WO2013051558A1 - ケイ素含有euvレジスト下層膜形成組成物 - Google Patents
ケイ素含有euvレジスト下層膜形成組成物 Download PDFInfo
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- WO2013051558A1 WO2013051558A1 PCT/JP2012/075507 JP2012075507W WO2013051558A1 WO 2013051558 A1 WO2013051558 A1 WO 2013051558A1 JP 2012075507 W JP2012075507 W JP 2012075507W WO 2013051558 A1 WO2013051558 A1 WO 2013051558A1
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- WLOQLWBIJZDHET-UHFFFAOYSA-N triphenylsulfonium Chemical compound C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 WLOQLWBIJZDHET-UHFFFAOYSA-N 0.000 description 1
- 239000012953 triphenylsulfonium Substances 0.000 description 1
- FAYMLNNRGCYLSR-UHFFFAOYSA-M triphenylsulfonium triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 FAYMLNNRGCYLSR-UHFFFAOYSA-M 0.000 description 1
- XMUJIPOFTAHSOK-UHFFFAOYSA-N undecan-2-ol Chemical compound CCCCCCCCCC(C)O XMUJIPOFTAHSOK-UHFFFAOYSA-N 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
Classifications
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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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
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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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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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
- G03F7/075—Silicon-containing compounds
- G03F7/0752—Silicon-containing compounds in non photosensitive layers or as additives, e.g. for dry lithography
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/38—Treatment before imagewise removal, e.g. prebaking
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/40—Treatment after imagewise removal, e.g. baking
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02126—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
- H01L21/02137—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material comprising alkyl silsesquioxane, e.g. MSQ
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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
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3081—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
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- 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/24—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen halogen-containing groups
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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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/26—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen nitrogen-containing groups
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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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/80—Siloxanes having aromatic substituents, e.g. phenyl side groups
Definitions
- the present invention relates to a composition for forming a lower layer film between a substrate used for manufacturing a semiconductor device and a resist (for example, EUV resist). More specifically, the present invention relates to a resist underlayer film forming composition for lithography for forming an underlayer film used as a lower layer of a resist in a lithography process of manufacturing a semiconductor device. The present invention also relates to a method for forming a resist pattern using the underlayer film forming composition.
- microfabrication is obtained by forming a thin film of photoresist on a semiconductor substrate such as a silicon wafer, irradiating it with an actinic ray such as ultraviolet rays through a mask pattern on which a semiconductor device pattern is drawn, and developing it.
- actinic ray such as ultraviolet rays
- fine irregularities corresponding to the pattern are formed on the substrate surface by etching the substrate using the photoresist pattern as a protective film.
- a film known as a hard mask containing a metal element such as silicon is used as a lower layer film between the semiconductor substrate and the photoresist.
- the removal rate by dry etching largely depends on the gas type used for dry etching.
- the gas type it is possible to remove the hard mask by dry etching without a significant decrease in the thickness of the photoresist.
- a resist underlayer film has been arranged between a semiconductor substrate and a photoresist (see Patent Documents 1 and 2). ).
- An object of the present invention is to provide a resist underlayer film forming composition for EUV lithography which can be used for manufacturing a semiconductor device, which enables fine substrate processing using a rectangular resist pattern.
- an object of the present invention is to provide a resist underlayer film forming composition for lithography for forming a resist underlayer film that can be used as a hard mask.
- Another object of the present invention is to improve the exposure sensitivity of an EUV resist, to prevent intermixing with the resist, to have a large dry etching rate compared to the resist, and to generate less outgas during exposure with EUV light.
- An object of the present invention is to provide an underlayer film and a resist underlayer film forming composition for forming the underlayer film.
- the present invention includes, as a first aspect, hydrolyzable silane, a hydrolyzate thereof, a hydrolyzate condensate thereof, or a mixture thereof as silane, wherein the hydrolyzable silane is tetramethoxysilane, alkyltrimethoxysilane, and aryl.
- the aryltrialkoxysilane has the following formula (1): (In the formula (1), R 1 represents an aromatic ring composed of a benzene ring or a naphthalene ring or a ring containing an isocyanuric acid structure, and R 2 is a substituent of a hydrogen atom in the aromatic ring, a halogen atom, Or an alkoxy group having 1 to 10 carbon atoms, X is an alkoxy group having 1 to 10 carbon atoms, an acyloxy group having 2 to 10 carbon atoms, or a halogen group, and n1 is an integer of 0 or 1.
- N2 is an integer of 1 to 5 in the case of a benzene ring, and an integer of 1 to 9 in the case of a naphthalene ring)), a resist underlayer film forming composition for EUV lithography
- the resist underlayer film forming composition according to the first aspect wherein R 1 in formula (1) is a benzene ring
- R 2 is methoxy group of the formula (1), methoxymethoxy group, a fluorine atom, a chlorine atom, or a resist underlayer film forming composition according to the first aspect or the second aspect is a bromine atom
- the resist underlayer film forming composition according to any one of the first to fourth aspects wherein n1 in formula (1) is 0,
- the resist underlayer film forming composition according to the first aspect wherein n1 in formula (1) is 0,
- a step of applying a resist composition on the resist underlayer film to form a resist film, a step of exposing the resist film, a step of developing the resist film after exposure to obtain a resist pattern, and the resist pattern A method of manufacturing a semiconductor device, comprising: etching a resist underlayer film; etching the organic underlayer film with the patterned resist underlayer film; and processing the semiconductor substrate with the patterned organic underlayer film It is.
- a resist underlayer film formed from the composition by EUV lithography can be used as a hard mask having dry etching resistance against an oxygen-based dry etching gas, and facilitates fine processing of a substrate.
- the resist underlayer film formed from the composition can improve the exposure sensitivity of the EUV resist provided on the underlayer film.
- a resist underlayer film for lithography having a large dry etching rate compared to the resist can be formed without generating outgas during exposure with EUV light, causing no intermixing with the resist.
- the application of the composition makes it possible to manufacture a semiconductor device using a resist underlayer film having such good performance.
- a resist underlayer film is formed on a substrate by a coating method, or a resist underlayer film is formed thereon by an organic underlayer film on a substrate, and a resist film (for example, , EUV resist). Then, a resist pattern is formed by exposure and development, and the resist underlayer film is dry-etched using the resist pattern to transfer the pattern, and the substrate is processed by the pattern, or the organic underlayer film is etched by pattern transfer. Then, the substrate is processed with the organic underlayer film.
- a resist pattern is formed by exposure and development, and the resist underlayer film is dry-etched using the resist pattern to transfer the pattern, and the substrate is processed by the pattern, or the organic underlayer film is etched by pattern transfer.
- the resist film thickness tends to be thin to prevent pattern collapse.
- the resist underlayer film (containing an inorganic silicon compound) is coated on the substrate with or without an organic underlayer film on the substrate, and a resist film (organic resist film) is formed thereon. It is coated in the order of.
- the organic component film and the inorganic component film differ greatly in the dry etching rate depending on the selection of the etching gas.
- the organic component film has an oxygen-based gas and the dry etching rate increases.
