WO2012050064A1 - ポリエーテル構造を含有する樹脂を含むリソグラフィー用レジスト下層膜形成組成物 - Google Patents
ポリエーテル構造を含有する樹脂を含むリソグラフィー用レジスト下層膜形成組成物 Download PDFInfo
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- WO2012050064A1 WO2012050064A1 PCT/JP2011/073233 JP2011073233W WO2012050064A1 WO 2012050064 A1 WO2012050064 A1 WO 2012050064A1 JP 2011073233 W JP2011073233 W JP 2011073233W WO 2012050064 A1 WO2012050064 A1 WO 2012050064A1
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- Prior art keywords
- resist underlayer
- underlayer film
- resist
- forming composition
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- MUWXWWWWBQWHQP-UHFFFAOYSA-N CCC(C)c1cccc(CC(C)C)c1 Chemical compound CCC(C)c1cccc(CC(C)C)c1 MUWXWWWWBQWHQP-UHFFFAOYSA-N 0.000 description 1
- GDZIVHQSMWCPCY-UHFFFAOYSA-N CCc1cccc(Oc2ccc(C3(c(cccc4)c4-c4ccccc34)c(cc3)ccc3OC)cc2)c1C#N Chemical compound CCc1cccc(Oc2ccc(C3(c(cccc4)c4-c4ccccc34)c(cc3)ccc3OC)cc2)c1C#N GDZIVHQSMWCPCY-UHFFFAOYSA-N 0.000 description 1
Classifications
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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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- 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
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
- C08G65/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols
- C08G65/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group
- C08G65/4006—(I) or (II) containing elements other than carbon, oxygen, hydrogen or halogen as leaving group (X)
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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
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
- C08G65/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols
- C08G65/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group
- C08G65/4012—Other compound (II) containing a ketone group, e.g. X-Ar-C(=O)-Ar-X for polyetherketones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
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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
- C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2051—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source
- G03F7/2059—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source using a scanning corpuscular radiation beam, e.g. an electron beam
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- 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
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
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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
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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
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3086—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
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- 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
- C08G2650/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G2650/28—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type
- C08G2650/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group
- C08G2650/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group containing ketone groups, e.g. polyarylethylketones, PEEK or PEK
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31942—Of aldehyde or ketone condensation product
Definitions
- the present invention relates to a resist underlayer film forming composition for lithography effective at the time of processing a semiconductor substrate, a resist pattern forming method using the resist underlayer film forming composition, and a method for manufacturing a semiconductor device.
- BARC Bottom Anti-Reflective Coating
- the present invention is intended to provide a resist underlayer film forming composition for use in a lithography process for manufacturing semiconductor devices. Another object of the present invention is to provide an excellent resist pattern without intermixing with the resist layer, and to have a dry etching rate close to that of the resist. It is an object of the present invention to provide a resist underlayer film for lithography having a selectivity ratio of 2 and a resist underlayer film for lithography having a selectivity ratio of a dry etching rate smaller than that of a semiconductor substrate.
- the present invention also provides a resist underlayer film for lithography that can provide the ability to effectively absorb the reflected light from the substrate when using irradiation light having a wavelength of 248 nm, 193 nm, 157 nm or the like for fine processing. It is what. Furthermore, the objective of this invention is providing the formation method of the resist pattern using the resist underlayer film forming composition.
- the present invention is intended to provide a resist underlayer film forming composition for forming a resist underlayer film that also has heat resistance.
- the following formula (1) (In formula (1), Ar 1 represents an organic group containing an arylene group or heterocyclic group having 6 to 50 carbon atoms), the following formula (2): (In the formula (2), Ar 2 , Ar 3 , and Ar 4 each represents an organic group containing an arylene group or heterocyclic group having 6 to 50 carbon atoms, and T represents a carbonyl group or a sulfonyl group.) Or a resist underlayer film forming composition for lithography comprising a polymer comprising a unit structure represented by formula (1) or a combination of a unit structure represented by formula (1) and a unit structure represented by formula (2):
- a resist underlayer film forming composition for lithography containing a polymer containing a unit structure represented by the above formula (1), wherein the organic group represented by Ar 1 is an organic group containing a fluorene structure
- the resist underlayer film forming composition according to the first aspect is an organic group containing a fluorene structure
- a resist underlayer film forming composition for lithography containing a polymer containing a unit structure represented by the above formula (2), wherein the organic group represented by Ar 2 is an organic group containing a fluorene structure.
- a resist underlayer film forming composition for lithography comprising a polymer comprising a combination of a unit structure represented by the above formula (1) and a unit structure represented by the above formula (2), wherein the Ar 1 And at least one of the organic groups represented by Ar 2 is a resist underlayer film forming composition according to the first aspect, which is an organic group containing a fluorene structure,
- a resist underlayer film forming composition for lithography containing a polymer containing a unit structure represented by the above formula (1), wherein the organic group represented by Ar 1 is an arylene group, carbon,
- the resist underlayer film forming composition according to the first aspect which is an organic group composed of a group containing a carbon triple bond and / or a combination of carbon and a group containing a carbon double bond,
- a resist underlayer film forming composition for lithography containing a polymer containing a unit structure represented by the above formula (2), wherein the organic group represented by Ar 2 is an arylene group, carbon
- the resist underlayer film forming composition according to the first aspect which is an organic group composed of a group containing a carbon triple bond and / or a combination of carbon and a group containing a carbon double bond,
- a resist underlayer film forming composition for lithography comprising a polymer comprising a combination of a unit structure represented by the above formula (1) and a unit structure represented by the above formula (2), wherein the Ar 1 And at least one of the organic groups represented by Ar 2 is an organic group composed of a combination of an arylene group and a group containing a carbon-carbon triple bond and / or a group containing a carbon-carbon double bond.
