WO2013146670A1 - フェニルインドール含有ノボラック樹脂を含むレジスト下層膜形成組成物 - Google Patents
フェニルインドール含有ノボラック樹脂を含むレジスト下層膜形成組成物 Download PDFInfo
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- WO2013146670A1 WO2013146670A1 PCT/JP2013/058557 JP2013058557W WO2013146670A1 WO 2013146670 A1 WO2013146670 A1 WO 2013146670A1 JP 2013058557 W JP2013058557 W JP 2013058557W WO 2013146670 A1 WO2013146670 A1 WO 2013146670A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/40—Chemically modified polycondensates
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/168—Finishing the coated layer, e.g. drying, baking, soaking
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2037—Exposure with X-ray radiation or corpuscular radiation, through a mask with a pattern opaque to that radiation
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2051—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source
- G03F7/2059—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source using a scanning corpuscular radiation beam, e.g. an electron beam
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
- H01L21/31133—Etching organic layers by chemical means
Definitions
- the present invention relates to a resist underlayer film forming composition for lithography effective at the time of processing a semiconductor substrate, a resist pattern forming method using the resist underlayer film forming composition, and a method for manufacturing a semiconductor device.
- BARC Bottom Anti-Reflective Coating
- Examples of the polymer for the resist underlayer film include the following.
- a resist underlayer film forming composition using polyvinyl carbazole is exemplified (see Patent Document 1, Patent Document 2, and Patent Document 3).
- a resist underlayer film forming composition using a fluorenephenol novolak resin is disclosed (for example, see Patent Document 4).
- a resist underlayer film forming composition using a fluorene naphthol novolak resin is disclosed (see, for example, Patent Document 5).
- a resist underlayer film forming composition containing a resin having fluorenephenol and arylalkylene as repeating units is disclosed (see, for example, Patent Document 6 and Patent Document 7).
- JP-A-2-293850 Japanese Patent Laid-Open No. 1-154050 JP-A-2-22657 JP 2005-128509 A JP2007-199653A JP2007-178974 U.S. Pat. No. 7,378,217
- the present invention is to provide a resist underlayer film forming composition for use in a lithography process for manufacturing a semiconductor device.
- the present invention does not cause intermixing with the resist layer, provides an excellent resist pattern, and has a dry etching rate selection ratio close to that of the resist.
- An object of the present invention is to provide a resist underlayer film for lithography having a ratio and a resist underlayer film for lithography having a low dry etching rate selection ratio as compared with a semiconductor substrate.
- the present invention can also provide the ability to effectively absorb the reflected light from the substrate when using irradiation light having a wavelength of 248 nm, 193 nm, 157 nm or the like for fine processing.
- this invention is providing the formation method of the resist pattern using the resist underlayer film forming composition. And the resist underlayer film forming composition for forming the resist underlayer film which also has heat resistance is provided.
- R 1 , R 2 , and R 3 are substituents of a ring hydrogen atom, and each independently represents a halogen group, a nitro group, an amino group, a hydroxyl group, or an alkyl having 1 to 10 carbon atoms.
- R 4 is a hydrogen atom
- a carbon number R 5 is an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, or a combination thereof which may include an ether bond, a ketone bond, or an ester bond.
- R 6 is a hydrogen atom, or a halogen group, a nitro group, an amino group, a formyl group, a carboxyl group, a carboxyl group
- An acid alkyl ester group, an alkyl group having 1 to 10 carbon atoms which may be substituted with a hydroxyl group, an aryl group having 6 to 40 carbon atoms, or a heterocyclic group, or R 5 and R 6 are bonded to each other.
- a ring may be formed together with a carbon atom
- ring A and ring B each represent a benzene ring, a naphthalene ring or an anthracene ring
- n1, n2 and n3 are each 0 or more
- a resist underlayer film forming composition comprising a polymer having a unit structure represented by the following formula:
- the resist underlayer film forming composition according to the first aspect in which both ring A and ring B are benzene rings, n1, n2, and n3 are 0, and R 4 is a hydrogen atom
- R 5 is substituted with a hydrogen atom, a halogen group, a nitro group, an amino group, a formyl group, a carboxyl group, a carboxylic acid alkyl ester group, a phenyl group, an alkoxy group having 1 to 10 carbon atoms, or a hydroxyl group.
- a resist underlayer film forming composition according to the first aspect or the second aspect which may be a phenyl group, a naphthyl group, an anthryl group, or a pyrenyl group, and R 6 is a hydrogen atom
- the resist underlayer film forming composition according to any one of the first aspect to the third aspect further including a crosslinking agent
- the resist underlayer film forming composition according to any one of the first to fourth aspects further comprising an acid and / or an acid generator
- a resist underlayer film obtained by applying and baking the resist underlayer film forming composition according to any one of the first to fifth aspects on a semiconductor substrate As a seventh aspect, a step of forming an underlayer film with the resist underlayer film forming composition according to any one of the first to fifth aspects on a semiconductor substrate, a step of forming a resist film thereon, light or
- a method of manufacturing a semiconductor device comprising: a step of forming a
- the resist underlayer film forming composition of the present invention With the resist underlayer film forming composition of the present invention, a good resist pattern shape can be formed without causing intermixing between the upper layer portion of the resist underlayer film and the layer coated thereon.
- the resist underlayer film forming composition of the present invention can be imparted with the ability to efficiently suppress reflection from the substrate, and can also have an effect as an antireflection film for exposure light.
- the resist underlayer film forming composition of the present invention the dry etching rate selectivity close to the resist, the dry etching rate selectivity lower than that of the resist, and the dry etching rate selectivity lower than that of the semiconductor substrate are excellent.
- a resist underlayer film can be provided.
- the resist is thinned.
- the resist pattern is transferred to the lower layer film by an etching process, the substrate processing is performed using the lower layer film as a mask, or the resist pattern is transferred to the lower layer film by an etching process, and further to the lower layer film.
- the resist underlayer film and the composition for forming the same of the present invention are effective for these processes.
- the resist underlayer film of the present invention can be used as a planarizing film, a resist underlayer film, a resist layer antifouling film, or a film having dry etch selectivity. This makes it possible to easily and accurately form a resist pattern in a lithography process for manufacturing a semiconductor.
- a resist underlayer film by the resist underlayer film forming composition according to the present invention is formed on a substrate, a hard mask is formed thereon, a resist film is formed thereon, a resist pattern is formed by exposure and development, and a resist pattern Is transferred to the hard mask, the resist pattern transferred to the hard mask is transferred to the resist underlayer film, and the semiconductor substrate is processed with the resist underlayer film.
- the hard mask may be formed by a coating type composition containing an organic polymer or inorganic polymer and a solvent, or by vacuum deposition of an inorganic substance. In the vacuum deposition of an inorganic material (for example, silicon nitride oxide), the deposited material is deposited on the resist underlayer film surface.
- the temperature of the resist underlayer film surface rises to around 400 ° C.
- the polymer used is a polymer having a unit structure of the formula (1), the heat resistance is extremely high, and thermal degradation does not occur even by deposition of a deposit.
- the resist underlayer film forming composition solution prepared in Example 1 was applied on a hole wafer substrate using a spin coater and baked at 400 ° C. for 2 minutes. Observed photograph (magnification is 100,000 times).
- the resist underlayer film forming composition solution prepared in Example 2 was applied onto a hole wafer substrate using a spin coater and baked at 400 ° C. for 2 minutes. Observed photograph (magnification is 100,000 times).
- the resist underlayer film forming composition solution prepared in Example 3 was applied onto a hole wafer substrate using a spin coater and baked at 400 ° C. for 2 minutes. Observed photograph (magnification is 100,000 times).
- the resist underlayer film forming composition solution prepared in Example 4 was applied onto a hole wafer substrate using a spin coater and baked at 400 ° C. for 2 minutes. Observed photograph (magnification is 100,000 times).
- the resist underlayer film forming composition solution prepared in Comparative Example 2 was applied onto a hole wafer substrate using a spin coater and baked at 400 ° C. for 2 minutes. Observed photograph (magnification is 100,000 times).
