CH=、-N(R4)-又は-CH(R4)-を表し、
R3及びR4は同一又は異なり、それぞれ水素原子、C1~20の直鎖状、分岐状もしくは環状のアルキル基、C6~20のアリール基、C2~10のアルケニル基、C2~10のアルキニル基、カルボキシル基又はシアノ基を表し、上記アルキル基及びアリール基はC1~6のアシル基、C1~6のアルコキシ基、C1~6のアルコキシカルボニル基、アミノ基、グリシジル基又はヒドロキシ基で置換されていてもよく、且つ、酸素原子又は硫黄原子で中断されていてもよく、
R5、R6、R9及びR10は同一又は異なり、それぞれ水素原子、ヒドロキシ基、C1~6のアシル基、C1~6のアルコキシ基、C1~6のアルコキシカルボニル基、C1~10の直鎖状、分岐状もしくは環状のアルキル基、C6~20のアリール基、C2~20のアルケニル基又はC2~10のアルキニル基を表し、上記アシル基、アルコキシ基、アルコキシカルボニル基、アルキル基、アリール基、アルケニル基及びアルキニル基は、アミノ基、ニトロ基、シアノ基、ヒドロキシ基、グリシジル基及びカルボキシル基からなる群より選択される基を1つ又は複数有していても良く、
R7及びR8は同一又は異なり、それぞれベンゼン環又はナフタレン環を表し、
n及びoは0又は1であり、
p及びqは0~20の整数であり、
p個のメチレン基及びq個のメチレン基は2個以上の場合には酸素原子又は硫黄原子で中断されていてもよく、
B3は直接結合、又はC1~20のアルキル基、フェニル基、縮合環基、複素環基、ヒドロキシ基、アミノ基、エーテル基、アルコキシ基、シアノ基、ニトロ基もしくはカルボキシル基で置換されていてもよいC6~40の芳香族化合物由来の基を表す。]
かかるエポキシ付加体は例えば以下に例示することができる。
(式中R1及びR2はそれぞれ、水素原子、炭素原子数1~6のアルキル基、炭素原子数3~6のアルケニル基、ベンジル基またはフェニル基を表し、そして、前記フェニル基は、炭素原子数1~6のアルキル基、ハロゲン原子、炭素原子数1~6のアルコキシ基、ニトロ基、シアノ基、水酸基、及び炭素原子数1~6のアルキルチオ基からなる群から選ばれる基で置換されていてもよく、また、R1とR2は互いに結合して炭素原子数3~6の環を形成していてもよく、R3は炭素原子数1~6のアルキル基、炭素原子数3~6のアルケニル基、ベンジル基またはフェニル基を表し、そして、前記フェニル基は、炭素原子数1~6のアルキル基、ハロゲン原子、炭素原子数1~6のアルコキシ基、ニトロ基、シアノ基、水酸基、及び炭素原子数1~6のアルキルチオ基からなる群から選ばれる基で置換されていてもよい)を表し、Qは式(6)または式(7):
(式中Q1は炭素原子数1~10のアルキレン基、フェニレン基、ナフチレン基、またはアントリレン基を表し、そして、前記フェニレン基、ナフチレン基、及びアントリレン基は、それぞれ、炭素原子数1~6のアルキル基、ハロゲン原子、炭素原子数1~6のアルコキシ基、ニトロ基、シアノ基、水酸基、及び炭素原子数1~6のアルキルチオ基からなる群から選ばれる基で置換されていてもよく、n1及びn2はそれぞれ0または1の数を表し、X2は式(2)、式(3)または式(5)を表す)を表す)で表される構造を有するポリマーが挙げられる。
(式中、R1、R2、Qは、上で定義されたと同じ意味を表す)
又は、式(13):
(式中、X1は上で定義されたと同じ意味を表し、Yは炭素原子数1~6のアルキル基、ハロゲン原子、炭素原子数1~6のアルコキシ基、ニトロ基、シアノ基、水酸基または炭素原子数1~6のアルキルチオ基を表し、mは0乃至4の整数を表し、そしてmが2乃至4の場合前記Yは同一であっても異なっていてもよい)
で表される構造である。
{式中、R1及びR2はそれぞれ、水素原子、メチル基、エチル基又はハロゲン原子を表し、A1、A2、A3、A4、A5、及びA6は、それぞれ、水素原子、メチル基またはエチル基を表し、Qは式(3)または式(4):
[式中、Q1は炭素原子数1~15のアルキレン基、フェニレン基、ナフチレン基、またはアントリレン基を表し、そして、前記フェニレン基、ナフチレン基、及びアントリレン基は、それぞれ、炭素原子数1~6のアルキル基、ハロゲン原子、炭素原子数1~6のアルコキシ基、ニトロ基、シアノ基、ヒドロキシル基、及び炭素原子数1~6のアルキルチオ基からなる群から選ばれる基で置換されていてもよく、n1及びn2はそれぞれ0または1の数を表し、X1は式(5)、(6)または式(7):
(式中、R3及びR4はそれぞれ、水素原子、炭素原子数1~6のアルキル基、炭素原子数3~6のアルケニル基、ベンジル基またはフェニル基を表し、そして、前記フェニル基は、炭素原子数1~6のアルキル基、ハロゲン原子、炭素原子数1~6のアルコキシ基、ニトロ基、シアノ基、ヒドロキシル基、及び炭素原子数1~6のアルキルチオ基からなる群から選ばれる基で置換されていてもよく、また、R3とR4は互いに結合して炭素原子数3~6の環を形成していてもよく、R5は炭素原子数1~6のアルキル基、炭素原子数3~6のアルケニル基、ベンジル基またはフェニル基を表し、そして、前記フェニル基は、炭素原子数1~6のアルキル基、ハロゲン原子、炭素原子数1~6のアルコキシ基、ニトロ基、シアノ基、ヒドロキシル基、及び炭素原子数1~6のアルキルチオ基からなる群から選ばれる基で置換されていてもよい。)を表す。]を表す。}で表される繰り返しの単位構造を有するポリマーが挙げられる。
[式中、Q2は式(15)、式(16)または式(17):
(式中、Y、m、R3、R4及びR5は前記と同義である。)を表し、Q3は式(18):
(式中、Q4は炭素原子数1~15のアルキレン基を表し、n3及びn4はそれぞれ0または1の数を表す。)を表す。]で表される繰り返しの単位構造を有するポリマーである。
(上記式中、
Xは水素原子又は芳香族縮合環を表わし、
Yは芳香族縮合環を表わし、XとYは互いに結合して縮合環を形成していても良く、
R1、R2、R3、R4、R5、R10、R11及びR12は、それぞれ、水素原子、ハロゲン原子又は炭素原子数1ないし3のアルキル基を表わし、
R6、R7及びR8は、それぞれ、水素原子又は炭素原子数1ないし10の鎖状又は環状のアルキル基を表わし、
R9は炭素原子数1ないし10の鎖状又は環状のアルキル基又は炭素原子数6ないし20の芳香族基を表わし、また、
R7とR8は互いに結合して環を形成していても良く、
M及びQはそれぞれ直接結合又は連結基を表わし、
nは0又は1の整数を表わす。)で表わされる単位構造からなる群から選ばれた少なくとも1種の単位構造を含むポリマー又はそれらポリマーの組み合わせからなり、該ポリマーを構成する全ての単位構造の総数を1.0とした場合、式(1)で表わされる単位構造の数(a)の割合、式(2)で表わされる単位構造の数(b)の割合及び式(3)で表わされる単位構造の数(c)の割合が、0.3≦a≦0.95、0.005≦b≦0.7、0≦c≦0.45となるポリマーが挙げられる。
好ましくは、式(1)及び式(3)で表わされる単位構造を含むポリマーであって、該ポリマーを構成する全ての単位構造の総数を1.0とした場合、式(1)で表わされる単位構造の数(a)の割合及び式(3)で表わされる単位構造の数(c)の割合が、0.35≦a+c≦1、0.3≦a≦0.95、0.05≦c≦0.7となるポリマーである。