- a resist underlayer film forming composition for lithography containing a polymer containing a unit structure represented by the above formula (1), wherein the organic group represented by Ar 1 is an organic group containing a biphenylene structure
- the resist underlayer film forming composition according to the first aspect is an organic group containing a biphenylene structure
- a resist underlayer film forming composition for lithography containing a polymer containing a unit structure represented by the above formula (2), wherein the organic group represented by Ar 2 is an organic group containing a biphenylene structure
- the resist underlayer film forming composition according to the first aspect is an organic group containing a biphenylene structure
- a resist underlayer film forming composition for lithography comprising a polymer comprising a combination of a unit structure represented by the above formula (1) and a unit structure represented by the above formula (2), wherein the Ar 1 And at least one of the organic groups represented by Ar 2 is a resist underlayer film forming composition according to the first aspect, which is an organic group containing a biphenylene structure,
- a resist underlayer film forming composition for lithography comprising a polymer containing a unit structure represented by the above formula (2), wherein at least one of the organic groups represented by Ar 3 and Ar 4 is:
- the resist underlayer film forming composition according to the first aspect which is a phenylene group,
- a resist underlayer film forming composition for lithography comprising a polymer comprising a combination of a unit structure represented by the above formula (1) and a unit structure represented by the above formula (2), wherein the Ar 3 And the composition for forming a resist underlayer film according to the first aspect, wherein at least one of the organic groups represented by Ar 4 is a phenylene group,
- the resist underlayer film forming composition according to any one of the first to twelfth aspects, further comprising an acid or an acid generator.
- a step of forming an underlayer film with a resist underlayer film forming composition according to any one of the first to thirteenth aspects on a semiconductor substrate, a step of forming a resist film thereon, the resist A step of forming a resist pattern by irradiating the film with light or an electron beam and then developing, a step of etching the lower layer film according to the resist pattern of the resist film, and processing a semiconductor substrate according to the patterned lower layer film
- a method of manufacturing a semiconductor device including the steps of:
- a step of forming an underlayer film on the semiconductor substrate with the resist underlayer film forming composition according to any one of the first to thirteenth aspects, a step of forming a hard mask thereon, and further Forming a resist film, irradiating the resist film with light or an electron beam and then developing the resist pattern, developing a resist pattern according to the resist pattern of the resist film,
- the method of manufacturing a semiconductor device includes a step of etching the lower layer film according to the hard mask and a step of processing the semiconductor substrate according to the patterned lower layer film.
- the resist underlayer film forming composition of the present invention can form a good resist pattern shape without causing intermixing with the upper layer portion of the resist underlayer film.
- the resist underlayer film forming composition of the present invention can be imparted with the ability to efficiently suppress reflection from the substrate, and can also have an effect as an antireflection film for exposure light.
- the dry etching rate selectivity close to the resist, the dry etching rate selectivity lower than that of the resist, and the dry etching rate selectivity lower than that of the semiconductor substrate are excellent.
- a resist underlayer film can be provided.
- the resist is thinned.
- the resist pattern is transferred to the lower layer film by an etching process, the substrate processing is performed using the lower layer film as a mask, or the resist pattern is transferred to the lower layer film by an etching process, and further to the lower layer film.
- the resist underlayer film and the composition for forming the 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.
- a resist underlayer film is formed on a substrate by a resist underlayer film forming composition, a hard mask is formed thereon, a resist film is formed thereon, a resist pattern is formed by exposure and development, and the resist pattern is hard masked
- 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 polyether structure, for example, a copolymer containing a unit structure of fluorene naphthol and arylene alkylene. It becomes difficult to occur.
- the present invention is a resist underlayer film forming composition for lithography comprising a polymer comprising a unit structure represented by the unit structure represented by the formula (1), the unit structure represented by the formula (2), or a combination thereof. And it can contain a crosslinking agent and an acid, and can contain additives, such as an acid generator and surfactant, as needed.
- the solid content of the composition is 0.1 to 70% by mass, or 0.1 to 60% by mass. Solid content is the content rate of the remaining component remove
- the polymer can be contained in the solid content in a proportion of 1 to 100% by mass, or 1 to 99% by mass, or 50 to 99% by mass.
- the polymer used in the present invention has a weight average molecular weight of 600 to 1000000, preferably 1000 to 200000.
- the unit structure represented by the formula (1) represents a unit structure having a polyether structure
- the unit structure represented by the formula (2) represents a unit structure having a polyether ether ketone structure or a polyether ether sulfone structure.
- Ar 1 represents an organic group containing an arylene group or heterocyclic group having 6 to 50 carbon atoms.
- the organic group is divalent to tetravalent, for example.
- Ar 2 , Ar 3 , and Ar 4 each represent an organic group containing an arylene group or heterocyclic group having 6 to 50 carbon atoms
- T is a carbonyl group or a sulfonyl group Represents a group.
- the arylene group or heterocyclic group in the organic group represented by Ar 1 to Ar 4 can be used singly or in combination of two or more.
- the arylene group and the heterocyclic group are, for example, divalent to tetravalent.
- the arylene group having 6 to 50 carbon atoms is a divalent organic group corresponding to an aryl group, such as a phenyl group, an o-methylphenyl group, an m-methylphenyl group, a p-methylphenyl group, an 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, ⁇ - Naphtyl 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
- Heterocyclic groups correspond to heterocyclic rings such as pyrrole, thiophene, furan, imidazole, triazole, oxazole, thiazole, pyrazole, isoxazole, isothiazole, pyridine, pyridazine, pyrimidine, pyrazine, piperidine, piperazine, morpholine, pyran, carbazole, etc.
- An organic group can be used.
- the organic group containing an arylene group having 6 to 50 carbon atoms is the above arylene group alone or the above arylene group and a group containing a carbon-carbon triple bond and / or a group containing a carbon-carbon double bond. It can be used as a combination.
- an organic group containing an arylene group an organic group containing a fluorene structure or an organic group containing a biphenylene structure can be used.
- the unit structure of the polymer 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 represented by the following formula (4), and a polymer or oligomer having a repeating unit represented by the following formula (5).