- the resist underlayer film forming composition for lithography includes the polymer and a solvent. And it can contain a crosslinking agent and an acid, and can contain additives, such as an acid generator and surfactant, as needed.
- the solid content of the composition is 0.1 to 70% by mass, or 0.1 to 60% by mass.
- the solid content is the content ratio of all components excluding the solvent from the resist underlayer film forming composition. 1 to 100% by mass, or 1 to 99.9% by mass, or 50 to 99.9% by mass, or 50 to 95% by mass, or 50 to 90% by mass in the solid content Can do.
- the polymer used in the present invention has a weight average molecular weight of 600 to 1000000 or 600 to 200000.
- R 1 , R 2 , and R 3 are substituents of a hydrogen atom in the ring, and each independently represents a halogen group, a nitro group, an amino group, a hydroxyl group, or an alkyl group having 1 to 10 carbon atoms.
- R 4 is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, or an ether bond, a ketone bond, or an ester bond. It is a combination.
- R 5 is a hydrogen atom, a halogen group, a nitro group, an amino group, a formyl group, a carboxyl group, a carboxylic acid alkyl ester group, a phenyl group, an alkoxy group having 1 to 10 carbon atoms, or a carbon that may be substituted with a hydroxyl group.
- An aryl group of 6 to 40 or a heterocyclic group, and R 6 is substituted with a hydrogen atom, a halogen group, a nitro group, an amino group, a formyl group, a carboxyl group, a carboxylic acid alkyl ester group, or a hydroxyl group.
- Ring A and ring B each represent a benzene ring, a naphthalene ring, or an anthracene ring.
- n1, n2, and n3 are each an integer of 0 or more and up to the maximum number that can be substituted in the ring.
- alkyl group of the carboxylic acid alkyl ester group include alkyl groups having 1 to 10 carbon atoms.
- alkyl group having 1 to 10 carbon atoms examples include methyl group, ethyl group, n-propyl group, i-propyl group, cyclopropyl group, n-butyl group, i-butyl group, s-butyl group, t-butyl group, Cyclobutyl group, 1-methyl-cyclopropyl group, 2-methyl-cyclopropyl 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, cyclopentyl group, 1-methyl- Cyclobutyl group, 2-methyl-cyclobutyl group, 3-methyl-cyclobutyl group, 1,2-dimethyl-cyclopropyl group, 2,3-
- alkenyl group having 2 to 10 carbon atoms examples include ethenyl group, 1-propenyl group, 2-propenyl group, 1-methyl-1-ethenyl group, 1-butenyl group, 2-butenyl group, 3-butenyl group, 2-methyl -1-propenyl group, 2-methyl-2-propenyl group, 1-ethylethenyl group, 1-methyl-1-propenyl group, 1-methyl-2-propenyl group, 1-pentenyl group, 2-pentenyl group, 3- Pentenyl group, 4-pentenyl group, 1-n-propylethenyl group, 1-methyl-1-butenyl group, 1-methyl-2-butenyl group, 1-methyl-3-butenyl group, 2-ethyl-2- Propenyl group, 2-methyl-1-butenyl group, 2-methyl-2-butenyl group, 2-methyl-3-butenyl group, 3-methyl-1-butenyl group, 3-methyl-2-butenyl group, 3-methyl
- alkoxy group having 1 to 10 carbon atoms examples include methoxy group, ethoxy group, n-propoxy group, i-propoxy group, n-butoxy group, i-butoxy group, s-butoxy group, t-butoxy group, and n-pentyloxy.
- aryl group having 6 to 40 carbon atoms examples include phenyl group, o-methylphenyl group, m-methylphenyl group, p-methylphenyl group, o-chlorophenyl group, m-chlorophenyl group, p-chlorophenyl group, o-fluorophenyl group, p-fluorophenyl group, o-methoxyphenyl group, p-methoxyphenyl group, p-nitrophenyl group, p-cyanophenyl group, ⁇ -naphthyl group, ⁇ -naphthyl group, o-biphenylyl group M-biphenylyl group, p-biphenylyl group, 1-anthryl group, 2-anthryl group, 9-anthryl group, 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phenanthryl group and 9-phenanthryl group 1-
- the heterocyclic group is preferably an organic group composed of a 5- or 6-membered heterocyclic ring containing nitrogen, sulfur or oxygen, such as a pyrrole group, a furan group, a thiophene group, an imidazole group, an oxazole group, a thiazole group, a pyrazole group, An isoxazole group, an isothiazole group, a pyridine group, etc. are mentioned.
- Examples of the aryl group having 6 to 40 carbon atoms substituted with a hydroxyl group include groups derived from phenol, dihydroxybenzene, trihydroxybenzene, naphthol, dihydroxynaphthalene, trihydroxynaphthalene, hydroxyanthracene, dihydroxyanthracene, trihydroxyanthracene and the like. Can be mentioned.
- Ring A and ring B each represent a benzene ring, a naphthalene ring, or an anthracene ring.
- n1 is an integer of 0 to 4.
- n1 is an integer of 0 to 6.
- n1 is an integer of 0 to 8.
- n2 is an integer of 0 to 1.
- n3 is an integer from 0 to 3.
- ring B is a naphthalene ring
- n3 is an integer of 0 to 5.
- ring B is an anthracene ring, it is an integer of 0 to 7.
- R 5 is a hydrogen atom, a halogen group, a nitro group, an amino group, a formyl group, a carboxyl group, a carboxylic acid alkyl ester group, a phenyl group, an alkoxy group having 1 to 10 carbon atoms, Alternatively, a unit structure which is a phenyl group, a naphthyl group, an anthryl group, or a pyrenyl group which may be substituted with a hydroxyl group, and R 6 is a hydrogen atom can be used.
- the unit structure of the formula (1) forms a novolak resin between a heterocyclic compound containing a ring A and a ring B (a heterocyclic group-containing aromatic compound) and an aldehyde or a ketone.
- aldehydes used for the production of the polymer of the present invention include formaldehyde, paraformaldehyde, acetaldehyde, propyl aldehyde, butyraldehyde, isobutyraldehyde, valeraldehyde, capronaldehyde, 2-methylbutyraldehyde, hexyl aldehyde, undecane aldehyde, 7-methoxy.
- ketones used for the production of the polymer of the present invention are diaryl ketones, and examples thereof include diphenyl ketone, phenyl naphthyl ketone, dinaphthyl ketone, phenyl tolyl ketone, ditolyl ketone, 9-fluorenone and the like.
- the polymer used in the present invention is a novolak resin obtained by condensing a heterocyclic compound containing a ring A and a ring B (a heterocyclic group-containing aromatic compound) and an aldehyde or a ketone.
- aldehydes or ketones can be used at a ratio of 0.1 to 10 equivalents with respect to 1 equivalent of the phenyl group included in the heterocyclic group-containing aromatic compound and involved in the reaction.
- Examples of the acid catalyst used in the above condensation reaction include mineral acids such as sulfuric acid, phosphoric acid and perchloric acid, organic sulfonic acids such as p-toluenesulfonic acid and p-toluenesulfonic acid monohydrate, formic acid and oxalic acid. Carboxylic acids such as are used.
- the amount of the acid catalyst used is variously selected depending on the type of acids used. Usually, it is 0.001 to 10000 parts by mass, preferably 0.01 to 1000 parts by mass, more preferably 0.1 to 100 parts by mass with respect to 100 parts by mass of the heterocyclic group-containing aromatic compound.
- the above condensation reaction is carried out without a solvent, but is usually carried out using a solvent. Any solvent that does not inhibit the reaction can be used. Examples thereof include cyclic ethers such as tetrahydrofuran and dioxane.
- the acid catalyst used is a liquid such as formic acid, it can also serve as a solvent.
- the reaction temperature during the condensation is usually 40 ° C to 200 ° C.
- the reaction time is variously selected depending on the reaction temperature, but is usually about 30 minutes to 50 hours.
- the weight average molecular weight Mw of the polymer obtained as described above is usually 500 to 1000000, or 600 to 200000.
- the polymer which has a unit structure of Formula (1) can be illustrated below, for example.
- the above polymer can be used by mixing other polymers within 30% by mass in the whole polymer.