好ましくは、式(1)、式(2)及び式(3)で表わされる単位構造を含むポリマーであって、該ポリマーを構成する全ての単位構造の総数を1.0とした場合、式(1)で表わされる単位構造の数(a)の割合、式(2)で表わされる単位構造の数(b)の割合及び式(3)で表わされる単位構造の数(c)の割合が、0.355≦a+b+c≦1、0.3≦a≦0.9、0.005≦b≦0.65、0.05≦c≦0.65となるポリマーである。
好ましくは、式(1)で表わされる単位構造が、ビニルナフタレン、アセナフチレン、ビニルアントラセン、ビニルカルバゾール、又はそれらの誘導体からなる単位構造で
ある。
(式(2)中、2つのArはそれぞれアリール基を表し、該アリール基は置換基として少なくとも1つのヒドロキシ基を有し、Qはベンゼン環又はナフタレン環を少なくとも1つ有する二価の連結基、メチレン基又は単結合を表す。)で表される化合物が挙げられる。その分子量は、例えば150乃至600である。
(式(2-6)中、mは0~3の整数を表す)
(式中、Rはそれぞれ独立に炭素原子数1乃至10のアルキル基を表す。)
で表されるマロン酸ジエステルが1乃至6分子付加したフラーレン誘導体が挙げられる。
好ましくは、前記化合物の分子量が300乃至2,300である。
(式中、R1、R1a、R3、R5、R5a、及びR6aはそれぞれ炭素原子数1乃至10の飽和炭化水素基、炭素原子数6乃至40の芳香族炭化水素基、酸素原子、カルボニル基、イオウ原子、窒素原子、アミド基、アミノ基、又はそれらの組み合わせからなる基を示し、R2、R2a、R4、及びR6は、それぞれ水素原子、炭素原子数1乃至10の飽和炭化水素基、炭素原子数2乃至10の不飽和炭化水素基、酸素原子、カルボニル基、アミド基、アミノ基、又はそれらの組み合わせからなる基を示し、R2、R2a、R4、R6は1価の基を、R1、R1a、R3、R5a、及びR6aは2価の基を、R5は3価の基を示し、R7、R8、R9、R10及びR11はそれぞれ水素原子、又は炭素原子数1乃至10の飽和炭化水素基を示し、nは1乃至10の繰り返し単位数を示し、点線は隣接原子との化学結合を示す。)
好ましくは、化合物(E)が少なくとも一つの部分構造(I)と少なくとも一つの部分構造(II)とを含む化合物である。
好ましくは、上記R5a、及びR6aはそれぞれ炭素原子数1乃至10のアルキレン基、炭素原子数6乃至40のアリーレン基、酸素原子、カルボニル基、イオウ原子、又はそれらの組み合わせからなる2価の基である。
好ましくは、化合物(E)が部分構造(I)と部分構造(II)とをそれぞれ1乃至1000個の割合で含む。
好ましくは、上記化合物は、光分解性窒素含窒素構造及び/又は光分解性含イオウ構造と、炭化水素構造とが同一分子内に存在する化合物であるか、又は該構造が異なる分子に夫々存在する化合物の組合せである。
好ましくは、上記炭化水素構造が炭素原子数1~40の飽和又は不飽和基であり、直鎖、分岐又は環状の炭化水素基である。
好ましくは、上記光分解性含窒素構造が、紫外線照射により反応性含窒素官能基もしくは反応性炭素官能基を生じる構造であるか、又は紫外線照射により生じた反応性含窒素官能基もしくは反応性含炭素官能基を含む構造である。
好ましくは、上記光分解性含窒素構造が、イオウ原子を含んでいても良い光分解性含窒素構造であって、該構造はアジド構造、テトラアゾール構造、トリアゾール構造、イミダゾール構造、ピラゾール構造、アゾール構造、ジアゾ構造、又はそれらの組み合わせを含む構造である。
好ましくは、上記光分解性含イオウ構造が、紫外線照射により有機イオウラジカルもしくは炭素ラジカルを生じる構造であるか、又は紫外線照射により生じた有機イオウラジカルもしくは炭素ラジカルを含む構造である。
好ましくは、上記光分解性含イオウ構造が、窒素原子を含んでいても良い光分解性含イオウ構造であって、該構造はトリスルフィド構造、ジスルフィド構造、スルフィド構造、チオケトン構造、チオフェン構造、チオール構造、又はそれらの組み合わせを含む構造である。
(式(1)中、R1は、各々独立して炭素数1~30の2価の基であり、R2~R7は、各々独立して炭素数1~10の直鎖状、分岐状若しくは環状のアルキル基、炭素数6~10のアリール基、炭素数2~10のアルケニル基、チオール基又は水酸基であり、R5の少なくとも1つは水酸基又はチオール基であり、m2、m3及びm6は、各々独立して0~9の整数であり、m4及びm7は、各々独立して0~8の整数であり、m5は、1~9の整数であり、nは、0~4の整数であり、p2~p7は、各々独立して0~2の整数である。)
(式中、lは0~3の整数を表し、Ra~Rfはそれぞれ独立して水素原子又はフッ素置換されてもよい炭素数1~10のアルキル基、フェニル基、又はフェニルエチル基を表し、RaとRbが結合して環状化合物を形成してもよい。)
(式中、*は芳香環への結合部位を表し、Q1は炭素数1~30の直鎖状、分岐状の飽和又は不飽和の炭化水素基、炭素数4~20の脂環基、あるいは置換又は非置換のフェニル基、ナフチル基、アントラセニル基、又はピレニル基を表す。Q1が炭素数1~30の直鎖状、分岐状の飽和又は不飽和の炭化水素基を表す場合、Q1を構成するメチレン基が酸素原子又はカルボニル基に置換されていてもよい。)
(式中、**はカルボニル基への結合部位を表し、Rhは炭素数1~30の直鎖状、分岐状の飽和又は不飽和の炭化水素基を表し、Rhを構成するメチレン基が酸素原子又はカルボニル基に置換されていてもよい。)
(式中、**はカルボニル基への結合部位を表し、Riは水素原子又は炭素数1~10の直鎖状、分岐状の炭化水素基を表し、Rjは炭素数1~10の直鎖状、分岐状の炭化水素基、ハロゲン原子、ニトロ基、アミノ基、ニトリル基、炭素数1~10のアルコキシカルボニル基、あるいは炭素数1~10のアルカノイルオキシ基を表す。n3及びn4は芳香環上の置換基の数を表し、それぞれ0~7の整数を表す。ただし、n3+n4は0以上7以下である。n5は0~2を表す。)
(式中、Rは単結合、炭素数1~50の有機基、エーテル結合、-SO-基、又は-SO2-基であり、R1は下記一般式(1B)で示される基であり、m1及びm2は1≦m1≦5、1≦m2≦5、かつ2≦m1+m2≦8を満たす整数である。)
(式中、X1は下記一般式(1C)で示される基であり、Xは下記一般式(1D)で示される基である。)
(式中、(X)は前記Xとの結合箇所を示す。)
(式中、X2は炭素数1~10の二価有機基であり、n1は0又は1であり、n2は1又は2であり、X3は下記一般式(1E)で示される基であり、n5は0、1、又は2である。)
(式中、R10は水素原子又は炭素数1~10の飽和もしくは不飽和の炭化水素基であり、式中のベンゼン環上の水素原子は、メチル基又はメトキシ基で置換されていてもよい。)
(式中、Rは単結合、炭素数1~50の有機基、エーテル結合、-SO-基、又は-SO2-基であり、R2は下記一般式(2B)で示される基であり、m3及びm4は1≦m3≦5、1≦m4≦5、かつ2≦m3+m4≦8を満たす整数である。)
(式中、X11は下記一般式(2C)で示される基であり、X’は下記一般式(2D)で示される基である。)
(式中、(X’)は前記X’との結合箇所を示す。)
(式中、n3は0又は1であり、n4は1又は2であり、X4は下記一般式(2E)で示される基であり、n6は0、1、又は2である。)