- the inorganic component film has a halogen-containing gas. This increases the dry etching rate.
- a resist pattern is formed, and the resist underlayer film of the present application existing under the resist pattern is dry-etched with a halogen-containing gas to transfer the pattern to the resist underlayer film, and the halogen-containing gas is transferred with the pattern transferred to the resist underlayer film.
- the organic underlayer film under the layer is dry-etched with an oxygen-based gas to transfer the pattern to the organic underlayer film, and the pattern-transferred organic underlayer film is halogen-containing.
- Substrate processing is performed using gas.
- the resist underlayer film functions as a hard mask, and a hydrolyzable group such as an alkoxy group, an acyloxy group, or a halogen group in the structure is hydrolyzed or partially hydrolyzed, and then a condensation reaction of a silanol group is performed.
- a polymer having a polysiloxane structure This polyorganosiloxane structure has a sufficient function as a hard mask.
- the polyorganosiloxane structure (intermediate film) is effective as a hard mask for etching the underlying organic underlayer film and processing (etching) the substrate. That is, it has sufficient dry etching resistance against oxygen dry etching gas of the organic underlayer film during substrate processing.
- the alkoxyaryl group of the aryltrialkoxysilane in the silane compound used in the present invention and the halogenated aryl group can reduce the exposure amount of irradiated EUV when the EUV resist existing in the upper layer is exposed with EUV light. Yes, that is, a pattern can be formed with a low exposure amount.
- the hydrolyzable group in the silane compound used in the present invention is preferably a methoxy group.
- the silane compound is hydrolyzed, and the hydrolyzed condensate (polysiloxane) is used in the resist underlayer film forming composition, but it may exist partially in the form of silanol groups or alkoxy groups without being completely hydrolyzed. .
- the alkoxy group in the lower layer film may remain in the film in a subsequent processing step. At the time of EUV exposure, this residual alkoxy group or its component may become outgas and adhere to the mirror of the exposure machine, which may cause contamination or failure of the exposure machine.
- the present invention has been able to solve these problems by using a hydrolyzable group mainly composed of methoxy groups, rather than mainly composed of ethoxy groups.
- the present invention includes a hydrolyzable silane, a hydrolyzate thereof, a hydrolyzate condensate thereof, or a mixture thereof as the silane, and the hydrolyzable silane includes tetramethoxysilane, alkyltrimethoxysilane, and aryltrialkoxysilane.
- the aryltrialkoxysilane relates to a resist underlayer film forming composition for EUV lithography, which is the above formula (1).
- the resist underlayer film forming composition of the present invention contains the hydrolyzable silane, its hydrolyzate, its hydrolyzed condensate, or a mixture thereof, and further contains a solvent.
- a solvent for optional components, acid, water, alcohol, curing catalyst, acid generator, other organic polymer, light-absorbing compound, surfactant and the like can be included.
- the solid content in the resist underlayer film forming composition of the present invention is, for example, 0.1 to 50% by mass, or 0.1 to 30% by mass, and 0.1 to 25% by mass.
- the solid content is obtained by removing the solvent component from all the components of the resist underlayer film forming composition.
- the ratio of the hydrolyzable silane, its hydrolyzate, and its hydrolysis condensate in the solid content is 20% by mass or more, for example, 50 to 100% by mass, or 60 to 100% by mass, or 70 to 99%. 0.5% by mass.
- R 1 represents an aromatic ring composed of a benzene ring or a naphthalene ring or a ring containing an isocyanuric acid structure
- R 2 is a substituent of a hydrogen atom of the aromatic ring and is a halogen atom or carbon
- X is an alkoxy group having 1 to 10 atoms
- X is an alkoxy group having 1 to 10 carbon atoms, an acyloxy group having 2 to 10 carbon atoms, or a halogen group.
- n1 is an integer of 0 or 1
- n2 is an integer of 1 to 5. When n1 is 1, the silicon atom and the aromatic ring are connected by a methylene group, and when n1 is 0, the silicon atom and the aromatic ring are directly bonded.
- the halogen atom of R 2 in the formula (1) is a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom.
- Examples of the alkoxy group represented by R 2 in the formula (1) include alkoxy groups having a linear, branched or cyclic alkyl moiety having 1 to 10 carbon atoms, such as a methoxy group, an ethoxy group, an n-propoxy group, and an i-propoxy group.
- an alkoxy group of R 2 of formula (1) are also included alkoxyalkoxy group.
- methoxymethoxy group, ethoxyethoxy group, methoxyethoxy group, ethoxymethoxy group and the like can be mentioned.
- a methoxy group and a methoxymethoxy group can be preferably used.
- alkoxy group having 1 to 10 carbon atoms of X in the formula (1) examples include an alkoxy group having a linear, branched or cyclic alkyl moiety having 1 to 10 carbon atoms, such as methoxy group, ethoxy group, n- Propoxy group, i-propoxy group, n-butoxy group, i-butoxy group, s-butoxy group, t-butoxy group, n-pentyloxy group, 1-methyl-n-butoxy group, 2-methyl-n-butoxy group 3-methyl-n-butoxy group, 1,1-dimethyl-n-propoxy group, 1,2-dimethyl-n-propoxy group, 2,2-dimethyl-n-propoxy group, 1-ethyl-n-propoxy group Group, n-hexyloxy group, 1-methyl-n-pentyloxy group, 2-methyl-n-pentyloxy group, 3-methyl-n-pentyloxy group, 4-methyl-n-pentyloxy group, 1,1
- the acyloxy group having 2 to 10 carbon atoms of X in the formula (1) is, for example, a methylcarbonyloxy group, an ethylcarbonyloxy group, an n-propylcarbonyloxy group, an i-propylcarbonyloxy group, an n-butylcarbonyloxy group, i -Butylcarbonyloxy group, s-butylcarbonyloxy group, t-butylcarbonyloxy group, n-pentylcarbonyloxy group, 1-methyl-n-butylcarbonyloxy group, 2-methyl-n-butylcarbonyloxy group, 3 -Methyl-n-butylcarbonyloxy group, 1,1-dimethyl-n-propylcarbonyloxy group, 1,2-dimethyl-n-propylcarbonyloxy group, 2,2-dimethyl-n-propylcarbonyloxy group, -Ethyl-n-propylcarbonyloxy group,
- halogen group X in the formula (1) examples include fluorine, chlorine, bromine and iodine.
- R 1 when R 1 is a benzene ring, when R 2 is a methoxy group, a methoxymethoxy group, a fluorine atom, a chlorine atom, or a bromine atom, when X is a methoxy group, the integer of n1 is 0. It can be preferably used.
- hydrolyzable silane of the formula (1) examples are as follows.
- the alkyl group of the alkyltrimethoxysilane is a linear or branched alkyl group having 1 to 10 carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, an i-propyl group, or an n-butyl group.
- a cyclic alkyl group can also be used.