- These polymers include polyacrylic acid ester compounds, polymethacrylic acid ester compounds, polyacrylamide compounds, polymethacrylamide compounds, polyvinyl compounds, polystyrene compounds, polymaleimide compounds, polymaleic anhydrides, and polyacrylonitrile compounds.
- Examples of the raw material monomer for the polyacrylate compound include methyl acrylate, ethyl acrylate, isopropyl acrylate, benzyl acrylate, naphthyl acrylate, anthryl acrylate, anthryl methyl acrylate, phenyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2,2,2-trifluoroethyl acrylate, 4-hydroxybutyl acrylate, isobutyl acrylate, tert-butyl acrylate, cyclohexyl acrylate, isobornyl acrylate, 2-methoxyethyl acrylate, methoxytriethylene glycol acrylate, 2-ethoxyethyl acrylate , Tetrahydrofurfuryl acrylate, 3-methoxybutyl acrylate 2-methyl-2-adamantyl acrylate, 2-ethyl-2-adamantyl acrylate, 2-propyl-2
- the raw material monomers for the polymethacrylic acid ester compound include ethyl methacrylate, normal propyl methacrylate, normal pentyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, naphthyl methacrylate, anthryl methacrylate, anthryl methyl methacrylate, phenyl methacrylate, 2-phenylethyl methacrylate, 2 -Hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2,2,2-trifluoroethyl methacrylate, 2,2,2-trichloroethyl methacrylate, methyl acrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, isodecyl methacrylate, normal lauryl methacrylate Normal stearyl methacrylate , Methoxydiethylene glycol methacrylate, methoxypolyethylene
- Examples of the raw material monomer of the polymethacrylic acid amide compound include methacrylamide, N-methyl methacrylamide, N-ethyl methacrylamide, N-benzyl methacrylamide, N-phenyl methacrylamide, and N, N-dimethyl methacrylamide.
- Examples of the raw material monomer for the polyvinyl compound include vinyl ether, methyl vinyl ether, benzyl vinyl ether, 2-hydroxyethyl vinyl ether, phenyl vinyl ether, and propyl vinyl ether.
- Examples of the raw material monomer for the polystyrene compound include styrene, methylstyrene, chlorostyrene, bromostyrene, and hydroxystyrene.
- Examples of the raw material monomer for the polymaleimide compound include maleimide, N-methylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide.
- polymers are produced by dissolving an addition polymerizable monomer and an optionally added chain transfer agent (10% or less based on the mass of the monomer) in an organic solvent, and then adding a polymerization initiator to perform a polymerization reaction. Thereafter, it can be produced by adding a polymerization terminator.
- the addition amount of the polymerization initiator is 1 to 10% with respect to the mass of the monomer, and the addition amount of the polymerization terminator is 0.01 to 0.2% by mass.
- organic solvent used examples include propylene glycol monomethyl ether, propylene glycol monopropyl ether, ethyl lactate, cyclohexanone, methyl ethyl ketone, and dimethylformamide, chain transfer agents such as dodecane thiol and dodecyl thiol, and polymerization initiators such as azo Examples thereof include bisisobutyronitrile and azobiscyclohexanecarbonitrile, and examples of the polymerization terminator include 4-methoxyphenol.
- the reaction temperature is appropriately selected from 30 to 100 ° C.
- the reaction time is appropriately selected from 1 to 48 hours.
- the resist underlayer film forming composition of the present invention can contain a crosslinking agent component.
- the cross-linking agent include melamine type, substituted urea type, or polymer type thereof.
- a cross-linking agent having at least two cross-linking substituents methoxymethylated glycoluril, butoxymethylated glycoluril, methoxymethylated melamine, butoxymethylated melamine, methoxymethylated benzogwanamine, butoxymethylated benzogwanamine, Compounds such as methoxymethylated urea, butoxymethylated urea, methoxymethylated thiourea, or methoxymethylated thiourea.
- the condensate of these compounds can also be used.
- crosslinking agent a crosslinking agent having high heat resistance
- a compound containing a crosslinking-forming substituent having an aromatic ring (for example, a benzene ring or a naphthalene ring) in the molecule can be preferably used.
- Examples of this compound include a compound having a partial structure of the following formula (3) and a polymer or oligomer having a repeating unit of the following formula (4).
- R 10 and R 11 are each a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 20 carbon atoms
- n10 is an integer of 1 to 4
- n11 is 1 To (5-n10)
- (n10 + n11) represents an integer of 2 to 5.
- R 12 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 13 is an alkyl group having 1 to 10 carbon atoms
- n12 is an integer of 1 to 4
- n13 is 0 To (4-n12)
- (n12 + n13) represents an integer of 1 to 4.
- the oligomer and polymer can be used in the range of 2 to 100 or 2 to 50 repeating unit structures.
- the above compounds can be obtained as products of Asahi Organic Materials Co., Ltd. and Honshu Chemical Industry Co., Ltd.
- the compound of the formula (3-21) can be obtained as Asahi Organic Materials Co., Ltd., trade name TM-BIP-A.
- the compound of the formula (3-22) can be obtained as Honshu Chemical Industry Co., Ltd., trade name TMOM-BP.
- the amount of the crosslinking agent to be added varies depending on the coating solvent used, the base substrate used, the required solution viscosity, the required film shape, etc., but is 0.001 to 80% by mass with respect to the total solid content, preferably The amount is 0.01 to 50% by mass, more preferably 0.05 to 40% by mass.
- cross-linking agents may cause a cross-linking reaction by self-condensation, but when a cross-linkable substituent is present in the above-mentioned polymer of the present invention, it can cause a cross-linking reaction with those cross-linkable substituents.
- a catalyst for promoting the crosslinking reaction p-toluenesulfonic acid, trifluoromethanesulfonic acid, pyridinium p-toluenesulfonic acid, salicylic acid, sulfosalicylic acid, citric acid, benzoic acid, hydroxybenzoic acid, naphthalenecarboxylic acid And / or 2,4,4,6-tetrabromocyclohexadienone, benzoin tosylate, 2-nitrobenzyl tosylate, other organic sulfonic acid alkyl esters, quaternary ammonium salts of trifluoromethanesulfonic acid,
- a thermal acid generator such as can be blended.
- the blending amount is 0.0001 to 20% by mass, preferably 0.0005 to 10% by mass, preferably 0.01 to 3% by mass, based on the total solid content.
- a photoacid generator can be added in order to match the acidity with 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 photoacid generator is 0.2 to 10% by mass, preferably 0.4 to 5% by mass, based on the total solid content.
- further light absorbers can be added to the resist underlayer film material for lithography of the present invention as necessary.
- further light absorbers include commercially available light absorbers described in “Technical dye technology and market” (published by CMC) and “Dye Handbook” (edited by the Society of Synthetic Organic Chemistry), such as C.I. I. Disperse Yellow 1, 3, 4, 5, 7, 8, 13, 23, 31, 49, 50, 51, 54, 60, 64, 66, 68, 79, 82, 88, 90, 93, 102, 114 and 124; C. I. Disperse Orange 1, 5, 13, 25, 29, 30, 31, 44, 57, 72 and 73; I.
- the above light-absorbing agent is usually blended at a ratio of 10% by mass or less, preferably 5% by mass or less, based on the total solid content of the resist underlayer film material for lithography.
- the rheology modifier mainly improves the fluidity of the resist underlayer film forming composition, and improves the film thickness uniformity of the resist underlayer film and the fillability of the resist underlayer film forming composition inside the hole, particularly in the baking process. It is added for the purpose of enhancing.
- phthalic acid derivatives such as dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, dihexyl phthalate, and 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 at a ratio of less than 30% by mass with respect to the total solid content of the resist underlayer film material
- the adhesion auxiliary agent is added mainly for the purpose of improving the adhesion between the substrate or resist and the resist underlayer film forming composition, and preventing the resist from being peeled off particularly during development.
