WO2017170696A1 - グリコールウリル骨格を持つ化合物を添加剤として含むレジスト下層膜形成組成物 - Google Patents
グリコールウリル骨格を持つ化合物を添加剤として含むレジスト下層膜形成組成物 Download PDFInfo
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- WO2017170696A1 WO2017170696A1 PCT/JP2017/012902 JP2017012902W WO2017170696A1 WO 2017170696 A1 WO2017170696 A1 WO 2017170696A1 JP 2017012902 W JP2017012902 W JP 2017012902W WO 2017170696 A1 WO2017170696 A1 WO 2017170696A1
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- underlayer film
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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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3442—Heterocyclic compounds having nitrogen in the ring having two nitrogen atoms in the ring
- C08K5/3445—Five-membered rings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P76/00—Manufacture or treatment of masks on semiconductor bodies, e.g. by lithography or photolithography
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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
- G03F7/40—Treatment after imagewise removal, e.g. baking
Definitions
- the present invention relates to a resist underlayer film forming composition containing a compound having a glycoluril skeleton as an additive, and more specifically, in the lithography process of manufacturing a semiconductor device, the function of preventing the pattern collapse of a resist pattern formed on a substrate is added.
- the present invention relates to a resist underlayer film forming composition enhanced by an agent, that is, having improved adhesion to a resist pattern, and a resist underlayer film and a semiconductor device manufacturing method using the composition.
- Antiresistive film-forming composition containing a compound containing an alkoxymethyl group having a glycoluril skeleton such as 1,3,4,6-tetrakis (2-hydroxymethyl) glycoluril as an antireflective film as a resist underlayer film has been reported (Patent Document 1).
- the resist underlayer film formed from the composition is used with respect to the obtained resist pattern by using the lactone structure as a constituent of the resist underlayer film forming composition. It has been reported that adhesion improves. That is, by using a structure including a polar site such as a lactone structure as a constituent component of the resist underlayer film forming composition, adhesion to the resist pattern is improved, and the resist pattern is prevented from collapsing even in a fine resist pattern. (Patent Document 2).
- a method for controlling the chemical state of the interface between the resist and the resist underlayer film can be mentioned. That is, in a positive resist, when the chemical state of the interface between the resist and the resist underlayer film is an acidic state, the resulting resist pattern shape is an undercut shape, and the contact area of the resist pattern is extremely reduced, thereby reducing the resist pattern. Prone to collapse.
- JP 2004-126161 A International Publication No. 2003/017002 International Publication No. 2013/168610
- lactone is used as a constituent of the resist underlayer film forming composition. Simply including the structure is not sufficient to prevent the resist pattern from collapsing.
- Patent Document 2 and Patent Document 3 have a problem that it is necessary to change the configuration of the polymer, and it takes time to create and evaluate the sample and leads to high costs. Therefore, there has been a demand for a simpler and more effective means to replace this.
- a compound having a glycoluril skeleton (this compound can be said to be a resist adhesion aid) is used. It aims at providing the resist underlayer film forming composition containing.
- R 1 to R 4 are each composed of a hydroxy group, a thiol group, a carboxyl group, a C1-5 alkoxyethyl group, a C1-5 alkylsulfanyl group, and an organic group containing an ester bond.
- R 5 and R 6 are each a hydrogen atom A group selected from a C1-10 alkyl group and a phenyl group).
- Additive for resist underlayer film forming composition is added to a hydroxy group, a thiol group, a carboxyl group, a C1-5 alkoxyethyl group, a C1-5 alkylsulfanyl group, and an organic group containing an ester bond.
- R 1 to R 4 are a C2-10 alkyl group in which a hydrogen atom is substituted with a hydroxy group or a thiol group, or a C2-10 alkenyl group.
- a resist underlayer film forming composition comprising the additive according to [1] or [2].
- the polymer (a) has the formula (2): (In the formula (2), A represents a direct bond or —C ( ⁇ O) —, and Ar represents a C1-6 alkyl group, a halogen atom, a hydroxy group, a carboxyl group, an amino group, a C1-6 alkoxy group, Substituted with C1-6 alkylthio group, cyano group, acetyl group, acetyloxy group, C1-6 alkoxycarbonyl group, nitro group, nitroso group, amide group, imide group, C1-6 alkoxysulfonyl group or sulfonamide group A benzene ring, a naphthalene ring, or an anthracene ring, which may be used).
- [6] The composition according to any one of [3] to [5], further comprising a crosslinking agent and a crosslinking catalyst.
- a resist pattern used in the manufacture of a semiconductor comprising a step of applying the resist underlayer film forming composition according to any one of [3] to [6] onto a semiconductor substrate and baking to form a resist underlayer film Forming method.
- a step of forming a lower layer film on the semiconductor substrate with the resist underlayer film forming composition according to any one of [3] to [6], a step of forming a resist film thereon, light or electron beam irradiation A method of manufacturing a semiconductor device, comprising: a step of forming a resist pattern by development, a step of etching the lower layer film by a resist pattern, and a step of processing a semiconductor substrate by a patterned lower layer film.
- [12] Use of the resist underlayer film forming composition according to any one of [3] to [6] for forming a resist underlayer film.
- [13] Use of the resist underlayer film forming composition according to any one of [3] to [6] for the manufacture of a semiconductor device.
- a method for producing a resist underlayer film comprising a step of applying and baking the resist underlayer film forming composition according to any one of [3] to [6] on a semiconductor substrate.
- the above problem can be solved by mixing a compound having a glycoluril skeleton that does not function (react) as a crosslinking agent or has low functionality into the resist underlayer film forming composition as an additive.
- it differs from 1,3,4,6-tetrakis (methoxymethyl) glycoluril that has been conventionally used as a cross-linking agent for resist underlayer films.
- the additive has a low function (reactivity) as a cross-linking agent, it is considered that the additive accumulates on the resist underlayer film surface. Therefore, a structure containing a polar site such as a glycoluril structure is gathered at the resist and resist underlayer film interface. It is considered that the physical properties of the resist underlayer film surface are changed, and the adhesion to the resist pattern is improved and the resist pattern shape is controlled.
- the resist underlayer film forming composition may be baked at an arbitrary temperature of 120 to 215 ° C.
- Additive for resist underlayer film forming composition includes the following (1-1): (In the formula (1-1), R 1 to R 4 are each composed of a hydroxy group, a thiol group, a carboxyl group, a C1-5 alkoxyethyl group, a C1-5 alkylsulfanyl group, and an organic group containing an ester bond. A C2-10 alkyl group in which a hydrogen atom is substituted by at least one group selected from the group, and these may be all the same or different, and R 5 and R 6 are each a hydrogen atom, C1-10 alkyl A group selected from a group or a phenyl group).
- C1-5 alkoxyethyl group examples include a methoxyethyl group, an ethoxyethyl group, an n-propoxyethyl group, an i-propoxyethyl group, an n-butyloxyethyl group, an i-butyloxyethyl group, and a sec-butyloxy group. Examples include, but are not limited to, an ethyl group.
- C1-5 alkylsulfanyl group examples include a methylethyl sulfide group, a diethylsulfide group, an n-propylethylsulfide group, an i-propoethylsulfide group, an n-butylethylsulfide group, and an i-butylethylsulfide group.
- Sec-butylethylsulfide group and the like are not limited thereto.
- C2-10 alkyl group examples include ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, s-butyl group, t-butyl group, n-pentyl group, 1 -Methyl-n-butyl group, 2-methyl-n-butyl group, 3-methyl-n-butyl group, 1,1-dimethyl-n-propyl group, 1,2-dimethyl-n-propyl group, 2, 2-dimethyl-n-propyl group, 1-ethyl-n-propyl group, n-hexyl group, 1-methyl-n-pentyl group, 2-methyl-n-pentyl group, 3-methyl-n-pentyl group, 4-methyl-n-pentyl group, 1,1-dimethyl-n-butyl group, 1,2-dimethyl-n-butyl group, 1,3-dimethyl-n-butyl group
- a cyclic alkyl group can also be used.
- a cyclic alkyl group having 3 to 10 carbon atoms a cyclopropyl group, a cyclobutyl group, a 1-methyl-cyclopropyl group, a 2-methyl-cyclopropyl group, a cyclopentyl group, 1-methyl-cyclobutyl group, 2-methyl-cyclobutyl group, 3-methyl-cyclobutyl group, 1,2-dimethyl-cyclopropyl group, 2,3-dimethyl-cyclopropyl group, 1-ethyl-cyclopropyl group, 2 -Ethyl-cyclopropyl group, cyclohexyl group, 1-methyl-cyclopentyl group, 2-methyl-cyclopentyl group, 3-methyl-cyclopentyl group, 1-ethyl-cyclobutyl group, 2-ethyl-cyclobutyl group, 3-ethyl-cyclobutyl Group, 1,2-d
- Examples of the organic group containing an ester bond include methyl ethyl ester group, diethyl ester group, n-propyl ethyl ester group, i-propo ethyl ester group, n-butyl ethyl ester group, i-butyl ethyl ester group, sec-butyl. Examples include, but are not limited to, ethyl ester groups.