- a cyclic alkyl group having 1 to 10 carbon atoms includes a cyclopropyl group, a cyclobutyl group, a 1-methyl-cyclopropyl group, a 2-methyl-cyclopropyl group, a cyclopentyl group, 1-methyl-cyclobutyl group, 2-methyl-cyclobutyl group, 3-methyl-cyclobutyl group, 1,2-dimethyl-cyclopropyl group, 2,3-dimethyl-cyclopropyl group, 1-ethyl-cyclopropyl group, 2 -Ethyl-cyclopropyl group, cyclohexyl group, 1-methyl-cyclopentyl group, 2-methyl-cyclopentyl group, 3-methyl-cyclopentyl group, 1-ethyl-cyclobutyl group, 2-ethyl-cyclobutyl group, 3-ethyl-cyclobutyl Group, 1,2-di
- a methyl group is preferably used, and the alkyltrimethoxysilane is preferably methyltrimethoxysilane.
- the hydrolyzable silane can be preferably used when alkyltrimethoxysilane is contained in an amount of 10 to 35 mol and aryltrialkoxysilane in an amount of 2 to 25 mol with respect to 70 mol of tetramethoxysilane.
- hydrolysis condensate (polyorganosilane) of hydrolyzable silane can be exemplified below.
- a hydrolyzable silane hydrolysis condensate (polyorganosiloxane) can be obtained as a condensate having a weight average molecular weight of 1,000 to 1,000,000, or 1,000 to 100,000. These molecular weights are molecular weights obtained in terms of polystyrene by GPC analysis.
- GPC measurement conditions are, for example, GPC apparatus (trade name HLC-8220GPC, manufactured by Tosoh Corporation), GPC column (trade names Shodex KF803L, KF802, KF801, Showa Denko), column temperature is 40 ° C., eluent (elution solvent) Is tetrahydrofuran, the flow rate (flow rate) is 1.0 ml / min, and the standard sample is polystyrene (manufactured by Showa Denko KK).
- the alkoxysilyl group, acyloxysilyl group, or halogenated silyl group is a hydrolyzable group, and the hydrolysis of the hydrolyzable group is preferably 0.5 to 100 moles per mole of the hydrolyzable group, preferably 1 to 10 moles of water are used. Further, 0.001 to 10 mol, preferably 0.001 to 1 mol of hydrolysis catalyst can be used per mol of the hydrolyzable group.
- the reaction temperature during the hydrolysis and condensation is usually 20 to 90 ° C.
- the hydrolysis may be complete hydrolysis or partial hydrolysis. That is, a hydrolyzate or a monomer may remain in the hydrolysis condensate.
- a catalyst can be used in the hydrolysis and condensation. Examples of the hydrolysis catalyst include metal chelate compounds, organic acids, inorganic acids, organic bases, and inorganic bases.
- Examples of the metal chelate compound as the hydrolysis catalyst include triethoxy mono (acetylacetonato) titanium, tri-n-propoxy mono (acetylacetonato) titanium, tri-i-propoxy mono (acetylacetonato) titanium, tri -N-Butoxy mono (acetylacetonato) titanium, tri-sec-butoxy mono (acetylacetonato) titanium, tri-t-butoxy mono (acetylacetonato) titanium, diethoxy bis (acetylacetonato) titanium , Di-n-propoxy bis (acetylacetonato) titanium, di-i-propoxy bis (acetylacetonato) titanium, di-n-butoxy bis (acetylacetonato) titanium, di-sec-butoxy bis (Acetylacetonate) titanium, di-t Butoxy bis (acetylacetonato) titanium, monoethoxy tris (acetylacetonato) titanium
- Organic acids as hydrolysis catalysts include, for example, acetic acid, propionic acid, butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, oxalic acid, maleic acid, methylmalonic acid, adipic acid, sebacin Acid, gallic acid, butyric acid, meritic acid, arachidonic acid, mikimic acid, 2-ethylhexanoic acid, oleic acid, stearic acid, linoleic acid, linolenic acid, salicylic acid, benzoic acid, p-aminobenzoic acid, p-toluenesulfonic acid Benzenesulfonic acid, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, trifluoroacetic acid, formic acid, malonic acid, sulfonic acid
- Examples of the inorganic acid as the hydrolysis catalyst include hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, phosphoric acid and the like.
- Organic bases as hydrolysis catalysts include, for example, pyridine, pyrrole, piperazine, pyrrolidine, piperidine, picoline, trimethylamine, triethylamine, monoethanolamine, diethanolamine, dimethylmonoethanolamine, monomethyldiethanolamine, triethanolamine, diazabicyclooctane, diazine.
- Examples include zabicyclononane, diazabicycloundecene, and tetramethylammonium hydroxide.
- the inorganic base include ammonia, sodium hydroxide, potassium hydroxide, barium hydroxide, calcium hydroxide and the like. Of these catalysts, metal chelate compounds, organic acids, and inorganic acids are preferred, and these may be used alone or in combination of two or more.
- organic solvent used in the hydrolysis examples include n-pentane, i-pentane, n-hexane, i-hexane, n-heptane, i-heptane, 2,2,4-trimethylpentane, n-octane, i- Aliphatic hydrocarbon solvents such as octane, cyclohexane and methylcyclohexane; benzene, toluene, xylene, ethylbenzene, trimethylbenzene, methylethylbenzene, n-propyl benzene, i-propyl benzene, diethylbenzene, i-butylbenzene, triethylbenzene, di Aromatic hydrocarbon solvents such as i-propyl benzene and n-amyl naphthalene; methanol, ethanol, n-propanol, i
- solvents can be used alone or in combination of two or more.
- acetone methyl ethyl ketone, methyl-n-propyl ketone, methyl-n-butyl ketone, diethyl ketone, methyl-i-butyl ketone, methyl-n-pentyl ketone, ethyl-n-butyl ketone, methyl-n-hexyl ketone, di- Ketone solvents such as i-butyl ketone, trimethylnonanone, cyclohexanone, methylcyclohexanone, 2,4-pentanedione, acetonylacetone, diacetone alcohol, acetophenone, fenchon (1,1,3-trimethyl-2-norbornene) Is preferable from the viewpoint of storage stability of the solution.
- Hydrolyzable organosilane is hydrolyzed and condensed using a catalyst in a solvent, and the resulting hydrolyzed condensate (polymer) simultaneously removes by-product alcohol, used hydrolysis catalyst and water by distillation under reduced pressure. can do.
- the acid and base catalyst used for hydrolysis can be removed by neutralization or ion exchange.
- the resist underlayer film forming composition for lithography of the present invention the resist underlayer film forming composition containing the hydrolysis condensate is added with an acid (for example, an organic acid), water, alcohol, or a combination thereof for stabilization. can do.
- organic acid examples include oxalic acid, malonic acid, methylmalonic acid, succinic acid, maleic acid, malic acid, tartaric acid, phthalic acid, citric acid, glutaric acid, citric acid, lactic acid, and salicylic acid. Of these, oxalic acid and maleic acid are preferred.
- the organic acid to be added is 0.5 to 5.0 parts by mass with respect to 100 parts by mass of the condensate (polyorganosiloxane).
- pure water, ultrapure water, ion exchange water, etc. can be used for the water to add, and the addition amount can be 1-20 mass parts with respect to 100 mass parts of resist underlayer film forming compositions.
