WO2021251295A1 - 上層膜形成組成物及び相分離パターン製造方法 - Google Patents
上層膜形成組成物及び相分離パターン製造方法 Download PDFInfo
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- WO2021251295A1 WO2021251295A1 PCT/JP2021/021393 JP2021021393W WO2021251295A1 WO 2021251295 A1 WO2021251295 A1 WO 2021251295A1 JP 2021021393 W JP2021021393 W JP 2021021393W WO 2021251295 A1 WO2021251295 A1 WO 2021251295A1
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3081—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3086—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H—ELECTRICITY
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
- H01L21/31133—Etching organic layers by chemical means
- H01L21/31138—Etching organic layers by chemical means by dry-etching
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by heteroatoms or groups containing heteroatoms
Definitions
- the present invention relates to an upper layer film forming composition and a method for producing a phase separation pattern.
- an upper layer that can cause a vertical arrangement of block copolymers without dissolving or swelling the layer containing the block copolymer formed on the substrate and provides an upper film showing good solubility in a hydrophobic solvent. The development of film-forming compositions is awaited.
- the present invention includes the following.
- A) (a) A copolymer containing a unit structure derived from a maleimide structure and a unit structure derived from a styrene structure, and
- B) An upper film forming composition containing a non-aromatic hydrocarbon compound that is liquid at normal temperature and pressure as a solvent.
- the unit structure derived from the maleimide structure is the formula (1) :.
- R 1 is a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 10 carbon atoms which may be substituted with a halogen atom. show)
- the unit structure derived from the above styrene structure is the formula (2) :.
- R 2 to R 4 , R 7 and R 8 may be independently substituted with a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a halogen atom, respectively.
- the (A) copolymer further comprises a unit structure derived from the (b) (meth) acrylic group.
- the unit structure derived from the (meth) acrylic group is the formula (3) :.
- R 5 and R 6 are independently substituted with a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a linear chain having 1 to 10 carbon atoms which may be substituted with a halogen atom. Represents a branched or cyclic alkyl group.
- R 1 is a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 10 carbon atoms which may be substituted with a halogen atom. show
- the compound represented by and the formula (5) The compound represented by and the formula (5) :.
- R 2 to R 4 , R 7 and R 8 may be independently substituted with a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a halogen atom, respectively.
- [12] (1) Step of forming a block copolymer layer on a substrate, (2) A step of forming an upper layer film on the block copolymer layer using the composition according to any one of [1] to [11], and (3) a block formed on the substrate.
- a method for forming a phase separation pattern of block copolymers including. [13] (1) Step of forming a block copolymer layer on a substrate, (2) A step of forming an upper layer film on the block copolymer layer using the composition according to any one of [1] to [11]. (3) a step of phase-separating the block copolymer layer formed on the substrate, and (4) a step of etching the phase-separated block copolymer layer.
- a pattern manufacturing method including. [14] (1) Step of forming a block copolymer layer on a substrate, (2) A step of forming an upper layer film on the block copolymer layer using the composition according to any one of [1] to [11].
- a method for manufacturing a semiconductor device including.
- the upper layer film produced by using the upper layer film forming composition of the present invention shows good solubility in a hydrophobic solvent that does not dissolve the block copolymer, and can cause a vertical arrangement of the block copolymer.
- the upper layer film forming composition according to the present invention is an upper layer film forming composition used for phase-separating a layer containing a block copolymer formed on a substrate.
- A (a) A copolymer containing a unit structure derived from a maleimide structure and a unit structure derived from a styrene structure, and
- B An upper film forming composition containing a non-aromatic hydrocarbon compound that is liquid at normal temperature and pressure as a solvent.
- This composition can be used as an upper film forming composition which forms a film on a block copolymer thin film, controls the orientation of the block copolymer by heating, and then removes the film. Even for a block copolymer layer that cannot be oriented only by heating, it can be oriented by using the upper film formed by the present composition.
- maleimide structure and the “styrene structure” refer to chemical structures having maleimide and styrene as skeletons, respectively.
- derived unit structure refers to a repeating unit forming the main chain of a copolymer derived from the compound having a maleimide structure or a styrene structure while maintaining its skeleton.
- the unit structure derived from the maleimide structure is the formula (1) :.
- R 1 is a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 10 carbon atoms which may be substituted with a halogen atom. Represented by).
- the unit structure derived from the styrene structure is the formula (2) :.
- R 2 to R 4 , R 7 and R 8 may be independently substituted with a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a halogen atom, respectively. Represents a linear, branched or cyclic alkyl group of ⁇ 10).
- R 7 and R 8 are preferably hydrogen atoms.
- the molar ratio of the unit structures represented by the formulas (1) and (2) to the entire copolymer (A) is the molar ratio to the entire copolymer (A).
- Structural unit of formula (1) 30 to 70 mol%
- Structural unit of formula (2) 20 to 50 mol% Is desirable.
- the copolymer (A) can contain a unit structure derived from the (b) (meth) acrylic group in addition to the formulas (1) and (2).
- the (meth) acrylic group means both an acrylic group and a methacrylic group.
- the (meth) acrylate compound means both an acrylate compound and a methacrylate compound.
- (meth) acrylic acid means acrylic acid and methacrylic acid.
- the unit structure derived from the (meth) acrylic group is the formula (3) :.
- R 5 and R 6 are independently substituted with a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a linear chain having 1 to 10 carbon atoms which may be substituted with a halogen atom. It represents a branched or cyclic alkyl group.).
- the molar ratio of the unit structure of the formula (3) to the whole polymer (A) is 0.1 to 50 mol%, more preferably 0.1 to 30 mol%, still more preferable to the whole copolymer (A). Is 0.1 to 20 mol%, most preferably 0.1 to 10 mol%.
- examples of the linear, branched or cyclic alkyl group having 1 to 15 carbon atoms include a methyl group, an ethyl group, an n-propyl group and an i-propyl group.
- examples of the aryl group having 6 to 10 carbon atoms include a phenyl group, a benzyl group, a naphthyl group and the like.
- examples of the alkoxy group having 1 to 5 carbon atoms include a methoxy group, an ethoxy group, an n-propoxy group, an i-propoxy group, a cyclopropoxy group and n-.
- halogen atom examples include F, Cl, Br, and I.
- the distribution of the unit structure represented by the formulas (1), (2) and (3) in the copolymer (A) is not particularly limited. That is, in the copolymer (A), the unit structures represented by the formulas (1) and (2) may be alternately copolymerized or randomly copolymerized. When the unit structures represented by the formula (3) coexist, the unit structures represented by the formulas (1), (2), and (3) in the copolymer (A) each constitute a block. It may be combined randomly.
- the number of repetitions of the unit structure represented by the formulas (1), (2) and (3) in the copolymer (A) is within the range of mol% of each unit structure described above, and the copolymer weight.