(式中、R11は水素原子又は炭素数1~10の飽和もしくは不飽和の炭化水素基であり、式中のベンゼン環上の水素原子は、メチル基又はメトキシ基で置換されていてもよい。)
(式中、R101、R102、R103、R104はそれぞれ独立に水酸基であり、m100は1、2、又は3であり、R100は、m100が1のときは水素原子又は水酸基であり、m100が2のときは単結合又は下記一般式(3B)で示される基であり、m100が3のときは下記一般式(3C)で示される基であり、式中の芳香環上の水素原子はメチル基又はメトキシ基で置換されてもよい。m101は0又は1であり、m102は1又は2であり、m103は0又は1であり、m104は1又は2であり、m105は0又は1である。m101が0の場合、n101及びn102は0≦n101≦3、0≦n102≦3、かつ1≦n101+n102≦4を満たす整数であり、m101が1の場合、n101、n102、n103、及びn104は0≦n101≦2、0≦n102≦2、0≦n103≦2、0≦n104≦2、かつ2≦n101+n102+n103+n104≦8を満たす整数である。)
(式中、*は結合位置を示し、R106、R107は水素原子又は炭素数1~24のエステル結合を含まない有機基であり、R106とR107は結合して環状構造を形成してもよい。)
(式中、*は結合位置を示し、R108は水素原子又は炭素数1~15の有機基である。)
下記式(1):
(式(1)中、Ar1は炭素数6乃至50のアリーレン基又は複素環基を含む有機基を表す。)で表される単位構造、下記式(2):
(ただし、式(2)中、Ar2、Ar3、及びAr4はそれぞれ炭素数6乃至50のアリーレン基又は複素環基を含む有機基を表し、Tはカルボニル基またはスルホニル基を表す。)で表される単位構造、又は式(1)で表される単位構造及び式(2)で表される単位構造の組み合わせを含むポリマー。
(Y1)脂肪族環を含有する膜材料(例えば上記(a)(m))、
(Y2)ノボラック膜材料(例えば上記(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l))、
(Y3)ポリエーテル膜材料(例えば上記(z))、
(Y4)ポリエステル膜材料(例えば上記(o)(p))、
(Y5)架橋性化合物(A)と異なる化合物(例えば上記(m)(n)(r)(s)(t)(u)(v)(w)(x)(y))、
(Y6)芳香族縮合環を含有する膜材料(例えば上記(q))、
(Y7)アクリル樹脂、及び
(Y8)メタクリル樹脂
からなる群より選択される少なくとも一種を含む。
吸光剤としては例えば、「工業用色素の技術と市場」(CMC出版)や「染料便覧」(有機合成化学協会編)に記載の市販の吸光剤、例えば、C.I.Disperse Yellow 1,3,4,5,7,8,13,23,31,49,50,51,54,60,64,66,68,79,82,88,90,93,102,114及び124;C.I.Disperse Orange1,5,13,25,29,30,31,44,57,72及び73;C.I.Disperse Red 1,5,7,13,17,19,43,50,54,58,65,72,73,88,117,137,143,199及び210;C.I.Disperse Violet 43;C.I.Disperse Blue 96;C.I.Fluorescent Brightening Agent 112,135及び163;C.I.Solvent Orange2及び45;C.I.Solvent Red 1,3,8,23,24,25,27及び49;C.I.Pigment Green 10;C.I.Pigment Brown 2等を好適に用いることができる。上記吸光剤は通常、レジスト下層膜形成組成物の全固形分に対して10質量%以下、好ましくは5質量%以下の割合で配合される。
レオロジー調整剤は、主にレジスト下層膜形成組成物の流動性を向上させ、特にベーキング工程において、レジスト下層膜の膜厚均一性の向上やホール内部へのレジスト下層膜形成組成物の充填性を高める目的で添加される。具体例としては、ジメチルフタレート、ジエチルフタレート、ジイソブチルフタレート、ジヘキシルフタレート、ブチルイソデシルフタレート等のフタル酸誘導体、ジノルマルブチルアジペート、ジイソブチルアジペート、ジイソオクチルアジペート、オクチルデシルアジペート等のアジピン酸誘導体、ジノルマルブチルマレート、ジエチルマレート、ジノニルマレート等のマレイン酸誘導体、メチルオレート、ブチルオレート、テトラヒドロフルフリルオレート等のオレイン酸誘導体、またはノルマルブチルステアレート、グリセリルステアレート等のステアリン酸誘導体を挙げることができる。これらのレオロジー調整剤は、レジスト下層膜形成組成物の全固形分に対して通常30質量%未満の割合で配合される。
接着補助剤は、主に基板あるいはレジストとレジスト下層膜形成組成物の密着性を向上させ、特に現像においてレジストが剥離しないようにするための目的で添加される。具体例としては、トリメチルクロロシラン、ジメチルメチロールクロロシラン、メチルジフエニルクロロシラン、クロロメチルジメチルクロロシラン等のクロロシラン類、トリメチルメトキシシラン、ジメチルジエトキシシラン、メチルジメトキシシラン、ジメチルメチロールエトキシシラン、ジフエニルジメトキシシラン、フエニルトリエトキシシラン等のアルコキシシラン類、ヘキサメチルジシラザン、N,N’-ビス(トリメチルシリル)ウレア、ジメチルトリメチルシリルアミン、トリメチルシリルイミダゾール等のシラザン類、メチロールトリクロロシラン、γ-クロロプロピルトリメトキシシラン、γ-アミノプロピルトリエトキシシラン、γ-グリシドキシプロピルトリメトキシシラン等のシラン類、ベンゾトリアゾール、ベンズイミダゾール、インダゾール、イミダゾール、2-メルカプトベンズイミダゾール、2-メルカプトベンゾチアゾール、2-メルカプトベンゾオキサゾール、ウラゾール、チオウラシル、メルカプトイミダゾール、メルカプトピリミジン等の複素環式化合物や、1,1-ジメチルウレア、1,3-ジメチルウレア等の尿素、またはチオ尿素化合物を挙げることができる。これらの接着補助剤は、レジスト下層膜形成組成物の全固形分に対して通常5質量%未満、好ましくは2質量%未満の割合で配合される。
レジスト下層膜は、本発明に係るレジスト下層膜形成組成物を用いて、以下のように形成することができる。
半導体装置の製造に使用される基板(例えば、シリコンウエハー基板、シリコン/二酸化シリコン被覆基板、シリコンナイトライド基板、ガラス基板、ITO基板、ポリイミド基板、及び低誘電率材料(low-k材料)被覆基板等)の上に、スピナー、コーター等の適当な塗布方法により本発明のレジスト下層膜形成組成物を塗布し、その後、ホットプレート等の加熱手段を用いて焼成することによりレジスト下層膜が形成される。焼成する条件としては、焼成温度80℃乃至600℃、焼成時間0.3乃至60分間の中から適宜選択される。好ましくは、焼成温度150℃乃至350℃、焼成時間0.5乃至2分間である。焼成時の雰囲気気体としては空気を用いてもよく、窒素、アルゴン等の不活性ガスを用いることもできる。ここで、形成される下層膜の膜厚としては、例えば、10乃至1000nmであり、又は20乃至500nmであり、又は30乃至400nmであり、又は50乃至300nmである。また、基板として石英基板を用いれば、石英インプリントモールドのレプリカ(モールドレプリカ)を作製することができる。