- Specific examples include chlorosilanes such as trimethylchlorosilane, dimethylvinylchlorosilane, methyldiphenylchlorosilane, chloromethyldimethylchlorosilane, trimethylmethoxysilane, dimethyldiethoxysilane, methyldimethoxysilane, dimethylvinylethoxysilane, diphenyldimethoxysilane, Alkoxysilanes such as enyltriethoxysilane, hexamethyldisilazane, N, N'-bis (trimethylsilyl) urea, silazanes such as dimethyltrimethylsilylamine, trimethylsilylimidazole, vinyltrichlorosilane, ⁇ -chloropropyl
- a surfactant can be blended in order to further improve the applicability to surface unevenness.
- 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 sorbit
- the blending amount of these surfactants is usually 2.0% by mass or less, preferably 1.0% by mass or less, based on the total solid content of the resist underlayer film material for lithography of the present invention.
- These surfactants may be added alone or in combination of two or more.
- the solvent for dissolving the polymer, the crosslinking agent component, the crosslinking catalyst and the like includes ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoisopropyl ether, ethylene glycol methyl ether acetate.
- a high boiling point solvent such as propylene glycol monobutyl ether or propylene glycol monobutyl ether acetate can be mixed and used.
- a high boiling point solvent such as propylene glycol monobutyl ether or propylene glycol monobutyl ether acetate
- propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monobutyl ether, ethyl lactate, butyl lactate, and cyclohexanone are preferable for improving the leveling property.
- the resist used in the present invention is a photoresist or an electron beam resist.
- the photoresist applied on the upper part of the resist underlayer film for lithography in the present invention either negative type or positive type can be used, and a positive type photoresist composed of a novolak resin and 1,2-naphthoquinonediazide sulfonic acid ester, depending on the acid.
- Chemically amplified photoresist comprising a binder having a group that decomposes to increase the alkali dissolution rate and a photoacid generator, a low molecular weight compound and photoacid that increases the alkali dissolution rate of the photoresist by decomposition with an alkali-soluble binder and acid
- Chemically amplified photoresist comprising a generator, comprising a binder having a group that decomposes with acid to increase the alkali dissolution rate, a low-molecular compound that decomposes with acid to increase the alkali dissolution rate of the photoresist, and a photoacid generator Chemically amplified photoresist with Si atoms in the skeleton
- a photoresist or the like which, for example, Rohm & Hearts Co., Ltd., and trade name APEX-E.
- an acid is generated by irradiation of a resin containing an Si-Si bond in the main chain and an aromatic ring at the terminal and an electron beam.
- examples include a composition comprising an acid generator, or a composition comprising a poly (p-hydroxystyrene) having a hydroxyl group substituted with an organic group containing N-carboxyamine and an acid generator that generates an acid upon irradiation with an electron beam. It is done.
- the acid generated from the acid generator by electron beam irradiation reacts with the N-carboxyaminoxy group of the polymer side chain, and the polymer side chain decomposes into a hydroxyl group and exhibits alkali solubility, thereby exhibiting alkali solubility.
- the acid generated from the acid generator by electron beam irradiation reacts with the N-carboxyaminoxy group of the polymer side chain, and the polymer side chain decomposes into a hydroxyl group and exhibits alkali solubility, thereby exhibiting alkali solubility.
- Acid generators that generate an acid upon irradiation with this electron beam are 1,1-bis [p-chlorophenyl] -2,2,2-trichloroethane, 1,1-bis [p-methoxyphenyl] -2,2,2 -Halogenated organic compounds such as trichloroethane, 1,1-bis [p-chlorophenyl] -2,2-dichloroethane, 2-chloro-6- (trichloromethyl) pyridine, triphenylsulfonium salts, diphenyliodonium salts, etc. Examples thereof include sulfonic acid esters such as onium salts, nitrobenzyl tosylate, and dinitrobenzyl tosylate.
- Alcohol aqueous solutions such as alcohol amines, quaternary ammonium salts such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline, and cyclic amines such as pyrrole and piperidine can be used.
- an appropriate amount of an alcohol such as isopropyl alcohol or a nonionic surfactant may be added to the alkaline aqueous solution.
- preferred developers are quaternary ammonium salts, more preferably tetramethylammonium hydroxide and choline.
- a spinner, a coater, etc. are suitably used on a substrate (for example, a transparent substrate such as a silicon / silicon dioxide coating, a glass substrate, an ITO substrate) used for manufacturing a precision integrated circuit device.
- a substrate for example, a transparent substrate such as a silicon / silicon dioxide coating, a glass substrate, an ITO substrate
- the resist underlayer film forming composition After applying the resist underlayer film forming composition by a simple coating method, it is baked and cured to form a coating type underlayer film.
- the thickness of the resist underlayer film is preferably 0.01 to 3.0 ⁇ m.
- the conditions for baking after coating are 80 to 350 ° C. and 0.5 to 120 minutes.
- a resist is applied and irradiated with light or an electron beam through a predetermined mask.
- a good resist pattern can be obtained by performing, developing, rinsing and drying. If necessary, post-irradiation heating (PEB: Post Exposure Bake) can be performed. Then, the resist underlayer film where the resist has been developed and removed by the above process is removed by dry etching, and a desired pattern can be formed on the substrate.
- PEB Post Exposure Bake
- the exposure light in the photoresist is actinic radiation such as near ultraviolet, far ultraviolet, or extreme ultraviolet (for example, EUV, wavelength 13.5 nm), for example, 248 nm (KrF laser light), 193 nm (ArF laser light), Light having a wavelength such as 157 nm (F 2 laser light) is used.
- the light irradiation can be used without particular limitation as long as it can generate an acid from a photoacid generator, and the exposure dose is 1 to 2000 mJ / cm 2 , or 10 to 1500 mJ / cm 2 , or 50. To 1000 mJ / cm 2 .
- the electron beam irradiation of an electron beam resist can be performed using an electron beam irradiation apparatus, for example.
- a step of forming the resist underlayer film on the semiconductor substrate with the resist underlayer film forming composition a step of forming a resist film thereon, a step of forming a resist pattern by light or electron beam irradiation and development, a resist pattern
- a semiconductor device can be manufactured through a step of etching the resist underlayer film and a step of processing the semiconductor substrate with the patterned resist underlayer film.
- the resist underlayer film for lithography which has a selection ratio of dry etching rates close to that of resist, is selected as a resist underlayer film for such processes, and a lower dry etching rate than resist.
- resist underlayer film for lithography having a higher ratio and a resist underlayer film for lithography having a lower dry etching rate selection ratio than a semiconductor substrate.
- a resist underlayer film can be provided with an antireflection ability, and can also have a function of a conventional antireflection film.
- a process of making the resist pattern and the resist underlayer film narrower than the pattern width at the time of developing the resist at the time of the resist underlayer film dry etching has begun to be used.
- a resist underlayer film having a selectivity of a dry etching rate close to that of the resist has been required as a resist underlayer film for such a process.
- such a resist underlayer film can be provided with an antireflection ability, and can also have a function of a conventional antireflection film.
- the substrate can be processed by selecting an appropriate etching gas. That is, a step of forming the resist underlayer film on the semiconductor substrate with the resist underlayer film forming composition, and forming a hard mask by a coating material containing a silicon component or the like or a hard mask (for example, silicon nitride oxide) on the semiconductor substrate.
- a semiconductor device can be manufactured through a step of etching the resist underlayer film with an oxygen-based gas or a hydrogen-based gas and a step of processing a semiconductor substrate with a halogen-based gas with the patterned resist underlayer film.
- the resist underlayer film forming composition for lithography of the present invention has a light absorption site incorporated into the skeleton, so there is no diffused material in the photoresist during heating and drying. Moreover, since the light absorption site has a sufficiently large light absorption performance, the effect of preventing reflected light is high.
- composition for forming a resist underlayer film for lithography of the present invention has high thermal stability, can prevent contamination of the upper layer film by decomposition products during baking, and can provide a margin for the temperature margin of the baking process. is there.
- the resist underlayer film material for lithography has a function of preventing reflection of light depending on process conditions, and further prevents the interaction between the substrate and the photoresist, or a material or photoresist used for the photoresist.
- the film can be used as a film having a function of preventing an adverse effect on a substrate of a substance generated during exposure.