- C1-10 alkyl group examples include the specific examples of the C2-10 alkyl group described above in addition to the methyl group.
- R 1 to R 4 a C2-10 alkyl group in which a hydrogen atom is substituted with a hydroxy group or a thiol group is preferable, and a C2-10 alkyl group in which a hydrogen atom is substituted with a hydroxy group is preferable. More preferred is a C2-5 alkyl group in which a hydrogen atom is substituted by a group.
- R 1 to R 4 may be the same or different, but are preferably the same.
- R 5 and R 6 each preferably represents a hydrogen atom or a group selected from C1-10 alkyl, more preferably a hydrogen atom or a group selected from C1-5 alkyl.
- R 5 and R 6 may be the same or different, but are preferably the same.
- the additive for a resist underlayer film forming composition according to the present invention includes the following (1-1): (In the formula (1-1), R 1 to R 4 are C2-10 alkenyl groups in which a hydrogen atom is not substituted, and these may all be the same or different, and R 5 and R 6 are each And a group selected from a hydrogen atom, a C1-10 alkyl group, and a phenyl group.
- C2-10 alkenyl group examples include ethenyl group (vinyl group), 1-propenyl group, 2-propenyl group, 1-methyl-1-ethenyl group, 1-butenyl group, 2-butenyl group, 3-butenyl group.
- R 1 to R 4 are each more preferably a C2 to 5 alkenyl group.
- R 1 to R 4 may be the same or different, but are preferably the same.
- R 5 and R 6 each preferably represents a hydrogen atom or a group selected from C1-10 alkyl, more preferably a hydrogen atom or a group selected from C1-5 alkyl.
- R 5 and R 6 may be the same or different, but are preferably the same.
- formula (1-1-1) Formula (1-1-1) (1,3,4,6-tetrakis (2-hydroxyethyl) glycoluril) Following formula (1-1-2): The following formula (1-1-2) (1,3,4,6-tetraallyltetrahydroimidazo [4,5-d] imidazole-2,5 (1H, 3H) -dione)
- formula (1-1-3) Formula (1-1-3) (1,3,4,6-tetraallyl-3a, 6a-dimethyltetrahydroimidazo [4,5-d] imidazole-2,5 (1H, 3H) -dione)
- formula (1-1-4) Formula (1-1-4) (1,3,4,6-tetrakis (2-mercaptoethyl) glycoluril)
- the compound of formula (1-1-1) or formula (1-1-2) is most preferred.
- a resist underlayer film forming composition containing the compound having a glycoluril skeleton according to the present invention as an additive will be described.
- This composition according to the present invention is performed using short-wavelength irradiation light, particularly irradiation light of KrF excimer laser (wavelength 248 nm), ArF excimer laser (wavelength 193 nm) or extreme ultraviolet light (EUV, wavelength 13.5 nm). It is a resist underlayer film forming composition that can be used in a lithography process for manufacturing semiconductor devices.
- the resist underlayer film forming composition of the present invention contains an additive for a resist underlayer film forming composition represented by the above formula (1-1). Usually, it further contains (a) a polymer and (b) a solvent. It contains a crosslinking agent, a crosslinking catalyst, a surfactant and the like as optional components.
- the solid content of the resist underlayer film forming composition of the present invention is, for example, 0.5 to 50% by mass, and for example, 1 to 30% by mass. Here, the solid content is obtained by removing the solvent component from all the components of the resist underlayer film forming composition.
- the amount of the additive for the resist underlayer film forming composition represented by the above formula (1-1) is 0.1% by mass or more per total solid content. For example, 0.5% to 50% by mass, 1% to 30% by mass, 2% to 30% by mass, 3% to 30% by mass, 2% to 20% % By mass, 3% by mass to 10% by mass, or 3% by mass to 5% by mass.
- the dry etching rate (thickness reduction per unit time), attenuation coefficient, refractive index, etc. of the resist underlayer film formed from the resist underlayer film forming composition of the present invention Can be adjusted.
- a polymer A various organic polymer can be used.
- addition polymerization polymers such as polyester, polystyrene, polyimide, acrylic polymer, methacrylic polymer, polyvinyl ether, phenol novolac, naphthol novolak, polyether, polyamide, polycarbonate, and the like, and condensation polymerization polymers and ring-opening polymerization polymers can be used.
- An organic polymer having an aromatic ring structure such as a benzene ring, a naphthalene ring, an anthracene ring, a triazine ring, a quinoline ring, and a quinoxaline ring that functions as a light absorption site is preferably used.
- organic polymers examples include addition polymerizable monomers such as benzyl acrylate, benzyl methacrylate, phenyl acrylate, naphthyl acrylate, anthryl methacrylate, anthryl methyl methacrylate, styrene, hydroxystyrene, benzyl vinyl ether, and N-phenylmaleimide.
- addition polymerization polymers contained as structural units and polycondensation polymers such as phenol novolac and naphthol novolak.
- the polymer When an addition polymerization polymer is used as the organic polymer, the polymer may be a homopolymer or a copolymer.
- An addition polymerizable monomer is used for the production of the addition polymerization polymer.
- examples of such addition polymerizable monomers include acrylic acid, methacrylic acid, acrylic ester compounds, methacrylic ester compounds, acrylamide compounds, methacrylamide compounds, vinyl compounds, styrene compounds, maleimide compounds, maleic anhydride, acrylonitrile and the like. It is done.
- acrylate compound examples include methyl acrylate, ethyl acrylate, normal hexyl acrylate, isopropyl acrylate, cyclohexyl acrylate, benzyl acrylate, phenyl acrylate, anthryl methyl acrylate, 2-hydroxyethyl acrylate, and 3-chloro-2-hydroxypropyl acrylate.
- methacrylic acid ester compounds examples include methyl methacrylate, ethyl methacrylate, normal hexyl methacrylate, isopropyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, phenyl methacrylate, anthryl methyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2,2 , 2-trifluoroethyl methacrylate, 2,2,2-trichloroethyl methacrylate, 2-bromoethyl methacrylate, 4-hydroxybutyl methacrylate, 2-methoxyethyl methacrylate, tetrahydrofurfuryl methacrylate, 2-methyl-2-adamantyl methacrylate, 5-Methacryloyloxy-6-hydroxynorbornene-2-cal Kishirikku 6- lactone, 3-methacryloxypropyl triethoxysilane, g
- acrylamide compound examples include acrylamide, N-methylacrylamide, N-ethylacrylamide, N-benzylacrylamide, N-phenylacrylamide, N, N-dimethylacrylamide, and N-anthrylacrylamide.
- methacrylamide compound examples include methacrylamide, N-methyl methacrylamide, N-ethyl methacrylamide, N-benzyl methacrylamide, N-phenyl methacrylamide, N, N-dimethyl methacrylamide and N-anthryl acrylamide. It is done.
- vinyl compound examples include vinyl alcohol, 2-hydroxyethyl vinyl ether, methyl vinyl ether, ethyl vinyl ether, benzyl vinyl ether, vinyl acetic acid, vinyl trimethoxysilane, 2-chloroethyl vinyl ether, 2-methoxyethyl vinyl ether, vinyl naphthalene and vinyl anthracene. Is mentioned.
- styrene compound examples include styrene, hydroxystyrene, chlorostyrene, bromostyrene, methoxystyrene, cyanostyrene, and acetylstyrene.
- maleimide compound examples include maleimide, N-methylmaleimide, N-phenylmaleimide, N-cyclohexylmaleimide, N-benzylmaleimide and N-hydroxyethylmaleimide.
- examples of such a polymer include a polycondensation polymer of a glycol compound and a dicarboxylic acid compound.
- glycol compound examples include diethylene glycol, hexamethylene glycol, butylene glycol and the like.
- dicarboxylic acid compound examples include succinic acid, 2,2-dimethylsuccinic acid, adipic acid, terephthalic acid, isophthalic acid, phthalic acid, 3,3′-dithiodipropionic acid, tartaric acid, malic acid, maleic anhydride, and the like.
- succinic acid 2,2-dimethylsuccinic acid
- adipic acid terephthalic acid
- isophthalic acid phthalic acid
- 3,3′-dithiodipropionic acid tartaric acid
- malic acid maleic anhydride
- Aliphatic dicarboxylic acids and aromatic dicarboxylic acids can be mentioned.
- polyesters such as polypyromellitimide, poly (p-phenylene terephthalamide), polybutylene terephthalate, polyethylene terephthalate, polyamide, and polyimide can be used.
- examples of such a polymer include a condensation polymerization polymer of a diepoxy compound and a dicarboxylic acid compound.
- diepoxy compound examples include sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, glycerol polyglycidyl ether, trimethylolpropane polyglycidyl ether, neopentyl glycol diglycidyl ether, 1 , 6-hexanediol diglycidyl ether, compounds represented by the following [3-1] to [3-16]: And the like.
- dicarboxylic acid compound examples include the dicarboxylic acid compounds described above.
- the organic polymer compound has a weight average molecular weight of, for example, 1,000 to 1,000,000, or 3,000 to 300,000, or 5,000 to 200,000, or 10,000. Polymer compounds that are from 100,000 to 100,000 can be used. Only one organic polymer compound can be used, or two or more organic polymer compounds can be used in combination.