本発明に係る半導体装置の製造方法は、
本発明に係るレジスト下層膜形成組成物を用いてレジスト下層膜を形成する工程、
形成されたレジスト下層膜の上にレジスト膜を形成する工程、
形成されたレジスト膜に対する光又は電子線の照射と現像によりレジストパターンを形成する工程、
形成されたレジストパターンを介して前記レジスト下層膜をエッチングし、パターン化する工程、及び
パターン化されたレジスト下層膜を介して半導体基板を加工する工程
を含む。
本発明に係るレジスト下層膜形成組成物を用いてレジスト下層膜を形成する工程、
形成されたレジスト下層膜の上にハードマスクを形成する工程、
形成されたハードマスクの上にレジスト膜を形成する工程、
形成されたレジスト膜に対する光又は電子線の照射と現像によりレジストパターンを形成する工程、
形成されたレジストパターンを介して前記ハードマスクをエッチングし、パターン化する工程、及び
パターン化されたハードマスクを介して前記レジスト下層膜をエッチングし、パターン化する工程、及び
パターン化されたレジスト下層膜を介して半導体基板を加工する工程
を含む。
上記のレジスト下層膜を形成する工程をナノインプリント法によって行うことも可能である。その方法は、
形成されたレジスト下層膜上に硬化性組成物を適用する工程、
前記硬化性組成物とモールドとを接触させる工程、
前記硬化性組成物に光又は電子線を照射して硬化膜とする工程、及び
前記硬化膜と前記モールドとを引き離す工程、
を含む。
レジスト下層膜の上に形成されるフォトレジストとしては露光に使用される光に感光するものであれば特に限定はない。ネガ型フォトレジスト及びポジ型フォトレジストのいずれも使用できる。ノボラック樹脂と1,2-ナフトキノンジアジドスルホン酸エステルとからなるポジ型フォトレジスト、酸により分解してアルカリ溶解速度を上昇させる基を有するバインダーと光酸発生剤からなる化学増幅型フォトレジスト、酸により分解してフォトレジストのアルカリ溶解速度を上昇させる低分子化合物とアルカリ可溶性バインダーと光酸発生剤とからなる化学増幅型フォトレジスト、及び酸により分解してアルカリ溶解速度を上昇させる基を有するバインダーと酸により分解してフォトレジストのアルカリ溶解速度を上昇させる低分子化合物と光酸発生剤からなる化学増幅型フォトレジストなどがある。例えば、シプレー社製商品名APEX-E、住友化学工業株式会社製商品名PAR710、及び信越化学工業株式会社製商品名SEPR430等が挙げられる。また、例えば、Proc.SPIE,Vol.3999,330-334(2000)、Proc.SPIE,Vol.3999,357-364(2000)、やProc.SPIE,Vol.3999,365-374(2000)に記載されているような、含フッ素原子ポリマー系フォトレジストを挙げることができる。
本工程は、本発明に係るレジスト下層膜の製造方法によって形成されたレジスト下層膜上に硬化性組成物を適用する工程である。硬化性組成物を適用する方法としては、例えば、インクジェット法、ディップコート法、エアーナイフコート法、カーテンコート法、ワイヤーバーコート法、グラビアコート法、エクストルージョンコート法、スピンコート法、スリットスキャン法等を用いることができる。硬化性組成物を液滴として適用するためにはインクジェット法が適しており、硬化性組成物を塗布するためにはスピンコート法が適している。本工程において、レジスト下層膜上に密着層及び/又は99質量%以下、又は50質量%以下のSiを含むシリコーン層を塗布又は蒸着により形成し、その上に硬化性組成物を適用することもできる。
本工程では、硬化性組成物とモールドとを接触させる。例えば、液体である硬化性組成物と、パターン形状を転写するための原型パターンを有するモールドとを接触させれば、硬化性組成物がモールド表面の微細パターンの凹部に充填された液膜が形成される。
また、モールドを引き剥がす際の衝撃によるレジストパターンの弾性変形で隣接レジストパターン同士が接触し、レジストパターンが癒着あるいは破損する場合もある。これは、パターン幅に対してパターン高さが2倍程度以下(アスペクト比2以下)とすることにより回避できることがある。
本工程では、硬化性組成物に光又は電子線を照射して硬化膜とする。すなわち、モールドの微細パターンに充填された硬化性組成物にモールドを介して光又は電子線を照射し、モールドの微細パターンに充填された硬化性組成物をその状態のまま硬化させることによって、パターン形状を有する硬化膜とする。
本工程では、硬化膜とモールドとを引き離す。パターン形状を有する硬化膜とモールドとを引き離し、モールド上に形成された微細パターンの反転パターンとなるパターン形状を有する硬化膜が自立した状態で得られる。
装置:東ソー株式会社製HLC-8320GPC
GPCカラム:TSKgel Super-MultiporeHZ-N (2本)
カラム温度:40℃
流量:0.35ml/分
溶離液:THF
標準試料:ポリスチレン
フラスコにTMOM-BP(本州化学(株)製)260.00g、プロピレングリコールモノメチルエーテル(以後PGMEと記載)1,430gを入れた。その後、窒素下で約90℃まで加熱、130.00gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)17.26gを滴下、約45時間後にメタノールと水で沈殿させて、乾燥させることでポリマー(1-I)を得た。なお、実際の構造単位は、メトキシメチル基を含む任意のROCH2-基とヒドロキシ基、又はROCH2-基同士が結合して架橋しているのであるが、その状態を化学式に示すと極めて煩雑になるため、構造単位のみを示すにとどめた。以下、同様である。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約4,500であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
フラスコにTMOM-BP(本州化学(株)製)68.99g、PGME379.44gを入れた。その後、窒素下で約90℃まで加熱、34.50gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)4.57gを滴下、約47.5時間後にメタノールと水で沈殿させて、乾燥させることでポリマー(1-2)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約5,400であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
フラスコにTMOM-BP(本州化学(株)製)30.00g、1-ブタノール(東京化成工業(株)製)165.07gを入れた。その後、窒素下で約90℃まで加熱、15.05gの1-ブタノールに溶解させたメタンスルホン酸(東京化成工業(株)製)1.99gを滴下、約81.5時間後にメタノールと水で沈殿させて、乾燥させることでポリマー(1-3)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約3,487であった。また、1-ブチル基の導入を1H-NMRにより確認した。得られた樹脂をPGMEに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
