WO2014030579A1 - 多核フェノール類を有するノボラック樹脂を含むレジスト下層膜形成組成物 - Google Patents
多核フェノール類を有する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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- WO2014030579A1 WO2014030579A1 PCT/JP2013/071870 JP2013071870W WO2014030579A1 WO 2014030579 A1 WO2014030579 A1 WO 2014030579A1 JP 2013071870 W JP2013071870 W JP 2013071870W WO 2014030579 A1 WO2014030579 A1 WO 2014030579A1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09D161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
- C09D161/12—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols with polyhydric phenols
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- G—PHYSICS
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C39/00—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a six-membered aromatic ring
- C07C39/12—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a six-membered aromatic ring polycyclic with no unsaturation outside the aromatic rings
- C07C39/15—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a six-membered aromatic ring polycyclic with no unsaturation outside the aromatic rings with all hydroxy groups on non-condensed rings, e.g. phenylphenol
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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
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/02—Condensation polymers of aldehydes or ketones with phenols only of ketones
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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
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
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- G—PHYSICS
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- 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
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- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3088—Process specially adapted to improve the resolution of the mask
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
- H01L21/31133—Etching organic layers by chemical means
- H01L21/31138—Etching organic layers by chemical means by dry-etching
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.
- a thin film of a photoresist composition is formed on a substrate to be processed such as a silicon wafer, and irradiated with actinic rays such as ultraviolet rays through a mask pattern on which a semiconductor device pattern is drawn, and developed.
- actinic rays such as ultraviolet rays
- This is a processing method for etching a substrate to be processed such as a silicon wafer using the obtained photoresist pattern as a protective film.
- a resist underlayer film serving as an etching mask is required to have an underlayer film material having high wiggling resistance that can suppress the occurrence of wiggling even in a fine pattern.
- the resist underlayer film is required to have a resist underlayer film forming composition having flatness and embedding so as to sufficiently cover the steps and irregularities formed on the surface of the semiconductor substrate.
- 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).
- a resist underlayer film forming composition using carbazole novolak is disclosed (for example, see Patent Document 8).
- a resist underlayer film forming composition using a polynuclear phenol novolak is disclosed (for example, Patent Document 9).
- 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 International publication pamphlet WO2010 / 147155 JP 2006-259249 A
- the present invention is to provide a resist underlayer film forming composition for use in a lithography process for manufacturing a semiconductor device.
- Another object of the present invention is to have high dry etching resistance to an etching gas such as fluorocarbon, and to achieve miniaturization of semiconductor substrate processing by suppressing wiggling of the resist underlayer film in the dry etching process.
- a coating type resist underlayer film forming composition that is highly soluble in a resist solvent and can be spin-coated.
- the present invention has at least three phenol groups and the phenol group has a structure bonded to a tertiary carbon atom, or the phenol group is bonded to a quaternary carbon atom bonded to a methyl group.
- a resist underlayer film-forming composition comprising a phenol novolac resin obtained by reacting a compound having a bonded structure with an aromatic aldehyde or aromatic ketone in the presence of an acidic catalyst
- the phenol novolac resin has a unit structure of the following formula (1), a unit structure of the formula (2), a unit structure of the formula (3), a unit structure of the formula (4), or a combination of these unit structures: [In Formula (1), Formula (2), Formula (3), and Formula (4), A is an organic group having at least three phenol groups, and the phenol group is a structure bonded to a tertiary carbon atom.
- B 1 , B 2 , B 3 and B 4 are each represented by the formula (5):
- C 1 represents an aryl group or heterocyclic group having 6 to 40 carbon atoms which may be substituted with a halogen group, a nitro group, an amino group or a hydroxy group
- C 2 represents a hydrogen atom
- C 1 and C 2 are They may form a ring together with the carbon atoms to which they are attached).
- a composition for forming a resist underlayer film according to the first aspect is the formula (6):
- T is a single bond, an alkylene group having 1 to 10 carbon atoms, or an arylene group having 6 to 40 carbon atoms
- X 1 and X 2 are each a hydrogen atom or a methyl group
- R 1 To R 4 are each a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 5 to R 8 are each an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 40 carbon atoms
- n1 to n4 are Each represents an integer of 0 to 3, and each phenol group is appropriately combined with B 1 , B 2 , B 3 and B 4 above).
- the above A is the formula (7):
- R 9 to R 11 are each a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 12 to R 14 are each an alkyl group having 1 to 10 carbon atoms or a carbon number having 6 to 40 carbon atoms.
- An aryl group, X 3 is a hydrogen atom or a methyl group
- n5 to n7 each represent an integer of 0 to 3
- each phenol group is appropriately bonded to B 1 , B 2 , B 3 and B 4 above.
- the resist underlayer film forming composition according to the second aspect As a fifth aspect, the resist underlayer film forming composition according to any one of the second to fourth aspects, wherein C 1 is an anthryl group or a pyrenyl group, As a sixth aspect, the resist underlayer film forming composition according to any one of the first aspect to the fourth aspect, further including a crosslinking agent, As a seventh aspect, the resist underlayer film forming composition according to any one of the first aspect to the fifth aspect, further comprising an acid and / or an acid generator, As an eighth aspect, a resist underlayer film obtained by applying and baking the resist underlayer film forming composition according to any one of the first to seventh aspects on a semiconductor substrate, As a ninth aspect, the resist underlayer film forming composition according to any one of the first to seventh aspects is applied to a semiconductor substrate and baked to form a lower layer film.
- the resist underlayer film forming composition of the present invention can provide an excellent resist underlayer film having high dry etching resistance against an etching gas such as fluorocarbon.
- 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
- the resist pattern is transferred to the lower layer film by an etching process, and further transferred to the lower layer film.
- the substrate is finally processed by repeating the process of transferring the formed pattern to the lower layer film using a different etching gas.
- the resist underlayer film and the composition for forming the resist of the present invention are effective for this process.