- the polymer (a) has the formula (2): (In the formula (2), A represents a direct bond or —C ( ⁇ O) —, and Ar represents a C1-6 alkyl group, a halogen atom, a hydroxy group, a carboxyl group, an amino group, a C1-6 alkoxy group, Substituted with C1-6 alkylthio group, cyano group, acetyl group, acetyloxy group, C1-6 alkoxycarbonyl group, nitro group, nitroso group, amide group, imide group, C1-6 alkoxysulfonyl group or sulfonamide group A benzene ring, a naphthalene ring, or an anthracene ring, which may be formed).
- examples of the alkyl group include a methyl group, an ethyl group, an n-butyl group, a t-butyl group, an isopropyl group, and a cyclohexyl group.
- the halogen atom includes a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- examples of the alkoxy group include a methoxy group, an ethoxy group, and a butoxy group.
- examples of the alkylthio group include a methylthio group, an ethylthio group, and a butylthio group.
- alkoxycarbonyl group examples include a methoxycarbonyl group, an ethoxycarbonyl group, and an isopropoxy group.
- alkoxysulfonyl group examples include a methoxysulfonyl group and an ethoxysulfonyl group.
- the above (a) polymer can be produced, for example, by the method described in Japanese Patent No. 5041175.
- solvent for dissolving the solid component 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, propylene glycol monomethyl ether acetate, propylene glycol propyl ether acetate, toluene, xylene, methyl ethyl ketone, cyclopentanone, cyclohexanone, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, ethyl ethoxyacetate, Ethyl hydroxyacetate, methyl 2-hydroxy-3-methylbutanoate , Methyl 3-methoxypropionate, ethyl 3-methoxypropionate, ethyl 3-methoxypropionate, eth
- a high boiling point solvent such as propylene glycol monobutyl ether or propylene glycol monobutyl ether acetate can be mixed and used.
- propylene glycol monomethyl ether propylene glycol monomethyl ether acetate, ethyl lactate, butyl lactate, and cyclohexanone are preferable for improving the leveling property.
- the resist underlayer film forming composition of the present invention is preferably cross-linked at the time of baking for forming an antireflection film after coating, in order to prevent intermixing with the overcoated photoresist.
- the forming composition can further comprise a crosslinker component. Examples of such a cross-linking agent include melamine compounds and substituted urea compounds having a cross-linking substituent such as a methylol group or a methoxymethyl group.
- compounds such as tetramethoxymethylurea and tetrabutoxymethylurea are also included.
- the amount of the crosslinking agent added varies depending on the type of coating solvent used, the type and shape of the underlying substrate used, various properties required for the resist underlayer film, etc., but is 0.001 to 20% by mass in the total composition.
- the amount is preferably 0.01 to 15% by mass, more preferably 0.05 to 10% by mass.
- these crosslinking agents may cause a crosslinking reaction by self-condensation, the crosslinking forming substituent in the polymer (a) contained in the resist underlayer film forming composition of the present invention, for example, hydroxy in the formula (2) It can also cause a crosslinking reaction with the group.
- the catalyst for promoting the crosslinking reaction includes p-toluenesulfonic acid, p-phenolsulfonic acid, trifluoromethanesulfonic acid, pyridinium p-toluenesulfonic acid, pyridinium p-phenolsulfonic acid, pyridinium trifluoromethane.
- Acidic compounds such as sulfonic acid, trifluoroacetic acid, sulfosalicylic acid, citric acid and / or thermal acid generation such as 2,4,4,6-tetrabromocyclohexadienone, benzoin tosylate, 2-nitrobenzyl tosylate
- An agent can be added.
- the blending amount is usually 0.02 to 10% by mass, preferably 0.04 to 5% by mass in the total solid content.
- the resist underlayer film forming composition of the present invention may further contain a resin having at least one crosslinkable substituent selected from a hydroxy group, a carboxyl group, an amino group, and a thiol group.
- a resin having at least one crosslinkable substituent selected from a hydroxy group, a carboxyl group, an amino group, and a thiol group By adding such a resin, various characteristics of the resist underlayer film formed from the resist underlayer film forming composition of the present invention can be adjusted.
- examples of such resins include 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, vinyl alcohol, 2-hydroxyethyl vinyl ether, acrylic acid, and methacrylic acid.
- One example is a resin to be contained.
- the weight average molecular weight of such a resin may be 500 to 1,000,000, preferably 500 to 500,000.
- the resin content in the resist underlayer film forming composition of the present invention is 20% by mass or less, preferably 15% by mass or less, based on the total solid content.
- Such a resin examples include poly-2-hydroxyethyl methacrylate, polyvinyl alcohol, polyacrylic acid, a copolymer of 2-hydroxypropyl acrylate and methyl methacrylate, a copolymer of 2-hydroxypropyl acrylate and isopropyl methacrylate, 2 -Copolymer of hydroxypropyl methacrylate and 2,2,2-trichloroethyl methacrylate, Copolymer of 2-hydroxypropyl methacrylate and 2,2,2-trifluoroethyl methacrylate, 2-hydroxypropyl methacrylate and 2-chloroethyl Copolymer of methacrylate, copolymer of 2-hydroxypropyl methacrylate and cyclohexyl methacrylate, 2-hydroxypropyl methacrylate and normal octyl methacrylate Copolymer, copolymer of 2-hydroxypropyl methacrylate and vinyl alcohol, copolymer of 2-hydroxypropyl me
- Photoacid generator A photoacid generator can be added to the resist underlayer film forming composition of the present invention in order to match the acidity of the resist underlayer film and the photoresist coated on the upper layer in the lithography process.
- Preferred photoacid generators include, for example, onium salt photoacid generators such as bis (4-t-butylphenyl) iodonium trifluoromethanesulfonate, triphenylsulfonium trifluoromethanesulfonate, and phenyl-bis (trichloromethyl) -s.
- -Halogen-containing compound photoacid generators such as triazine, and sulfonic acid photoacid generators such as benzoin tosylate and N-hydroxysuccinimide trifluoromethanesulfonate.
- the addition amount of the photoacid generator is 0.02 to 3% by mass, preferably 0.04 to 2% by mass, based on the total solid content.
- Light Absorbing Compound A light absorbing compound can be further added to the resist underlayer film forming composition of the present invention.
- Various characteristics of the resist underlayer film formed from the resist underlayer film forming composition of the present invention can be adjusted by adding a light absorbing compound.
- a light-absorbing compound has a high absorptivity to light in the photosensitive characteristic wavelength region of the photosensitive component in the photoresist layer provided on the resist underlayer film, and a standing wave generated by reflection from the substrate. As long as it can prevent irregular reflection due to a step on the surface of the substrate, it can be used.
- the addition amount of the light absorbing compound in the resist underlayer film forming composition of the present invention is 0.01% by mass or more, 1% by mass to 90% by mass, for example, 1% by mass to 50% in the total solid content. For example, 5% by mass to 40% by mass.
- phenyl compounds, benzophenone compounds, benzotriazole compounds, azo compounds, naphthalene compounds, anthracene compounds, anthraquinone compounds, triazine compounds, triazine trione compounds, quinoline compounds and the like can be used.
- Phenyl compounds, naphthalene compounds, anthracene compounds, triazine compounds, and triazine trione compounds are preferably used.
- phenyl compounds having at least one hydroxy group, amino group or carboxyl group
- naphthalene compounds having at least one hydroxy group, amino group or carboxyl group
- anthracene compounds having at least one hydroxy group, amino group or carboxyl group Is done.
- Phenyl compound As the phenyl compound having at least one hydroxy group, amino group or carboxyl group, phenol, bromophenol, 4,4′-sulfonyldiphenol, tert-butylphenol, biphenol, benzoic acid, salicylic acid, hydroxyisophthalic acid, phenyl Examples include acetic acid, aniline, benzylamine, benzyl alcohol, cinnamyl alcohol, phenylalanine, phenoxypropanol, and the like.
- Naphthalene compound As the naphthalene compound having at least one hydroxy group, amino group, or carboxyl group, 1-naphthalenecarboxylic acid, 2-naphthalenecarboxylic acid, 1-naphthol, 2-naphthol, 1-aminonaphthalene, naphthylacetic acid, 1 -Hydroxy-2-naphthalenecarboxylic acid, 3-hydroxy-2-naphthalenecarboxylic acid, 3,7-dihydroxy-2-naphthalenecarboxylic acid, 6-bromo-2-hydroxynaphthalene, 2,6-naphthalenedicarboxylic acid, etc. Can be mentioned.
- Anthracene Compound examples include 9-anthracene carboxylic acid, 9-hydroxymethylanthracene, and 1-aminoanthracene.
- composition for forming a resist underlayer film of the present invention may contain other rheology modifiers, surfactants and the like as necessary.
- the rheology modifier is added mainly for the purpose of improving the fluidity of the resist underlayer film forming composition and, in particular, in the firing step, for enhancing the filling property of the resist underlayer film forming composition into the hole.