- the alcohol to be added is preferably one that is easily scattered by heating after coating, and examples thereof include methanol, ethanol, propanol, isopropanol, and butanol.
- the added alcohol can be 1 to 20 parts by mass with respect to 100 parts by mass of the resist underlayer film forming composition.
- a crosslinkable compound can be contained.
- cross-linkable compounds having at least two cross-linking substituents are preferably used.
- examples thereof include melamine compounds and substituted urea compounds having a cross-linking substituent such as a methylol group or a methoxymethyl group.
- it is a compound such as methoxymethylated glycoluril or methoxymethylated melamine, for example, tetramethoxymethylglycoluril, tetrabutoxymethylglycoluril, or hexamethoxymethylmelamine.
- compounds such as tetramethoxymethylurea and tetrabutoxymethylurea are also included.
- the solid content is, for example, 50% by mass or less, 0.01 to 50% by mass, or 10 to 40% by mass.
- the resist underlayer film forming composition of the present invention can contain an acid compound.
- the acid compound include sulfonic acid compounds such as p-toluenesulfonic acid, trifluoromethanesulfonic acid, and pyridinium-p-toluenesulfonate, and carboxylic acids such as salicylic acid, sulfosalicylic acid, citric acid, benzoic acid, and hydroxybenzoic acid.
- sulfonic acid compounds such as p-toluenesulfonic acid, trifluoromethanesulfonic acid, and pyridinium-p-toluenesulfonate
- carboxylic acids such as salicylic acid, sulfosalicylic acid, citric acid, benzoic acid, and hydroxybenzoic acid.
- a compound can be mentioned.
- Examples of the acid compound include 2,4,4,6-tetrabromocyclohexadienone, benzoin tosylate, 2-nitrobenzyl tosylate, p-trifluoromethylbenzenesulfonic acid-2,4-dinitrobenzyl,
- Examples include acid generators that generate an acid by heat or light, such as phenyl-bis (trichloromethyl) -s-triazine and N-hydroxysuccinimide trifluoromethanesulfonate.
- the acid compound examples include iodonium salt acid generators such as diphenyliodonium hexafluorophosphate, diphenyliodonium trifluoromethanesulfonate, and bis (4-tert-butylphenyl) iodonium trifluoromethanesulfonate, and triphenylsulfonium hexafluoroantimony And sulfonium salt acid generators such as triphenylsulfonium trifluoromethanesulfonate.
- a sulfonic acid compound, an iodonium salt acid generator, and a sulfonium salt acid generator are preferably used.
- An acid compound may use only 1 type and can be used in combination of 2 or more type.
- the content of the acid compound is, for example, 0.1 to 10% by mass or 0.1 to 5% by mass in the solid content.
- the resist underlayer film forming composition of the present invention can contain a curing catalyst.
- the curing catalyst functions as a curing catalyst when a coating film containing polyorganosiloxane composed of a hydrolysis condensate is heated and cured.
- an ammonium compound, a cyclic ammonium compound, a cyclic amine compound, or an onium compound can be used.
- the onium compound is an onium salt, and for example, a sulfonium salt can be used.
- sulfonium salts include: And the sulfonium ion represented by And a salt with an anion represented by The curing catalyst is 0.01 to 10 parts by mass, 0.01 to 5 parts by mass, or 0.01 to 3 parts by mass with respect to 100 parts by mass of the polyorganosiloxane. Further, the sulfonate ion, chloride ion, nitrate ion, maleate ion and onium ion salt containing a hydrocarbon group is 0.1 to 10% by mass with respect to 100 parts by mass of the polyorganosiloxane, or 0 .1 to 5% by mass, or 0.1 to 3% by mass.
- rheology modifier examples include phthalic acid compounds such as dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, dihexyl phthalate, butyl isodecyl phthalate, adipic acid such as dinormal butyl adipate, diisobutyl adipate, diisooctyl adipate, octyl decyl adipate Compounds, maleic acid compounds such as dinormal butyl maleate, diethyl maleate, dinonyl maleate, oleic acid compounds such as methyl oleate, butyl oleate, tetrahydrofurfuryl oleate, and stearic acid compounds such as normal butyl stearate, glyceryl stearate Can be mentioned.
- the amount used is, for example, 0.001 to 10% by mass in the solid content.
- surfactant examples include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, polyoxyethylene octylphenol ether, polyoxyethylene nonylphenol.
- Polyoxyethylene alkyl aryl ethers such as ethers, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate
- Sorbitan fatty acid esters such as polyoxyethylene sorbitan monolaurate, polyoxyethylene
- Nonionic surfactants such as polyoxyethylene sorbitan fatty acid esters such as sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbitan tristearate, trade name EFTOP EF301, EF303, EF352 (manufactured by Tochem Products Co., Ltd.), trade names MegaFuck F171, F173, R-08, R-30 (manufactured by Dainippon Ink & Chemicals), Florard FC430, FC
- any solvent can be used as long as it can dissolve the solid content.
- solvents 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 monoethyl ether.
- the resist underlayer film forming composition of the present invention is coated on a semiconductor substrate (for example, a silicon / silicon dioxide coated substrate, a silicon nitride substrate, a glass substrate, an ITO substrate, etc.) by an appropriate coating method such as a spinner or a coater. Then, a resist underlayer film is formed by baking.
- a semiconductor substrate for example, a silicon / silicon dioxide coated substrate, a silicon nitride substrate, a glass substrate, an ITO substrate, etc.
- Calcination conditions are appropriately selected from a calcination temperature of 80 ° C. to 250 ° C. and a calcination time of 0.3 to 60 minutes.
- the firing temperature is 130 ° C. to 250 ° C.
- the firing time is 0.5 to 5 minutes.
- the film thickness of the resist underlayer film to be formed is, for example, 0.01 to 3.0 ⁇ m, preferably 0.01 to 1.0 ⁇ m, or 0.01 to 0.5 ⁇ m, for example. Or 0.01 to 0.05 ⁇ m.
- a layer of a high energy ray resist such as an EUV resist is formed on the resist underlayer film. Formation of the layer of the high energy beam resist can be performed by a well-known method, that is, coating and baking of the high energy beam resist composition solution on the lower layer film.
- a resist composition using a resin such as PMMA (polymethyl methacrylate), polyhydroxystyrene, or phenol resin can be used.
- exposure is performed through a predetermined mask.
- EUV light (13.5 nm), electron beam, X-ray or the like can be used.
- post-exposure heating PEB: Post Exposure Bake
- the post-exposure heating is appropriately selected from a heating temperature of 70 ° C. to 150 ° C. and a heating time of 0.3 to 10 minutes.
- Developers include aqueous solutions of alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, aqueous solutions of quaternary ammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline, ethanolamine, propylamine, An alkaline aqueous solution such as an aqueous amine solution such as ethylenediamine can be mentioned as an example. Further, a surfactant or the like can be added to these developers.
- the development conditions are appropriately selected from a temperature of 5 to 50 ° C. and a time of 10 to 300 seconds.
- the resist underlayer film is removed and the semiconductor substrate is processed.