- a processed substrate for example, a thermal silicon oxide film on the substrate, silicon nitride) Film, polysilicon film, etc. having sufficient etching resistance.
- 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. In particular, the occurrence of wiggling (irregular pattern bending) of the resist underlayer film in the dry etching process can be suppressed. Furthermore, it has good flatness and embeddability capable of covering the surface of a semiconductor substrate having a step or uneven portion without unevenness or voids.
- 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 novolac resin comprising the formula (1), the formula (2), the formula (3), the formula (4) or a combination thereof. Does not cause deterioration.
- this resist underlayer film forming composition is a coating type composition having high solubility in a resist solvent and excellent spin coating properties.
- Example 2 is a cross-sectional SEM photograph showing the flattening property test results of Example 1 (magnification of 100,000 times). Sectional SEM photograph showing the flattening property test result of Example 3 (magnification 100,000 times). The cross-sectional SEM photograph which shows the planarization test result of Example 4 (magnification 100,000 times). Sectional SEM photograph showing the flattening property test result of Example 6 (magnification 100,000 times). Sectional SEM photograph showing the flattening property test result of Example 7 (magnification 100,000 times). Sectional SEM photograph showing the flattening property test result of Example 8 (magnification 100,000 times). Sectional SEM photograph showing the flattening property test result of Example 9 (magnification 100,000 times).
- FIG. 10 A cross-sectional SEM photograph showing the flattening property test result of Example 10 (magnification of 100,000 times). Sectional SEM photograph showing the flattening property test result of Example 11 (magnification 100,000 times). The cross-sectional SEM photograph which shows the planarization test result of the comparative example 1 (magnification 100,000 times). A cross-sectional SEM photograph showing the flattening property test result of Comparative Example 2 (magnification of 100,000 times).
- FIG. 3 is a cross-sectional SEM photograph showing the results of an embedding test in Example 1 (magnification of 100,000 times).
- FIG. 6 is a cross-sectional SEM photograph showing the result of embedding test of Example 3 (magnification of 100,000 times).
- FIG. 10 is a cross-sectional SEM photograph showing the results of an embedding test in Example 9 (magnification of 100,000 times).
- FIG. 10 is a cross-sectional SEM photograph showing the results of an embedding test in Example 10 (magnification of 100,000 times).
- FIG. 10 is a cross-sectional SEM photograph showing the results of an embedding test in Example 11 (magnification of 100,000 times).
- FIG. 3 is a cross-sectional SEM photograph showing the result of embedding test of Comparative Example 1 (magnification of 100,000 times).
- FIG. 6 is a cross-sectional SEM photograph showing a result of embedding test of Comparative Example 2 (magnification of 100,000 times).
- the present invention has at least three phenol groups and the phenol group has a structure bonded to a tertiary carbon atom, or the phenol group has a structure bonded to a quaternary carbon atom to which a methyl group is bonded.
- It is a resist underlayer film forming composition containing the phenol novolak resin obtained by making the compound which has and aromatic aldehyde or aromatic ketone react in presence of an acidic catalyst.
- the resist underlayer film forming composition for lithography includes the resin and a solvent. And a crosslinking agent, an acid, an acid generator, surfactant, etc. can be included 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.
- the phenol novolac resin includes a unit structure of the following formula (1), a unit structure of the formula (2), a unit structure of the formula (3), a unit structure of the formula (4), or a combination of these unit structures.
- A has at least three phenol groups and the phenol group has a structure bonded to a tertiary carbon atom, or
- the phenol group is an organic group having a structure bonded to a quaternary carbon atom to which a methyl group is bonded, and B 1 , B 2 , B 3 and B 4 each represent the formula (5).
- C 1 represents an aryl group or heterocyclic group having 6 to 40 carbon atoms which may be substituted with a halogen group, a nitro group, an amino group or a hydroxy group
- C 2 represents a hydrogen atom or a halogen atom
- C 1 and C 2 are May form a ring together with carbon atoms to which.
- the alkyl group is an alkyl group having 1 to 10 carbon atoms, such as methyl group, ethyl group, n-propyl group, i-propyl group, cyclopropyl group, n-butyl group, i-butyl group, s-butyl.
- the aryl group is an aryl group having 6 to 40 carbon atoms, such as a 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- Examples include phenanthryl group and 9-phenanthryl group.
- the heterocyclic group is preferably an organic group composed of a 5- to 6-membered heterocyclic ring containing nitrogen, sulfur, and oxygen atoms.
- a pyrrole group a furan group, a thiophene group, an imidazole group, an oxazole group, a thiazole group, or a pyrazole group.
- A is represented by the formula (6) be able to.
- T is a single bond, an alkylene group having 1 to 10 carbon atoms, or an arylene group having 6 to 40 carbon atoms
- X 1 and X 2 are each a hydrogen atom or a methyl group
- R 1 to R 4 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 5 to R 8 are each an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 40 carbon atoms
- n 1 to n 4 are each 0 to 3 represents an integer of 3
- each phenol group is appropriately bonded to B 1 , B 2 , B 3 and B 4 .
- Examples of the alkyl group and aryl group include the groups described above.
- the alkylene group includes an alkylene group having 1 to 10 carbon atoms, or an arylene group having 6 to 40 carbon atoms
- X 1 and X 2 are each a hydrogen atom or
- A is represented by the formula (7) be able to.
- R 9 to R 11 are each a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 12 to R 14 are each an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 40 carbon atoms
- X 3 is a hydrogen atom or a methyl group
- n5 to n7 each represents an integer of 0 to 3
- each phenol group is appropriately bonded to B 1 , B 2 , B 3 and B 4 .
- examples of the alkyl group and the aryl group can include the above-described examples.
- a used in the present invention is a polynuclear phenol and is a compound having at least three phenyl groups having at least one hydroxy group or alkoxy group in one molecule.