- phthalic acid derivatives such as dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, dihexyl phthalate, butyl isodecyl phthalate, adipic acid derivatives such as dinormal butyl adipate, diisobutyl adipate, diisooctyl adipate, octyl decyl adipate
- maleic acid derivatives such as normal butyl maleate, diethyl maleate and dinonyl maleate
- oleic acid derivatives such as methyl oleate, butyl oleate and tetrahydrofurfuryl oleate
- stearic acid derivatives such as normal butyl stearate and glyceryl stearate. it can.
- These rheology modifiers are usually blended in a proportion of less than 30% by mass in the total composition of the antireflection film material for lith
- a surfactant in the resist underlayer film forming composition of the present invention, can be blended in order to further improve the applicability to surface unevenness without occurrence of pinholes and setups.
- the surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, polyoxyethylene octylphenol ether, polyoxyethylene nonyl Polyoxyethylene alkyl allyl ethers such as phenol ether, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate Sorbitan fatty acid esters such as rate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sol
- Nonionic surfactants such as polyoxyethylene
- a semiconductor device can be manufactured by the step, the step of etching the lower layer film with a resist pattern, and the step of processing the semiconductor substrate with a patterned lower layer film.
- a resist underlayer film forming composition containing the additive according to the present invention can be applied to a semiconductor substrate according to a conventional method and baked to form a resist underlayer film.
- the formed resist pattern can be used for semiconductor manufacturing.
- the semiconductor substrate is typically a silicon wafer, but an SOI (Silicon on Insulator) substrate or a compound semiconductor wafer such as gallium arsenide (GaAs), indium phosphide (InP), or gallium phosphide (GaP) is used. May be.
- a semiconductor substrate on which an insulating film such as a silicon oxide film, a nitrogen-containing silicon oxide film (SiON film), or a carbon-containing silicon oxide film (SiOC film) is formed may be used.
- the resist underlayer film forming composition is applied.
- coating of the resist underlayer film forming composition which concerns on this invention can be performed by a conventional method, for example, can be apply
- a resist underlayer film is formed by baking the obtained coating film.
- the firing conditions are appropriately selected from firing temperatures of 80 to 500 ° C., or 80 ° C. to 250 ° C., and firing times of 0.3 to 60 minutes.
- the firing temperature is 150 ° C. to 500 ° C.
- the firing time is 0.5 to 2 minutes.
- the thickness of the lower layer film to be formed is, for example, 10 to 1000 nm, 20 to 500 nm, 50 to 300 nm, 100 to 200 nm, or 10 to 100 nm.
- the resist underlayer film forming composition according to the present invention can be applied to a lithography process in the manufacturing process of a semiconductor device.
- a resist underlayer film forming composition according to the present invention is applied on a semiconductor substrate and baked to form a resist underlayer film (see item 3 above), and a resist is applied onto the resist underlayer film.
- a photoresist film for example, is formed on the resist underlayer film obtained above.
- the formation of the photoresist film can be performed by a well-known method, that is, by applying and baking a photoresist composition solution on the lower layer film.
- the photoresist of the film formed on the resist underlayer film of the present invention is not particularly limited as long as it is sensitive to light used for exposure. Either a negative photoresist or a positive photoresist can be used.
- a positive photoresist comprising a novolac resin and 1,2-naphthoquinonediazide sulfonic acid ester, a chemically amplified photoresist comprising a binder having a group that decomposes with an acid to increase the alkali dissolution rate and a photoacid generator, an acid
- a chemically amplified photoresist comprising a low molecular weight compound that decomposes by an alkali to increase the alkali dissolution rate of the photoresist, an alkali-soluble binder, and a photoacid generator, and a binder that has a group that decomposes by an acid to increase the alkali dissolution rate
- Examples include trade name APEX-E manufactured by Shipley, trade name PAR710 manufactured by Sumitomo Chemical Co., Ltd., and trade name SEPR430 manufactured by Shin-Etsu Chemical Co., Ltd. Also, for example, Proc. SPIE, Vol. 3999, 330-334 (2000), Proc. SPIE, Vol. 3999, 357-364 (2000), Proc. SPIE, Vol. 3999, 365-374 (2000), and fluorine-containing polymer-based photoresists.
- Exposure Exposure Next, exposure is performed through a predetermined mask.
- a KrF or ArF excimer laser is preferable as a light source, but EUV (wavelength 13.5 nm) or an electron beam may be used instead of the KrF or ArF excimer laser.
- EUV is an abbreviation for extreme ultraviolet light.
- the resist for forming the resist film may be either a positive type or a negative type.
- a KrF or ArF excimer laser is preferable, but a chemically amplified resist that is sensitive to EUV or an electron beam can also be used.
- post-exposure bake can be performed as necessary.
- the post-exposure heating is performed under conditions appropriately selected from a heating temperature of 70 ° C. to 150 ° C. and a heating time of 0.3 to 10 minutes.
- development is performed with a developer.
- a developer for example, when a positive photoresist is used, the exposed portion of the photoresist film is removed, and a photoresist pattern is formed.
- Developers include aqueous solutions of alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, aqueous solutions of quaternary ammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline, ethanolamine, propylamine, An alkaline aqueous solution such as an aqueous amine solution such as ethylenediamine can be mentioned as an example. Further, a surfactant or the like can be added to these developers.
- the development conditions are appropriately selected from a temperature of 5 to 50 ° C. and a time of 10 to 600 seconds.
- the resist pattern formed on the resist underlayer film containing the additive of the present application has a wide fall margin with respect to changes in the exposure amount in the resist development process. That is, even if the exposure amount changes, the resist pattern does not fall easily.
- the above effect is obtained, for example, by measuring the resist pattern dimension (pattern collapse limit dimension) at the maximum exposure amount (limit exposure amount) at which the resist pattern does not collapse in the (resist pattern formation and evaluation) described in the examples by the length measurement SEM. This can be confirmed by measuring.
- the resist pattern collapse prevention can be achieved. Can be judged.
- the resist underlayer film of the present invention in the portion where the photoresist film is removed is removed by dry etching to expose the semiconductor substrate.
- dry etching of the resist underlayer film of the present invention tetrafluoromethane (CF4), perfluorocyclobutane (C4F8), perfluoropropane (C3F8), trifluoromethane, carbon monoxide, argon, oxygen, nitrogen, sulfur hexafluoride, Gases such as difluoromethane, nitrogen trifluoride and chlorine trifluoride, chlorine, trichloroborane and dichloroborane can be used.
- processing of a semiconductor substrate is performed.
- the processing of the semiconductor substrate is preferably performed by dry etching with a fluorine-based gas.
- the fluorine-based gas include tetrafluoromethane (CF4), perfluorocyclobutane (C4F8), perfluoropropane (C3F8), trifluoromethane, and difluoromethane (CH2F2).
- the resist underlayer film formed from the resist underlayer film forming composition of the present invention can be used for the function of preventing reflected light and further the interaction between the substrate and the photoresist, and the photoresist depending on the process conditions.
- Functions such as prevention of adverse effects on the substrate of substances generated in the photoresist during exposure to the material or photoresist, or prevention of adverse effects on the photoresist of substances generated from the substrate during exposure or heating and baking It can be used as a membrane having
- the weight average molecular weight of the polymer shown in Synthesis Example 1 of the present specification is a measurement result by gel permeation chromatography (hereinafter abbreviated as GPC).
- the measurement conditions etc. are as follows using the Tosoh Co., Ltd. product GPC apparatus for a measurement.
- Example 1 1.44 g of polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.08 g of tetramethoxymethylglycoluril, 0.01 g of pyridinium trifluoromethanesulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.), 1,3,4 , 6-tetrakis (2-hydroxyethyl) glycoluril (product name: TH-G, manufactured by Shikoku Chemicals Co., Ltd.) (compound represented by formula (1-1-1)) 0.01 g, propylene glycol monomethyl 7.50 g of ether and 0.96 g of propylene glycol monoethyl ether acetate were mixed and dissolved to prepare a resist underlayer film forming composition of the present invention.
- Example 2 2.04 g of polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.13 g of tetramethoxymethylglycoluril, 0.01 g of pyridinium trifluoromethanesulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.), 1,3,4 , 6-tetraallyltetrahydroimidazo [4,5-d] imidazole-2,5 (1H, 3H) -dione (compound represented by formula (1-1-2)) 0.02 g, propylene glycol monomethyl ether 11 .36 g and 1.44 g of propylene glycol monoethyl ether acetate were mixed and dissolved to prepare a resist underlayer film forming composition of the present invention.
- Example 3 1.44 g of polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.08 g of tetramethoxymethylglycoluril, 0.01 g of pyridinium trifluoromethanesulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.), 1,3,4 , 6-tetraallyl-3a, 6a-dimethyltetrahydroimidazo [4,5-d] imidazole-2,5 (1H, 3H) -dione (compound represented by formula (1-1-3)) 0.01 g,
- the resist underlayer film forming composition of the present invention was prepared by mixing and dissolving 7.50 g of propylene glycol monomethyl ether and 0.96 g of propylene glycol monoethyl ether acetate.