- the resist underlayer film is removed by tetrafluoromethane, perfluorocyclobutane (C 4 F 8 ), perfluoropropane (C 3 F 8 ), trifluoromethane, carbon monoxide, argon, oxygen, nitrogen, sulfur hexafluoride, difluoro It is carried out using a gas such as methane, nitrogen trifluoride and chlorine trifluoride.
- a planarizing film, a gap fill material layer, or an organic underlayer film can be formed.
- a planarizing film or a gap fill material layer is formed.
- Synthesis example 1 18.60 g of tetramethoxysilane, 3.48 g of methyltrimethoxysilane, 1.62 g of (4-methoxyphenyl) trimethoxysilane and 35.55 g of acetone were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer. 0.01 mol / l hydrochloric acid (5.21 g) was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-1), and in polysiloxane, a unit structure derived from tetramethoxysilane, a unit structure derived from methyltrimethoxysilane, and derived from (4-methoxyphenyl) trimethoxysilane.
- the molar ratio of the unit structure was 70: 25: 5.
- the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis example 2 18.60 g of tetramethoxysilane, 3.48 g of methyltrimethoxysilane, 1.97 g of (4-methoxybenzyl) trimethoxysilane and 35.55 g of acetone were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer. 0.01 mol / l hydrochloric acid (5.21 g) was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-2), and the unit structure derived from tetramethoxysilane, the unit structure derived from methyltrimethoxysilane in polysiloxane, and derived from (4-methoxybenzyl) trimethoxysilane.
- the molar ratio of the unit structure was 70: 25: 5.
- the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis example 3 Put 18.60 g of tetramethoxysilane, 3.48 g of methyltrimethoxysilane, 1.82 g of [4- (methoxymethoxy) phenyl] trimethoxysilane and 35.55 g of acetone in a 300 ml flask, and mix the mixed solution with a magnetic stirrer. While stirring, 5.21 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-3), and in polysiloxane, a unit structure derived from tetramethoxysilane, a unit structure derived from methyltrimethoxysilane, [4- (methoxymethoxy) phenyl] trimethoxysilane
- the molar ratio of the unit structure derived from was 70: 25: 5.
- the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis example 4 Put 18.60 g of tetramethoxysilane, 3.48 g of methyltrimethoxysilane, 2.19 g of ⁇ 2- [6- (methoxymethoxy) naphthyl] ⁇ trimethoxysilane and 35.55 g of acetone in a 300 ml flask, While stirring with a tic stirrer, 5.21 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-4), and in polysiloxane, a unit structure derived from tetramethoxysilane, a unit structure derived from methyltrimethoxysilane, ⁇ 2- [6- (methoxymethoxy) naphthyl] ⁇
- the molar ratio of the unit structure derived from trimethoxysilane was 70: 25: 5.
- the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis example 5 18.60 g of tetramethoxysilane, 3.48 g of methyltrimethoxysilane, 2.03 g of pentafluorophenyltriethoxysilane, and 35.55 g of acetone are placed in a 300 ml flask, and 0.01 mol while stirring the mixed solution with a magnetic stirrer. / 21 hydrochloric acid (5.21 g) was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, ethanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure and concentrated to hydrolytic condensation.
- a product (polymer) propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-5), and the polysiloxane has a unit structure derived from tetramethoxysilane, a unit structure derived from methyltrimethoxysilane, and a unit structure derived from pentafluorophenyltriethoxysilane.
- the molar ratio was 70: 25: 5.
- the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis Example 6 18.60 g of tetramethoxysilane, 3.48 g of methyltrimethoxysilane, 1.62 g of (4-chlorophenyl) triethoxysilane, and 35.55 g of acetone were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer while stirring. .01 mol / l hydrochloric acid (5.21 g) was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, ethanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure and concentrated to hydrolytic condensation.
- a product (polymer) propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-6), and in polysiloxane, a unit structure derived from tetramethoxysilane, a unit structure derived from methyltrimethoxysilane, and a unit derived from (4-chlorophenyl) triethoxysilane
- the molar ratio of the structure was 70: 25: 5.
- the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis example 7 18.60 g of tetramethoxysilane, 3.48 g of methyltrimethoxysilane, 1.75 g of (4-bromophenyl) trimethoxysilane and 35.55 g of acetone were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer. 0.01 mol / l hydrochloric acid (5.21 g) was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-7), and is derived from a unit structure derived from tetramethoxysilane, a unit structure derived from methyltrimethoxysilane, and (4-bromophenyl) trimethoxysilane in polysiloxane.
- the molar ratio of the unit structure was 70: 25: 5.
- the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis example 8 18.60 g of tetramethoxysilane, 3.48 g of methyltrimethoxysilane, 3.24 g of (4-methoxyphenyl) trimethoxysilane and 35.55 g of acetone were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer. 0.01 mol / l hydrochloric acid (5.21 g) was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-1) and is derived from a unit structure derived from tetramethoxysilane in polysiloxane, a unit structure derived from methyltrimethoxysilane, or from (4-methoxyphenyl) trimethoxysilane.
- the molar ratio of the unit structure was 70:25:15.
- the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, 26 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction byproducts are distilled off under reduced pressure, and concentrated to hydrolyzed condensate (polymer).
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-1) and is derived from a unit structure derived from tetramethoxysilane in polysiloxane, a unit structure derived from methyltrimethoxysilane, or from (4-methoxyphenyl) trimethoxysilane.
- the molar ratio of the unit structure was 70:20:10.
- the weight average molecular weight by GPC was Mw1500 in terms of polystyrene.
- Synthesis Example 10 Tetramethoxysilane 7.5 g, methyltrimethoxysilane 1.5 g, pentafluorophenyltriethoxysilane 2.5 g, and acetone 19.5 g were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer to 0.01 mol. 2.7 g / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 26 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, ethanol, acetone, water and hydrochloric acid, which are reaction byproducts, are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (2-5), and the polysiloxane has a unit structure derived from tetramethoxysilane, a unit structure derived from methyltrimethoxysilane, and a unit structure derived from pentafluorophenyltriethoxysilane.
- the molar ratio was 70:20:10.
- the weight average molecular weight by GPC was Mw1500 in terms of polystyrene.
- Comparative Synthesis Example 1 18.60 g of tetramethoxysilane, 3.48 g of methyltrimethoxysilane, 1.41 g of phenyltrimethoxysilane, and 35.55 g of acetone were put into a 300 ml flask, and the mixed solution was stirred at 0.01 mol / l with a magnetic stirrer. Of hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (3-1), and the molar ratio of the unit structure derived from tetramethoxysilane, the unit structure derived from methyltrimethoxysilane, and the unit structure derived from phenyltrimethoxysilane in the polysiloxane.
- the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, 48.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 mass percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (3-1), and the molar ratio of the unit structure derived from tetraethoxysilane, the unit structure derived from methyltrimethoxysilane, and the unit structure derived from phenyltrimethoxysilane in the polysiloxane.
- the weight average molecular weight by GPC was Mw1500 in terms of polystyrene.