- R 7 and R 8 each represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 20 carbon atoms
- n7 represents an integer of 1 to 4 and n8 is 1 To an integer of (5-n7)
- n7 + n8 represents an integer of 2 to 5.
- R 9 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 10 represents an alkyl group having 1 to 10 carbon atoms
- n9 represents an integer of 1 to 4
- n10 is 0 To (4-n9)
- n9 + n10 represents an integer of 1 to 4.
- the oligomer and polymer can be used in the range of 2 to 100 or 2 to 50 repeating unit structures.
- the above compounds can be obtained as products of Asahi Organic Materials Co., Ltd. and Honshu Chemical Industry Co., Ltd.
- the compound represented by the formula (6-21) among the above crosslinking agents 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, sulfosalicylic acid, citric acid, benzoic acid, hydroxybenzoic acid, naphthalenecarboxylic acid Acidic compounds such as acids or / and thermal acid generators such as 2,4,4,6-tetrabromocyclohexadienone, benzoin tosylate, 2-nitrobenzyl tosylate, and other organic sulfonic acid alkyl esters may be added. It can.
- the blending amount is 0.0001 to 20% by mass, preferably 0.0005 to 10% by mass, preferably 0.01 to 3% by mass, based on the total solid content.
- a photoacid generator can be added in order to match the acidity with the photoresist coated on the upper layer in the lithography process.
- Preferred photoacid generators include, for example, onium salt photoacid generators such as bis (4-t-butylphenyl) iodonium trifluoromethanesulfonate, triphenylsulfonium trifluoromethanesulfonate, and phenyl-bis (trichloromethyl) -s.
- -Halogen-containing compound photoacid generators such as triazine, and sulfonic acid photoacid generators such as benzoin tosylate and N-hydroxysuccinimide trifluoromethanesulfonate.
- the photoacid generator is 0.2 to 10% by mass, preferably 0.4 to 5% by mass, based on the total solid content.
- further light absorbers, rheology modifiers, adhesion aids, surfactants, and the like can be added to the resist underlayer film material for lithography of the present invention as necessary.
- the light absorbing agent examples include commercially available light absorbing agents 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. D isperse Orange 1, 5, 13, 25, 29, 30, 31, 44, 57, 72 and 73; 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. FluorescentesBrightening Agent 112, 135 and 163; I. Solvent Orange 2 and 45; I. Solvent Red 1, 3, 8, 23, 24, 25, 27 and 49; I. Pigment Green 10; C.I. I. Pigment Brown 2 or the like can be preferably used.
- the above light-absorbing agent is usually blended at a ratio of 10% by mass or less, preferably 5% by mass or less, based on the total solid content of the resist underlayer film material for lithography.
- the rheology modifier mainly improves the fluidity of the resist underlayer film forming composition, and improves the film thickness uniformity of the resist underlayer film and the fillability of the resist underlayer film forming composition inside the hole, particularly in the baking process. It is added for the purpose of enhancing.
- phthalic acid derivatives such as dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, dihexyl phthalate, and butyl isodecyl phthalate
- adipic acid derivatives such as dinormal butyl adipate, diisobutyl adipate, diisooctyl adipate, octyl decyl adipate
- maleic acid derivatives such as normal butyl maleate, diethyl maleate and dinonyl maleate
- oleic acid derivatives such as methyl oleate, butyl oleate and tetrahydrofurfuryl oleate
- stearic acid derivatives such as normal butyl stearate and glyceryl stearate. it can.
- These rheology modifiers are usually blended at a ratio of less than 30% by mass with respect to the total solid content of the resist underlayer film material
- the adhesion auxiliary agent is added mainly for the purpose of improving the adhesion between the substrate or resist and the resist underlayer film forming composition, and preventing the resist from being peeled off particularly during development.
- Specific examples include chlorosilanes such as trimethylchlorosilane, dimethylvinylchlorosilane, methyldiphenylchlorosilane, chloromethyldimethylchlorosilane, trimethylmethoxysilane, dimethyldiethoxysilane, methyldimethoxysilane, dimethylvinylethoxysilane, diphenyldimethoxysilane, Alkoxysilanes such as enyltriethoxysilane, hexamethyldisilazane, N, N'-bis (trimethylsilyl) urea, silazanes such as dimethyltrimethylsilylamine, trimethylsilylimidazole, vinyltrichlorosilane, ⁇ -chloropropyl
- a surfactant can be blended in order to further improve the applicability to surface unevenness.
- the surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, polyoxyethylene octylphenol ether, polyoxyethylene nonyl Polyoxyethylene alkyl allyl ethers such as phenol ether, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate Sorbitan fatty acid esters such as rate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sol
- Nonionic surfactants such as polyoxyethylene sorbit
- the blending amount of these surfactants is usually 2.0% by mass or less, preferably 1.0% by mass or less, based on the total solid content of the resist underlayer film material for lithography of the present invention.
- These surfactants may be added alone or in combination of two or more.
- the solvent for dissolving the polymer 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- -Ethyl methyl propionate, ethyl ethioacetate, ethyl hydroxyacetate, 2-hydroxypropionic acid
- a high boiling point solvent such as propylene glycol monobutyl ether or propylene glycol monobutyl ether acetate can be mixed and used.
- a high boiling point solvent such as propylene glycol monobutyl ether or propylene glycol monobutyl ether acetate
- propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethyl lactate, butyl lactate, cyclohexanone and the like are preferable for improving the leveling property.
- a photoresist As the resist used in the present invention, a photoresist, an electron beam resist, or the like can be used.
- 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 & Hearts Co., Ltd., and trade name APEX-E.
- an acid is generated by irradiation of a resin containing an Si-Si bond in the main chain and an aromatic ring at the terminal and an electron beam.
- examples include a composition comprising an acid generator, or a composition comprising a poly (p-hydroxystyrene) having a hydroxyl group substituted with an organic group containing N-carboxyamine and an acid generator that generates an acid upon irradiation with an electron beam. It is done.