- Example 4 2.04 g of polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.13 g of tetramethoxymethylglycoluril, 0.01 g of pyridinium trifluoromethanesulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.), 1,3,4 , 6-Tetrakis (2-mercaptoethyl) glycoluril (compound represented by formula (1-1-4)) 0.02 g, propylene glycol monomethyl ether 11.36 g and propylene glycol monoethyl ether acetate 1.44 g Then, the resist underlayer film forming composition of the present invention was prepared.
- ⁇ Comparative Example 1> 1.49 g of the polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.09 g of tetramethoxymethyl glycoluril, 0.01 g of pyridinium trifluoromethanesulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.), propylene glycol monomethyl ether 7 .45 g and 0.96 g of propylene glycol monoethyl ether acetate were mixed and dissolved to prepare a resist underlayer film forming composition of the present invention.
- This comparative example is an example not including the additive according to the present invention.
- ⁇ Reference Example 1> 1.49 g of the polymer solution (resin binder) obtained in Synthesis Example 1 above, 1,3,4,6-tetrakis (2-hydroxyethyl) glycoluril (product name: TH-G, manufactured by Shikoku Kasei Kogyo Co., Ltd.) ) (Compound represented by formula (1-1-1)) 0.09 g, pyridinium trifluoromethanesulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.) 0.01 g, propylene glycol monomethyl ether 7.45 g and propylene glycol monoethyl
- the resist underlayer film forming composition of the present invention was prepared by mixing and dissolving 0.96 g of ether acetate.
- This comparative example is an example that does not include the crosslinking agent according to the present invention.
- the resist underlayer film forming composition of the present invention was prepared by mixing and dissolving 2.89 g of ether acetate. This comparative example is an example that does not include the crosslinking agent according to the present invention.
- ⁇ Reference Example 3> 1.56 g of the polymer solution (resin binder) obtained in Synthesis Example 2 above, 1,3,4,6-tetraallyltetrahydroimidazo [4,5-d] imidazole-2,5 (1H, 3H) -dione ( 0.07 g of the compound represented by the formula (1-1-2)), 0.01 g of pyridinium p-toluenesulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.), 5.48 g of propylene glycol monomethyl ether and propylene glycol monoethyl ether acetate
- the resist underlayer film forming composition of the present invention was prepared by mixing and dissolving 2.89 g.
- This comparative example is an example that does not include the crosslinking agent according to the present invention.
- the resist underlayer film forming composition of the present invention was prepared by mixing and dissolving 2.89 g of glycol monoethyl ether acetate. This comparative example is an example that does not include the crosslinking agent according to the present invention.
- This comparative example is an example that does not include the crosslinking agent according to the present invention.
- ⁇ Comparative Reference Example 1> 1.56 g of polymer solution (resin binder) obtained in Synthesis Example 2 above, 0.07 g of tetramethoxymethyl glycoluril, 0.01 g of pyridinium paratoluenesulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.), propylene glycol monomethyl ether 5 .48 g and 2.89 g of propylene glycol monoethyl ether acetate were mixed and dissolved to prepare a resist underlayer film forming composition of the present invention.
- This comparative example is an example not including the additive according to the present invention.
- the resist underlayer films formed using the resist underlayer film forming compositions of Examples 1 to 4 of the present invention, Comparative Example 1 and Comparative Reference Example 1 all have a film thickness variation. Since it was 1 nm or less (1% or less of the initial film thickness), it was found to have solvent resistance. On the other hand, the resist underlayer films formed using the resist underlayer film forming compositions of Reference Examples 1 to 5 did not have solvent resistance. That is, it was confirmed that the additive according to the present invention contained in the resist underlayer film forming composition of Example 1 hardly exhibits a crosslinking reaction.
- Each of the resist underlayer film forming compositions prepared in Examples 1 to 4 and Comparative Example 1 of this specification is spin-coated on a silicon wafer so as to have a film thickness of 10 nm, and baked at 215 ° C. for 60 seconds. As a result, a resist underlayer film was formed.
- a resist solution for KrF excimer laser (manufactured by Shin-Etsu Chemical Co., Ltd., product name: SEPR-430) is spin-coated on the resist underlayer film, and baked at 100 ° C. for 90 seconds.
- An exposure apparatus for KrF excimer laser ( Using Nikon Corporation, NSR-S205C), exposure was performed under predetermined conditions. After exposure, baking (PEB) was performed at 110 ° C. for 90 seconds, cooled to room temperature on a cooling plate, developed and rinsed, and a resist pattern was formed.
- the target line width is 170 nm line and space (line 170 nm, space 170 nm), and the maximum exposure amount (limit exposure amount) at which the resist pattern does not collapse is studied in order to investigate the relationship between exposure dose change and resist pattern collapse at the optimum focus.
- the resist pattern dimension was confirmed from the length measurement SEM. Thereby, by using the additive according to the present invention, it is possible to confirm whether or not a resist pattern can be prevented from collapsing in a high exposure region and a fine resist pattern can be formed.