- the novolak resin used in the present invention is a novolak resin obtained by condensing polynuclear phenols with aldehydes or ketones, and the polynuclear phenols can be used alone or in combination of two or more.
- polynuclear phenols used in the production of the polymer of the present invention include 1,1,2,2-tetrakis (4-hydroxyphenyl) ethane and 1,1,2,2-tetrakis (3-methyl-4-hydroxyphenyl).
- 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.
- an aromatic aldehyde can be preferably used, and 9-anthrylaldehyde and 1-pyrenecarboxaldehyde are more preferable.
- the ketones used in 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, and 9-fluorenone.
- the polymer used in the present invention is a novolak resin obtained by condensing polynuclear phenols with aldehydes or ketones.
- aldehydes or ketones can be used in a ratio of 0.1 to 10 equivalents, preferably 0.1 to 2 equivalents, per 1 equivalent of the phenyl group contained in the polynuclear phenols and involved in the reaction. It is.
- Examples of the acid catalyst used in the condensation reaction include mineral acids such as sulfuric acid, phosphoric acid and perchloric acid, organic sulfonic acids such as p-toluenesulfonic acid, p-toluenesulfonic acid monohydrate, and methanesulfonic acid, Carboxylic acids such as formic acid and oxalic acid are used.
- the amount of the acid catalyst used is variously selected depending on the type of acids used. Usually, 0.001 to 10,000 parts by mass, preferably 0.01 to 1000 parts by mass, more preferably 0.1 to 1000 parts by mass with respect to 100 parts by mass of carbazoles or the total of carbazoles and a hydroxyl group-containing aromatic compound. 100 parts by mass.
- 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.
- ethers such as 1,2-dimethoxyethane, diethylene glycol dimethyl ether, propylene glycol monomethyl ether, tetrahydrofuran, dioxane and the like can be mentioned.
- 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 phenol novolak resin used in the present invention can be exemplified as follows.
- 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.
- a crosslinking agent having high heat resistance can be used as the crosslinking agent.
- a compound containing a crosslinking-forming substituent having an aromatic ring for example, a benzene ring or a naphthalene ring
- this compound include a compound having a partial structure of the following formula (9) and a polymer or oligomer having a repeating unit of the following formula (10).
- R 15 , R 16 , R 17 , and R 18 are each independently a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and the above examples can be used for these alkyl groups.
- N15 is an integer of 1 to 4
- n16 is an integer of 1 to (5-n15)
- (n15 + n16) is an integer of 2 to 5.
- n17 is an integer of 1 to 4
- n18 is 0 to (4-n17)
- (n17 + n18) is 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 compounds, polymers and oligomers of formula (9) and formula (10) are exemplified below.
- 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 (11-24) can be obtained as Asahi Organic Materials Co., Ltd., trade name TM-BIP-A.
- 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.
- p-toluenesulfonic acid as a catalyst for promoting the crosslinking reaction, p-toluenesulfonic acid, trifluoromethanesulfonic acid, pyridinium p-toluenesulfonic acid, salicylic acid, 5-sulfosalicylic acid, 4-phenolsulfonic acid, camphorsulfonic acid, 4 -Acidic compounds such as chlorobenzenesulfonic acid, benzenedisulfonic acid, 1-naphthalenesulfonic acid, citric acid, benzoic acid, hydroxybenzoic acid, naphthalenecarboxylic acid or / and 2,4,4,6-tetrabromocyclohexadienone, benzoin Thermal acid generators such as tosylate, 2-nitrobenzyl tosylate and other organic sulfonic acid alkyl esters can be blended.
- the blending amount is 0.0001 to 20% by mass, preferably
- 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.
- Examples of 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. I. Disperse Orange 1, 5, 13, 25, 29, 30, 31, 44, 57, 72 and 73; C.I. I. Disperse Red 1, 5, 7, 13, 17, 19, 43, 50, 54, 58, 65, 72, 73, 88, 117, 137, 143, 199 and 210; I.
- Disperse Violet 43; C.I. I. Disperse Blue 96; C.I. I. Fluorescent Brightening Agent 112, 135 and 163; C.I. I. Solvent Orange 2 and 45; C.I. I. Solvent Red 1, 3, 8, 23, 24, 25, 27 and 49; I. Pigment Green 10; C.I. I. Pigment Brown 2 etc. can be used suitably.
- 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, 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 for
- the adhesion assistant is added mainly for the purpose of improving the adhesion between the substrate or the resist and the resist underlayer film forming composition, and preventing the resist from peeling 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, ⁇ -chloropropyltrimethoxy
- a surfactant can be blended in order to further improve the applicability to surface unevenness without generating pinholes or installations.
- 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 sorbitan fatty acid esters such as rate, polyoxyethylene sorbitan mono
- 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 and the crosslinking agent component, the crosslinking catalyst and the like include 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 monoethyl ether, propylene glycol monoethyl ether acetate, propylene glycol propyl ether acetate, toluene, xylene, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-hydroxypropionic acid Ethyl, 2-hydroxy-2 Ethyl methyl propionate, ethyl ethoxyacetate, ethyl hydroxyacetate, methyl 2-hydroxypropionic acid
- organic solvents are used alone or in combination of two or more.
- high boiling point solvents such as propylene glycol monobutyl ether and propylene glycol monobutyl ether acetate can be mixed and used.
- propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethyl lactate, butyl lactate, cyclohexanone and the like 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 That there is a photoresist or the like, for example, Rohm & Haas Co., and a 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, and onium salts such as triphenylsulfonium salt and diphenyliodonium salt Sulfonic acid esters such as nitrobenzyl tosylate and dinitrobenzyl tosylate.