- the acid generated from the acid generator by electron beam irradiation reacts with the N-carboxyaminoxy group of the polymer side chain, and the polymer side chain decomposes into a hydroxyl group and exhibits alkali solubility, thereby exhibiting alkali solubility.
- the acid generated from the acid generator by electron beam irradiation reacts with the N-carboxyaminoxy group of the polymer side chain, and the polymer side chain decomposes into a hydroxyl group and exhibits alkali solubility, thereby exhibiting alkali solubility.
- Acid generators that generate an acid upon irradiation with this electron beam are 1,1-bis [p-chlorophenyl] -2,2,2-trichloroethane, 1,1-bis [p-methoxyphenyl] -2,2,2 -Halogenated organic compounds such as trichloroethane, 1,1-bis [p-chlorophenyl] -2,2-dichloroethane, 2-chloro-6- (trichloromethyl) pyridine, triphenylsulfonium salts, diphenyliodonium salts, etc. Examples thereof include sulfonic acid esters such as onium salts, nitrobenzyl tosylate, and dinitrobenzyl tosylate.
- Alcohol aqueous solutions such as alcohol amines, quaternary ammonium salts such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline, and cyclic amines such as pyrrole and piperidine can be used.
- an appropriate amount of an alcohol such as isopropyl alcohol or a nonionic surfactant may be added to the alkaline aqueous solution.
- preferred developers are quaternary ammonium salts, more preferably tetramethylammonium hydroxide and choline.
- a spinner, a coater, etc. are suitably used on a substrate (for example, a transparent substrate such as a silicon / silicon dioxide coating, a glass substrate, an ITO substrate) used for manufacturing a precision integrated circuit device.
- a substrate for example, a transparent substrate such as a silicon / silicon dioxide coating, a glass substrate, an ITO substrate
- the resist underlayer film forming composition After applying the resist underlayer film forming composition by a simple coating method, it is baked and cured to form a coating type underlayer film.
- the thickness of the resist underlayer film is preferably 0.01 to 3.0 ⁇ m.
- the conditions for baking after coating are 80 to 350 ° C. and 0.5 to 120 minutes.
- a good resist pattern can be obtained by performing, developing, rinsing and drying. If necessary, heating after irradiation with light or an electron beam (PEB: Post Exposure Bake) can also 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 light, far ultraviolet light, or extreme ultraviolet light (for example, EUV), for example, 248 nm (KrF laser light), 193 nm (ArF laser light), 157 nm (F 2 ).
- Light having a wavelength such as 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.
- a 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 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 a step of forming a hard mask with a coating material containing a silicon component or the like thereon, and further forming a resist film thereon
- a semiconductor device can be manufactured through a process of processing a semiconductor substrate with a lower layer 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.
- the resist underlayer film forming composition for lithography according to the present invention has high thermal stability, can prevent contamination of the upper layer film by decomposition products during baking, and can provide a margin for the temperature margin of the baking process. is there.
- the resist underlayer film material for lithography has a function of preventing reflection of light depending on process conditions, and further prevents the interaction between the substrate and the photoresist, or a material or photoresist used for the photoresist.
- the film can be used as a film having a function of preventing an adverse effect on a substrate of a substance generated during exposure.
- Synthesis example 1 In a flask equipped with a stirrer, a reflux condenser and a thermometer, 28.04 g of 9,9-bis (4-hydroxyphenyl) fluorene, 13.97 g of 4,4′-difluorobenzophenone, 12.32 g of potassium carbonate, N-methyl 162.56 g of -2-pyrrolidinone was added. Thereafter, the inside of the flask was purged with nitrogen, and then the internal temperature was heated to 140 ° C. and reacted for about 24 hours.
- the filtrate is recovered by filtration in order to remove the precipitate, and about 90:10 mixture of N-methyl-2-pyrrolidinone and 2 mol / l hydrochloric acid is used. Mix with 10 ml. Thereafter, the reaction filtrate was poured into methanol for reprecipitation purification. Further, the precipitate was washed with water and methanol and vacuum dried at 85 ° C. for about 1 day to obtain a polyether used in the present invention. The obtained polymer corresponded to the formula (3-1). When the GPC analysis of the obtained polymer having an ether structure was performed, the weight average molecular weight was 6900 in terms of standard polystyrene, and the polydispersity Mw / Mn was 1.83.
- Synthesis example 2 In a 100 ml three-necked flask, 6.76 g of 6,6 ′-(9H-fluorene-9,9-diyl) dinaphthalen-2-ol, 3.27 g of 4,4′-difluorobenzophenone, and 42. N-methyl-2-pyrrolidinone. 72 g and 2.49 g of potassium carbonate were added. Thereafter, the inside of the flask was purged with nitrogen, heated to 170 ° C., and allowed to react for about 24 hours. Thereafter, 0.65 g of 1-naphthol dissolved in 5.84 g of N-methyl-2-pyrrolidinone was added, and the mixture was further stirred for 2 hours.
- the reaction mixture was diluted with 20 g of N-methyl-2-pyrrolidinone and the precipitate was removed by filtration.
- the collected filtrate was dropped into a methanol / water / toluene (350 g / 50 g / 30 g) mixed solution to cause reprecipitation.
- the obtained precipitate was suction filtered, and the filtrate was dried under reduced pressure at 85 ° C. overnight.
- 7.92g of polyether of light skin color powder was obtained.
- the obtained polymer corresponded to the formula (3-2).
- the weight average molecular weight Mw measured in terms of polystyrene by GPC was 9400, and the polydispersity Mw / Mn was 2.21.