- Table 2 below shows the limit exposure amount and the pattern collapse limit dimension of the obtained resist pattern. The larger the limit exposure amount, the smaller the pattern collapse limit dimension, and the smaller the value, the resist pattern is less likely to collapse, and high adhesion between the resist underlayer film and the resist pattern can be expressed. It can be said.
- the resist underlayer film forming composition of Comparative Example 1 was used as a resist.
- the additive according to the present invention contained in the resist underlayer film forming compositions of Examples 1 to 4 is a resist and a resist because the limit exposure amount is higher than that in the case of forming an underlayer film and the pattern collapse limit dimension is small. It was confirmed that the adhesiveness between the lower layer films was improved and a useful effect was exhibited to prevent collapse.
- a resist underlayer film forming composition whose function of preventing pattern collapse of a resist pattern formed on a substrate is enhanced by a compound additive having a glycoluril skeleton, and the composition It is possible to provide a method of manufacturing a resist underlayer film and a semiconductor device using the above.
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Abstract
Description
[1] 下記式(1-1):
(式(1-1)中、R1~R4は、各々ヒドロキシ基、チオール基、カルボキシル基、C1~5アルコキシエチル基、C1~5アルキルサルファニル基、及びエステル結合を含む有機基からなる群より選択される少なくとも一の基により水素原子が置換されたC2~10アルキル基又は、C2~10アルケニル基であり、全て同一でも異なっていてもよく、R5及びR6は、各々水素原子、C1~10アルキル基及びフェニル基の中から選ばれる基を表す。)で表される化合物を含む、
レジスト下層膜形成組成物用添加剤。
[2] R1~R4は、ヒドロキシ基若しくはチオール基により水素原子が置換されたC2~10アルキル基又は、C2~10アルケニル基である、[1]に記載の添加剤。
[3] [1]又は[2]に記載の添加剤を含む、レジスト下層膜形成組成物。
[4] さらに、
(a)ポリマーと、
(b)溶剤と、
を含む、[3]に記載の組成物。
[5] 上記(a)ポリマーが、式(2):
(式(2)中、Aは直接結合又は-C(=O)-を表し、ArはC1~6のアルキル基、ハロゲン原子、ヒドロキシ基、カルボキシル基、アミノ基、C1~6のアルコキシ基、C1~6のアルキルチオ基、シアノ基、アセチル基、アセチルオキシ基、C1~6のアルコキシカルボニル基、ニトロ基、ニトロソ基、アミド基、イミド基、C1~6のアルコキシスルホニル基もしくはスルホンアミド基で置換されていてもよいベンゼン環、ナフタレン環、又はアントラセン環を表す。)の構造を有するものである、[4]に記載の組成物。
[6] 更に架橋剤及び架橋触媒を含む、[3]~[5]のいずれか1項に記載の組成物。
[7] [1]又は[2]に記載の添加剤を含むレジスト下層膜。
[8] [3]~[6]のいずれかに記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成することによって得られるレジスト下層膜。
[9] [3]~[6]のいずれかに記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成してレジスト下層膜を形成する工程を含む、半導体の製造に用いられるレジストパターンの形成方法。
[10] 半導体基板上に[3]~[6]のいずれかに記載のレジスト下層膜形成組成物により下層膜を形成する工程、その上にレジスト膜を形成する工程、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、レジストパターンにより該下層膜をエッチングする工程、及びパターン化された下層膜により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。
[11] [1]又は[2]に記載の添加剤をレジスト下層膜中に存在させることを含む、レジストパターン倒れを防止する方法。
[12] レジスト下層膜の形成のための、[3]~[6]のいずれかに記載のレジスト下層膜形成組成物の使用。
[13] 半導体装置の製造のための、[3]~[6]のいずれかに記載のレジスト下層膜形成組成物の使用。
[14] [3]~[6]のいずれかに記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成する工程を含む、レジスト下層膜の製造方法。
本発明に係るレジスト下層膜形成組成物用添加剤は、下記(1-1):
(式(1-1)中、R1~R4は、各々ヒドロキシ基、チオール基、カルボキシル基、C1~5アルコキシエチル基、C1~5アルキルサルファニル基、及びエステル結合を含む有機基からなる群より選択される少なくとも一の基により水素原子が置換されたC2~10アルキル基であり、これらは全て同一でも異なっていてもよく、R5及びR6は、各々水素原子、C1~10アルキル基又はフェニル基の中から選ばれる基を表す。)で表されるものとすることができる。
(式(1-1)中、R1~R4は、水素原子が置換されていないC2~10アルケニル基であり、これらは全て同一でも異なっていてもよく、R5及びR6は、各々水素原子、C1~10アルキル基及びフェニル基の中から選ばれる基を表す。)で表されるものであってもよい。
式(1-1-1)(1,3,4,6-テトラキス(2-ヒドロキシエチル)グリコールウリル)
下記式(1-1-2):
下記式(1-1-2)(1,3,4,6-テトラアリルテトラヒドロイミダゾ[4,5-d]イミダゾール-2,5(1H,3H)-ジオン)
下記式(1-1-3):
式(1-1-3)(1,3,4,6-テトラアリル-3a,6a-ジメチルテトラヒドロイミダゾ[4,5-d]イミダゾール-2,5(1H,3H)-ジオン)
又は、式(1-1-4)
式(1-1-4)(1,3,4,6-テトラキス(2-メルカプトエチル)グリコールウリル)
の化合物であり、式(1-1-1)又は式(1-1-2)の化合物が最も好ましい。
次に、本発明に係るグリコールウリル骨格を持つ化合物を添加剤として含むレジスト下層膜形成組成物について説明する。本発明に係るこの組成物は、短波長の照射光、特にKrFエキシマレーザー(波長248nm)、ArFエキシマレーザー(波長193nm)又は極端紫外線(EUV、波長13.5nm)の照射光を使用して行われる半導体装置製造のリソグラフィープロセスに用いることのできるレジスト下層膜形成組成物である。
ポリマーを使用することにより、本発明のレジスト下層膜形成組成物から形成されるレジスト下層膜のドライエッチング速度(単位時間当たりの膜厚の減少量)、減衰係数及び屈折率等を調整することができる。
ポリマーとしては特に制限はなく、種々の有機ポリマーを使用することができる。例えば、ポリエステル、ポリスチレン、ポリイミド、アクリルポリマー、メタクリルポリマー、ポリビニルエーテル、フェノールノボラック、ナフトールノボラック、ポリエーテル、ポリアミド、ポリカーボネート等の付加重合ポリマー及び縮重合ポリマーや開環重合ポリマーを使用することができる。吸光部位として機能するベンゼン環、ナフタレン環、アントラセン環、トリアジン環、キノリン環、及びキノキサリン環等の芳香環構造を有する有機ポリマーが好ましく使用される。
等の化合物を挙げることができる。
有機ポリマー化合物は一種のみを使用することができ、又は二種以上を組み合わせて使用することができる。
(式(2)中、Aは直接結合又は-C(=O)-を表し、ArはC1~6のアルキル基、ハロゲン原子、ヒドロキシ基、カルボキシル基、アミノ基、C1~6のアルコキシ基、C1~6のアルキルチオ基、シアノ基、アセチル基、アセチルオキシ基、C1~6のアルコキシカルボニル基、ニトロ基、ニトロソ基、アミド基、イミド基、C1~6のアルコキシスルホニル基もしくはスルホンアミド基で置換されていてもよいベンゼン環、ナフタレン環、又はアントラセン環を表す。)の構造を有するものである。
本発明で、固形分成分を溶解させる溶剤としては、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、メチルセロソルブアセテート、エチルセロソルブアセテート、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、プロピレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールプロピルエーテルアセテート、トルエン、キシレン、メチルエチルケトン、シクロペンタノン、シクロヘキサノン、2ーヒドロキシプロピオン酸エチル、2-ヒドロキシ-2-メチルプロピオン酸エチル、エトキシ酢酸エチル、ヒドロキシ酢酸エチル、2-ヒドロキシ-3-メチルブタン酸メチル、3-メトキシプロピオン酸メチル、3-メトキシプロピオン酸エチル、3-エトキシプロピオン酸エチル、3-エトキシプロピオン酸メチル、ピルビン酸メチル、ピルビン酸エチル、酢酸エチル、酢酸ブチル、乳酸エチル、乳酸ブチル、等を用いることができる。これらの有機溶剤は単独で、または2種以上の組合せで使用される。
2.3.1.架橋剤
本発明のレジスト下層膜形成組成物は、上塗りするフォトレジストとのインターミキシングを防ぐ意味で、塗布後、反射防止膜形成のための焼成時に架橋させることが好ましく、本発明のレジスト下層膜形成組成物はさらに架橋剤成分を含むことができる。そのような架橋剤としては、メチロール基、メトキシメチル基といった架橋形成置換基を有するメラミン系化合物や置換尿素系化合物が挙げられる。少なくとも2個の架橋形成置換基を有する架橋剤であり、メトキシメチル化グリコウリル、またはメトキシメチル化メラミンなどの化合物であり、好ましくは、テトラメトキシメチルグリコールウリル、またはヘキサメトキシメチルメラミンである。また、テトラメトキシメチル尿素、テトラブトキシメチル尿素などの化合物も挙げられる。
本発明では前記架橋反応を促進するための触媒として、p-トルエンスルホン酸、p-フェノールスルホン酸、トリフルオロメタンスルホン酸、ピリジニウムp-トルエンスルホン酸、ピリジニウムp-フェノールスルホン酸、ピリジニウムトリフルオロメタンスルホン酸、トリフルオロ酢酸、スルホサリチル酸、クエン酸、などの酸性化合物及び/又は、2,4,4,6-テトラブロモシクロヘキサジエノン、ベンゾイントシラート、2-ニトロベンジルトシラート等の熱酸発生剤を配合する事が出来る。配合量としては全固形分中で、通常0.02~10質量%、好ましくは0.04~5質量%である。