- Synthesis example 1 In a 100 mL four-necked flask, 2-phenylindole (4.00 g, 0.021 mol, manufactured by Tokyo Chemical Industry Co., Ltd.), 1-naphthaldehyde (3.23 g, 0.021 mol, manufactured by Tokyo Chemical Industry Co., Ltd.), para Toluenesulfonic acid monohydrate (0.619 g, 0.0031 mol, manufactured by Kanto Chemical Co., Inc.) was added, and toluene (14.58 g, manufactured by Kanto Chemical Co., Ltd.) was added and stirred, and the temperature was raised to 110 ° C. The polymerization was started after dissolution.
- PId-NA polymer
- the weight average molecular weight Mw measured by polystyrene conversion by PIPC-NA GPC was 2400, and the polydispersity Mw / Mn was 1.35.
- Synthesis example 2 In a 100 mL four-necked flask, 2-phenylindole (3.50 g, 0.018 mol, manufactured by Tokyo Chemical Industry Co., Ltd.), 1-pyrenecarboxaldehyde (4.17 g, 0.018 mol, manufactured by Tokyo Chemical Industry Co., Ltd.), Paratoluenesulfonic acid monohydrate (0.541 g, 0.0027 mol, manufactured by Kanto Chemical Co., Inc.) was added, and 1,4-dioxane (15.25 g, manufactured by Kanto Chemical Co., Ltd.) was added and stirred. Polymerization was started by raising the temperature to 0 ° C and dissolving.
- PId-Py the target polymer (formula (2-7), hereinafter abbreviated as PId-Py) was obtained. Obtained.
- the weight average molecular weight Mw measured by GPC of PId-Py in terms of polystyrene was 1600, and the polydispersity Mw / Mn was 1.61.
- Example 1 20 g of the resin obtained in Synthesis Example 1 was mixed with 0.06 g of Megafac R-30 (Dainippon Ink Chemical Co., Ltd., trade name) as a surfactant, dissolved in 80 g of propylene glycol monomethyl ether acetate, did. Thereafter, the solution is filtered using a polyethylene microfilter having a pore size of 0.10 ⁇ m, and further filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m, so that the resist underlayer film forming composition solution used in the lithography process using a multilayer film is used.
- Megafac R-30 Dainippon Ink Chemical Co., Ltd., trade name
- Example 2 To 20 g of the resin obtained in Synthesis Example 1, TMOM-BP (manufactured by Honshu Chemical Industry Co., Ltd., trade name as a crosslinking agent, component: 3,3 ′, 5,5′-tetramethoxymethyl-4,4′-dihydroxy Biphenyl) 2.0 g, thermal acid generator TAG-289 as catalyst (trade name, manufactured by King Co., Ltd., US) 0.10 g of quaternary ammonium salt of trifluoromethanesulfonic acid, Megafac as surfactant 0.06 g of R-30 (Dainippon Ink Chemical Co., Ltd., trade name) was mixed and dissolved in 88 g of propylene glycol monomethyl ether acetate to obtain a solution.
- TAG-289 thermal acid generator
- the solution is filtered using a polyethylene microfilter having a pore size of 0.10 ⁇ m, and further filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m, so that the resist underlayer film forming composition solution used in the lithography process using a multilayer film is used.
- a polyethylene microfilter having a pore size of 0.10 ⁇ m is filtered using a polyethylene microfilter having a pore size of 0.10 ⁇ m, and further filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m, so that the resist underlayer film forming composition solution used in the lithography process using a multilayer film is used.
- Example 3 20 g of the resin obtained in Synthesis Example 2 was mixed with 0.06 g of Megafac R-30 (Dainippon Ink Chemical Co., Ltd., trade name) as a surfactant, dissolved in 80 g of propylene glycol monomethyl ether acetate, did. Thereafter, the solution is filtered using a polyethylene microfilter having a pore size of 0.10 ⁇ m, and further filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m, so that the resist underlayer film forming composition solution used in the lithography process using a multilayer film is used.
- Megafac R-30 Dainippon Ink Chemical Co., Ltd., trade name
- Example 4 To 20 g of the resin obtained in Synthesis Example 2, TMOM-BP (manufactured by Honshu Chemical Industry Co., Ltd., trade name, as a crosslinking agent, component: 3,3 ′, 5,5′-tetramethoxymethyl-4,4′-dihydroxy Biphenyl) 2.0 g, thermal acid generator TAG-289 as catalyst (trade name, manufactured by King Co., Ltd., US) 0.10 g of quaternary ammonium salt of trifluoromethanesulfonic acid, Megafac as surfactant 0.06 g of R-30 (Dainippon Ink Chemical Co., Ltd., trade name) was mixed and dissolved in 88 g of propylene glycol monomethyl ether acetate to obtain a solution.
- TAG-289 thermal acid generator
- the solution is filtered using a polyethylene microfilter having a pore size of 0.10 ⁇ m, and further filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m, so that the resist underlayer film forming composition solution used in the lithography process using a multilayer film is used.
- a polyethylene microfilter having a pore size of 0.10 ⁇ m is filtered using a polyethylene microfilter having a pore size of 0.10 ⁇ m, and further filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m, so that the resist underlayer film forming composition solution used in the lithography process using a multilayer film is used.
- Comparative Example 1 A commercial cresol novolac resin (a novolak resin obtained using cresol and formaldehyde) 20 g was mixed with 0.06 g of Megafac R-30 (trade name, manufactured by Dainippon Ink Chemical Co., Ltd.) as a surfactant. A solution was prepared by dissolving in 80 g of propylene glycol monomethyl ether acetate. Thereafter, the solution is filtered using a polyethylene microfilter having a pore size of 0.10 ⁇ m, and further filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m, so that the resist underlayer film forming composition solution used in the lithography process using a multilayer film is used.
- the weight average molecular weight Mw measured in terms of polystyrene by GPC was 4000, and the polydispersity Mw / Mn was 2.1.
- Comparative Example 2 20 g of the resin obtained in Comparative Synthesis Example 1 is mixed with 0.06 g of Megafac R-30 (Dainippon Ink Chemical Co., Ltd., trade name) as a surfactant, and dissolved in 80 g of propylene glycol monomethyl ether acetate to obtain a solution. It was. Thereafter, the solution is filtered using a polyethylene microfilter having a pore size of 0.10 ⁇ m, and further filtered using a polyethylene microfilter having a pore size of 0.05 ⁇ m, so that the resist underlayer film forming composition solution used in the lithography process using a multilayer film is used. Was prepared.
- Megafac R-30 Dainippon Ink Chemical Co., Ltd., trade name
- the resist underlayer film solutions prepared in Examples 1 to 4 were each applied on a silicon wafer using a spin coater. Baking was performed on a hot plate at 240 ° C. for 1 minute or at 400 ° C. for 2 minutes to form a resist underlayer film (film thickness: 0.25 ⁇ m). These resist underlayer films were measured for refractive index (n value) and optical extinction coefficient (also called k value and attenuation coefficient) at a wavelength of 248 nm and a wavelength of 193 nm using a spectroscopic ellipsometer. The results are shown in Table 1. [Table 1]
- the resist underlayer film forming composition solutions prepared in Examples 1 to 4 and Comparative Example 1 were each applied onto a silicon wafer using a spin coater.
- the resist underlayer film (film thickness: 0.25 ⁇ m) was formed by baking at 400 ° C. for 2 minutes on a hot plate.
- This resist underlayer film was immersed in a solvent used for the resist, for example, ethyl lactate, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, and cyclohexanone, and it was confirmed that the resist underlayer film was insoluble in the solvent.
- etching rate The following etchers and etching gases were used for measuring the dry etching rate.
- ES401 manufactured by Nippon Scientific: CF 4
- the resist underlayer film forming composition solutions prepared in Examples 1 to 4 and Comparative Example 1 were each applied onto a silicon wafer using a spin coater. Baking was performed on a hot plate at 240 ° C. for 1 minute or at 400 ° C. for 2 minutes to form a resist underlayer film (film thickness: 0.25 ⁇ m). The dry etching rate was measured using CF 4 gas as the etching gas.