- the weight average molecular weight Mw of the coalescence (A) can be appropriately selected within the range of usually 5,000 to 500,000, preferably 5,000 to 100,000, more preferably 5,000 to 50,000. ..
- the method for producing the copolymer (A) used in the present invention is the formula (4) :.
- R 1 is a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 10 carbon atoms which may be substituted with a halogen atom.
- the compound represented by) and the formula (5) may be independently substituted with a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a halogen atom, respectively.
- Represents a linear, branched or cyclic alkyl group of ⁇ 10) Includes a step of copolymerizing a monomer mixture containing a compound represented by.
- R 7 and R 8 are preferably hydrogen atoms.
- formula (6) (In the formula (6), R 5 and R 6 are independently substituted with a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a linear chain having 1 to 10 carbon atoms which may be substituted with a halogen atom. Represents a branched or cyclic alkyl group.)
- the compound represented by can be blended.
- the above monomer mixture is The compounds represented by the formulas (4) and (5) are applied to the entire copolymer (A).
- the copolymer (A) can be obtained by a known polymerization method.
- Known polymerization methods include radical polymerization, anionic polymerization, cationic polymerization and the like.
- Various known techniques such as solution polymerization, suspension polymerization, emulsion polymerization, and bulk polymerization can be used.
- the polymerization initiator used at the time of polymerization is 2,2'-azobis (isobutyronitrile), 2,2'-azobis (2-methylbutyronitrile), 2,2'-azobis (2,4-azobis). Didimethylvaleronitrile), 4,4'-azobis (4-cyanovaleric acid), 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (4-methoxy-2,4- Dimethylvaleronitrile), 2,2'-azobis (isobutyronitrile), 1,1'-azobis (cyclohexane-1-carbonitrile), 1-[(1-cyano-1-methylethyl) azo] formamide, 2,2'-Azobisisobuty [2- (2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis [2- (2-imidazolin-2-yl) propane], 2,2'- Azobis (2-methylpropionamidine) dihydrochloride
- the solvents used during polymerization include dioxane, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol, propylene glycol monomethyl ether, and propylene glycol monomethyl ether.
- Methyl acid, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, ethyl 3-ethoxypropionate, methyl 3-ethoxypropionate, methyl pyruvate, ethyl pyruvate, ethyl acetate, butyl acetate, ethyl lactate, butyl lactate Etc. can be used. These may be used alone or in combination.
- the copolymer (A) used in the present invention can be obtained by carrying out a stirring reaction at 50 ° C. to 200 ° C. for 1 hour to 48 hours under the reaction conditions.
- the solution containing the copolymer (A) thus obtained can be used as it is for the preparation of the upper film forming composition. Further, the copolymer (A) can be recovered and used by precipitating and isolating it in a poor solvent such as methanol, ethanol, isopropanol and water, or a mixed solvent thereof.
- a poor solvent such as methanol, ethanol, isopropanol and water, or a mixed solvent thereof.
- the copolymer (A) After the copolymer (A) is isolated, it may be used as it is by being redissolved in a liquid non-aromatic hydrocarbon compound at normal temperature and pressure as described below, or it may be used after being dried. ..
- the drying conditions for drying are preferably 6 to 48 hours at 30 to 100 ° C. in an oven or the like.
- the copolymer (A) After the copolymer (A) is recovered, it can be redissolved in a liquid non-aromatic hydrocarbon compound at the following normal temperature and pressure to prepare the composition of the present invention and used as the upper layer film forming composition.
- the weight average molecular weight of the copolymer (A) used in the present invention measured by the gel permeation chromatography (GPC) method varies depending on the coating solvent used, solution viscosity, etc., but is usually 5 in terms of polystyrene. It is 5,000 to 500,000, preferably 5,000 to 100,000, more preferably 5,000 to 50,000.
- the solvent used in the composition of the present invention is a non-aromatic hydrocarbon compound that is liquid at normal temperature and pressure. More specifically, the non-aromatic hydrocarbon compound (hereinafter, may be referred to as "non-aromatic hydrocarbon solvent") that is liquid at normal temperature and pressure used as a solvent in the composition of the present application is as follows. That's right.
- the non-aromatic hydrocarbon compound that is liquid at normal temperature and pressure is a non-aromatic hydrocarbon compound having 4 to 26 carbon atoms.
- the non-aromatic hydrocarbon compound which is liquid at normal temperature and pressure is an acyclic hydrocarbon compound or a cyclic hydrocarbon compound.
- the acyclic hydrocarbon compound is a saturated linear hydrocarbon compound (SLC), an unsaturated linear hydrocarbon compound (ULC), a saturated branched chain hydrocarbon compound (SBC), or an unsaturated branched chain hydrocarbon compound (Saturated branched chain hydrocarbon compound).
- the cyclic hydrocarbon compound is a monocyclic compound (S1R) having a substituent, a bicyclic compound (S2R) having a substituent, a fused ring compound (SFR) having a substituent, or a bicyclic compound having no substituent. (U2R), or a fused ring compound (UFR) without substituents.
- the substituent is not particularly limited, but is preferably a linear, branched or cyclic alkyl, alkenyl or alkynyl group having 1 to 12 carbon atoms, or a halogen atom.
- linear, branched or cyclic alkyl, alkenyl or alkynyl groups having 1 to 12 carbon atoms include methyl group, ethyl group, n-propyl group, i-propyl group, cyclopropyl group, n-butyl group and i.
- halogen atom examples include F, Cl, Br, and I.
- the cyclic hydrocarbon compound is a cyclic hydrocarbon compound having 6 to 19 carbon atoms.
- the number of carbon atoms in this case also includes the number of carbon atoms of the substituent.
- saturated linear hydrocarbon compound examples include alkanes having 4 to 14 carbon atoms represented by n-octane, n-nonane, n-decane and the like.
- unsaturated linear hydrocarbon compound examples include the following compounds having 4 to 14 carbon atoms.
- saturated branched chain hydrocarbon compound examples include the following compounds having 5 to 26 carbon atoms.
- saturated linear hydrocarbon compound examples include the following compounds having 6 to 16 carbon atoms.
- UBC unsaturated branched chain hydrocarbon compound
- monocyclic compound (S1R) having a substituent include the following compounds having 6 to 19 carbon atoms.
- bicyclic compound (U2R) having no substituent include the following compounds.
- fused ring compound (UFR) having no substituent include the following compounds.
- preferred solvents are saturated linear hydrocarbon compounds having 8 to 10 carbon atoms, which have an excellent balance between the solubility of the copolymer (A) and the insolubility of the block copolymer of the present application, and 7 to 7 carbon atoms.