フラスコにTMOM-BP(本州化学(株)製)34.50g、TM-BIP-A33.16g、PGME379.44gを入れた。その後、窒素下で約90℃まで加熱、34.50gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)2.29gを滴下、約125.5時間後にメタノールと水で沈殿させて、乾燥させることでポリマー(1-4)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約4,296であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
フラスコにTMOM-BP(本州化学(株)製)34.50g、PL-LI(みどり化学(株)製)0.31g、PGME189.73gを入れた。その後、窒素下で約90℃まで加熱、17.25gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)2.29gを滴下、約48時間後にメタノールと水で沈殿させて、乾燥させることでポリマー(1-5)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約3,978であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
100mLフラスコにTMOM-BP(本州化学(株)製)10.00g、カルバゾール(東京化成工業(株)製)5.46g、PGME58.72gを入れた。その後、窒素下で90℃まで加熱、5gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)0.47gを滴下、約2時間後にメタノールで沈殿させて、乾燥させることでポリマー(1-6)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約4,000であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
100mLフラスコにTMOM-BP(本州化学(株)製)10.00g、N-フェニル-1-ナフチルアミン(東京化成工業(株)製)7.16g、PGME65.52gを入れた。その後、窒素下で90℃まで加熱、5gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)0.47gを滴下、約3時間後にメタノールで沈殿させて、乾燥させることでポリマー(1-7)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約4,500であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
100mLフラスコにTMOM-BP(本州化学(株)製)10.00g、9,9-ビス(4-ヒドロキシフェニル)フルオレン(東京化成工業(株)製)11.44g、PGME60.73gを入れた。その後、窒素下で還流するまで加熱、5gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)0.47gを滴下、約4時間後にメタノールと水で沈殿させて、乾燥させることでポリマー(1-8)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約4,100であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
100mLフラスコにTMOM-BP(本州化学(株)製)12.00g、2,2’-ビフェノール(東京化成工業(株)製)7.29g、PGME54.58gを入れた。その後、窒素下で還流するまで加熱、5gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)0.56gを滴下、約1.5時間後にメタノールと水で沈殿させて、乾燥させることでポリマー(1-9)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約3,700であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
100mLフラスコにTMOM-BP(本州化学(株)製)12.00g、1,5-ジヒドロキシナフタレン(東京化成工業(株)製)6.27g、PGME70.36gを入れた。その後、窒素下で還流するまで加熱、5gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)0.56gを滴下、約1時間後にメタノールと水で沈殿させて、乾燥させることでポリマー(1-10)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約10,000であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
フラスコにTMOM-BP(本州化学(株)製)68.99g、トリメシン酸(東京化成工業(株)製)40.00g、PGME379.42gを入れた。その後、窒素下で約90℃まで加熱、34.49gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)4.57gを滴下、約26.5時間後にメタノールと水とアンモニア水で沈殿させて、乾燥させることでポリマー(1-11)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約4,200であった。また、PGMEの導入を1H-NMRにより確認した。得られた樹脂をPGMEに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
100mLフラスコにカルバゾール(東京化成工業(株)製)8.00g、9-フルオレノン(東京化成工業(株)製)8.63g、メタンスルホン酸(東京化成工業(株)製)2.30g、PGMEA18.93gを入れた。その後、窒素下で還流するまで加熱、約1.5時間後にメタノールで沈殿させて、乾燥させることでポリマー(1-12)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約2,600であった。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
100mLフラスコにTMOM-BP(本州化学(株)製)15.00g、1,4-ジオキサン35.55gを入れた。その後、窒素下で120℃まで加熱、5gの1,4-ジオキサンに溶解させたメタンスルホン酸(東京化成工業(株)製)0.24gを滴下、約6時間後にメタノールで沈殿させて、乾燥させることでポリマー(2-1)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約4,600であった。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