- Alkali amines, tetramethylammonium hydroxide, tetraethylammonium hydroxide, quaternary ammonium salts such as choline, cyclic amines such as pyrrole and piperidine, and alkaline aqueous solutions such as these 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 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 during dry etching of the resist underlayer film 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 after forming the resist underlayer film of the present invention on the substrate, directly or on the resist underlayer film as needed, after forming one to several layers of coating material on the resist underlayer film, A resist can be applied. As a result, the pattern width of the resist becomes narrow, and even when the resist is thinly coated to prevent pattern collapse, the substrate can be processed by selecting an appropriate etching gas.
- 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.
- the reaction mixture was diluted with 35 g of tetrahydrofuran, and the diluted solution was reprecipitated from a mixed solvent of methanol / water (50% by mass / 50% by mass).
- the obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 9.4 g of a novolak resin (including the polymer of the formula (8-1)).
- the weight average molecular weight measured in terms of standard polystyrene from GPC was 3,600.
- the reaction mixture was diluted with 20 g of tetrahydrofuran, and the diluted solution was reprecipitated from a mixed solvent of methanol / water (80% by mass / 20% by mass).
- the obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 9.1 g of a novolak resin (including the polymer of the formula (8-20)).
- the weight average molecular weight measured by GPC in terms of standard polystyrene was 4,800.
- the reaction mixture was diluted with 20 g of tetrahydrofuran, and the diluted solution was reprecipitated from a mixed solvent of methanol / water (80% by mass / 20% by mass).
- the obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 11.2 g of a novolac resin (including the polymer of the formula (8-22)).
- the weight average molecular weight measured in terms of standard polystyrene from GPC was 5700.
- the reaction mixture was diluted with 39 g of tetrahydrofuran, and the diluted solution was reprecipitated from a mixed solvent of methanol / water (50% by mass / 50% by mass).
- the obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 10.0 g of a novolak resin (including the polymer of the formula (8-5)).
- the weight average molecular weight measured by GPC in terms of standard polystyrene was 4900.
- the reaction mixture was diluted with 22 g of tetrahydrofuran, and the diluted solution was reprecipitated from a mixed solvent of methanol / water (80% by mass / 20% by mass).
- the obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 10.2 g of a novolak resin (including the polymer of the formula (8-26)).
- the weight average molecular weight measured by GPC in terms of standard polystyrene was 7900.
- the reaction mixture was diluted with 21 g of tetrahydrofuran, and the diluted solution was reprecipitated from a mixed solvent of methanol / water (80% by mass / 20% by mass).
- the obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 10.9 g of a novolak resin (including the polymer of the formula (8-28)).
- the weight average molecular weight measured by GPC in terms of standard polystyrene was 7400.
- the reaction solution was diluted with 38 g of tetrahydrofuran, and the diluted solution was reprecipitated from a mixed solvent of methanol / water (50% by mass / 50% by mass).
- the obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 6.9 g of a novolak resin (including the polymer of the formula (8-2)).
- the weight average molecular weight measured in terms of standard polystyrene from GPC was 1,700.
- the solution was reprecipitated from a mixed solvent of methanol / water (60% by mass / 40% by mass).
- the obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 9.9 g of a novolak resin (including the polymer of the formula (8-29)).
- the weight average molecular weight measured by GPC in terms of standard polystyrene was 1300.
- the reaction mixture was diluted with 9 g of tetrahydrofuran, and the diluted solution was reprecipitated from methanol / water (80% by mass / 20% by mass). The obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 4.9 g of a novolak resin (including the polymer of the formula (8-19)).
- the weight average molecular weight measured by standard polystyrene conversion from GPC was 2300.
- ⁇ Synthesis Example 12> 5.55-g of 1,5-dihydroxynaphthalene and 8.00 g of 1-pyrenecarboxaldehyde (manufactured by Maruzen Chemical Industry Co., Ltd.) were added and stirred under reflux for 24 hours under a nitrogen atmosphere. After completion of the reaction, the reaction mixture was diluted with 35 g of tetrahydrofuran, and the diluted solution was reprecipitated from methanol. The obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 9.3 g of a novolak resin (including the polymer of the formula (12-1)). The weight average molecular weight measured by GPC in terms of standard polystyrene was 3100.
- the reaction mixture was diluted with 37 g of tetrahydrofuran, and the diluted solution was reprecipitated from a mixed solvent of methanol / water (50% by mass / 50% by mass).
- the obtained precipitate was filtered, washed, and dried under reduced pressure at 60 ° C. to obtain 10.4 g of a novolak resin (including the polymer of the formula (12-2)).
- the weight average molecular weight measured by GPC in terms of standard polystyrene was 3,500.
- Example 1> After dissolving 3.0 g of the polymer obtained in Synthesis Example 1 in 19.2 g of propylene glycol monomethyl ether and 8.2 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 2> After 3.3 g of the polymer obtained in Synthesis Example 2 was dissolved in 20.8 g of propylene glycol monomethyl ether and 8.9 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 3> After dissolving 3.2 g of the polymer obtained in Synthesis Example 3 in 20.1 g of propylene glycol monomethyl ether and 8.6 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 4> After 3.5 g of the polymer obtained in Synthesis Example 4 was dissolved in 22.3 g of propylene glycol monomethyl ether and 9.5 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 5 After 3.2 g of the polymer obtained in Synthesis Example 5 was dissolved in 20.2 g of propylene glycol monomethyl ether and 8.7 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 6 After 3.2 g of the polymer obtained in Synthesis Example 6 was dissolved in 20.0 g of propylene glycol monomethyl ether and 8.6 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 7> After dissolving 2.0 g of the polymer obtained in Synthesis Example 7 in 12.6 g of propylene glycol monomethyl ether and 5.4 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 8> After dissolving 3.0 g of the polymer obtained in Synthesis Example 8 in 18.9 g of propylene glycol monomethyl ether and 8.1 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 9> After dissolving 3.0 g of the polymer obtained in Synthesis Example 9 in 18.9 g of propylene glycol monomethyl ether and 8.1 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 10> After dissolving 3.0 g of the polymer obtained in Synthesis Example 10 in 18.9 g of propylene glycol monomethyl ether and 8.1 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 11 After dissolving 1.4 g of the polymer obtained in Synthesis Example 11 in 13.0 g of propylene glycol monomethyl ether and 5.6 g of propylene glycol monomethyl ether acetate, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film is prepared. Prepared.