- examples thereof include monocyclic compounds having 10 substituents, and particularly preferable solvents are saturated linear hydrocarbon compounds having 8 carbon atoms, saturated linear hydrocarbon compounds having 10 carbon atoms, and cyclohexane having substituents (10). For example, 1-methyl-4-isopropylcyclohexane).
- These solvents can be used alone or as a mixture.
- the following organic solvent may be mixed with the non-aromatic hydrocarbon solvent.
- the solvent is, for example, the one mentioned in the above-mentioned section of the method for producing the copolymer (A).
- the solvent other than the non-aromatic hydrocarbon solvent may be present in a ratio of 0.01 to 13% by mass with respect to the non-aromatic hydrocarbon solvent.
- the upper film forming composition according to the present invention can further contain additives such as a surfactant and a rheology adjuster.
- rheology adjusters can be added to the upper film forming composition of the present invention, if necessary.
- the rheology adjuster is added mainly for the purpose of improving the fluidity of the composition of the present invention.
- 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.
- Examples include maleic acid derivatives such as normal butylmalate, diethylmalate, and dinonylmalate, oleic acid derivatives such as methyl olate, butyl olate, and tetrahydrofurfuryl oleate, and stearic acid derivatives such as normal butyl stearate and glyceryl stearate.
- maleic acid derivatives such as normal butylmalate, diethylmalate, and dinonylmalate
- oleic acid derivatives such as methyl olate, butyl olate, and tetrahydrofurfuryl oleate
- stearic acid derivatives such as normal butyl stearate and glyceryl stearate.
- the upper film forming composition of the present invention does not generate pinholes or striations, and a surfactant can be added in order to further improve the coatability against surface unevenness.
- a surfactant include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, and polyoxyethylene oleyl ether, polyoxyethylene octylphenol ether, and polyoxyethylene nonyl.
- Polyoxyethylene alkylaryl ethers such as surfactants, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristeer
- Polyoxys such as sorbitan fatty acid esters such as rates, polyoxyethylene sorbitan monolaurates, polyoxyethylene sorbitan monopalmitates, polyoxyethylene sorbitan monostearates, polyoxyethylene sorbitan trioleates, and polyoxyethylene sorbitan tristearates.
- Nonionic surfactants such as ethylene sorbitan fatty acid esters, EF301, EF303, EF352 (manufactured by Tochem Products Co., Ltd.), Megafatu F171, F173 (manufactured by Dainippon Ink Co., Ltd.), Florard FC430, FC431 (Sumitomo 3M) Fluorosurfactant such as Asahi Guard AG710, Surflon S-382, SC101, SC102, SC103, SC104, SC105, SC106 (manufactured by Asahi Glass Co., Ltd.), Futergent series (manufactured by Neos Co., Ltd.), etc.
- ethylene sorbitan fatty acid esters EF301, EF303, EF352 (manufactured by Tochem Products Co., Ltd.), Megafatu F171, F173 (manufactured by Dainippon Ink Co., Ltd.), Florard FC430, FC431 (Sum
- organosiloxane polymer KP341 manufactured by Shin-Etsu Chemical Industry Co., Ltd.
- the blending amount of these surfactants is usually 0.2% by mass or less, preferably 0.1% by mass or less, per 100% by mass of the entire upper film forming composition of the present invention.
- These surfactants may be added alone or in combination of two or more.
- the content of the copolymer (A) in the solid content of the composition is preferably 20% by mass or more, for example, 20 to 100% by mass, or 30 to 100% by mass.
- the solid content of the composition of the present invention is preferably 0.1 to 50% by mass, more preferably 0.3 to 30% by mass.
- the solid content is a composition obtained by removing the solvent component from the upper film forming composition.
- the copolymer (A), a non-aromatic hydrocarbon compound that is liquid at room temperature and normal pressure as a solvent, and, if necessary, the additive are mixed according to the composition, for example, by stirring and mixing at room temperature to 40 ° C. ,
- the upper layer film forming composition of the present invention can be produced.
- the upper film forming composition according to the present invention is used for phase separation of a layer containing a block copolymer formed on a substrate.
- the method for forming a phase separation pattern of a block copolymer according to the present invention is (1) Step of forming a block copolymer layer on a substrate, (2) a step of forming an upper layer film on the block copolymer layer using the above upper layer film forming composition, and (3) a step of phase-separating the block copolymer layer formed on the substrate. including.
- a block copolymer is a bond of a plurality of types of polymers (blocks) that are chemically different and covalently bonded to each other.
- block copolymers Many applications have been proposed for block copolymers based on their ability to form nanometer-scale patterns.
- the self-assembling pattern of block copolymers can be used as a nanolithograph mask or as a template for further synthesis of inorganic or organic structures. This can be achieved by taking advantage of the different etching rates between the blocks.
- the block copolymer used in the present invention contains an organic polymer chain (A) containing an organic monomer (a) as a unit structure and a monomer (b) different from the organic monomer (a) as a unit structure, and the organic polymer chain (A). ) Includes a polymer chain (B).
- the self-assembled film-forming composition can have a solid content of 0.1 to 10% by mass, 0.1 to 5% by mass, or 0.1 to 3% by mass.
- the solid content is the remaining ratio of the film-forming composition excluding the solvent.
- the proportion of block copolymer in the solid content can be 30 to 100% by mass, 50 to 100% by mass, 50 to 90% by mass, or 50 to 80% by mass.
- the types of blocks present in the block copolymer can be 2 or 3 or more. Then, the number of blocks existing in the block copolymer can be 2 or 3 or more.
- polymer chain (B) By changing the polymer chain (B), it is possible to use, for example, an adjacent polymer chain (C) containing the monomer (c) as a unit structure.
- block polymer there are combinations of AB, ABAB, ABA, ABC and the like.
- the polymerization process consists only of an initiation reaction and a growth reaction and is not accompanied by a side reaction that inactivates the growth end.
- the growth end can continue to maintain the growth activity reaction during the polymerization reaction.
- a polymer (A) having a uniform length can be obtained.
- polymerization can proceed under the monomer (b) to form a block copolymer (AB).
- the polymer chains (A) and the polymer chains (B) have a molar ratio of 1: 9 to 9: 1, preferably 3: 7 to 7: 3. be able to.
- the volume ratio of the block copolymer of the present application is, for example, 30:70 to 70:30.
- Homopolymer A or B is a polymerizable compound having at least one reactive group (vinyl group or vinyl group-containing organic group) capable of radical polymerization.
- the weight average molecular weight Mw of the block copolymer used in the present invention is 1,000 to 100,000, preferably 5,000 to 100,000, more preferably 5,000 to 50,000, 5,000 to 30,000. Most preferably. If it is less than 1,000, the coatability to the base substrate may be poor, and if it is 100,000 or more, the solubility in the solvent may be poor.