- a phenol-novolak resin (commercial product, weight average molecular weight Mw measured in terms of polystyrene by GPC is 2000, polydispersity Mw / Mn is 2.5) is applied onto a silicon wafer using a spin coater. It was applied and baked at 205 ° C. for 1 minute to form a coating film. The dry etching rate was measured using CF 4 gas as the etching gas. The dry etching rate of the resist underlayer films of Examples 1 to 4 and Comparative Example 1 when the etching rate of the phenol novolac resin film (film thickness: 0.25 ⁇ m) obtained by baking at 205 ° C. for 1 minute was 1.00 A comparison was made. The results are shown in Table 2. The speed ratio is a dry etching speed ratio of (resist underlayer film) / (phenol novolac resin film). [Table 2]
- the resist underlayer film forming composition solutions prepared in Examples 1 to 4 and Comparative Example 2 were each applied onto a hole wafer substrate using a spin coater.
- the resist underlayer film (film thickness: 0.25 ⁇ m) was formed by baking at 400 ° C. for 2 minutes on a hot plate.
- a hole pattern having a diameter of 100 nm and a height of 400 nm was used as the hole wafer substrate.
- the resist underlayer film forming composition solutions prepared in Examples 1 to 4 were applied onto a hole wafer substrate using a spin coater, and the substrate after baking at 400 ° C. for 2 minutes was cut, and an electron microscope It can be seen from the photographs of FIGS. 1 to 4 observed in that that the hole is sufficiently filled.
- the resist underlayer film forming composition solution prepared in Comparative Example 2 was applied onto a hole wafer substrate using a spin coater, and the substrate after baking at 400 ° C. for 2 minutes was cut, and an electron microscope From the photograph of FIG. 5 observed in FIG. 5, there was a slight cavity partially inside the hole.
- the resist underlayer film material used in the lithography process by the multilayer film of the present invention is different from the conventional high etch rate antireflection film, and has a dry etching rate selection ratio close to or smaller than that of the photoresist, a semiconductor substrate Thus, it is possible to provide a resist underlayer film that has a lower dry etching rate selection ratio than the above and can also have an effect as an antireflection film. It was also found that the lower layer film material of the present invention has heat resistance capable of forming a hard mask on the upper layer by vapor deposition.
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Description
ポリビニルカルバゾールを用いたレジスト下層膜形成組成物が例示されている(特許文献1、特許文献2、及び特許文献3を参照)。
フルオレンフェノールノボラック樹脂を用いたレジスト下層膜形成組成物が開示されている(例えば、特許文献4参照)。
フルオレンナフトールノボラック樹脂を用いたレジスト下層膜形成組成物が開示されている(例えば、特許文献5参照)。
フルオレンフェノールとアリールアルキレンを繰り返し単位とする樹脂を含むレジスト下層膜形成組成物が開示されている(例えば、特許文献6、特許文献7参照)。
第2観点として、環A及び環Bが共にベンゼン環であり、n1、n2、及びn3が0であり、R4が水素原子である第1観点に記載のレジスト下層膜形成組成物、
第3観点として、R5が水素原子又は、ハロゲン基、ニトロ基、アミノ基、ホルミル基、カルボキシル基、カルボン酸アルキルエステル基、フェニル基、炭素数1ないし10のアルコキシ基、若しくは水酸基で置換されていても良いフェニル基、ナフチル基、アントリル基、又はピレニル基であり、R6が水素原子である第1観点又は第2観点に記載のレジスト下層膜形成組成物、
第4観点として、更に架橋剤を含む第1観点乃至第3観点のいずれか一つに記載のレジスト下層膜形成組成物、
第5観点として、更に酸及び/又は酸発生剤を含む第1観点乃至第4観点のいずれか一つに記載のレジスト下層膜形成組成物、
第6観点として、第1観点乃至第5観点のいずれか一つ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、
第7観点として、半導体基板上に第1観点乃至第5観点のいずれか一つ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、及び
第8観点として、半導体基板に第1観点乃至第5観点のいずれか一つ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、その上にハードマスクを形成する工程、更に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ハードマスクをエッチングする工程、パターン化されたハードマスク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である。
本発明のレジスト下層膜形成組成物には基板からの反射を効率的に抑制する性能を付与することも可能であり、露光光の反射防止膜としての効果を併せ持つこともできる。
本発明のレジスト下層膜形成組成物により、レジストに近いドライエッチング速度の選択比、レジストに比べて小さいドライエッチング速度の選択比や半導体基板に比べて小さいドライエッチング速度の選択比を持つ、優れたレジスト下層膜を提供することができる。
本発明において上記のリソグラフィー用レジスト下層膜形成組成物は上記ポリマーと溶剤を含む。そして、架橋剤と酸を含むことができ、必要に応じて酸発生剤、界面活性剤等の添加剤を含むことができる。この組成物の固形分は0.1乃至70質量%、または0.1乃至60質量%である。固形分はレジスト下層膜形成組成物から溶剤を除いた全成分の含有割合である。固形分中に上記ポリマーを1乃至100質量%、または1乃至99.9質量%、または50乃至99.9質量%、または50乃至95質量%、または50乃至90質量%の割合で含有することができる。
本発明に用いられるポリマーは、重量平均分子量が600乃至1000000、又は600乃至200000である。
カルボン酸アルキルエステル基のアルキル基は炭素数1乃至10のアルキル基が挙げられる。
上記複素環基としては窒素、イオウ、酸素を含む5乃至6員環の複素環からなる有機基が好ましく、例えばピロール基、フラン基、チオフェン基、イミダゾール基、オキサゾール基、チアゾール基、ピラゾール基、イソオキサゾール基、イソチアゾール基、ピリジン基等が挙げられる。
環Aがベンゼン環である場合にはn1は0乃至4の整数である。環Aがナフタレン環である場合にはn1は0乃至6の整数である。環Aがアントラセン環である場合にはn1は0乃至8の整数である。
n2は0乃至1の整数である。
そして、環Bがベンゼン環である場合にはn3は0乃至3の整数である。環Bがナフタレン環である場合にはn3は0乃至5の整数である。環Bがアントラセン環である場合には0乃至7の整数である。