- ⁇ Comparative Example 1> After dissolving 2.0 g of the polymer obtained in Synthesis Example 12 in 12.6 g of propylene glycol monomethyl ether and 5.4 g of cyclohexanone, a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- ⁇ Comparative Example 2> After dissolving 2.0 g of the polymer obtained in Synthesis Example 13 in 11.6 g of propylene glycol monomethyl ether and 5.4 g of cyclohexanone, a solution of a resist underlayer film forming composition used in a lithography process using a multilayer film was prepared.
- the resist underlayer film forming composition solutions prepared in Examples 1 to 11, Comparative Example 1 and Comparative Example 2 were each applied onto a silicon oxide-coated silicon wafer by a spin coater.
- a resist underlayer film (film thickness: 200 nm) was formed by baking at 400 ° C. for 2 minutes on a hot plate.
- a silicon hard mask forming composition solution was applied on the resist underlayer film and baked at 240 ° C. for 1 minute to form a silicon hard mask layer (film thickness 45 nm).
- a resist solution was applied thereon and baked at 100 ° C. for 1 minute to form a resist layer (film thickness 120 nm).
- Exposure was performed using a mask at a wavelength of 193 nm, post-exposure heating PEB (1 minute at 105 ° C.) was performed, and development was performed to obtain a resist pattern. Thereafter, dry etching was performed with a fluorine-based gas (component is CF 4 ), and the resist pattern was transferred to a hard mask. Thereafter, dry etching was performed with an oxygen-based gas (component is O 2 / CO 2 ), and the resist pattern was transferred to the resist underlayer film. Thereafter, dry etching was performed with a fluorine-based gas (components: C 4 F 6 / C 4 F 8 / O 2 / Ar), and the silicon oxide film on the silicon wafer was removed.
- a fluorine-based gas component is CF 4
- a length-measuring scanning electron microscope (manufactured by Hitachi, Ltd.) was used for measuring the resolution.
- the resist underlayer film forming composition film remaining on the silicon oxide film was removed, and the processing line width of the silicon oxide film on which the resist pattern was transferred stepwise was measured.
- Table 1 shows the processed line width at which the pattern formed on the silicon oxide film starts to bend. [Table 1]
- the resist underlayer film forming compositions of Examples 1 to 10 have a narrower limit processing line width at which the bending of the pattern formed on the silicon oxide film occurs than Comparative Examples 1 and 2, and are finer. Substrate processing was achieved. That is, it was confirmed that the resist underlayer film forming compositions of Examples 1 to 10 show a useful effect for suppressing pattern wiggling.
- Line and space (pattern width 75 nm, pitch width 340 nm, pattern height 80 nm) was applied to the solutions of the resist underlayer film forming compositions prepared in Examples 1 to 11, Comparative Example 1 and Comparative Example 2 using a spin coater. It was coated to a thickness 90nm to SiO 2 with wafer substrate having, calcined 400 ° C. 2 minutes on a hot plate to form a lower layer film.
- the resist underlayer film material used in the lithography process using the multilayer film of the present invention is different from the conventional high etch rate antireflection film, and the dry etching rate selection ratio close to the photoresist or smaller than the photoresist, the semiconductor It is possible to provide a resist underlayer film that has a lower dry etching rate selection ratio than that of the substrate and can also have an effect as an antireflection film.
- the film was baked at 400 ° C., and it was found that it has a function as a hard mask by comparing the dry etching rate ratio with a conventional phenol novolac resin. . It has been 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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Abstract
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)。
カルバゾールノボラック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8参照)。