- the polydispersity (Mw / Mn) of the block copolymer of the present application is preferably 1.00 to 1.50, and particularly preferably 1.00 to 1.20.
- block copolymers include a combination of an aromatic polymer chain and an acrylic resin polymer chain. More specifically, a combination of a poly (vinylpyridine) derivative polymer and a polyacrylic acid ester derivative polymer such as poly (4-vinylpyridine) and polymethylmethacrylate, or a polyacrylic acid derivative polymer and a polystyrene derivative polymer. Or a combination of a poly (hydroxystyrene) derivative polymer and a polyacrylic acid ester derivative polymer.
- silicon-containing polymer chains and non-silicon-containing polymers such as polysilanes such as polydihexylsilane, polysiloxanes such as polydimethylsiloxane, and silylated polystyrene derivatives such as poly (trimethylsilylstyrene) and poly (pentamethyldisilylstyrene). Even when combined with a chain, for example, the difference in dry etching rate can be increased, which is preferable.
- the silylated polystyrene derivative is preferably poly (4-trimethylsilylstyrene) or poly (4-pentamethyldisilylstyrene) having a substituent at the 4-position.
- a combination of a silylated polystyrene derivative and a polystyrene derivative polymer, a combination of two different polystyrene derivative polymers, or a combination of a silylated polystyrene derivative polymer and polylactide is preferable.
- a combination of a silylated polystyrene derivative having a substituent at the 4-position and a polystyrene derivative polymer having a substituent at the 4-position a combination of two different types of polystyrene derivative polymers having a substituent at the 4-position, or a substitution.
- a combination of a silylated polystyrene derivative polymer having a group at the 4-position and polylactide is preferable.
- More preferred embodiments of the block copolymer include a combination of poly (trimethylsilylstyrene) and polymethoxystyrene, a combination of polystyrene and poly (tert-butylstyrene), a combination of polystyrene and poly (trimethylsilylstyrene), and poly (trimethylsilyl).
- a combination of styrene) and poly (D, L-lactide) can be mentioned.
- More preferred embodiments of the block copolymer include a combination of poly (4-trimethylsilylstyrene) and poly (4-methoxystyrene), a combination of polystyrene and poly (4-tert-butylstyrene), and polystyrene and poly (4-tert-butylstyrene).
- Examples include a combination with trimethylsilylstyrene) and a combination of poly (4-trimethylsilylstyrene) and poly (D, L-lactide).
- the base material is a group consisting of silicon, silicon oxide, glass, surface-modified glass, plastic, ceramic, transparent base material, flexible base material, and a base material (or a combination thereof) used in roll-to-roll processing. Is selected from. A silicon wafer, quartz, glass, or plastic is preferable, and a silicon wafer is more preferable.
- the base material may be provided with an underlayer film for surface energy neutralization, if necessary.
- the underlayer film is applied onto the base material by a conventional means such as spin coating so as to have a predetermined film thickness, and then heated, immersed, or the like, if necessary.
- the block copolymer is applied onto the base material or the underlayer film by a conventional means such as spin coating so as to have a predetermined film thickness.
- the upper layer film forming composition is as described above.
- the upper layer film forming composition thus prepared is applied onto the block copolymer layer by a conventional means such as spin coating to form an upper layer film.
- the film thickness of the upper layer film is not particularly limited, but is generally 3 nm to 100 nm, preferably 10 to 70 nm, and particularly preferably 20 to 60 nm. If it is 3 nm or less, the phase separation pattern of the desired uniform block copolymer cannot be formed. If it is 100 nm or more, it takes too much time during the etching process, which is not preferable.
- the upper film forming composition according to the present invention is extremely advantageous because it is dissolved in a solvent or a solvent mixture that does not damage, dissolve, or substantially swell the block copolymer.
- phase separation of the block copolymer layer is a treatment that causes rearrangement of the block copolymer material in the presence of the upper layer film, for example, ultrasonic treatment or solvent treatment. , Thermal annealing or the like. In many applications, it is desirable to achieve phase separation of the block copolymer layer by simply heating or so-called thermal annealing. Thermal annealing can be performed in the atmosphere or in an inert gas under normal pressure, reduced pressure or pressurized conditions.
- Phase separation of the block copolymer layer forms a block copolymer domain oriented substantially perpendicular to the substrate or underlying membrane surface.
- the form of the domain is, for example, lamellar, spherical, columnar, or the like.
- the domain spacing is, for example, 50 nm or less, 40 nm or less, 30 nm or less, or 20 nm or less. According to the method of the present invention, it is possible to form a structure having a desired size, shape, orientation and periodicity.
- the upper layer film can be peeled off after performing phase separation of the block copolymer layer.
- the peeling can be carried out, for example, by using a solvent or a mixture of solvents (solvent for peeling) that does not damage, dissolve, or substantially swell the block copolymer.
- the exfoliated upper membrane composition can also be isolated and reused. Isolation can be performed by conventional means such as precipitation, distillation and the like.
- the pattern manufacturing method is (1) Step of forming a block copolymer layer on a substrate, (2) A step of forming an upper layer film on the block copolymer layer by using the above upper layer film forming composition. (3) a step of phase-separating the block copolymer layer formed on the substrate, and (4) a step of etching the phase-separated block copolymer layer. including.
- the block copolymer layer phase-separated by the above method can be further subjected to a step of etching it. Usually, a part of the phase-separated block copolymer is removed before etching. Etching can be performed by known means. This method can be used for the manufacture of semiconductor substrates.
- the method for manufacturing a semiconductor device is as follows. (1) Step of forming a block copolymer layer on a substrate, (2) A step of forming an upper layer film on the block copolymer layer by using the above upper layer film forming composition. (3) A step of phase-separating the block copolymer layer formed on the substrate. (4) A step of etching the phase-separated block copolymer layer, and (5) a step of etching the substrate. including.
- etching for example, tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), perfluoro propane (C 3 F 8 ), trifluoromethane (CHF 3 ), difluoromethane (CH 2 F 2 ), 1 Gases such as carbon oxide, argon, oxygen, nitrogen, sulfur hexafluoride, difluoromethane, nitrogen trifluoride and chlorine trifluoride, chlorine, trichloroborane and dichloroborane, or a combination of the above gases can be used.
- a desired shape is given to the substrate to be processed by etching, and a suitable semiconductor device is manufactured. It is possible to do.
- the self-assembled monolayer composition composed of block copolymer 1 or 2 was applied by a spin coater and heated on a hot plate at 100 ° C. for 1 minute to obtain a self-assembled monolayer having a film thickness of 40 nm.
- the obtained coating film was immersed in n-octane for 1 minute, spin-dried, and then heated at 100 ° C. for 30 seconds to measure the film thickness to confirm the amount of change in the film thickness.