- Synthesis example 3 A 100 ml three-necked flask was charged with 5.09 g of 4- (4-fluorophenylethynyl) phenol, 45.84 g of N-methyl-2-pyrrolidinone, and 3.65 g of potassium carbonate. Thereafter, the inside of the flask was purged with nitrogen, heated to 170 ° C., and allowed to react for about 24 hours. After completion of the reaction, the precipitate was removed by filtration. The collected filtrate was dropped into a mixed solution of methanol 400 g and reprecipitated. The obtained precipitate was suction filtered, and the filtrate was dried under reduced pressure at 85 ° C. overnight. And 5.12g of green powder polyether was obtained. The obtained polymer corresponded to Formula (3-3). The weight average molecular weight Mw measured in terms of polystyrene by GPC was 51000, and the polydispersity Mw / Mn was 5.47.
- Synthesis example 4 In a 100 ml three-necked flask, 2.76 g of p- (3,4-difluorophenylethynyl) phenol, 2.10 g of 9,9-bis (4-hydroxyphenyl) fluorene, 27.57 g of N-methyl-2-pyrrolidinone, potassium carbonate 3 .48 g was added. Thereafter, the inside of the flask was purged with nitrogen, and then heated to 150 ° C. and reacted for about 6 hours. After completion of the reaction, the precipitate was removed by filtration. The collected filtrate was dropped into a methanol / water (500 g / 250 g) mixed solution to cause reprecipitation.
- methanol / water 500 g / 250 g
- the obtained precipitate was suction filtered, and the filtrate was dried under reduced pressure at 85 ° C. overnight. And 3.70g of polyether of skin color powder was obtained.
- the obtained polymer corresponded to the formula (3-4).
- the weight average molecular weight Mw measured in terms of polystyrene by GPC was 20000, and the polydispersity Mw / Mn was 4.49.
- Synthesis example 5 In a 100 ml three-necked flask, 8.06 g of 9,9-bis (4-hydroxyphenyl) fluorene, 4.81 g of 2,4-difluorobiphenyl, 32.35 g of N-methyl-2-pyrrolidinone, and 6.99 g of potassium carbonate were placed. Thereafter, the inside of the flask was purged with nitrogen, heated to 170 ° C., and allowed to react for about 24 hours. Thereafter, 0.99 g of 1-naphthol dissolved in 8.95 g of N-methyl-2-pyrrolidinone was added, and the mixture was further stirred for 2 hours. After completion of the reaction, the precipitate was removed by filtration.
- the collected filtrate was dropped into a methanol / water (160 g / 40 g) mixed solution to cause reprecipitation.
- the obtained precipitate was suction filtered, and the filtrate was dried under reduced pressure at 85 ° C. overnight. And 5.90g of polyether of flesh-colored powder was obtained.
- the obtained polymer corresponded to the formula (3-5).
- the weight average molecular weight Mw measured in terms of polystyrene by GPC was 1000, and the polydispersity Mw / Mn was 1.21.
- Synthesis Example 6 As an example of the synthesis of a polymer having a polyether structure, 32.02 g of 2,2-bis (4-hydroxyphenyl) propane and 4,4′-difluorobenzophenone 25 were added to a flask equipped with a stirrer, a reflux condenser and a thermometer. .97 g, potassium carbonate 21.30 g, and N-methyl-2-pyrrolidinone 237.76 g were added. Thereafter, the inside of the flask was purged with nitrogen, and then the internal temperature was heated to 140 ° C. and reacted for about 24 hours.
- the filtrate is recovered by filtration in order to remove the precipitate, and about 90:10 mixture of N-methyl-2-pyrrolidinone and 2 mol / l hydrochloric acid is used. Mix with 10 ml. Thereafter, the reaction filtrate was put into a methanol / water (volume ratio 90/10) mixed solution for reprecipitation purification. Further, the precipitate was washed with water and methanol and vacuum dried at 85 ° C. for about 1 day to obtain a polyether used in the present invention. The obtained polymer corresponded to the formula (3-6). When the GPC analysis of the obtained polymer having an ether structure was performed, the weight average molecular weight was 7600 in terms of standard polystyrene, and the polydispersity Mw / Mn was 1.96.
- Synthesis example 7 As an example of the synthesis of a polymer having a polyether structure, 17.52 g of 9,9-bis (4-hydroxyphenyl) fluorene and 2,6-difluorobenzonitrile 6 were added to a flask equipped with a stirrer, a reflux condenser and a thermometer. .22 g, potassium carbonate 7.64 g, and N-methyl-2-pyrrolidinone 94.63 g were added. Thereafter, the inside of the flask was purged with nitrogen, and then the internal temperature was heated to 140 ° C. and reacted for about 24 hours.
- the filtrate is recovered by filtration, and a mixture of N-methyl-2-pyrrolidinone and 2 mol / l hydrochloric acid having a volume ratio of 90:10 is obtained. Mix with 10 ml. Thereafter, the reaction filtrate was put into a methanol solution to perform reprecipitation purification. Further, the precipitate was washed with water and methanol, and vacuum dried at 85 ° C. for about 1 day to obtain 19.72 g of a polyether used in the present invention. The obtained polymer corresponded to the formula (3-7). When the GPC analysis of the obtained polymer having an ether structure was performed, the weight average molecular weight was 15000 and the polydispersity Mw / Mn was 2.65 in terms of standard polystyrene.
- Synthesis example 8 As an example of the synthesis of a polymer having a polyether structure, 26.29 g of 9,9-bis (4-hydroxyphenyl) fluorene and 2,5-difluoronitrobenzene were added to a flask equipped with a stirrer, a reflux condenser and a thermometer. 35 g, 11.40 g of potassium carbonate, and 147.07 g of N-methyl-2-pyrrolidinone were added. Thereafter, the inside of the flask was purged with nitrogen, and then the internal temperature was heated to 140 ° C. and reacted for about 24 hours.
- the filtrate is recovered by filtration in order to remove the precipitate, and about 90:10 mixture of N-methyl-2-pyrrolidinone and 2 mol / l hydrochloric acid is used. Mix with 10 ml. Thereafter, the reaction filtrate was put into a methanol solution to perform reprecipitation purification. Further, the precipitate was washed with water and methanol and vacuum-dried at 85 ° C. for about 1 day to obtain 28.39 g of a polyether used in the present invention. The obtained polymer corresponded to the formula (3-8).