多核フェノールノボラック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9)。
第2観点として、フェノールノボラック樹脂が、下記式(1)の単位構造、式(2)の単位構造、式(3)の単位構造、式(4)の単位構造、又はそれら単位構造の組み合わせ:
第3観点として、上記Aが式(6):
第4観点として、上記Aが式(7):
第5観点として、上記C1がアントリル基、又はピレニル基である第2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、更に架橋剤を含む第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7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、
第8観点として、第1観点乃至第7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9観点として、第1観点乃至第7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して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、
第10観点として、半導体基板上に第1観点乃至第7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、
第11観点として、半導体基板に第1観点乃至第7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、及び
第12観点として、ハードマスクが無機物の蒸着によるものである第11観点に記載の製造方法である。
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樹脂と溶剤を含む。そして、必要に応じて架橋剤、酸、酸発生剤、界面活性剤等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。
式(1)、式(2)、式(3)、式(4)中、Aは少なくとも3つのフェノール基を有し且つ該フェノール基は第3級炭素原子に結合した構造を有するか、又は該フェノール基はメチル基が結合した第4級炭素原子に結合した構造を有する有機基であり、B1、B2、B3及びB4はそれぞれ式(5)を示す。
式(5)中、C1はハロゲン基、ニトロ基、アミノ基若しくはヒドロキシ基で置換されていても良い炭素数6乃至40のアリール基又は複素環基を表し、C2は水素原子、又はハロゲン基、ニトロ基、アミノ基、若しくはヒドロキシ基で置換されていても良い炭素数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を表し、そしてC1とC2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。
上記複素環基としては窒素、硫黄、酸素原子を含む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、トリアジン基、トリアジントリオン基等が挙げられる。
アルキル基及びアリール基は上述の基が挙げられる。そして、アルキレン基は上記アルキル基から誘導されるアルキレン基が挙げられる。また、アリーレン基は上記アリール基から誘導されるアリーレン基が挙げられる。
また、本発明のポリマーの製造に用いられるケトン類としてはジアリールケトン類であり、例えばジフェニルケトン、フェニルナフチルケトン、ジナフチルケトン、フェニルトリルケトン、ジトリルケトン、9-フルオレノン等が挙げられる。
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。
この化合物は下記式(9)の部分構造を有する化合物や、下記式(10)の繰り返し単位を有するポリマー又はオリゴマーが挙げられる。
式(9)及び式(10)の化合物、ポリマー、オリゴマーは以下に例示される。
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。
さらに、プロピレングリコールモノブチルエーテル、プロピレングリコールモノブチルエーテルアセテート等の高沸点溶剤を混合して使用することができる。これらの溶剤の中で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、乳酸エチル、乳酸ブチル、及びシクロヘキサノン等がレベリング性の向上に対して好ましい。
本発明におけるリソグラフィー用レジスト下層膜の上部に塗布されるフォトレジストとしてはネガ型、ポジ型いずれも使用でき、ノボラック樹脂と1,2-ナフトキノンジアジドスルホン酸エステルとからなるポジ型フォトレジスト、酸により分解してアルカリ溶解速度を上昇させる基を有するバインダーと光酸発生剤からなる化学増幅型フォトレジスト、アルカリ可溶性バインダーと酸により分解してフォトレジストのアルカリ溶解速度を上昇させる低分子化合物と光酸発生剤からなる化学増幅型フォトレジスト、酸により分解してアルカリ溶解速度を上昇させる基を有するバインダーと酸により分解してフォトレジストのアルカリ溶解速度を上昇させる低分子化合物と光酸発生剤からなる化学増幅型フォトレジスト、骨格にSi原子を有するフォトレジスト等があり、例えば、ロームアンドハース社製、商品名APEX-Eが挙げられる。
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。
1,1,2,2-テトラキス(4-ヒドロキシフェニル)エタン(製品名:TEP-DF、旭有機材工業(株)製)8.65g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)5.00g、メタンスルホン酸0.21gにプロピレングリコールモノメチルエーテル20.79gを加え、窒素雰囲気下、23時間還流撹拌した。反応終了後、テトラヒドロフラン35gで希釈し、希釈液をメタノール/水(50質量%/50質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂9.4gを得た(式(8-1)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は3600であった。
<合成例2>
1,1,2,2-テトラキス(4-ヒドロキシフェニル)エタン(製品名:TEP-DF、旭有機材工業(株)製)6.06g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)7.00g、メタンスルホン酸0.29gにプロピレングリコールモノメチルエーテル20.02gを加え、窒素雰囲気下、23時間還流撹拌した。反応終了後、テトラヒドロフラン20gで希釈し、希釈液をメタノール/水(80質量%/20質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂9.1gを得た(式(8-20)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は4800であった。
<合成例3>
1,1,2,2-テトラキス(4-ヒドロキシフェニル)エタン(製品名:TEP-DF、旭有機材工業(株)製)3.89g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)9.00g、メタンスルホン酸0.38gにプロピレングリコールモノメチルエーテル19.90gを加え、窒素雰囲気下、23時間還流撹拌した。反応終了後、テトラヒドロフラン20gで希釈し、希釈液をメタノール/水(80質量%/20質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂11.2gを得た(式(8-22)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は5700であった。
<合成例4>
α,α,α’,α’-テトラキス(4-ヒドロキシフェニル)-p-キシレン(製品名:TEP-TPA、旭有機材工業(株)製)10.30g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)5.00g、メタンスルホン酸0.21gにプロピレングリコールモノメチルエーテル23.27gを加え、窒素雰囲気下、23時間還流撹拌した。反応終了後、テトラヒドロフラン39gで希釈し、希釈液をメタノール/水(50質量%/50質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂10.0gを得た(式(8-5)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は4900であった。
<合成例5>