- Example 2 to 3 The solvent resistance of the block copolymer layer was confirmed by the same method as in Example 1 except that n-decane and p-menthane were used instead of n-octane.
- Table 1 shows the results of solvent resistance confirmed in Examples 1 to 3 and Comparative Examples 1 to 5.
- the weight average molecular weight (Mw) of the polymer (A) shown in the synthesis example below is a measurement result by a gel permeation chromatography (GPC) method.
- GPC gel permeation chromatography
- Measuring device HLC-8020GPC [Product name] (manufactured by Tosoh Corporation)
- GPC column TSKgel G2000HXL; 2 pcs, G3000HXL: 1 pcs, G4000HXL; 1 pcs [Product name] (All manufactured by Tosoh Corporation)
- Solvent Tetrahydrofuran (THF)
- Flow rate 1.0 ml / min
- Standard sample Polystyrene (manufactured by Tosoh Corporation)
- Example 4 (Preparation of Upper Membrane Composition 1) 0.25 g of the resin obtained in Synthesis Example 1 was dissolved in 9.75 g of p-menthane, which was a good result in Examples 1 to 3, to obtain a 2.5% by mass solution. Then, it was filtered using a polyethylene microfilter having a pore size of 0.2 ⁇ m to prepare a solution of the upper layer film forming composition 1 of the self-assembled monolayer.
- Underlayer Film Forming Composition 1 Polyethylene having a pore size of 0.02 ⁇ m is prepared by dissolving 0.1 g of poly (styrene-co-4-tert-butylstyrene) having a hydroxyl group terminal in 19.9 g of propylene glycol monomethyl ether acetate to make a 0.5 mass% solution. Filtration was performed using a microfilter manufactured by Mfg. Co., Ltd. to prepare a solution of an underlayer film-forming composition of a self-assembled film composed of a block copolymer.
- the underlayer film forming composition 1 of the self-assembled monolayer obtained above is applied onto a silicon wafer, heated on a hot plate at 240 ° C. for 1 minute, and then immersed in propylene glycol monomethyl ether acetate for 1 minute to lower the underlayer film. (A layer) was obtained.
- a self-assembled monolayer composition 2 composed of block copolymer 2 is applied thereto by a spin coater and heated on a hot plate at 100 ° C. for 1 minute to form a self-assembled monolayer (B layer) having a film thickness of 40 nm. did.
- the upper film forming composition 1 was applied thereto with a spinner, and then heated on a hot plate at 200 ° C. for 10 minutes to induce a microphase-separated structure of the block copolymer.
- FIG. 1 shows the arrangement of each layer.
- the silicon wafer in which the microphase separation structure was induced was etched using an etching device (Lam 2300 Versys Kiyo45) manufactured by Lam Research Co., Ltd. using O 2 gas as the etching gas for 25 seconds to remove the upper layer film.
- the polymethoxystyrene region was preferentially etched, and then the shape was observed with an electron microscope (S-4800) (FIG. 2).
- Examples 5 to 8 The sample was prepared and the microphase-separated structure of the block copolymer was formed by the same method as in Example 4 except that the polymers 2 to 5 were used instead of the polymer 1.
- the top coat prepared by using the upper film forming composition of the present invention can be applied without dissolving the block copolymer, and can cause a vertical arrangement of the block copolymer. Will be.
- An upper layer film formation that can cause a vertical arrangement of block copolymers without dissolving or swelling the layer containing the block copolymer formed on the substrate and provides an upper layer film showing good solubility in hydrophobic solvents.