100mLフラスコにTMOM-BP(本州化学(株)製)10.00g、カルバゾール(東京化成工業(株)製)5.46g、1,4-ジオキサン18.70gを入れた。その後、窒素下で120℃まで加熱、5gの1,4-ジオキサンに溶解させたメタンスルホン酸(東京化成工業(株)製)0.16gを滴下、約1時間後にメタノールで沈殿させて、乾燥させることでポリマー(2-2)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約3,200であった。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
100mLフラスコにTMOM-BP(本州化学(株)製)10.00g、N-フェニル-1-ナフチルアミン(東京化成工業(株)製)7.16g、1,4-ジオキサン18.70gを入れた。その後、窒素下で120℃まで加熱、5gの1,4-ジオキサンに溶解させたメタンスルホン酸(東京化成工業(株)製)0.16gを滴下、約1時間後にメタノールと水で沈殿させて、乾燥させることでポリマー(2-3)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約2,800であった。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
フラスコにTMOM-BP(本州化学(株)製)12.00g、トリメシン酸(東京化成工業(株)製)8.23g、1,4-ジオキサン23.88gを入れた。その後、窒素下で約120℃まで加熱、5gのPGMEに溶解させたメタンスルホン酸(東京化成工業(株)製)0.38gを滴下、約5時間反応させた。
200mLフラスコにN-フェニル-1-ナフチルアミン(東京化成工業(株)製)69.92g、2-エチルヘキシルアルデヒド(東京化成工業(株)製)40.88g、メタンスルホン酸(東京化成工業(株)製)9.19g、プロピレングリコールモノメチルエーテルアセテート(以降PGMEAと記載)80.00gを入れた。その後、窒素下で還流するまで加熱、約24時間後にメタノールで沈殿させて、乾燥させることでポリマー(2-4)を得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは約1,700であった。得られた樹脂をPGMEAに溶解させ、陽イオン交換樹脂と陰イオン交換樹脂を用いてイオン交換を4時間実施することで、目的のポリマー溶液を得た。
合成例1で樹脂溶液(固形分は21.38質量%)を得た。この樹脂溶液9.12gにTMOM-BP(本州化学(株)製)0.39g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.92g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.20g、PGMEA4.96g、PGME2.41gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例3で樹脂溶液(固形分は26.93質量%)を得た。この樹脂溶液6.03gにTMOM-BP(本州化学(株)製)0.33g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.43g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.16g、PGMEA5.24g、PGME5.80gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例4で樹脂溶液(固形分は22.01質量%)を得た。この樹脂溶液7.38gにTMOM-BP(本州化学(株)製)0.33g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.43g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.16g、PGMEA5.24g、PGME4.46gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例5で樹脂溶液(固形分は20.12質量%)を得た。この樹脂溶液8.08gにTMOM-BP(本州化学(株)製)0.33g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.43g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.16g、PGMEA5.24g、PGME3.76gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例6で樹脂溶液(固形分は17.85質量%)を得た。この樹脂溶液10.92gにTMOM-BP(本州化学(株)製)0.39g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.92g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.20g、PGMEA3.15g、PGME2.41gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例7で樹脂溶液(固形分は16.62質量%)を得た。この樹脂溶液11.73gにTMOM-BP(本州化学(株)製)0.39g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.92g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.20g、PGMEA2.35g、PGME2.41gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例8で樹脂溶液(固形分は18.61質量%)を得た。この樹脂溶液10.48gにTMOM-BP(本州化学(株)製)0.39g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.92g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.20g、PGMEA3.61g、PGME2.41gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例9で樹脂溶液(固形分は16.88質量%)を得た。この樹脂溶液11.55gにTMOM-BP(本州化学(株)製)0.39g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.92g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.20g、PGMEA2.52g、PGME2.41gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例10で樹脂溶液(固形分は18.06質量%)を得た。この樹脂溶液10.80gにTMOM-BP(本州化学(株)製)0.39g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.92g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.20g、PGMEA3.28g、PGME2.41gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例11で樹脂溶液(固形分は17.62質量%)を得た。