- the weight average molecular weight was 4400 in terms of standard polystyrene, and the polydispersity Mw / Mn was 1.70.
- Example 1 In 3 g of the resin obtained in Synthesis Example 1, 12 g of cyclohexanone was dissolved to form a solution, and a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 2 In 3 g of the resin obtained in Synthesis Example 2, 12 g of cyclohexanone was dissolved to prepare a solution, and a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 3 In 3 g of the resin obtained in Synthesis Example 3, 12 g of cyclohexanone was dissolved to form a solution, and a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 4 In 3 g of the resin obtained in Synthesis Example 4, 12 g of cyclohexanone was dissolved to form a solution, and a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 5 In 3 g of the polymer obtained in Synthesis Example 5, 12 g of cyclohexanone was dissolved to prepare a solution, and a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- Example 6 In 3 g of the polymer obtained in Synthesis Example 6, 12 g of cyclohexanone was dissolved to form a solution to prepare a resist underlayer film forming composition solution for use in a lithography process using a multilayer film.
- Example 7 20 g of the resin obtained in Synthesis Example 1 is mixed with 3.0 g of a crosslinking agent (manufactured by Nippon Cytec Industries, Ltd., the component is tetramethoxymethylglycoluril, formula (7-1)) and 0.30 g of paratoluenesulfonic acid as a catalyst. Then, it was dissolved in 88 g of cyclohexanone to obtain a solution, and a solution of a resist underlayer film forming composition used for a lithography process using a multilayer film was prepared.
- a crosslinking agent manufactured by Nippon Cytec Industries, Ltd., the component is tetramethoxymethylglycoluril, formula (7-1)
- Example 8 To 20 g of the resin obtained in Synthesis Example 2, 3.0 g of a crosslinking agent (manufactured by Nippon Cytec Industries, Ltd., the component is tetramethoxymethyl glycoluril, formula (7-1)), 0.30 g of pyridinium p-toluenesulfonate as a catalyst, interface 0.06 g of Megafac R-30 as an activator was mixed and dissolved in 88 g of cyclohexanone to prepare a solution, which was a resist underlayer film forming composition solution used in a lithography process using a multilayer film.
- a crosslinking agent manufactured by Nippon Cytec Industries, Ltd., the component is tetramethoxymethyl glycoluril, formula (7-1)
- 0.30 g of pyridinium p-toluenesulfonate as a catalyst
- interface 0.06 g of Megafac R-30 as an activator was mixed and dissolved in 88
- Example 9 In 3 g of the polymer obtained in Synthesis Example 7, 12 g of cyclohexanone was dissolved to form a solution to prepare a resist underlayer film forming composition solution used in the lithography process using a multilayer film.
- Example 10 In 3 g of the polymer obtained in Synthesis Example 7, 12 g of cyclohexanone was dissolved to form a solution to prepare a resist underlayer film forming composition solution used in the lithography process using a multilayer film.
- Example 10
- a solution of a resist underlayer film forming composition used in a lithography process using a multilayer film was prepared by dissolving in 3 g of the polymer obtained in Synthesis Example 8 in 12 g of cyclohexanone to form a solution.
- Comparative Example 2 A solution was prepared by dissolving 3 g of polyethylene glycol (manufactured by Tokyo Chemical Industry Co., Ltd.) having a molecular weight of 1000 in 12 g of propylene glycol monoethyl ether acetate.
- the resist underlayer film forming composition solutions prepared in Examples 1 to 10 were applied onto a silicon wafer using a spin coater. Baking was performed at 240 ° C. for 1 minute on a hot plate (205 ° C. for 1 minute in Comparative Example 1, 160 ° C. for 1 minute in Comparative Example 2) or 400 ° C. for 2 minutes to form a resist underlayer film (film thickness 0.20 ⁇ m).
- the resist underlayer film was subjected to an immersion test in a solvent used for the resist, such as ethyl lactate, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, and cyclohexanone.
- a phenol novolac resin solution was formed on a silicon wafer using a spin coater.
- the dry etching rate was measured using CF 4 gas as an etching gas, and the dry etching rates of the resist underlayer films of Examples 1 to 10 and Comparative Examples 1 and 2 were compared. The results are shown in Table 2.
- the dry etching rate ratio in Examples 1 to 10 was (1) of dry etching rate ratio of (resist underlayer film baked at 240 ° C.) / (Phenol novolak resin baked at 240 ° C.) and (resist under layer film baked at 400 ° C.). / (Dry etching rate ratio (2) of (novolak resin baked at 240 ° C.)).
- the resist underlayer film forming composition solutions prepared in Examples 1 to 10 and Comparative Examples 1 and 2 were applied onto a silicon wafer using a spin coater.
- the resist underlayer film (film thickness 0.20 ⁇ m) was formed by baking at 400 ° C. for 2 minutes on a hot plate.
- the obtained film was heated at a rate of 10 ° C. for 1 minute and subjected to thermogravimetric analysis in the atmosphere, and the temperature at which the mass decreased by 5 percent was measured. The results are shown in Table 3.
- 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 low dry etching rate selection ratio as compared with a substrate and can also have an effect as an antireflection film. It was also found that the lower layer film material of the present invention has heat resistance capable of forming a hard mask on the upper layer by vapor deposition.