本発明のレジスト下層膜形成組成物には更に、ヒドロキシ基、カルボキシル基、アミノ基及びチオール基の中から選ばれる少なくとも一つの架橋形成置換基を有する樹脂を添加することができる。このような樹脂を添加することにより、本発明のレジスト下層膜形成組成物より形成されるレジスト下層膜の諸特性を調節することができる。そのような樹脂としては、2-ヒドロキシエチルアクリレート、2-ヒドロキシプロピルアクリレート、2-ヒドロキシエチルメタクリレート、2-ヒドロキシプロピルメタクリレート、ビニルアルコール、2-ヒドロキシエチルビニルエーテル、アクリル酸、メタクリル酸などを構成単位の一つとして含有する樹脂を挙げることができる。このような樹脂の重量平均分子量としては500~1,000,000であればよく、好ましくは500~500,000である。本発明のレジスト下層膜形成組成物におけるこのような樹脂の含有量としては全固形分中、20質量%以下、好ましくは15質量%以下の割合である。
本発明のレジスト下層膜形成組成物には、レジスト下層膜とリソグラフィー工程で上層に被覆されるフォトレジストとの酸性度を一致させる為に、光酸発生剤を添加する事ができる。好ましい光酸発生剤としては、例えば、ビス(4-t-ブチルフェニル)ヨードニウムトリフルオロメタンスルホネート、トリフェニルスルホニウムトリフルオロメタンスルホネート等のオニウム塩系光酸発生剤類、フェニル-ビス(トリクロロメチル)-s-トリアジン等のハロゲン含有化合物系光酸発生剤類、ベンゾイントシレート、N-ヒドロキシスクシンイミドトリフルオロメタンスルホネート等のスルホン酸系光酸発生剤類等が挙げられる。上記光酸発生剤の添加量としては全固形分中、0.02~3質量%、好ましくは0.04~2質量%である。
本発明のレジスト下層膜形成組成物には更に、吸光性化合物を添加することができる。吸光性化合物を添加することにより、本発明のレジスト下層膜形成組成物より形成されるレジスト下層膜の諸特性を調節することが可能である。このような吸光性化合物としては、レジスト下層膜の上に設けられるフォトレジスト層中の感光成分の感光特性波長領域における光に対して高い吸収能を有し、基板からの反射によって生じる定在波や基板表面の段差による乱反射を防げるものであれば用いることができる。
少なくとも1つのヒドロキシ基、アミノ基又はカルボキシル基を有するフェニル化合物としては、フェノール、ブロモフェノール、4,4’-スルフォニルジフェノール、tert-ブチルフェノール、ビフェノール、安息香酸、サリチル酸、ヒドロキシイソフタル酸、フェニル酢酸、アニリン、ベンジルアミン、ベンジルアルコール、シンナミルアルコール、フェニルアラニン、フェノキシプロパノール、等を挙げることができる。
少なくとも1つのヒドロキシ基、アミノ基、又はカルボキシル基を有するナフタレン化合物としては、1-ナフタレンカルボン酸、2-ナフタレンカルボン酸、1-ナフトール、2-ナフトール、1-アミノナフタレン、ナフチル酢酸、1-ヒドロキシ-2-ナフタレンカルボン酸、3-ヒドロキシ-2-ナフタレンカルボン酸、3,7-ジヒドロキシ-2-ナフタレンカルボン酸、6-ブロモ-2-ヒドロキシナフタレン、2,6-ナフタレンジカルボン酸、等を挙げることができる。
少なくとも1つのヒドロキシ基、アミノ基、又はカルボキシル基を有するアントラセン化合物としては、9-アントラセンカルボン酸、9-ヒドロキシメチルアントラセン、1-アミノアントラセン、等を挙げることができる。
本発明のレジスト下層膜形成組成物には、上記以外に必要に応じて更なるレオロジー調整剤、界面活性剤などを添加することができる。
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、特に焼成工程において、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、リソグラフィー用反射防止膜材料の全組成物中、通常30質量%未満の割合で配合される。
本発明のレジスト下層膜形成組成物には、ピンホールやストレーション等の発生がなく、表面むらに対する塗布性をさらに向上させるために、界面活性剤を配合することができる。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エノールエーテル、ポリオキシエチレンノニルフエノールエーテル等のポリオキシエチレンアルキルアリルエーテル類、ポリオキシエチレン・ポリオキシプロピレンブロツクコポリマー類、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、エフトツプEF301、EF303、EF352((株)トーケムプロダクツ製)、メガフアツクF171、F173(大日本インキ(株)製)、フロラードFC430、FC431(住友スリーエム(株)製)、アサヒガードAG710、サーフロンS-382、SC101、SC102、SC103、SC104、SC105、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)等を挙げることができる。これらの界面活性剤の配合量は、本発明のレジスト下層膜形成組成物の全組成物中、通常0.2質量%以下、好ましくは0.1質量%以下である。これらの界面活性剤は単独で添加してもよいし、また2種以上の組合せで添加することもできる。
半導体基板上に本発明に係るレジスト下層膜形成組成物により下層膜を形成する工程、その上にレジスト膜を形成する工程、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、レジストパターンにより該下層膜をエッチングする工程、及びパターン化された下層膜により半導体基板を加工する工程により、半導体装置を製造することができる。
本発明に係る添加剤を含むレジスト下層膜形成組成物は、常法に従い半導体基板上に塗布し、焼成することによりレジスト下層膜を形成することができる。形成されたレジストパターンは、半導体の製造に用いることができる。
半導体基板は、代表的にはシリコンウエハーであるが、SOI(Silicon on Insulator)基板、または砒化ガリウム(GaAs)、リン化インジウム(InP)、リン化ガリウム(GaP)などの化合物半導体ウエハーを用いてもよい。酸化珪素膜、窒素含有酸化珪素膜(SiON膜)、炭素含有酸化珪素膜(SiOC膜)などの絶縁膜が形成された半導体基板を用いてもよく、その場合、当該絶縁膜上に本発明に係るレジスト下層膜形成組成物を塗布する。
本発明に係るレジスト下層膜形成組成物の塗布は慣用の方法で行うことができ、例えば、スピナー、コーター等の適当な塗布方法により塗布することができる。
得られた塗布膜を焼成することによりレジスト下層膜が形成される。焼成条件としては、焼成温度80乃至500℃、又は80℃乃至250℃、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500℃、焼成時間0.5乃至2分間である。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50乃至300nmであり、又は100乃至200nm、又は10乃至100nmである。
本発明に係るレジスト下層膜形成組成物は、半導体装置の製造過程におけるリソグラフィー工程に適用することができる。当該リソグラフィー工程は、本発明に係るレジスト下層膜形成組成物を半導体基板上に塗布し焼成してレジスト下層膜を形成する工程(上記項目3参照)と、前記レジスト下層膜上にレジストを塗布し焼成してレジスト膜を形成する工程と、前記レジスト下層膜と前記レジスト膜で被覆された半導体基板を露光する工程と、露光後の前記レジスト膜を現像する工程とを含み、前記レジスト下層膜上にレジストパターンが形成される。
上記で得られたレジスト下層膜の上に、例えばフォトレジスト膜が形成される。フォトレジスト膜の形成は、周知の方法、すなわち、フォトレジスト組成物溶液の下層膜上への塗布及び焼成によって行うことができる。
次に、所定のマスクを通して露光が行なわれる。露光は、光源としてKrF又はArFエキシマレーザーが好ましいが、KrF又はArFエキシマレーザーにかえて、EUV(波長13.5nm)又は電子線を用いてもよい。“EUV”は極端紫外線の略称である。レジスト膜を形成するためのレジストは、ポジ型、ネガ型いずれでもよい。KrF又はArFエキシマレーザーが好ましいが、EUV又は電子線に感光する化学増幅型レジストを用いることもできる。露光後、必要に応じて露光後加熱(post exposure bake)を行うこともできる。露光後加熱は、加熱温度70℃乃至150℃、加熱時間0.3乃至10分間から適宜、選択された条件で行われる。
次いで、現像液によって現像が行なわれる。これにより、例えばポジ型フォトレジストが使用された場合は、露光された部分のフォトレジスト膜が除去され、フォトレジストパターンが形成される。
本願の添加剤を含有するレジスト下層膜上に形成されたレジストパターンは、上記レジストの現像プロセスにおいて、露光量の変化に対する、倒れマージンが広い。すなわち露光量が変化してもレジストパターンの倒れが起きにくい。
上記の効果は、例えば、実施例に記載の(レジストパターンの形成及び評価)において、レジストパターンが倒壊しない最高露光量(限界露光量)におけるレジストパターン寸法(パターン倒れ限界寸法)を測長SEMで測定することにより確認することができる。すなわち本願の添加剤を含まないレジスト下層膜上に比較して、本願の添加剤を含むレジスト下層膜上のレジストの、上記パターン倒れ限界寸法が10nm以上大きい場合、レジストのパターン倒れ防止が達成できたと判断できる。
最後に、半導体基板の加工が行なわれる。半導体基板の加工はフッ素系ガスによるドライエッチングによって行なわれることが好ましい。フッ素系ガスとしては、例えば、テトラフルオロメタン(CF4)、パーフルオロシクロブタン(C4F8)、パーフルオロプロパン(C3F8)、トリフルオロメタン、及びジフルオロメタン(CH2F2)等が挙げられる。
GPCカラム:Shodex〔登録商標〕・Asahipak〔登録商標〕(昭和電工(株))
カラム温度:40℃
溶媒:N,N-ジメチルホルムアミド(DMF)
流量:0.6ml/分
標準試料:ポリスチレン(東ソー(株))
1,4-テレフタル酸ジグリシジル(製品名:EX-711〔登録商標〕、ナガセケムテックス(株))25.00g、2,2-ジメチルコハク酸14.46g、エチルトリフェニルホスホニウムブロマイド1.60g及びプロピレングリコールモノメチルエーテル61.59gを混合し、撹拌しながら4時間加熱還流することで、ポリマー溶液を得た。この溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))41g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))41gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量4,000であった。本合成例で得られたポリマーは、本発明のレジスト下層膜形成組成物に含まれる樹脂バインダーに相当する。
グリシジルメタクリレート3g、2-ヒドロキシプロピルメタクリレート26g、2,2′-アゾビス(イソ酪酸メチル)1.8gをプロピレングリコールモノメチルエーテル46.4gに溶解させた後、別途90℃に加温したプロピレングリコールモノメチルエーテルに、窒素雰囲気化で滴下した。その後、窒素雰囲気下90℃で10時間撹拌することで、ポリマー溶液を得た。続いて得られたポリマー溶液120gと9-アントラセンカルボン酸2.5g、ベンジルトリエチルアンモニウムブロミド0.1gをプロピレングリコールモノメチルエーテル10.2gに溶解させ、窒素雰囲気下で16時間還流することで、反応溶液を得た。この溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))24g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))24gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量9000であった。