この樹脂溶液13.82gにTMOM-BP(本州化学(株)製)0.49g、5質量%ピリジニウムp-ヒドロキシベンゼンスルホナート含有PGME1.44g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.49g、PGMEA6.12g、PGME2.64gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例1で樹脂溶液(固形分は21.38質量%)を得た。この樹脂溶液11.80gにTMOM-BP(本州化学(株)製)0.39g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME3.78g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.25g、PGMEA2.66g、PGME1.51gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例1で樹脂溶液(固形分は21.38質量%)を得た。この樹脂溶液12.15gに1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.26g、PGMEA2.37g、PGME5.22gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例1で樹脂溶液(固形分は21.38質量%)を得た。この樹脂溶液14.02gに1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.30g、PGMEA0.58g、PGME5.10gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例12で樹脂溶液(固形分は30.00質量%)を得た。この樹脂溶液4.33gに合成例1で得たポリマー溶液(固形分は21.38質量%)1.22g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME1.95g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.13g、PGMEA10.63g、PGME1.77gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
比較合成例5で樹脂溶液(固形分は24.24質量%)を得た。この樹脂溶液7.54gにTMOM-BP(本州化学(株)製)0.37g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME2.73g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.18g、PGMEA3.03g、PGME1.14gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例12で樹脂溶液(固形分は30.00質量%)を得た。この樹脂溶液4.33gにTMOM-BP(本州化学(株)製)0.26g、2質量%K-PURE TAG2689(キングインダストリーズ社製)含有PGME1.95g、1質量%界面活性剤(DIC(株)製、メガファックR-40)含有PGMEA0.13g、PGMEA11.56g、PGME1.77gを加えて溶解させ、孔径0.1μmのポリテトラフルオロエチレン製マイクロフィルターにて濾過して、レジスト下層膜形成組成物の溶液を調製した。
合成例2、6、7、11及び比較合成例1、2、3、4に従い合成を実施した際に、モノマー及びポリマーが反応溶媒に溶解するかを目視で確認した。懸濁していない溶液を良好、懸濁している溶液を不良とした。また、合成例2、6、7、11で得られたポリマーと比較合成例1、2、3で得られたポリマーについて、固形分が20質量%となるようにPGMEまたはPGMEAへ溶解させた。その後、合成例及び比較例に従ってイオン交換処理を実施し、ポリマーの溶解性を判断した。イオン交換処理後に懸濁していない溶液を良好、イオン交換処理後に懸濁している溶液を不良と判断した。結果を表1に示す。
続いて、これらのアルコール構造置換体を持つポリマー及び架橋剤の特性評価を行った。
比較例1-2及び実施例1-14で調製したレジスト下層膜形成組成物の溶液を、それぞれスピンコーターを用いてシリコンウエハー上に塗布し、ホットプレート上で240℃60秒間または350℃60秒間焼成し、レジスト下層膜(膜厚200nm)を形成した。これらレジスト下層膜を汎用的なシンナーであるPGME/PGMEA=7/3で浸漬して、硬化性を確認した。いずれのレジスト下層膜もこのシンナーに不溶であり、十分な硬化性を有することを確認した。
比較例1及び実施例1-13で調製したレジスト下層膜形成組成物の溶液を、それぞれスピンコーターを用いてシリコンウエハー上に塗布した。ホットプレート上で240℃60秒間または350℃60秒間焼成し、レジスト下層膜(膜厚50nm)を形成した。これらのレジスト下層膜について、分光エリプソメーターを用いて波長193nmでの屈折率(n値)及び光学吸光係数(k値、減衰係数とも呼ぶ)を測定した。結果を表2に示す。
ドライエッチング速度の測定に用いたエッチャー及びエッチングガスは以下の通り。
RIE-10NR(サムコ製):CF4
昇華物量の測定は国際公開第2007/111147号パンフレットに記載されている昇華物量測定装置を用いて実施した。比較例1及び実施例1-13で調製したレジスト下層膜形成組成物をそれぞれシリコンウエハーに塗布し、240℃60秒間あるいは350℃60秒間焼成後に膜厚200nmになる際の昇華物量を測定した。結果を表4に示す。なお、表に記載の値は(実施例1-13の昇華物量)/(比較例1の昇華物量)である。
200nm膜厚のSiO2基板、トレンチ幅50nm、ピッチ100nmのデンスパターンエリアにて埋め込み性を確認した。比較例1及び実施例1-13で調製されたレジスト下層膜形成組成物を上記基板上に塗布後、240℃60秒間または350℃60秒間焼成して約200nmのレジスト下層膜を形成した。この基板の平坦化性を日立ハイテクノロジーズ(株)製走査型電子顕微鏡(S-4800)を用いて観察し、パターン内部へのレジスト下層膜形成組成物の充填の有無を確認した。結果を表5に示す。
比較例1及び実施例1-13で調製されたレジスト下層膜形成組成物をそれぞれシリコンウエハーに塗布後、240℃60秒間または350℃60秒間焼成して200nmのレジスト下層膜を形成した。このレジスト硬化膜の硬度をBruker社製TI-980 triboidentorで評価した。比較例1に対して硬度が高いものを○と評価した。結果を表6に示す。