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Abstract
Description
また、フルオレン構造を有する耐熱性レジスト下層膜が記載されている(特許文献1)。
そして、架橋剤と酸を含むことができ、必要に応じて酸発生剤、界面活性剤等の添加剤を含むことができる。この組成物の固形分は0.1乃至70質量%、または0.1乃至60質量%である。固形分はレジスト下層膜形成組成物から溶剤を除いた残りの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質量%、または50乃至99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、好ましくは1000乃至200000である。
式(1)で表される単位構造において、Ar1は炭素数6乃至50のアリーレン基又は複素環基を含む有機基を表す。該有機基は例えば2乃至4価を示す。また、式(2)において、式(2)中、Ar2、Ar3、及びAr4はそれぞれ炭素数6乃至50のアリーレン基又は複素環基を含む有機基を表し、Tはカルボニル基またはスルホニル基を表す。Ar1乃至Ar4で表される有機基中のアリーレン基又は複素環基は、それぞれ一種又は二種以上の組み合わせとして用いることができる。該アリーレン基及び該複素環基は例えば2乃至4価を示す。
また、上記アリーレン基を含む有機基としては、フルオレン構造を含む有機基、又はビフェニレン構造を含む有機基を用いることができる。
また、上記架橋剤としては耐熱性の高い架橋剤を用いることができる。耐熱性の高い架橋剤としては分子内に芳香族環(例えば、ベンゼン環、ナフタレン環)を有する架橋形成置換基を含有する化合物を好ましく用いることができる。
この化合物は下記式(4)で表される部分構造を有する化合物や、下記式(5)で表される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。
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。
本発明のリソグラフィー用レジスト下層膜材料には、上記以外に必要に応じて更なる吸光剤、レオロジー調整剤、接着補助剤、界面活性剤などを添加することができる。
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、ロームアンドハーツ社製、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。
今後、レジストパターンの微細化が進行すると、解像度の問題やレジストパターンが現像後に倒れるという問題が生じ、レジストの薄膜化が望まれてくる。そのため、基板加工に充分なレジストパターン膜厚を得ることが難しく、レジストパターンだけではなく、レジストと加工する半導体基板との間に作成されるレジスト下層膜にも基板加工時のマスクとしての機能を持たせるプロセスが必要になってきた。このようなプロセス用のレジスト下層膜として従来の高エッチレート性レジスト下層膜とは異なり、レジストに近いドライエッチング速度の選択比を持つリソグラフィー用レジスト下層膜、レジストに比べて小さいドライエッチング速度の選択比を持つリソグラフィー用レジスト下層膜や半導体基板に比べて小さいドライエッチング速度の選択比を持つリソグラフィー用レジスト下層膜が要求されるようになってきている。また、このようなレジスト下層膜には反射防止能を付与することも可能であり、従来の反射防止膜の機能を併せ持つことができる。
本発明では基板上に本発明のレジスト下層膜を成膜した後、レジスト下層膜上に直接、または必要に応じて1層乃至数層の塗膜材料をレジスト下層膜上に成膜した後、レジストを塗布することができる。これによりレジストのパターン幅が狭くなり、パターン倒れを防ぐ為にレジストを薄く被覆した場合でも、適切なエッチングガスを選択することにより基板の加工が可能になる。
即ち、半導体基板にレジスト下層膜形成組成物により該レジスト下層膜を形成する工程、その上にケイ素成分等を含有する塗膜材料によるハードマスクを形成する工程、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レジスト下層膜により半導体基板を加工する工程を経て半導体装置を製造することができる。
本発明のリソグラフィー用レジスト下層膜形成組成物では、熱安定性が高く、焼成時の分解物による上層膜への汚染が防げ、また、焼成工程の温度マージンに余裕を持たせることができるものである。
攪拌装置、還流器、温度計を備えているフラスコに9,9-ビス(4-ヒドロキシフェニル)フルオレン28.04g、4,4’-ジフルオロベンゾフェノン13.97g、炭酸カリウム12.32g、N-メチル-2-ピロリジノン162.56gを入れた。その後フラスコ内を窒素置換した後、内温が140℃まで加熱し約24時間反応させた。合成されたポリマーを室温まで冷却させた後、沈殿物を取り除くために、ろ過してろ液を回収し、N-メチル-2-ピロリジノンと2mol/l塩酸の体積比が90:10の混合液約10mlと混合させた。その後メタノールに反応ろ液を投入し再沈殿精製を行った。
さらに沈殿物を水とメタノールにて沈殿物を洗浄し、85℃で約1日真空乾燥させ本発明で用いられるポリエーテルを得た。得られたポリマーは式(3-1)に相当した。得られたエーテル構造を有するポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は6900、多分散度Mw/Mnは1.83であった。
100ml三口フラスコに6,6’-(9H-フルオレン-9,9-ジイル)ジナフタレン-2-オール6.76g、4,4’-ジフルオロベンゾフェノン3.27g、N-メチル-2-ピロリジノン42.72g、炭酸カリウム2.49gを入れた。その後フラスコ内を窒素置換した後、170℃まで加熱し約24時間反応させた。その後、N-メチル-2-ピロリジノン5.84gに溶解させた1-ナフトール0.65gを加え、さらに2時間撹拌した。反応終了後、N-メチル-2-ピロリジノン20gで希釈し、沈殿物をろ過により除去した。回収したろ液をメタノール/水/トルエン(350g/50g/30g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、ろ物を85℃で一晩減圧乾燥した。そして、薄肌色粉末のポリエーテルを7.92g得た。得られたポリマーは式(3-2)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは、9400、多分散度Mw/Mnは2.21であった。
100ml三口フラスコに4-(4-フルオロフェニルエチニル)フェノール5.09g、N-メチル-2-ピロリジノン45.84g、炭酸カリウム3.65gを入れた。その後フラスコ内を窒素置換した後、170℃まで加熱し約24時間反応させた。反応終了後、沈殿物をろ過により除去した。回収したろ液をメタノール400g混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、ろ物を85℃で一晩減圧乾燥した。そして、緑色粉末のポリエーテルを5.12g得た。得られたポリマーは式(3-3)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは、51000、多分散度Mw/Mnは5.47であった。