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.44g、テトラメトキシメチルグリコールウリル0.08g、ピリジニウムトリフルオロメタンスルホナート(東京化成工業(株)製)0.01g、1,3,4,6-テトラキス(2-ヒドロキシエチル)グリコールウリル(製品名:TH-G、四国化成工業(株)製)(式(1-1-1)で表される化合物)0.01g、プロピレングリコールモノメチルエーテル7.50g及びプロピレングリコールモノエチルエーテルアセテート0.96gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)2.04g、テトラメトキシメチルグリコールウリル0.13g、ピリジニウムトリフルオロメタンスルホナート(東京化成工業(株)製)0.01g、1,3,4,6-テトラアリルテトラヒドロイミダゾ[4,5-d]イミダゾール-2,5(1H,3H)-ジオン(式(1-1-2)で表される化合物)0.02g、プロピレングリコールモノメチルエーテル11.36g及びプロピレングリコールモノエチルエーテルアセテート1.44gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.44g、テトラメトキシメチルグリコールウリル0.08g、ピリジニウムトリフルオロメタンスルホナート(東京化成工業(株)製)0.01g、1,3,4,6-テトラアリル-3a,6a-ジメチルテトラヒドロイミダゾ[4,5-d]イミダゾール-2,5(1H,3H)-ジオン(式(1-1-3)で表される化合物)0.01g、プロピレングリコールモノメチルエーテル7.50g及びプロピレングリコールモノエチルエーテルアセテート0.96gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)2.04g、テトラメトキシメチルグリコールウリル0.13g、ピリジニウムトリフルオロメタンスルホナート(東京化成工業(株)製)0.01g、1,3,4,6-テトラキス(2-メルカプトエチル)グリコールウリル(式(1-1-4)で表される化合物)0.02g、プロピレングリコールモノメチルエーテル11.36g及びプロピレングリコールモノエチルエーテルアセテート1.44gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.49g、テトラメトキシメチルグリコールウリル0.09g、ピリジニウムトリフルオロメタンスルホナート(東京化成工業(株)製)0.01g、プロピレングリコールモノメチルエーテル7.45g及びプロピレングリコールモノエチルエーテルアセテート0.96gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。本比較例は、本発明に係る添加剤を含まない例である。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.49g、1,3,4,6-テトラキス(2-ヒドロキシエチル)グリコールウリル(製品名:TH-G、四国化成工業(株)製)(式(1-1-1)で表される化合物)0.09g、ピリジニウムトリフルオロメタンスルホナート(東京化成工業(株)製)0.01g、プロピレングリコールモノメチルエーテル7.45g及びプロピレングリコールモノエチルエーテルアセテート0.96gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。本比較例は、本発明に係る架橋剤を含まない例である。
上記合成例2で得られたポリマー溶液(樹脂バインダー)1.56g、1,3,4,6-テトラキス(2-ヒドロキシエチル)グリコールウリル(製品名:TH-G、四国化成工業(株)製)(式(1-1-1)で表される化合物)0.07g、ピリジニウムパラトルエンスルホナート(東京化成工業(株)製)0.01g、プロピレングリコールモノメチルエーテル5.48g及びプロピレングリコールモノエチルエーテルアセテート2.89gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。本比較例は、本発明に係る架橋剤を含まない例である。
上記合成例2で得られたポリマー溶液(樹脂バインダー)1.56g、1,3,4,6-テトラアリルテトラヒドロイミダゾ[4,5-d]イミダゾール-2,5(1H,3H)-ジオン(式(1-1-2)で表される化合物)0.07g、ピリジニウムパラトルエンスルホナート(東京化成工業(株)製)0.01g、プロピレングリコールモノメチルエーテル5.48g及びプロピレングリコールモノエチルエーテルアセテート2.89gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。本比較例は、本発明に係る架橋剤を含まない例である。
上記合成例2で得られたポリマー溶液(樹脂バインダー)1.56g、1,3,4,6-テトラアリル-3a,6a-ジメチルテトラヒドロイミダゾ[4,5-d]イミダゾール-2,5(1H,3H)-ジオン(式(1-1-3)で表される化合物)0.07g、ピリジニウムパラトルエンスルホナート(東京化成工業(株)製)0.01g、プロピレングリコールモノメチルエーテル5.48g及びプロピレングリコールモノエチルエーテルアセテート2.89gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。本比較例は、本発明に係る架橋剤を含まない例である。
上記合成例2で得られたポリマー溶液(樹脂バインダー)1.56g、1,3,4,6-テトラキス(2-メルカプトエチル)グリコールウリル(式(1-1-4)で表される化合物)0.07g、ピリジニウムパラトルエンスルホナート(東京化成工業(株)製)0.01g、プロピレングリコールモノメチルエーテル5.48g及びプロピレングリコールモノエチルエーテルアセテート2.89gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。本比較例は、本発明に係る架橋剤を含まない例である。
上記合成例2で得られたポリマー溶液(樹脂バインダー)1.56g、テトラメトキシメチルグリコールウリル0.07g、ピリジニウムパラトルエンスルホナート(東京化成工業(株)製)0.01g、プロピレングリコールモノメチルエーテル5.48g及びプロピレングリコールモノエチルエーテルアセテート2.89gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。本比較例は、本発明に係る添加剤を含まない例である。
実施例1及至4、比較例1、参考例1及至5、及び比較参考例1で調製したレジスト下層膜形成組成物を、それぞれ、スピナーにより半導体基板であるシリコンウェハー上に塗布した。そのシリコンウェハーをホットプレート上に配置し、150℃または215℃で1分間ベークし、レジスト下層膜を形成した。これらのレジスト下層膜をプロピレングリコールモノメチルエーテル(PGME)/プロピレングリコールモノメチルエーテルアセテート(PGMEA)=7/3(質量比)に浸漬し、その溶剤に不溶であるか否かの確認実験を行った。
シリコンウエハー上に、本明細書の実施例1及至4、及び比較例1で調製された各レジスト下層膜形成組成物を、膜厚10nmとなるようにスピンコートし、215℃で60秒間焼成することにより、レジスト下層膜を形成した。そのレジスト下層膜上に、KrFエキシマレーザー用レジスト溶液(信越化学工業(株)製、製品名:SEPR-430)をスピンコートし、100℃で90秒間焼成を行い、KrFエキシマレーザー用露光装置((株)ニコン製、NSR-S205C)を用い、所定の条件で露光した。露光後、110℃で90秒間焼成(PEB)を行い、クーリングプレート上で室温まで冷却し、現像及びリンス処理をし、レジストパターンを形成した。
Claims (14)
- R1~R4は、ヒドロキシ基若しくはチオール基により水素原子が置換されたC2~10アルキル基又は、C2~10アルケニル基である、請求項1に記載の添加剤。
- 請求項1又は2に記載の添加剤を含む、レジスト下層膜形成組成物。
- さらに、
(a)ポリマーと、
(b)溶剤と、
を含む、請求項3に記載の組成物。 - 更に架橋剤及び架橋触媒を含む、請求項3~5のいずれか1項に記載の組成物。
- 請求項1又は2に記載の添加剤を含むレジスト下層膜。
- 請求項3~6のいずれか1項に記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成することによって得られるレジスト下層膜。
- 請求項3~6のいずれか1項に記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成してレジスト下層膜を形成する工程を含む、半導体の製造に用いられるレジストパターンの形成方法。
- 半導体基板上に請求項3~6のいずれか1項に記載のレジスト下層膜形成組成物により下層膜を形成する工程、その上にレジスト膜を形成する工程、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、レジストパターンにより該下層膜をエッチングする工程、及びパターン化された下層膜により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。
- 請求項1又は2に記載の添加剤をレジスト下層膜中に存在させることを含む、レジストパターン倒れを防止する方法。
- レジスト下層膜の形成のための、請求項3~6のいずれか1項に記載のレジスト下層膜形成組成物の使用。
- 半導体装置の製造のための、請求項3~6のいずれか1項に記載のレジスト下層膜形成組成物の使用。
- 請求項3~6のいずれか1項に記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成する工程を含む、レジスト下層膜の製造方法。
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- 2017-03-29 CN CN201780021847.XA patent/CN109313389B/zh active Active
- 2017-03-29 US US16/088,440 patent/US11131928B2/en active Active
- 2017-03-29 KR KR1020187031143A patent/KR102180026B1/ko active Active
- 2017-03-29 TW TW106110576A patent/TWI720168B/zh active
- 2017-03-29 WO PCT/JP2017/012902 patent/WO2017170696A1/ja not_active Ceased
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| KR20190074791A (ko) * | 2017-12-20 | 2019-06-28 | 이아이씨티코리아 주식회사 | 저온 속경화 에폭시 수지 조성물 |
| KR102043160B1 (ko) | 2017-12-20 | 2019-11-12 | 이아이씨티코리아 주식회사 | 저온 속경화 에폭시 수지 조성물 |
| JP2024025820A (ja) * | 2018-07-31 | 2024-02-26 | 日産化学株式会社 | レジスト下層膜形成組成物 |
| JP7730091B2 (ja) | 2018-07-31 | 2025-08-27 | 日産化学株式会社 | レジスト下層膜形成組成物 |
| KR20210083258A (ko) * | 2018-11-01 | 2021-07-06 | 닛산 가가쿠 가부시키가이샤 | 글리시딜기를 갖는 아릴렌 화합물과의 중합생성물을 포함하는 약액내성 보호막형성 조성물 |
| KR102777041B1 (ko) | 2018-11-01 | 2025-03-10 | 닛산 가가쿠 가부시키가이샤 | 글리시딜기를 갖는 아릴렌 화합물과의 중합생성물을 포함하는 약액내성 보호막형성 조성물 |
| US20220057714A1 (en) * | 2018-12-12 | 2022-02-24 | Jsr Corporation | Photosensitive resin composition, method for producing resist pattern film, and method for producing plated formed product |
| US12449731B2 (en) * | 2018-12-12 | 2025-10-21 | Isr Corporation | Photosensitive resin composition, method for producing resist pattern film, and method for producing plated formed product |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6711397B2 (ja) | 2020-06-17 |
| TW201802605A (zh) | 2018-01-16 |
| KR20180123155A (ko) | 2018-11-14 |
| CN109313389B (zh) | 2020-07-14 |
| JPWO2017170696A1 (ja) | 2019-02-07 |
| TWI720168B (zh) | 2021-03-01 |
| KR102180026B1 (ko) | 2020-11-17 |
| US20190086806A1 (en) | 2019-03-21 |
| CN109313389A (zh) | 2019-02-05 |
| US11131928B2 (en) | 2021-09-28 |
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