α,α,α’,α’-テトラキス(4-ヒドロキシフェニル)-p-キシレン(製品名:TEP-TPA、旭有機材工業(株)製)7.21g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)7.00g、メタンスルホン酸0.29gにプロピレングリコールモノメチルエーテル23.27gを加え、窒素雰囲気下、23時間還流撹拌した。反応終了後、テトラヒドロフラン22gで希釈し、希釈液をメタノール/水(80質量%/20質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂10.2gを得た(式(8-26)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は7900であった。
α,α,α’,α’-テトラキス(4-ヒドロキシフェニル)-p-キシレン(製品名:TEP-TPA、旭有機材工業(株)製)4.64g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)9.00g、メタンスルホン酸0.38gにプロピレングリコールモノメチルエーテル21.02gを加え、窒素雰囲気下、23時間還流撹拌した。反応終了後、テトラヒドロフラン21gで希釈し、希釈液をメタノール/水(80質量%/20質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂10.9gを得た(式(8-28)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は7400であった。
<合成例7>
1,1,2,2-テトラキス(3-メチル-4-ヒドロキシフェニル)エタン(製品名:TEOC-DF、旭有機材工業(株)製)9.87g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)5.00g、メタンスルホン酸0.21gにプロピレングリコールモノメチルエーテル22.62gを加え、窒素雰囲気下、23時間還流撹拌した。反応終了後、テトラヒドロフラン38gで希釈し、希釈液をメタノール/水(50質量%/50質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂6.9gを得た(式(8-2)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は1700であった。
<合成例8>
1,1,2,2-テトラキス(3-メチル-4-ヒドロキシフェニル)エタン(製品名:TEOC-DF、旭有機材工業(株)製)4.69g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)9.50g、メタンスルホン酸0.40gにプロピレングリコールモノメチルエーテル21.88gを加え、窒素雰囲気下、23時間還流撹拌した。反応終了後、テトラヒドロフラン36gで希釈し、希釈液をメタノール/水(70質量%/30質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂11.5gを得た(式(8-25)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は2000であった。
<合成例9>
1,1,2,2-テトラキス(4-ヒドロキシフェニル)エタン(製品名:TEP-DF、旭有機材工業(株)製)4.35g、9-アントリルアルデヒド9.00g、メタンスルホン酸0.42gにプロピレングリコールモノメチルエーテル20.65gを加え、窒素雰囲気下、24時間還流撹拌した。反応終了後、溶液をメタノール/水(60質量%/40質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂9.9gを得た(式(8-29)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は1300であった。
<合成例10>
トリス(4-ヒドロキシフェニル)メタン9.00g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)21.28g、メタンスルホン酸0.89gにプロピレングリコールモノメチルエーテル57.89gを加え、窒素雰囲気下、25時間還流撹拌した。反応終了後、テトラヒドロフラン63gで希釈し、希釈液をメタノール中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂20.1gを得た(式(8-18)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は3200であった。
<合成例11>
トリス(4-ヒドロキシフェニル)エタン5.99g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)4.50g、メタンスルホン酸0.19gにプロピレングリコールモノメチルエーテル16.01gを加え、窒素雰囲気下、14時間還流撹拌した。反応終了後、テトラヒドロフラン9gで希釈し、希釈液をメタノール/水(80質量%/20質量%)中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂4.9gを得た(式(8-19)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は2300であった。
1,5-ジヒドロキシナフタレン5.56g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)8.00gを加え、窒素雰囲気下、24時間還流撹拌した。反応終了後、テトラヒドロフラン35gで希釈し、希釈液をメタノール中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂9.3gを得た(式(12-1)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は3100であった。
2,2-ビス[4,4-ビス(4-ヒドロキシフェニル)シクロヘキシル]プロパン(製品名:TEP-BOCP、旭有機材工業(株)製)8.14g、1-ピレンカルボキシアルデヒド(丸善化学工業(株)製)6.50g、メタンスルホン酸0.27gにプロピレングリコールモノメチルエーテル22.37gを加え、窒素雰囲気下、23時間還流撹拌した。反応終了後、テトラヒドロフラン37gで希釈し、希釈液をメタノール/水(50質量%/50質量%)の混合溶媒中より再沈殿させた。得られた沈殿物をろ過、洗浄し、60℃で減圧乾燥することで、ノボラック樹脂10.4gを得た(式(12-2)のポリマーを含む)。GPCより標準ポリスチレン換算で測定される重量平均分子量は3500であった。
合成例1で得た3.0gのポリマーをプロピレングリコールモノメチルエーテル19.2g、シクロヘキサノン8.2gに溶解させた後、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2>
合成例2で得た3.3gのポリマーをプロピレングリコールモノメチルエーテル20.8g、シクロヘキサノン8.9gに溶解させた後、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3>
合成例3で得た3.2gのポリマーをプロピレングリコールモノメチルエーテル20.1g、シクロヘキサノン8.6gに溶解させた後、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4>
合成例4で得た3.5gのポリマーをプロピレングリコールモノメチルエーテル22.3g、シクロヘキサノン9.5gに溶解させた後、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5>
合成例5で得た3.2gのポリマーをプロピレングリコールモノメチルエーテル20.2g、シクロヘキサノン8.7gに溶解させた後、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6>
合成例6で得た3.2gのポリマーをプロピレングリコールモノメチルエーテル20.0g、シクロヘキサノン8.6gに溶解させた後、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7>
合成例7で得た2.0gのポリマーをプロピレングリコールモノメチルエーテル12.6g、シクロヘキサノン5.4gに溶解させた後、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8>
合成例8で得た3.0gのポリマーをプロピレングリコールモノメチルエーテル18.9g、シクロヘキサノン8.1gに溶解させた後、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9>
合成例9で得た3.0gのポリマーをプロピレングリコールモノメチルエーテル18.9g、シクロヘキサノン8.1gに溶解させた後、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10>
合成例10で得た3.0gのポリマーをプロピレングリコールモノメチルエーテル18.9g、シクロヘキサノン8.1gに溶解させた後、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11>