そして、式(1)の単位構造ではR5が水素原子又は、ハロゲン基、ニトロ基、アミノ基、ホルミル基、カルボキシル基、カルボン酸アルキルエステル基、フェニル基、炭素数1ないし10のアルコキシ基、若しくは水酸基で置換されていても良いフェニル基、ナフチル基、アントリル基、又はピレニル基であり、R6が水素原子である単位構造を用いることができる。
酸触媒の使用量は、使用する酸類の種類によって種々選択される。通常、複素環基含有芳香族化合物100質量部に対して、0.001乃至10000質量部、好ましくは、0.01乃至1000質量部、より好ましくは0.1乃至100質量部である。
縮合時の反応温度は通常40℃乃至200℃である。反応時間は反応温度によって種々選択されるが、通常30分乃至50時間程度である。
以上のようにして得られる重合体の重量平均分子量Mwは、通常500乃至1000000、又は600乃至200000である。
ポリアクリル酸エステル化合物の原料モノマーとしては、メチルアクリレート、エチルアクリレート、イソプロピルアクリレート、ベンジルアクリレート、ナフチルアクリレート、アントリルアクリレート、アントリルメチルアクリレート、フェニルアクリレート、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、2,2,2-トリフルオロエチルアクリレート、4-ヒドロキシブチルアクリレート、イソブチルアクリレート、tert-ブチルアクリレート、シクロヘキシルアクリレート、イソボルニルアクリレート、2-メトキシエチルアクリレート、メトキシトリエチレングリコールアクリレート、2-エトキシエチルアクリレート、テトラヒドロフルフリルアクリレート、3-メトキシブチルアクリレート、2-メチル-2-アダマンチルアクリレート、2-エチル-2-アダマンチルアクリレート、2-プロピル-2-アダマンチルアクリレート、2-メトキシブチル-2-アダマンチルアクリレート、8-メチル-8-トリシクロデシルアクリレート、8-エチル-8-トリシクロデシルアクリレート、及び5-アクリロイルオキシ-6-ヒドロキシノルボルネン-2-カルボキシリック-6-ラクトン等が挙げられる。
ポリメタクリル酸エステル化合物の原料モノマーとしては、エチルメタクリレート、ノルマルプロピルメタクリレート、ノルマルペンチルメタクリレート、シクロヘキシルメタクリレート、ベンジルメタクリレート、ナフチルメタクリレート、アントリルメタクリレート、アントリルメチルメタクリレート、フェニルメタクリレート、2-フェニルエチルメタクリレート、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、2,2,2-トリフルオロエチルメタクリレート、2,2,2-トリクロロエチルメタクリレート、メチルアクリレート、イソブチルメタクリレート、2-エチルヘキシルメタクリレート、イソデシルメタクリレート、ノルマルラウリルメタクリレート、ノルマルステアリルメタクリレート、メトキシジエチレングリコールメタクリレート、メトキシポリエチレングリコールメタクリレート、テトラヒドロフルフリルメタクリレート、イソボルニルメタクリレート、tert-ブチルメタクリレート、イソステアリルメタクリレート、ノルマルブトキシエチルメタクリレート、3-クロロ-2-ヒドロキシプロピルメタクリレート、2-メチル-2-アダマンチルメタクリレート、2-エチル-2-アダマンチルメタクリレート、2-プロピル-2-アダマンチルメタクリレート、2-メトキシブチル-2-アダマンチルメタクリレート、8-メチル-8-トリシクロデシルメタクリレート、8-エチル-8-トリシクロデシルメタクリレート、5-メタクリロイルオキシ-6-ヒドロキシノルボルネン-2-カルボキシリック-6-ラクトン、及び2,2,3,3,4,4,4-ヘプタフルオロブチルメタクリレート等が挙げられる。
アクリルアミド化合物としては、アクリルアミド、N-メチルアクリルアミド、N-エチルアクリルアミド、N-ベンジルアクリルアミド、N-フェニルアクリルアミド、及びN,N-ジメチルアクリルアミド等が挙げられる。
ポリビニル化合物の原料モノマーとしては、ビニルエーテル、メチルビニルエーテル、ベンジルビニルエーテル、2-ヒドロキシエチルビニルエーテル、フェニルビニルエーテル、及びプロピルビニルエーテル等が挙げられる。
ポリスチレン化合物の原料モノマーとしては、スチレン、メチルスチレン、クロロスチレン、ブロモスチレン、及びヒドロキシスチレン等が挙げられる。
ポリマレイミド化合物の原料モノマーとしては、マレイミド、N-メチルマレイミド、N-フェニルマレイミド、及びN-シクロヘキシルマレイミド等が挙げられる。
式(3)中、R10及びR11はそれぞれ水素原子、炭素数1乃至10のアルキル基、又は炭素数6乃至20のアリール基であり、n10は1乃至4の整数であり、n11は1乃至(5-n10)の整数であり、(n10+n11)は2乃至5の整数を示す。
これらのアルキル基及びアリール基は、上記アルキル基及びアリール基を例示することができる。
架橋剤の添加量は、使用する塗布溶剤、使用する下地基板、要求される溶液粘度、要求される膜形状などにより変動するが、全固形分に対して0.001乃至80質量%、好ましくは0.01乃至50質量%、さらに好ましくは0.05乃至40質量%である。これら架橋剤は自己縮合による架橋反応を起こすこともあるが、本発明の上記のポリマー中に架橋性置換基が存在する場合は、それらの架橋性置換基と架橋反応を起こすことができる。
更なる吸光剤としては例えば、「工業用色素の技術と市場」(CMC出版)や「染料便覧」(有機合成化学協会編)に記載の市販の吸光剤、例えば、C.I.DisperseYellow1,3,4,5,7,8,13,23,31,49,50,51,54,60,64,66,68,79,82,88,90,93,102,114及び124;C.I.D isperseOrange1,5,13,25,29,30,31,44,57,72及び73;C.I.DisperseRed1,5,7,13,17,19,43,50,54,58,65,72,73,88,117,137,143,199及び210;C.I.DisperseViolet43;C.I.DisperseBlue96;C.I.FluorescentBrighteningAgent 112,135及び163;C.I.SolventOrange2及び45;C.I.SolventRed1,3,8,23,24,25,27及び49;C.I.PigmentGreen10;C.I.PigmentBrown2等を好適に用いることができる。上記吸光剤は通常、リソグラフィー用レジスト下層膜材料の全固形分に対して10質量%以下、好ましくは5質量%以下の割合で配合される。
また電子線レジストの電子線照射は、例えば電子線照射装置を用い照射することができる。
即ち、半導体基板にレジスト下層膜形成組成物により該レジスト下層膜を形成する工程、その上にケイ素成分等を含有する塗膜材料によるハードマスク又は蒸着によるハードマスク(例えば、窒化酸化ケイ素)を形成する工程、更に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ハードマスクをハロゲン系ガスでエッチングする工程、パターン化されたハードマスクにより該レジスト下層膜を酸素系ガス又は水素系ガスでエッチングする工程、及びパターン化されたレジスト下層膜によりハロゲン系ガスで半導体基板を加工する工程を経て半導体装置を製造することができる。
100mL四口フラスコに2-フェニルインドール(4.00g、0.021mol、東京化成工業(株)製)、1-ナフトアルデヒド(3.23g、0.021mol、東京化成工業(株)製)、パラトルエンスルホン酸一水和物(0.619g、0.0031mol、関東化学(株)製)を加え、トルエン(14.58g、関東化学(株)製)を仕込み撹拌し、110℃まで昇温し溶解させ重合を開始した。50分後室温まで放冷後、メタノール(300g、関東化学(株)製)へ再沈殿させた。得られた沈殿物をろ過し、減圧乾燥機で50℃、10時間乾燥し、目的とするポリマー(式(2-2)、以下PId-NAと略す)4.5gを得た。
PId-NAのGPCによるポリスチレン換算で測定される重量平均分子量Mwは2400、多分散度Mw/Mnは1.35であった。
100mL四口フラスコに2-フェニルインドール(3.50g、0.018mol、東京化成工業(株)製)、1-ピレンカルボキシアルデヒド(4.17g、0.018mol、東京化成工業(株)製)、パラトルエンスルホン酸一水和物(0.541g、0.0027mol、関東化学(株)製)を加え、1,4-ジオキサン(15.25g、関東化学(株)製)を仕込み撹拌し、110℃まで昇温し溶解させ重合を開始した。24時間後室温まで放冷後、メタノール(250g、関東化学(株)製)へ再沈殿させた。得られた沈殿物をろ過し、減圧乾燥機で50℃、10時間さらに120℃、24時間乾燥し、目的とするポリマー(式(2-7)、以下PId-Pyと略す)3.7gを得た。
PId-PyのGPCによるポリスチレン換算で測定される重量平均分子量Mwは1600、多分散度Mw/Mnは1.61であった。
窒素下、100mL四口フラスコにカルバゾール(6.69g、0.040mol、東京化成工業(株)製)、9-フルオレノン(7.28g、0.040mol、東京化成工業(株)製)、パラトルエンスルホン酸一水和物(0.76g、0.0040mol、東京化成工業(株)製)を加え、1,4-ジオキサン(6.69g、関東化学(株)製)を仕込み撹拌し、100℃まで昇温し溶解させ重合を開始した。24時間後60℃まで放冷後、クロロホルム(34g、関東化学(株)製)を加え希釈し、メタノール(168g、関東化学(株)製)へ再沈殿させた。得られた沈殿物をろ過し、減圧乾燥機で80℃、24時間乾燥し、目的とするポリマー(式(5-1)、以下PCzFLと略す)9.37gを得た。
PCzFLのGPCによるポリスチレン換算で測定される重量平均分子量Mwは2800、多分散度Mw/Mnは1.77であった。