- Organic underlayer film (A layer) CNp-PM manufactured by Maruzen Petrochemical Co., Ltd. (in terms of molar ratio of vinyl naphthalene 60%: polyhydroxystyrene 40%, weight average molecular weight: 6000) was used as the organic underlayer film (A layer).
- maleic acid is MA
- benzyltriethylammonium chloride is BTAC
- N- (3-triethoxysilylpropyl) -4,5-dihydroimidazole is IMIDTEOS
- bis (4-hydroxyphenyl) sulfone is BPS
- propylene glycol monomethyl Ether acetate was abbreviated as PGMEA
- propylene glycol monoethyl ether as PGEE
- propylene glycol monomethyl ether as PGME
- ethyl lactate EL
- Water used was ultrapure water. Each addition amount was shown in parts by mass.
- the prepared resist underlayer film forming solution was used for measuring optical constants, and diluted to 1% by mass with a solid content, and used for resist pattern formation by EUV exposure and outgas measurement.
- the resist underlayer film forming composition was applied to each silicon wafer using a spinner.
- a resist underlayer film (thickness 0.05 ⁇ m) was formed by heating on a hot plate at 215 ° C. for 1 minute.
- These resist underlayer films were then analyzed using a spectroscopic ellipsometer (JA Woollam, VUV-VASE VU-302), with a refractive index (n value) and an optical extinction coefficient (k value, 193 nm, 248 nm). Also called attenuation coefficient).
- the organic underlayer film (A layer) forming composition was applied onto a silicon wafer and baked on a hot plate at 215 ° C. for 60 seconds to obtain an organic underlayer film (A layer) having a thickness of 90 nm.
- the resist underlayer film forming composition solution prepared in Examples 1 to 8 and Comparative Example 1 of the present invention was spin-coated and heated at 215 ° C. for 1 minute, whereby the resist underlayer film (B) layer ( 25 nm) is formed.
- an EUV resist solution (methacrylate resin resist) is spin-coated and heated to form an EUV resist layer (C), and an EUV exposure apparatus (Micro Exposure Tool, abbreviated as MET) is used.
- NA 0.30
- ⁇ 0.36 / 0.68
- exposure to Quadropole After exposure, PEB (post-exposure heating, 90 ° C.) was performed, cooled to room temperature on a cooling plate, developed and rinsed, and a resist pattern was formed. The evaluation evaluated whether or not a 26 nm line and space could be formed and the pattern shape by pattern cross-sectional observation.
- Examples 9 and 10 according to Synthesis Examples 9 and 10 obtained using a silane compound consisting only of a methoxy group as a hydrolyzable group use a silane compound containing a large amount of tetraethoxysilane containing an ethoxy group as a hydrolyzable group. The amount of outgas generated is smaller than in Comparative Example 2 obtained by Comparative Synthesis Example 2.
- the molar ratio of the silane hydrolyzable groups to methoxy groups: ethoxy groups is 100: 0 in all silanes.
- the molar ratio of the silane hydrolyzable groups to methoxy groups: ethoxy groups is 34: 3 in all silanes.
- the silane hydrolyzable group has a methoxy group: ethoxy group molar ratio of 28: 9 in all silanes.
- outgassing is reduced when the hydrolyzable group of silane is used in the range of 100: 0 to 80:20 in the molar ratio of methoxy group: ethoxy group in all silanes.
- a resist underlayer film forming composition for EUV lithography which can be used for manufacturing a semiconductor device, which enables fine substrate processing using a rectangular resist pattern. It is possible to provide a resist underlayer film for lithography that does not cause EUV resist exposure sensitivity, does not cause intermixing with the resist, has a higher dry etching rate than resist, and generates less outgas when exposed to EUV light. .
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Abstract
Description
これまで以上にプロファイル(レジスト形状)の制御や基板との密着性の向上が必要とされる。
そして、これまでもレジスト下層膜用の組成物の検討が行なわれてきているが、その要求される特性の多様性などから、レジスト下層膜用の新たな材料の開発が望まれている。
第2観点として、式(1)のR1がベンゼン環である第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、式(1)のR2がメトキシ基、メトキシメトキシ基、フッ素原子、塩素原子、又は臭素原子である第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、式(1)のXがメトキシ基である第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、式(1)のn1が0である第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、アルキルトリメトキシシランがメチルトリメトキシシランである第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7観点として、加水分解性シランは、テトラメトキシシラン70モルに対して、アルキルトリメトキシシラン10乃至35モル、アリールトリアルコキシシランが2乃至25モルの割合で含む第1観点乃至第6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、前記シランは、加水分解性基としてメトキシ基及びエトキシ基を全シラン中でメトキシ基:エトキシ基=100:0乃至80:20の割合(モル比)で含有するものである請求項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、
第9観点として、更に酸を含む第1観点乃至第8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10観点として、更に水を含む第1観点乃至第9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11観点として、更にアンモニウム化合物、環状アンモニウム化合物、環状アミン化合物、又はオニウム化合物を含む第1観点乃至第10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12観点として、第1観点乃至第11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13観点として、第1観点乃至第11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、焼成しレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布しレジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後に前記レジスト膜を現像しレジストパターンを得る工程、前記レジストパターンにより前記レジスト下層膜をエッチングする工程、及びパターン化された前記レジスト膜と前記レジスト下層膜により前記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14観点として、半導体基板上に有機下層膜を形成する工程、その上に第1観点乃至第11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塗布し焼成しレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布しレジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後に前記レジスト膜を現像しレジストパターンを得る工程、前記レジストパターンにより前記レジスト下層膜をエッチングする工程、パターン化された前記レジスト下層膜により前記有機下層膜をエッチングする工程、及びパターン化された前記有機下層膜により前記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。