合成例11で得た1.4gのポリマーをプロピレングリコールモノメチルエーテル13.0g、プロピレングリコールモノメチルエーテルアセテート5.6gに溶解させた後、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12で得た2.0gのポリマーをプロピレングリコールモノメチルエーテル12.6g、シクロヘキサノン5.4gに溶解させた後、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。
<比較例2>
合成例13で得た2.0gのポリマーをプロピレングリコールモノメチルエーテル11.6g、シクロヘキサノン5.4gに溶解させた後、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乃至実施例11、比較例1及び比較例2で調製した各レジスト下層膜形成組成物の溶液をスピンコーターにてそれぞれ酸化ケイ素被膜付きシリコンウエハー上に塗布した。ホットプレート上で400℃2分間焼成しレジスト下層膜(膜厚200nm)を形成した。レジスト下層膜上にシリコンハードマスク形成組成物溶液を塗布し、240℃で1分間焼成しシリコンハードマスク層(膜厚45nm)を形成した。その上にレジスト溶液を塗布し、100℃で1分間焼成しレジスト層(膜厚120nm)を形成した。マスクを用いて波長193nmで露光し、露光後加熱PEB(105℃で1分間)を行った後、現像してレジストパターンを得た。その後、フッ素系ガス(成分はCF4)でドライエッチングを行い、レジストパターンをハードマスクに転写した。その後、酸素系ガス(成分はO2/CO2)でドライエッチングを行い、レジストパターンを本件レジスト下層膜に転写した。その後、フッ素系ガス(成分はC4F6/C4F8/O2/Ar)でドライエッチングを行い、シリコンウエハー上の酸化ケイ素被膜の除去を行った。その後、酸素系ガス(成分はO2/N2)でドライエッチングを行い、酸化ケイ素被膜上に残存したレジスト下層膜形成組成物を除去した。各工程時のそれぞれのパターン形状を電子顕微鏡で観察した。パターン幅が狭まるにしたがいウイグリング(wiggling)という不規則なパターンの曲がりが発生しやすくなるが、上記の実施例のレジスト下層膜形成組成物を用いて上述工程を行いパターンの曲がり(wiggling)を生じ始めるパターン幅を電子顕微鏡で観測した。パターンの曲がりが発生することで忠実なパターンに基づく基板加工ができなくなるため、パターンの曲がりが発生する直前のパターン幅(限界加工線幅幅)により基板加工をする必要がある。パターンの曲がりが発生し始めるパターン幅は、その値が細ければ細いほど微細な基板の加工が可能となる。解像度の測定には測長走査型電子顕微鏡(日立製作所製)を用いた。酸化ケイ素被膜上に残存したレジスト下層膜形成組成膜を除去し、レジストパターンが段階的に転写された酸化ケイ素被膜の加工線幅を測定した。この時の酸化ケイ素被膜に形成されたパターンが曲がり始める加工線幅を表1に示す。
〔表1〕
実施例1乃至実施例11、比較例1及び比較例2で調製した各レジスト下層膜形成組成物の溶液を一般的なレジスト溶剤である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)、シクロヘキサノン(CYH)中に滴下し、レジスト下層膜形成組成物中のポリマー(ノボラック樹脂成分)の沈殿物が析出するか否かについて観察した。析出が観察されなかった場合は、ノボラック樹脂の溶解性を「良好」とし、析出が観察された場合は、ノボラック樹脂の溶解性を「不良」とした。このノボラック樹脂溶液の溶解性試験の結果を表2に示す。
〔表2〕
以上の結果より、実施例1乃至11のレジスト下層膜形成組成物は、比較例1よりもレジスト溶剤への溶解性が高いことが確認された。
実施例1乃至実施例11、比較例1及び比較例2で調製した各レジスト下層膜形成組成物の溶液をスピンコーターにより、ラインアンドスペース(パターン幅75nm、ピッチ幅340nm、パターン高さ80nm)を有するSiO2付きウエハー基板上に膜厚90nmとなるように塗布し、ホットプレート上で400℃2分間焼成し、下層膜を形成した。走査型電子顕微鏡(SEM)を用いて、実施例1乃至実施例11、比較例1及び比較例2で得たリソグラフィー用下層膜形成組成物を塗布したラインアンドスペースを有するSiO2付きウエハー基板の断面形状を観察し、下層膜によるラインアンドスペースパターンに対する平坦化性を評価した。下層膜がラインアンドスペースパターンに対して凹凸なく塗布された場合を「良好」とし、わずかな凹凸が観察される場合を「やや不良」とし、凹凸が観察される場合を「不良」とした。この平坦化性試験の結果を表3に示す。
〔表3〕
実施例1乃至実施例11、比較例1及び比較例2で調製した各レジスト下層膜形成組成物の溶液をスピンコーターにより、ホールパターン(ホール径120nm、ピッチ幅240nm、深さ400nm)を有するSiO2付きウエハー基板上に膜厚200nmとなるように塗布し、ホットプレート上で400℃2分間焼成し、下層膜を形成した。走査型電子顕微鏡(SEM)を用いて、実施例1乃至実施例10、比較例1及び比較例2で得たリソグラフィー用下層膜形成組成物を塗布したホールパターンを有するSiO2付きウエハー基板の断面形状を観察し、下層膜によるホールパターンに対する下層膜の埋め込み性を評価した。下層膜がホールパターンに対してボイドなく埋め込まれた場合を「良好」とし、ホールパターン内でボイドが発生した場合を「不良」とした。この埋込性試験の結果を表4に示す。
〔表4〕
以上の結果より、実施例1乃至11のレジスト下層膜形成組成物は、比較例1よりも埋め込み性に優れていることが確認された。
本発明の下層膜材料は上層に蒸着でハードマスクを形成可能な耐熱性を有することが判った。
Claims (12)
- 少なくとも3つのフェノール基を有し且つ該フェノール基は第3級炭素原子に結合した構造を有するか、又は該フェノール基はメチル基が結合した第4級炭素原子に結合した構造を有する化合物と、芳香族アルデヒド又は芳香族ケトンとを酸性触媒の存在下に反応させて得られるフェノールノボラック樹脂を含むレジスト下層膜形成組成物。
- フェノールノボラック樹脂が、下記式(1)の単位構造、式(2)の単位構造、式(3)の単位構造、式(4)の単位構造、又はそれら単位構造の組み合わせ:
〔式(1)、式(2)、式(3)、式(4)中、Aは少なくとも3つのフェノール基を有し該フェノール基は第3級炭素原子に結合した構造を有する有機基であり、B1、B2、B3及びB4はそれぞれ式(5):
(式(5)中、C1はハロゲン基、ニトロ基、アミノ基若しくはヒドロキシ基で置換されていても良い炭素数6乃至40のアリール基又は複素環基を表し、C2は水素原子、又はハロゲン基、ニトロ基、アミノ基、若しくはヒドロキシ基で置換されていても良い炭素数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を表し、そしてC1とC2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。)を示す。〕を含む請求項1に記載のレジスト下層膜形成組成物。 - 上記C1がアントリル基、又はピレニル基である請求項2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。
- 更に架橋剤を含む請求項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。
- 更に酸及び/又は酸発生剤を含む請求項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。
- 請求項1乃至請求項7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1乃至請求項7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1乃至請求項7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7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。
- ハードマスクが無機物の蒸着によるものである請求項11に記載の製造方法。
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TW201420667A (zh) | 2014-06-01 |
CN104541205A (zh) | 2015-04-22 |
CN104541205B (zh) | 2019-07-05 |
US9469777B2 (en) | 2016-10-18 |
KR102076528B1 (ko) | 2020-02-13 |
JP6124025B2 (ja) | 2017-05-10 |
US20150184018A1 (en) | 2015-07-02 |
JPWO2014030579A1 (ja) | 2016-07-28 |
KR20150045998A (ko) | 2015-04-29 |
TWI588201B (zh) | 2017-06-21 |
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