- the compositions are extremely useful industrially.
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Abstract
Description
[1] 基板上に形成したブロックコポリマーを含む層を相分離させるために用いられる上層膜形成組成物であって、
(A)(a)マレイミド構造に由来する単位構造及びスチレン構造に由来する単位構造を含む共重合体と、
(B)溶剤として、常温常圧において液体の非芳香族炭化水素化合物
とを含む、上層膜形成組成物。
[2] 前記溶剤が炭素原子数4乃至26の非芳香族炭化水素化合物である[1]に記載の上層膜形成組成物。
[3] 前記溶剤が非環状炭化水素化合物、又は環状炭化水素化合物である[1]又は[2]に記載の上層膜形成組成物。
[4] 前記非環状炭化水素化合物が飽和直鎖、不飽和直鎖、飽和分岐鎖、又は不飽和分岐鎖炭化水素化合物である[3]に記載の上層膜形成組成物。
[5] 前記環状炭化水素化合物が置換基を有する単環化合物、又は置換基を有してもよい二環もしくは縮合環化合物である[3]に記載の上層膜形成組成物。
[6] 前記環状炭化水素化合物が炭素原子数6乃至19の環状炭化水素化合物である[3]に記載の上層膜形成組成物。
[7] 前記マレイミド構造に由来する単位構造が、式(1):
(式(1)中、R1は、水素原子、炭素原子数1~10の直鎖、分岐若しくは環状アルキル基、又はハロゲン原子で置換されていてもよい炭素原子数6~10のアリール基を表す)
で表される、[1]乃至[6]のいずれか一項に記載の組成物。
[8] 上記スチレン構造に由来する単位構造が、式(2):
(式(2)中、R2~R4, R7及びR8はそれぞれ独立に、水素原子、炭素原子数1~5のアルコキシ基、又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐若しくは環状アルキル基を表す。)
で表される、[1]乃至[7]のいずれか一項に記載の組成物。
[9] 前記(A)共重合体が、さらに
(b)(メタ)アクリル基に由来する単位構造を含む、
[1]乃至[8]のいずれか一項に記載の組成物。
[10] 前記(メタ)アクリル基に由来する単位構造が、式(3):
(式(3)中、R5及びR6はそれぞれ独立に、水素原子、炭素原子数1~5のアルコキシ基、又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐若しくは環状アルキル基を表す。)
で表される、[9]に記載の組成物。
[11] 式(4):
(式(4)中、R1は、水素原子、炭素原子数1~10の直鎖、分岐若しくは環状アルキル基、又はハロゲン原子で置換されていてもよい炭素原子数6~10のアリール基を表す)
で表される化合物と、式(5):
(式(5)中、R2~R4、R7及びR8はそれぞれ独立に、水素原子、炭素原子数1~5のアルコキシ基、又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐若しくは環状アルキル基を表す。)
で表される化合物を含むモノマー混合物を共重合させることにより得られる共重合体(A)を含む、[1]乃至[10]のいずれか一項に記載の組成物。
[12] (1)ブロックコポリマー層を基板上に形成する工程、
(2)前記ブロックコポリマー層の上に、[1]乃至[11]のいずれか一項に記載の組成物を用いて上層膜を形成する工程、及び
(3)前記基板上に形成されたブロックコポリマー層を相分離させる工程、
を含む、ブロックコポリマーの相分離パターン形成方法。
[13] (1)ブロックコポリマー層を基板上に形成する工程、
(2)前記ブロックコポリマー層の上に、[1]乃至[11]のいずれか一項に記載の組成物を用いて上層膜を形成する工程、
(3)前記基板上に形成されたブロックコポリマー層を相分離させる工程、及び
(4)前記相分離したブロックコポリマー層をエッチングする工程、
を含む、パターン製造方法。
[14] (1)ブロックコポリマー層を基板上に形成する工程、
(2)前記ブロックコポリマー層の上に、[1]乃至[11]のいずれか一項に記載の組成物を用いて上層膜を形成する工程、
(3)前記基板上に形成されたブロックコポリマー層を相分離させる工程、及び
(4)前記相分離したブロックコポリマー層をエッチングする工程、
(5)前記基板をエッチングする工程、
を含む、半導体装置の製造方法。
本発明に係る上層膜形成組成物は、基板上に形成したブロックコポリマーを含む層を相分離させるために用いられる上層膜形成組成物であって、
(A)(a)マレイミド構造に由来する単位構造及びスチレン構造に由来する単位構造を含む共重合体と、
(B)溶剤として、常温常圧において液体の非芳香族炭化水素化合物
とを含む、上層膜形成組成物である。
本組成物は、ブロックコポリマー薄膜上に製膜し、加熱により上記ブロックコポリマーの配向を制御した後、除去する上層膜形成組成物として使用することができる。加熱するだけでは配向することができないブロックコポリマー層に対しても、本組成物により形成される上層膜を用いれば配向が可能となる。
[(a)マレイミド構造に由来する単位構造及びスチレン構造に由来する単位構造を含む共重合体]
(式(1)中、R1は、水素原子、炭素原子数1~10の直鎖、分岐若しくは環状アルキル基、又はハロゲン原子で置換されていてもよい炭素原子数6~10のアリール基を表す)で表される。
(式(2)中、R2~R4、R7及びR8はそれぞれ独立に、水素原子、炭素原子数1~5のアルコキシ基、又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐若しくは環状アルキル基を表す。)で表される。R7及びR8は好ましくは水素原子である。
式(1)の構造単位:30乃至70モル%
式(2)の構造単位:20乃至50モル%
であることが望ましい。
さらに前記共重合体(A)は、式(1)及び式(2)に加え、(b)(メタ)アクリル基に由来する単位構造を含むことができる。
本発明において、(メタ)アクリル基とは、アクリル基とメタクリル基の両方を意味する。(メタ)アクリレート化合物とは、アクリレート化合物とメタクリレート化合物の両方を意味する。例えば(メタ)アクリル酸は、アクリル酸とメタクリル酸を意味する。
(式(3)中、R5及びR6はそれぞれ独立に、水素原子、炭素原子数1~5のアルコキシ基、又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐若しくは環状アルキル基を表す。)で表される。
本発明で用いる共重合体(A)の製造方法は、式(4):
(式(4)中、R1は、水素原子、炭素原子数1~10の直鎖、分岐若しくは環状アルキル基、又はハロゲン原子で置換されていてもよい炭素原子数6~10のアリール基を表す)で表される化合物と、式(5):
(式(5)中、R2~R4、R7及びR8はそれぞれ独立に、水素原子、炭素原子数1~5のアルコキシ基、又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐若しくは環状アルキル基を表す。)
で表される化合物を含むモノマー混合物を共重合させる工程を含む。R7及びR8は好ましくは水素原子である。
(式(6)中、R5及びR6はそれぞれ独立に、水素原子、炭素原子数1~5のアルコキシ基、又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐若しくは環状アルキル基を表す。)
で表される化合物を配合することができる。
式(4)及び式(5)で表される化合物を、共重合体(A)全体に対し、
式(4)で表される化合物:30乃至70モル%
式(5)で表される化合物:20乃至50モル%
の割合で含むことが好ましい。
式(4)で表される化合物:30乃至70モル%
式(5)で表される化合物:20乃至50モル%
式(6)で表される化合物:0.1乃至40モル%
の割合で含むことが好ましい。
本発明の組成物に使用される溶剤は、常温常圧において液体の非芳香族炭化水素化合物である。より具体的には、本願の組成物に溶剤として使用される常温常圧において液体の非芳香族炭化水素化合物(以下において、「非芳香族炭化水素系溶剤」と称する場合がある)は以下のとおりである。