また、本発明によれば、当該組成物から形成されたレジスト下層膜は、該下層膜上に設けられたEUVレジストの露光感度を向上させることができる。
また、本発明によれば、EUV光で露光時にアウトガス発生が少なく、レジストとのインターミキシングを起こさず、レジストに比較して大きなドライエッチング速度を有するリソグラフィー用レジスト下層膜を形成できる。
さらに、本発明によれば、当該組成物の適用により、斯様に良好な性能を有するレジスト下層膜を使用した半導体装置の製造が可能となる。
そして、ポリオルガノシロキサン構造(中間膜)は、その下に存在する有機下層膜のエッチングや、基板の加工(エッチング)にハードマスクとして有効である。即ち、基板加工時や有機下層膜の酸素系ドライエッチングガスに対して十分な耐ドライエッチング性を有するものである。
この下層膜中のアルコキシ基は、その後の処理工程で膜中に残留することがある。EUV露光時にこの残留アルコキシ基、又はその成分がアウトガスとなり露光機のミラーに付着するなどして露光機の汚染・故障の原因になることがある。本発明は加水分解性基としてエトキシ基を主体とするものではなく、メトキシ基を主体とするものを用いることによりそれらの問題を解決することができた。
固形分中に占める加水分解性シラン、その加水分解物、及びその加水分解縮合物の割合は、20質量%以上であり、例えば50乃至100質量%、又は60乃至100質量%、又は70乃至99.5質量%である。
式(1)のR2のアルコキシ基の中で、メトキシ基、メトキシメトキシ基は好ましく用いることができる。
また、加水分解性基の1モル当たり0.001乃至10モル、好ましくは0.001乃至1モルの加水分解触媒を用いることができる。
加水分解と縮合を行う際の反応温度は、通常20乃至90℃である。
加水分解は完全に加水分解を行うことも、部分加水分解することでもよい。即ち、加水分解縮合物中に加水分解物やモノマーが残存していてもよい。
加水分解し縮合させる際に触媒を用いることができる。
加水分解触媒としては、金属キレート化合物、有機酸、無機酸、有機塩基、無機塩基を挙げることができる。
特に、アセトン、メチルエチルケトン、メチル-n-プロピルケトン、メチル-n-ブチルケトン、ジエチルケトン、メチル-i-ブチルケトン、メチル-n-ペンチルケトン、エチル-n-ブチルケトン、メチル-n-ヘキシルケトン、ジ-i-ブチルケトン、トリメチルノナノン、シクロヘキサノン、メチルシクロヘキサノン、2,4-ペンタンジオン、アセトニルアセトン、ジアセトンアルコール、アセトフェノン、フェンチョン(1,1,3-トリメチル-2-ノルボルネン)等のケトン系溶媒が溶液の保存安定性の点で好ましい。
更にアンモニウム化合物、環状アンモニウム化合物、環状アミン化合物、又はオニウム化合物を用いることができる。
上記オニウム化合物としてはオニウム塩であり、例えばスルホニウム塩を用いることができる。スルホニウム塩としては、例えば
硬化触媒はポリオルガノシロキサン100質量部に対して、0.01乃至10質量部、または0.01乃至5質量部、または0.01乃至3質量部である。また、炭化水素基を含むスルホン酸イオン、塩化物イオン、硝酸イオン、マレイン酸イオンとオニウムイオンとの塩は、ポリオルガノシロキサン100質量部に対して0.1乃至10質量%であり、または0.1乃至5質量%、または0.1乃至3質量%である。
EUVレジストとしては例えば、PMMA(ポリメチルメタクリレート)、ポリヒドロキシスチレン、フェノール樹脂等の樹脂を用いたレジスト組成物を用いることができる。
テトラメトキシシラン18.60g、メチルトリメトキシシラン3.48g、(4-メトキシフェニル)トリメトキシシラン1.62g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-1)に相当し、ポリシロキサン中にテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、(4-メトキシフェニル)トリメトキシシランに由来する単位構造のモル比は70:25:5であった。GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラメトキシシラン18.60g、メチルトリメトキシシラン3.48g、(4-メトキシベンジル)トリメトキシシラン1.97g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-2)に相当し、ポリシロキサン中にテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、(4-メトキシベンジル)トリメトキシシランに由来する単位構造のモル比は70:25:5であった。GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラメトキシシラン18.60g、メチルトリメトキシシラン3.48g、[4-(メトキシメトキシ)フェニル]トリメトキシシラン1.82g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-3)に相当し、ポリシロキサン中にテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、[4-(メトキシメトキシ)フェニル]トリメトキシシランに由来する単位構造のモル比は70:25:5であった。GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラメトキシシラン18.60g、メチルトリメトキシシラン3.48g、{2-[6-(メトキシメトキシ)ナフチル]}トリメトキシシラン2.19g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-4)に相当し、ポリシロキサン中にテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、{2-[6-(メトキシメトキシ)ナフチル]}トリメトキシシランに由来する単位構造のモル比は70:25:5であった。GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラメトキシシラン18.60g、メチルトリメトキシシラン3.48g、ペンタフルオロフェニルトリエトキシシラン2.03g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、エタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-5)に相当し、ポリシロキサン中にテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、ペンタフルオロフェニルトリエトキシシランに由来する単位構造のモル比は70:25:5であった。GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラメトキシシラン18.60g、メチルトリメトキシシラン3.48g、(4-クロロフェニル)トリエトキシシラン1.62g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、エタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-6)に相当し、ポリシロキサン中にテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、(4-クロロフェニル)トリエトキシシランに由来する単位構造のモル比は70:25:5であった。GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラメトキシシラン18.60g、メチルトリメトキシシラン3.48g、(4-ブロモフェニル)トリメトキシシラン1.75g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-7)に相当し、ポリシロキサン中にテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、(4-ブロモフェニル)トリメトキシシランに由来する単位構造のモル比は70:25:5であった。GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラメトキシシラン18.60g、メチルトリメトキシシラン3.48g、(4-メトキシフェニル)トリメトキシシラン3.24g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-1)に相当し、ポリシロキサン中のテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、(4-メトキシフェニル)トリメトキシシランに由来する単位構造のモル比は70:25:15であった。GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラメトキシシラン7.5g、メチルトリメトキシシラン1.5g、(4-メトキシフェニル)トリメトキシシラン2.5g、アセトン19.5gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸2.7gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート26gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-1)に相当し、ポリシロキサン中のテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、(4-メトキシフェニル)トリメトキシシランに由来する単位構造のモル比は70:20:10であった。GPCによる重量平均分子量はポリスチレン換算でMw1500であった。
テトラメトキシシラン7.5g、メチルトリメトキシシラン1.5g、ペンタフルオロフェニルトリエトキシシラン2.5g、アセトン19.5gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸2.7gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート26gを加え、反応副生物であるメタノール、エタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(2-5)に相当し、ポリシロキサン中にテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、ペンタフルオロフェニルトリエトキシシランに由来する単位構造のモル比は70:20:10であった。GPCによる重量平均分子量はポリスチレン換算でMw1500であった。