比較例1及び実施例1-13で調製された各レジスト下層膜形成組成物の溶液を、スピンコーターを用いてそれぞれ酸化ケイ素被膜付きシリコンウエハー上に塗布した。ホットプレート上で240℃60秒間または350℃60秒間焼成しレジスト下層膜(膜厚200nm)を形成した。レジスト下層膜上にシリコンハードマスク形成組成物溶液を塗布し、240℃で1分間焼成しシリコンハードマスク層(膜厚30nm)を形成した。その上にレジスト溶液を塗布し、100℃で1分間焼成しレジスト層(膜厚150nm)を形成した。マスクを用いて波長193nmで露光し、露光後加熱PEB(105℃で1分間)を行った後、現像してレジストパターンを得た。その後、フッ素系ガスと酸素系ガスを用いてドライエッチングを行い、レジストパターンを酸化ケイ素被膜付きシリコンウエハーに転写した後、それぞれのパターン形状を株式会社日立ハイテクノロジー製CG-4100で観察した。
(レジスト下層膜の昇華物量測定)
昇華物量の測定は国際公開第2007/111147号パンフレットに記載されている昇華物量測定装置を用いて実施した。比較例2及び実施例14で調製したレジスト下層膜形成組成物をそれぞれシリコンウエハーに塗布し、240℃60秒間焼成後に膜厚200nmになる際の昇華物量を測定した。結果を表7に示す。なお、表に記載の値は(実施例14の昇華物量)/(比較例2の昇華物量)である。
段差基板への被覆試験として、200nm膜厚のSiO2基板で、パターンが形成されていないオープンエリア(OPEN)とトレンチ幅50nm、ピッチ100nmのデンスパターンエリア(DENSE)にて被覆膜厚の比較を行った。比較例2及び実施例14で調製されたレジスト下層膜形成組成物を上記基板に塗布後、240℃で60秒間焼成して約200nmのレジスト下層膜を形成した。この基板の平坦化性を日立ハイテクノロジーズ(株)製走査型電子顕微鏡(S-4800)を用いて観察し、段差基板のトレンチエリア(パターン部)とオープンエリア(パターンなし部)との膜厚差(トレンチエリアとオープンエリアとの塗布段差でありバイアスと呼ぶ)を測定することで平坦化性を評価した。ここで、平坦化性とは、パターンが存在する部分(トレンチエリア(パターン部))と、パターンが存在しない部分(オープンエリア(パターンなし部))とで、その上部に存在する塗布された被覆物の膜厚差(Iso-denseバイアス)が小さいことを意味する。結果を表8に示す。
Claims (13)
- メトキシメチル基とメトキシメチル基以外のROCH2-基(Rは一価の有機基、水素原子又はこれらの混合である)とを有する同一又は異なる複数の構造単位、及び前記複数の構造単位を連結する連結基を含むポリマー(X)、並びに溶剤を含むレジスト下層膜形成組成物。
- Rが、フェニル基、ナフチル基若しくはアントラセニル基で置換されていてもよく、酸素原子若しくはカルボニル基で中断されていてもよい、飽和若しくは不飽和の直鎖若しくは分岐のC2-C20脂肪族炭化水素基、C3-C20脂環式炭化水素基、水素原子又はこれらの混合である、請求項1に記載のレジスト下層膜形成組成物。
- 連結基が、アルキレン基、エーテル基、又はカルボニル基を含む、請求項1又は2に記載のレジスト下層膜形成組成物。
- 構造単位が、フェノール性水酸基を有してもよく、置換若しくは無置換アミノ基を有してもよい芳香族環、複素環、又は縮合環を含む、請求項1乃至3のいずれか一項に記載のレジスト下層膜形成組成物。
- ポリマー(X)と架橋反応可能な膜材料(Y)を更に含む、請求項1乃至4のいずれか一項に記載のレジスト下層膜形成組成物。
- 架橋剤を更に含む、請求項1乃至5のいずれか一項に記載のレジスト下層膜形成組成物。
- 酸及び/又は酸発生剤を更に含む、請求項1乃至6のいずれか一項に記載のレジスト下層膜形成組成物。
- 界面活性剤を更に含む、請求項1乃至7のいずれか一項に記載のレジスト下層膜形成組成物。
- 前記溶剤が160℃以上の沸点を有する溶媒を含む請求項1乃至8のいずれか一項に記載のレジスト下層膜形成組成物。
- 請求項1乃至9のいずれか一項に記載の組成物からなる塗布膜の焼成物であることを特徴とするレジスト下層膜。
- 半導体基板上に請求項1乃至9のいずれか一項に記載の組成物を用いてレジスト下層膜を形成する工程、
形成されたレジスト下層膜の上にレジスト膜を形成する工程、
形成されたレジスト膜に対する光又は電子線の照射と現像によりレジストパターンを形成する工程、
形成されたレジストパターンを介して前記レジスト下層膜をエッチングし、パターン化する工程、及び
パターン化されたレジスト下層膜を介して半導体基板を加工する工程
を含む半導体装置の製造方法。 - 半導体基板上に請求項1乃至9のいずれか一項に記載の組成物を用いてレジスト下層膜を形成する工程、
形成されたレジスト下層膜の上にハードマスクを形成する工程、
形成されたハードマスクの上にレジスト膜を形成する工程、
形成されたレジスト膜に対する光又は電子線の照射と現像によりレジストパターンを形成する工程、
形成されたレジストパターンを介して前記ハードマスクをエッチングし、パターン化する工程、及び
パターン化されたハードマスクを介して前記レジスト下層膜をエッチングし、パターン化する工程、及び
パターン化されたレジスト下層膜を介して半導体基板を加工する工程
を含む半導体装置の製造方法。 - レジスト下層膜を形成する工程をナノインプリント法によって行う請求項11又は12に記載の半導体装置の製造方法。
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WO2024075733A1 (ja) * | 2022-10-06 | 2024-04-11 | 日産化学株式会社 | レジスト下層膜形成組成物 |
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JP2015134926A (ja) * | 2009-05-20 | 2015-07-27 | ローム アンド ハース エレクトロニック マテリアルズ エルエルシーRohm and Haas Electronic Materials LLC | 上塗りフォトレジストと共に使用するためのコーティング組成物 |
JP2019124943A (ja) * | 2015-10-31 | 2019-07-25 | ローム・アンド・ハース・エレクトロニック・マテリアルズ・コリア・リミテッド | オーバーコートされたフォトレジストと共に使用するためのコーティング組成物 |
JP2021015205A (ja) * | 2019-07-12 | 2021-02-12 | 日産化学株式会社 | 高分子架橋剤を用いたレジスト下層膜形成組成物 |
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JP2015134926A (ja) * | 2009-05-20 | 2015-07-27 | ローム アンド ハース エレクトロニック マテリアルズ エルエルシーRohm and Haas Electronic Materials LLC | 上塗りフォトレジストと共に使用するためのコーティング組成物 |
JP2019124943A (ja) * | 2015-10-31 | 2019-07-25 | ローム・アンド・ハース・エレクトロニック・マテリアルズ・コリア・リミテッド | オーバーコートされたフォトレジストと共に使用するためのコーティング組成物 |
JP2021015205A (ja) * | 2019-07-12 | 2021-02-12 | 日産化学株式会社 | 高分子架橋剤を用いたレジスト下層膜形成組成物 |
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