好ましくは、常温常圧において液体の非芳香族炭化水素化合物は、炭素原子数4乃至26の非芳香族炭化水素化合物である。
好ましくは、常温常圧において液体の非芳香族炭化水素化合物は、非環状炭化水素化合物、又は環状炭化水素化合物である。
好ましくは、非環状炭化水素化合物は、飽和直鎖炭化水素化合物(SLC)、不飽和直鎖炭化水素化合物(ULC)、飽和分岐鎖炭化水素化合物(SBC)、又は不飽和分岐鎖炭化水素化合物(UBC)である。
好ましくは、環状炭化水素化合物は、置換基を有する単環化合物(S1R)、置換基を有する二環化合物(S2R)、置換基を有する縮合環化合物(SFR)、置換基を有しない二環化合物(U2R)、又は置換基を有しない縮合環化合物(UFR)である。
これらの溶剤は単独で、又は混合物として用いることができる。
本発明に係る上層膜形成組成物は、更に界面活性剤、レオロジー調整剤などの添加剤を含むことができる。
本発明に係る上層膜形成組成物は、基板上に形成したブロックコポリマーを含む層を相分離させるために用いられる。
(1)ブロックコポリマー層を基板上に形成する工程、
(2)前記ブロックコポリマー層の上に、上記上層膜形成組成物を用いて上層膜を形成する工程、及び
(3)前記基板上に形成されたブロックコポリマー層を相分離させる工程、
を含む。
ブロックコポリマーは、化学的に異なりそして互いに共有結合している複数種類のポリマー(ブロック)が結合したものである。ブロックコポリマーに関しては、ナノメートルスケールパターンを形成する性能に基づいて多くの用途が提案されている。例えばブロックコポリマーの自己組織化パターンは、ナノリソグラフマスクや無機または有機構造のさらなる合成のための鋳型としての利用することができる。これは、それぞれのブロックの間でエッチング速度が異なることを利用することにより実現できる。
特に、上記シリル化ポリスチレン誘導体は、置換基を4位に有するポリ(4-トリメチルシリルスチレン)、ポリ(4-ペンタメチルジシリルスチレン)が好ましい。
これらの中でも、シリル化ポリスチレン誘導体とポリスチレン誘導体ポリマーとの組み合わせ、異なる2種のポリスチレン誘導体ポリマーの組み合わせ又はシリル化ポリスチレン誘導体ポリマーとポリラクチドの組み合わせが好ましい。
これらの中でも、置換基を4位に有するシリル化ポリスチレン誘導体と置換基を4位に有するポリスチレン誘導体ポリマーとの組み合わせ、異なる2種の、置換基を4位に有するポリスチレン誘導体ポリマーの組み合わせ、又は置換基を4位に有するシリル化ポリスチレン誘導体ポリマーとポリラクチドの組み合わせが好ましい。
上層膜形成組成物については上記したとおりである。かくして準備された上層膜形成組成物は、ブロックコポリマー層の上にスピンコーティング等の慣用の手段により適用され、上層膜が形成される。上層膜の形成膜厚は特に限定されないが、一般的には3nm乃至100nmであり、好ましくは10~70nmであり、特に好ましくは20~60nmである。3nm以下であると、所望の均一なブロックコポリマーの相分離パターンが形成できない。100nm以上であると、エッチング加工時に時間がかかりすぎるため、好ましくない。本発明に係る上層膜形成組成物は、ブロックコポリマーを傷つけず、溶かさず、実質的に膨潤もさせない溶媒または溶媒混合物に溶解されているので、極めて有利である。
ブロックコポリマー層の相分離は、上層膜の存在下に、ブロックコポリマー材料の再配列をもたらす処理、例えば、超音波処理、溶媒処理、熱アニール等によって行うことができる。多くの用途において、単純に加熱またはいわゆる熱アニールによりブロックコポリマー層の相分離を達成することが望ましい。熱アニールは、大気中又は不活性ガス中において、常圧、減圧又は加圧条件下で行うことができる。
(1)ブロックコポリマー層を基板上に形成する工程、
(2)前記ブロックコポリマー層の上に、上記上層膜形成組成物を用いて上層膜を形成する工程、
(3)前記基板上に形成されたブロックコポリマー層を相分離させる工程、及び
(4)前記相分離したブロックコポリマー層をエッチングする工程、
を含む。
(1)ブロックコポリマー層を基板上に形成する工程、
(2)前記ブロックコポリマー層の上に、上記上層膜形成組成物を用いて上層膜を形成する工程、
(3)前記基板上に形成されたブロックコポリマー層を相分離させる工程、
(4)前記相分離したブロックコポリマー層をエッチングする工程、及び
(5)前記基板をエッチングする工程、
を含む。
(ブロックコポリマー1からなる自己組織化膜形成組成物1の調製)
プロピレングリコールモノメチルエーテルアセテート24.5gにブロックコポリマーであるポリ(4-メトキシスチレン)/ポリ(4-トリメチルシリルスチレン)コポリマー(重量平均分子量Mw=30200、多分散度=1.12、体積比率50:50)0.5gを溶解させ、2質量%溶液とした後、孔径0.02μmのポリエチレン製ミクロフィルターを用いて濾過し、ブロックコポリマー1からなる自己組織化膜形成組成物1の溶液を調製した。
プロピレングリコールモノメチルエーテルアセテート24.5gにブロックコポリマーであるポリ(4-メトキシスチレン)/ポリ(4-トリメチルシリルスチレン)コポリマー(重量平均分子量Mw=17600、多分散度=1.11、体積比率50:50)0.5gを溶解させ、2質量%溶液とした後、孔径0.02μmのポリエチレン製ミクロフィルターを用いて濾過し、ブロックコポリマー2からなる自己組織化膜形成組成物2の溶液を調製した。
ブロックコポリマー1又は2からなる自己組織化膜形成組成物をスピンコーターにより塗布し、ホットプレート上で100℃にて1分間加熱し、膜厚40nmの自己組織化膜を得た。得られた塗布膜をn-オクタンに1分間浸漬し、スピンドライしたのち、100℃にて30秒加熱した膜の膜厚を測定して膜厚の変化量を確認した。
n-オクタンの代わりにn-デカン、p-メンタンを用いた以外は、実施例1と同様の方法により、ブロックコポリマー層の溶剤耐性を確認した。
n-オクタンの代わりにジイソアミルエーテル、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノメチルエーテル、酢酸ブチル、2-ヘプタノンを用いた以外は、実施例1と同様の方法により、ブロックコポリマー層の溶剤耐性を確認した。
上記実施例1~3および比較例1~5にて確認した溶剤耐性の結果を表1に示す。
測定装置:HLC-8020GPC〔商品名〕(東ソー株式会社製)
GPCカラム:TSKgel G2000HXL;2本、 G3000HXL:1本、G4000HXL;1本〔商品名〕(全て東ソー株式会社製)
カラム温度:40℃
溶媒:テトラヒドロフラン(THF)
流量:1.0ml/分
標準試料:ポリスチレン(東ソー株式会社製)
N-シクロヘキシルマレイミド3.20g、4-tert-ブチルスチレン2.00g、tert-ブチルメタクリレート0.76g、2,2’-アゾビスイソブチロニトリル0.18gをプロピレングリコールモノメチルエーテルアセテート24.0gに溶解させた後、この溶液を加熱し、140℃で約2時間撹拌した。この反応液をメタノールに滴下し、析出物を吸引ろ過にて回収した後、60℃で減圧乾燥してポリマー1を回収した。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、13,100であった。
N-シクロヘキシルマレイミド3.14g、4-tert-ブチルスチレン2.24g、イソプロピルメタクリレート0.45g、2,2’-アゾビスイソブチロニトリル0.18gをプロピレングリコールモノメチルエーテルアセテート24.0gに溶解させた後、この溶液を加熱し、140℃で約2時間撹拌した。この反応液をメタノールに滴下し、析出物を吸引ろ過にて回収した後、60℃で減圧乾燥してポリマー2を回収した。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、12,800であった。