テトラメトキシシラン18.60g、メチルトリメトキシシラン3.48g、フェニルトリメトキシシラン1.41g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(3-1)に相当し、ポリオシロキサン中のテトラメトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、フェニルトリメトキシシランに由来する単位構造のモル比は70:25:5であった。GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン7.5g、メチルトリメトキシシラン1.5g、フェニルトリメトキシシラン1.2g、アセトン35.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸5.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート48.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように調整した。得られたポリマーは式(3-1)に相当し、ポリシロキサン中のテトラエトキシシランに由来する単位構造、メチルトリメトキシシランに由来する単位構造、フェニルトリメトキシシランに由来する単位構造のモル比は70:25:5であった。GPCによる重量平均分子量はポリスチレン換算でMw1500であった。
丸善石油化学株式会社製のCNp-PM(成分はモル比としてビニルナフタレン60%:ポリヒドロキシスチレン40%、重量平均分子量:6000)を有機下層膜(A層)として使用した。
上記合成例1乃至10及び比較合成例1乃至2で得られたケイ素含有ポリマー、酸、硬化触媒、添加剤、溶媒、水を表1に示す割合となるように混合し、0.1μmのフッ素樹脂製のフィルターで濾過することによって、レジスト下層膜形成用組成物の溶液をそれぞれ調製した。表1中のポリマーの添加割合はポリマー溶液の添加量ではなく、ポリマー自体の添加量を示した。
表1中でマレイン酸はMA、ベンジルトリエチルアンモニウムクロリドはBTAC、N-(3-トリエトキシシリプロピル)-4,5-ジヒドロイミダゾールはIMIDTEOS、ビス(4-ヒドロキシフェニル)スルホンはBPS、プロピレングリコールモノメチルエーテルアセテートはPGMEA、プロピレングリコールモノエチルエーテルはPGEE、プロピレングリコールモノメチルエーテルはPGME、エチルラクテートはELと略した。水は超純水を用いた。各添加量は質量部で示した。
スピナーを用いてシリコンウェハー上にそれぞれ上記レジスト下層膜形成組成物を塗布した。ホットプレート上で215℃1分間加熱しレジスト下層膜(膜厚0.05μm)を形成した。そして、これらのレジスト下層膜を分光エリプソメーター(J.A. Woollam社製、VUV-VASE VU-302)を用い、波長193、248nm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。
上記有機下層膜(A層)形成組成物をシリコンウエハー上に塗布し、ホットプレート上で215℃で60秒間ベークし、膜厚90nmの有機下層膜(A層)を得た。その上に、本発明の実施例1乃至8、比較例1で調製されたレジスト下層膜形成組成物溶液をスピンコートし、215℃で1分間加熱することにより、レジスト下層膜(B)層(25nm)が形成される。その(B)層上に、EUV用レジスト溶液(メタクリレート樹脂系レジスト)をスピンコートし加熱を行い、EUVレジスト層(C)層を形成し、EUV露光装置(Micro Exposure Tool、略称MET)を用い、NA=0.30、σ=0.36/0.68、Quadropoleの条件で露光する。露光後、PEB(露光後加熱、90℃)を行い、クーリングプレート上で室温まで冷却し、現像及びリンス処理をし、レジストパターンを形成した。評価は、26nmのラインアンドスペースの形成可否、パターン断面観察によるパターン形状を評価した。
実施例9及び10、比較例2で調整したレジスト下層膜形成組成物溶液をスピナーを用い、シリコンウェハー上に塗布した。ホットプレート上で205℃1分間加熱し、レジスト下層膜(膜厚0.03μm)を形成した。
これらレジスト下層膜を用いて、Resist Outgassing Exposure(ROX)システムでアウトガス測定を行った。チャンバー内圧力は1.0乃至8.0×10-8の範囲にて、露光量6.0mJ/cm2でEUV露光し発生したアウトガス量をQuadropole MSにて測定した。アウトガスは分子量44を除く35乃至200の範囲で測定を行った。
アウトガス発生量の結果を表4に記載した。
単位は(Number of Molecule/cm2/s)である。
実施例9では全シラン中で、シランの加水分解性基がメトキシ基:エトキシ基のモル比が100:0である。
実施例10では全シラン中で、シランの加水分解性基がメトキシ基:エトキシ基のモル比が34:3である。
比較例2では全シラン中で、シランの加水分解性基がメトキシ基:エトキシ基のモル比が28:9である。
本発明では全シラン中で、シランの加水分解性基がメトキシ基:エトキシ基のモル比で100:0乃至80:20の範囲で用いることによりアウトガスの発生が少ないことがわかる。
Claims (14)
- シランとして、加水分解性シラン、その加水分解物、その加水分解縮合物、又はそれらの混合物を含み、該加水分解性シランがテトラメトキシシランとアルキルトリメトキシシランとアリールトリアルコキシシランとの組み合わせを含み、該アリールトリアルコキシシランは下記式(1):
- 式(1)のR1がベンゼン環である請求項1に記載のレジスト下層膜形成組成物。
- 式(1)のR2がメトキシ基、メトキシメトキシ基、フッ素原子、塩素原子、又は臭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。
- 式(1)のXがメトキシ基である請求項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。
- 式(1)のn1が0である請求項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。
- アルキルトリメトキシシランがメチルトリメトキシシランである請求項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。
- 加水分解性シランは、テトラメトキシシラン70モルに対して、アルキルトリメトキシシラン10乃至35モル、アリールトリアルコキシシランが2乃至25モルの割合で含む請求項1乃至請求項6のいずれか1項に記載のレジスト下層膜形成組成物。
- 前記シランは、加水分解性基としてメトキシ基及びエトキシ基を全シラン中でメトキシ基:エトキシ基=100:0乃至80:20の割合(モル比)で含有するものである請求項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。
- 更に酸を含む請求項1乃至請求項8のいずれか1項に記載のレジスト下層膜形成組成物。
- 更に水を含む請求項1乃至請求項9のいずれか1項に記載のレジスト下層膜形成組成物。
- 更にアンモニウム化合物、環状アンモニウム化合物、環状アミン化合物、又はオニウム化合物を含む請求項1乃至請求項10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11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11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、焼成しレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布しレジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後に前記レジスト膜を現像しレジストパターンを得る工程、前記レジストパターンにより前記レジスト下層膜をエッチングする工程、及びパターン化された前記レジスト膜と前記レジスト下層膜により前記半導体基板を加工する工程を含む半導体装置の製造方法。
- 半導体基板上に有機下層膜を形成する工程、その上に請求項1乃至請求項11のいずれか1項に記載のレジスト下層膜形成組成物を塗布し焼成しレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布しレジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後に前記レジスト膜を現像しレジストパターンを得る工程、前記レジストパターンにより前記レジスト下層膜をエッチングする工程、パターン化された前記レジスト下層膜により前記有機下層膜をエッチングする工程、及びパターン化された前記有機下層膜により前記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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US14/350,202 US9337052B2 (en) | 2011-10-06 | 2012-10-02 | Silicon-containing EUV resist underlayer film forming composition |
CN201280045182.3A CN103827752B (zh) | 2011-10-06 | 2012-10-02 | 形成含有硅的euv抗蚀剂下层膜的组合物 |
KR1020147010306A KR101943023B1 (ko) | 2011-10-06 | 2012-10-02 | 규소 함유 euv 레지스트 하층막 형성 조성물 |
JP2013537511A JP6065230B2 (ja) | 2011-10-06 | 2012-10-02 | ケイ素含有euvレジスト下層膜形成組成物 |
EP12838943.4A EP2765457A4 (en) | 2011-10-06 | 2012-10-02 | COMPOSITION FOR FORMING EUV RESERVE UNDERLAYER FILM CONTAINING SILICON |
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Also Published As
Publication number | Publication date |
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TWI575324B (zh) | 2017-03-21 |
US20140232018A1 (en) | 2014-08-21 |
KR101943023B1 (ko) | 2019-01-28 |
EP2765457A1 (en) | 2014-08-13 |
US9337052B2 (en) | 2016-05-10 |
JP6065230B2 (ja) | 2017-01-25 |
CN103827752B (zh) | 2018-11-02 |
KR20140089350A (ko) | 2014-07-14 |
TW201331720A (zh) | 2013-08-01 |
JPWO2013051558A1 (ja) | 2015-03-30 |
EP2765457A4 (en) | 2015-05-27 |
CN103827752A (zh) | 2014-05-28 |
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