合成例1で得た樹脂20gに、界面活性剤としてメガファックR-30(大日本インキ化学(株)製、商品名)0.06gを混合し、プロピレングリコールモノメチルエーテルアセテート80gに溶解させ溶液とした。その後、孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例1で得た樹脂20gに、架橋剤としてTMOM-BP(本州化学工業(株)製、商品名。成分は3,3’,5,5’-テトラメトキシメチル-4,4’-ジヒドロキシビフェニル)2.0g、触媒として熱酸発生剤TAG-2689(米国、King(株)製、商品名。成分はトリフルオロメタンスルホン酸の第4級アンモニウム塩)0.10g、界面活性剤としてメガファックR-30(大日本インキ化学(株)製、商品名)0.06gを混合し、プロピレングリコールモノメチルエーテルアセテート88gに溶解させ溶液とした。その後、孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例2で得た樹脂20gに、界面活性剤としてメガファックR-30(大日本インキ化学(株)製、商品名)0.06gを混合し、プロピレングリコールモノメチルエーテルアセテート80gに溶解させ溶液とした。その後、孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例2で得た樹脂20gに、架橋剤としてTMOM-BP(本州化学工業(株)製、商品名。成分は3,3’,5,5’-テトラメトキシメチル-4,4’-ジヒドロキシビフェニル)2.0g、触媒として熱酸発生剤TAG-2689(米国、King(株)製、商品名。成分はトリフルオロメタンスルホン酸の第4級アンモニウム塩)0.10g、界面活性剤としてメガファックR-30(大日本インキ化学(株)製、商品名)0.06gを混合し、プロピレングリコールモノメチルエーテルアセテート88gに溶解させ溶液とした。その後、孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
市販のクレゾールノボラック樹脂(クレゾールとホルムアルデヒドを用いて得られたノボラック樹脂)20gに、界面活性剤としてメガファックR-30(大日本インキ化学(株)製、商品名)0.06gを混合し、プロピレングリコールモノメチルエーテルアセテート80gに溶解させ溶液とした。その後、孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。GPCによるポリスチレン換算で測定される重量平均分子量Mwは4000、多分散度Mw/Mnは2.1であった。
比較合成例1で得た樹脂20gに、界面活性剤としてメガファックR-30(大日本インキ化学(株)製、商品名)0.06gを混合し、プロピレングリコールモノメチルエーテルアセテート80gに溶解させ溶液とした。その後、孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
実施例1乃至4で調製したレジスト下層膜溶液を、それぞれスピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で240℃1分間、または400℃2分間焼成し、レジスト下層膜(膜厚0.25μm)を形成した。これらのレジスト下層膜を、分光エリプソメ-タ-を用いて波長248nm及び波長193nmでの屈折率(n値)及び光学吸光係数(k値、減衰係数とも呼ぶ)を測定した。結果を表1に示した。
〔表1〕
実施例1乃至4及び比較例1で調製したレジスト下層膜形成組成物の溶液を、それぞれスピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で400℃2分間焼成し、レジスト下層膜(膜厚0.25μm)を形成した。このレジスト下層膜をレジストに使用する溶剤、例えば乳酸エチル、ならびに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、シクロヘキサノンに浸漬し、その溶剤に不溶であることを確認した。
ドライエッチング速度の測定に用いたエッチャ-及びエッチングガスは以下のものを用いた。
ES401(日本サイエンティフィック製):CF4
実施例1乃至4及び比較例1で調製したレジスト下層膜形成組成物の溶液を、それぞれスピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で240℃1分間、または400℃2分間焼成し、レジスト下層膜(膜厚0.25μm)を形成した。エッチングガスとしてCF4ガスを使用してドライエッチング速度を測定した。
また、同様にフェノ-ルノボラック樹脂(市販品、GPCによるポリスチレン換算で測定される重量平均分子量Mwは2000、多分散度Mw/Mnは2.5)溶液を、スピンコーターを用いてシリコンウェハー上に塗布し、205℃1分間焼成して塗膜を形成した。エッチングガスとしてCF4ガスを使用してドライエッチング速度を測定した。205℃1分間焼成して得られたフェノールノボラック樹脂膜(膜厚0.25μm)のエッチング速度を1.00とした時の実施例1乃至4及び比較例1のレジスト下層膜のドライエッチング速度との比較を行った。結果を表2に示した。速度比は(レジスト下層膜)/(フェノ-ルノボラック樹脂膜)のドライエッチング速度比である。
〔表2〕
実施例1乃至4及び比較例2で調製したレジスト下層膜形成組成物の溶液を、それぞれスピンコーターを用いてホールウェハー基板上に塗布した。ホットプレート上で400℃2分間焼成し、レジスト下層膜(膜厚0.25μm)を形成した。ホールウェハー基板として直径100nm、高さ400nmのホールパターンを用いた。
一方、比較例2で調製されたレジスト下層膜形成組成物の溶液を、スピンコーターを用いてホールウェハー基板上に塗布し、400℃2分間の焼成を行った後の基板を切断し、電子顕微鏡で観察した図5の写真からは、ホール内部にわずかではあるが部分的に空洞が存在していた。
Claims (8)
- 下記式(1):
(式(1)中、R1、R2、及びR3は環の水素原子の置換基であって、それぞれ独立に、ハロゲン基、ニトロ基、アミノ基、水酸基、炭素数1乃至10のアルキル基、炭素数2乃至10のアルケニル基、炭素数6乃至40のアリール基、又はエーテル結合、ケトン結合、若しくはエステル結合を含んでいても良いそれらの組み合わせである。R4は水素原子、炭素数1乃至10のアルキル基、炭素数2乃至10のアルケニル基、炭素数6乃至40のアリール基、又はエーテル結合、ケトン結合、若しくはエステル結合を含んでいても良いそれらの組み合わせである。R5は水素原子、又はハロゲン基、ニトロ基、アミノ基、ホルミル基、カルボキシル基、カルボン酸アルキルエステル基、フェニル基、炭素数1乃至10のアルコキシ基、若しくは水酸基で置換されていても良い炭素数6乃至40のアリール基、又は複素環基であり、R6は水素原子、又はハロゲン基、ニトロ基、アミノ基、ホルミル基、カルボキシル基、カルボン酸アルキルエステル基、若しくは水酸基で置換されていても良い炭素数1乃至10のアルキル基、炭素数6乃至40のアリール基、又は複素環基であり、あるいはR5とR6はそれらが結合する炭素原子と一緒になって環を形成していても良い。環A及び環Bはそれぞれベンゼン環、ナフタレン環、又はアントラセン環を示す。n1、n2、及びn3はそれぞれ0以上で、且つ環に置換できる最大の数までの整数である。)で表される単位構造を有するポリマーを含むレジスト下層膜形成組成物。 - 環A及び環Bが共にベンゼン環であり、n1、n2、及びn3が0であり、R4が水素原子である請求項1に記載のレジスト下層膜形成組成物。
- R5が水素原子、又はハロゲン基、ニトロ基、アミノ基、ホルミル基、カルボキシル基、カルボン酸アルキルエステル基、フェニル基、炭素数1乃至10のアルコキシ基、若しくは水酸基で置換されていても良いフェニル基、ナフチル基、アントリル基、又はピレニル基であり、R6が水素原子である請求項1又は請求項2に記載のレジスト下層膜形成組成物。
- 更に架橋剤を含む請求項1乃至請求項3のいずれか1項に記載のレジスト下層膜形成組成物。
- 更に酸及び/又は酸発生剤を含む請求項1乃至請求項4のいずれか1項に記載のレジスト下層膜形成組成物。
- 請求項1乃至請求項5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。
- 半導体基板上に請求項1乃至請求項5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。
- 半導体基板に請求項1乃至請求項5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、その上にハードマスクを形成する工程、更に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ハードマスクをエッチングする工程、パターン化されたハードマスク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。
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104185816B (zh) | 2017-09-29 |
| US20150044876A1 (en) | 2015-02-12 |
| JP6094767B2 (ja) | 2017-03-15 |
| KR102072490B1 (ko) | 2020-02-03 |
| KR20140144207A (ko) | 2014-12-18 |
| US8993215B2 (en) | 2015-03-31 |
| TW201407290A (zh) | 2014-02-16 |
| TWI572988B (zh) | 2017-03-01 |
| JPWO2013146670A1 (ja) | 2015-12-14 |
| CN104185816A (zh) | 2014-12-03 |
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