N-シクロヘキシルマレイミド3.06g、4-tert-ブチルスチレン2.19g、シクロヘキシルメタクリレート0.58g、2,2’-アゾビスイソブチロニトリル0.18gをプロピレングリコールモノメチルエーテルアセテート24.0gに溶解させた後、この溶液を加熱し、140℃で約2時間撹拌した。この反応液をメタノールに滴下し、析出物を吸引ろ過にて回収した後、60℃で減圧乾燥してポリマー3を回収した。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、11,700であった。
N-シクロヘキシルマレイミド2.80g、4-tert-ブチルスチレン1.50g、イソプロピルアダマンチルメタクリレート1.64g、2,2’-アゾビスイソブチロニトリル0.06gをプロピレングリコールモノメチルエーテルアセテート24.0gに溶解させた後、この溶液を加熱し、140℃で約2時間撹拌した。この反応液をメタノールに滴下し、析出物を吸引ろ過にて回収した後、60℃で減圧乾燥してポリマー4を回収した。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、34,600であった。
N-シクロヘキシルマレイミド2.78g、4-tert-ブチルスチレン1.24g、エチルアダマンチルメタクリレート1.93g、2,2’-アゾビスイソブチロニトリル0.05gをプロピレングリコールモノメチルエーテルアセテート24.0gに溶解させた後、この溶液を加熱し、140℃で約2時間撹拌した。この反応液をメタノールに滴下し、析出物を吸引ろ過にて回収した後、60℃で減圧乾燥してポリマー5を回収した。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、21,100であった。
(上層膜組成物1の調製)
合成例1で得た樹脂0.25gを実施例1~3にて良好な結果であったp-メンタン9.75gに溶解させ、2.5質量%の溶液とした。その後、孔径0.2μmのポリエチレン製ミクロフィルターを用いてろ過し、自己組織化膜の上層膜形成組成物1の溶液を調製した。
プロピレングリコールモノメチルエーテルアセテート19.9gにヒドロキシル基末端を持つポリ(スチレン-co-4-tert-ブチルスチレン)0.1gを溶解させ、0.5質量%溶液とした後、孔径0.02μmのポリエチレン製ミクロフィルターを用いて濾過し、ブロックコポリマーからなる自己組織化膜の下層膜形成組成物の溶液を調製した。
上記で得られた自己組織化膜の下層膜形成組成物1をシリコンウェハー上に塗布し、ホットプレート上で240℃、1分間加熱した後、プロピレングリコールモノメチルエーテルアセテートに1分間浸漬させ、下層膜(A層)を得た。その上にブロックコポリマー2からなる自己組織化膜形成組成物2をスピンコーターにより塗布し、ホットプレート上で100℃にて1分間加熱し、膜厚40nmの自己組織化膜(B層)を形成した。その上に上層膜形成組成物1をスピナーにより塗布し、続いてホットプレート上で200℃にて10分間加熱し、ブロックコポリマーのミクロ相分離構造を誘起させた。図1に各層の配置を示す。
ミクロ相分離構造を誘起させたシリコンウェハーはラム・リサーチ社製エッチング装置(Lam 2300 Versys Kiyo45)を用い、エッチングガスとしてO2ガスを使用して25秒間エッチングすることで、上層膜を除去するとともにポリメトキシスチレン領域を優先的にエッチングし、続いて電子顕微鏡(S-4800)で形状を観察した(図2)。
ポリマー1の代わりにポリマー2~5を用いた以外は、実施例4と同様の方法により、試料の調製およびブロックコポリマーのミクロ相分離構造の形成を実施した。
上層膜形成組成物の溶剤であるp-メンタンの代わりに比較例1~5にて不良な結果であったジイソアミルエーテル、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノメチルエーテル、酢酸ブチル、2-ヘプタノンを用いた以外は、実施例4と同様の方法により、試料の調製およびブロックコポリマーのミクロ相分離構造の形成を実施した。
上記実施例4~8および比較例6~10にて調製した上層膜の溶解性およびブロックコポリマーの配列性について確認した。結果を表2及び図2に示す。
Claims (14)
- 基板上に形成したブロックコポリマーを含む層を相分離させるために用いられる上層膜形成組成物であって、
(A)(a)マレイミド構造に由来する単位構造及びスチレン構造に由来する単位構造を含む共重合体と、
(B)溶剤として、常温常圧において液体の非芳香族炭化水素化合物
とを含む、上層膜形成組成物。 - 前記溶剤が炭素原子数4乃至26の非芳香族炭化水素化合物である請求項1に記載の上層膜形成組成物。
- 前記溶剤が非環状炭化水素化合物、又は環状炭化水素化合物である請求項1又は2に記載の上層膜形成組成物。
- 前記非環状炭化水素化合物が飽和直鎖、不飽和直鎖、飽和分岐鎖、又は不飽和分岐鎖炭化水素化合物である請求項3に記載の上層膜形成組成物。
- 前記環状炭化水素化合物が置換基を有する単環化合物、又は置換基を有してもよい二環もしくは縮合環化合物である請求項3に記載の上層膜形成組成物。
- 前記環状炭化水素化合物が炭素原子数6乃至19の環状炭化水素化合物である請求項3に記載の上層膜形成組成物。
- 前記(A)共重合体が、さらに
(b)(メタ)アクリル基に由来する単位構造を含む、
請求項1乃至8のいずれか一項に記載の組成物。 - (1)ブロックコポリマー層を基板上に形成する工程、
(2)前記ブロックコポリマー層の上に、請求項1乃至11のいずれか一項に記載の組成物を用いて上層膜を形成する工程、及び
(3)前記基板上に形成されたブロックコポリマー層を相分離させる工程、
を含む、ブロックコポリマーの相分離パターン形成方法。 - (1)ブロックコポリマー層を基板上に形成する工程、
(2)前記ブロックコポリマー層の上に、請求項1乃至11のいずれか一項に記載の組成物を用いて上層膜を形成する工程、
(3)前記基板上に形成されたブロックコポリマー層を相分離させる工程、及び
(4)前記相分離したブロックコポリマー層をエッチングする工程、
を含む、パターン製造方法。 - (1)ブロックコポリマー層を基板上に形成する工程、
(2)前記ブロックコポリマー層の上に、請求項1乃至11のいずれか一項に記載の組成物を用いて上層膜を形成する工程、
(3)前記基板上に形成されたブロックコポリマー層を相分離させる工程、及び
(4)前記相分離したブロックコポリマー層をエッチングする工程、
(5)前記基板をエッチングする工程、
を含む、半導体装置の製造方法。
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JPH0687932A (ja) * | 1992-09-04 | 1994-03-29 | Nippon Shokubai Co Ltd | マレイミド系共重合体の製造方法 |
JPH07278232A (ja) * | 1994-04-12 | 1995-10-24 | Japan Synthetic Rubber Co Ltd | 熱可塑性樹脂組成物 |
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JPH0337257A (ja) * | 1989-07-04 | 1991-02-18 | Nippon Oil & Fats Co Ltd | 低収縮性不飽和ポリエステル樹脂組成物 |
JPH0687932A (ja) * | 1992-09-04 | 1994-03-29 | Nippon Shokubai Co Ltd | マレイミド系共重合体の製造方法 |
JPH07278232A (ja) * | 1994-04-12 | 1995-10-24 | Japan Synthetic Rubber Co Ltd | 熱可塑性樹脂組成物 |
WO2017188031A1 (ja) * | 2016-04-28 | 2017-11-02 | 株式会社日本触媒 | マレイミド系ブロック共重合体の製造方法 |
WO2020017494A1 (ja) * | 2018-07-17 | 2020-01-23 | 日産化学株式会社 | 微細相分離パターン形成のためのブロックコポリマー層形成組成物 |
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