100ml三口フラスコにp-(3,4-ジフルオロフェニルエチニル)フェノール2.76g、9,9-ビス(4-ヒドロキシフェニル)フルオレン2.10g、N-メチル-2-ピロリジノン27.57g、炭酸カリウム3.48gを入れた。その後フラスコ内を窒素置換した後、150℃まで加熱し約6時間反応させた。反応終了後、沈殿物をろ過により除去した。回収したろ液をメタノール/水(500g/250g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、ろ物を85℃で一晩減圧乾燥した。そして、肌色粉末のポリエーテルを3.70g得た。得られたポリマーは式(3-4)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは、20000、多分散度Mw/Mnは4.49であった。
100ml三口フラスコに9,9-ビス(4-ヒドロキシフェニル)フルオレン8.06g、2,4-ジフルオロビフェニル4.81g、N-メチル-2-ピロリジノン32.35g、炭酸カリウム6.99gを入れた。その後フラスコ内を窒素置換した後、170℃まで加熱し約24時間反応させた。その後、N-メチル-2-ピロリジノン8.95gに溶解させた1-ナフトール0.99gを加え、さらに2時間撹拌した。反応終了後、沈殿物をろ過により除去した。回収したろ液をメタノール/水(160g/40g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、ろ物を85℃で一晩減圧乾燥した。そして、肌色粉末のポリエーテルを5.90g得た。得られたポリマーは式(3-5)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは1000、多分散度Mw/Mnは1.21であった。
ポリエーテル構造を有するポリマーの合成の一例として、攪拌装置、還流器、温度計を備えているフラスコに2,2-ビス(4-ヒドロキシフェニル)プロパン32.02g、4,4’-ジフルオロベンゾフェノン25.97g、炭酸カリウム21.30g、N-メチル-2-ピロリジノン237.76gを入れた。その後フラスコ内を窒素置換した後、内温が140℃まで加熱し約24時間反応させた。合成されたポリマーを室温まで冷却させた後、沈殿物を取り除くために、ろ過してろ液を回収し、N-メチル-2-ピロリジノンと2mol/l塩酸の体積比が90:10の混合液約10mlと混合させた。その後メタノール/水(体積比が90/10)混合溶液中に反応ろ液を投入し再沈殿精製を行った。
さらに沈殿物を水とメタノールにて沈殿物を洗浄し、85℃で約1日真空乾燥させ本発明で用いられるポリエーテルを得た。得られたポリマーは式(3-6)に相当した。得られたエーテル構造を有するポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は7600、多分散度Mw/Mnは1.96であった。
ポリエーテル構造を有するポリマーの合成の一例として、攪拌装置、還流器、温度計を備えているフラスコに9,9-ビス(4-ヒドロキシフェニル)フルオレン17.52g、2,6-ジフルオロベンゾニトリル6.22g、炭酸カリウム7.64g、N-メチル-2-ピロリジノン94.63gを入れた。その後フラスコ内を窒素置換した後、内温が140℃まで加熱し約24時間反応させた。合成されたポリマーを室温まで冷却させた後、沈殿物を取り除くために、ろ過してろ液を回収し、N-メチル-2-ピロリジノンと2mol/l塩酸の体積比が90:10の混合液約10mlと混合させた。その後メタノール溶液中に反応ろ液を投入し再沈殿精製を行った。
さらに沈殿物を水とメタノールにて沈殿物を洗浄し、85℃で約1日真空乾燥させ本発明で用いられるポリエーテルを19.72g得た。得られたポリマーは式(3-7)に相当した。得られたエーテル構造を有するポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は15000、多分散度Mw/Mnは2.65であった。
ポリエーテル構造を有するポリマーの合成の一例として、攪拌装置、還流器、温度計を備えているフラスコに9,9-ビス(4-ヒドロキシフェニル)フルオレン26.29g、2,5-ジフルオロニトロベンゼン11.35g、炭酸カリウム11.40g、N-メチル-2-ピロリジノン147.07gを入れた。その後フラスコ内を窒素置換した後、内温が140℃まで加熱し約24時間反応させた。合成されたポリマーを室温まで冷却させた後、沈殿物を取り除くために、ろ過してろ液を回収し、N-メチル-2-ピロリジノンと2mol/l塩酸の体積比が90:10の混合液約10mlと混合させた。その後メタノール溶液中に反応ろ液を投入し再沈殿精製を行った。
さらに沈殿物を水とメタノールにて沈殿物を洗浄し、85℃で約1日真空乾燥させ本発明で用いられるポリエーテルを28.39g得た。得られたポリマーは式(3-8)に相当した。得られたエーテル構造を有するポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は4400、多分散度Mw/Mnは1.70であった。
合成例1で得た樹脂3gに、シクロヘキサノン12gに溶解させ溶液とし、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例2で得た樹脂3gに、シクロヘキサノン12gに溶解させ溶液とし、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3で得た樹脂3gに、シクロヘキサノン12gに溶解させ溶液とし、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4で得た樹脂3gに、シクロヘキサノン12gに溶解させ溶液とし、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5で得た3gのポリマーに、シクロヘキサノン12gに溶解させ溶液とし、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6で得た3gのポリマーに、シクロヘキサノン12gに溶解させ溶液とし、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例1で得た樹脂20gに、架橋剤(日本サイテックインダストリーズ株式会社製、成分はテトラメトキシメチルグリコールウリル、式(7-1))3.0g、触媒としてパラトルエンスルホン酸0.30gを混合し、シクロヘキサノン88gに溶解させ溶液とし、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例2で得た樹脂20gに、架橋剤(日本サイテックインダストリーズ株式会社製、成分はテトラメトキシメチルグリコールウリル、式(7-1))3.0g、触媒としてピリジニウムパラトルエンスルホネート0.30g、界面活性剤としてメガファックR-30を0.06g混合し、シクロヘキサノン88gに溶解させ溶液とし、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。
クレゾールノボラック樹脂(市販品、重量平均分子量は4000)の溶液を使用した。
合成例7で得た3gのポリマーに、シクロヘキサノン12gに溶解させ溶液とし、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
分子量が1000のポリエチレングリコール(東京化成工業株式会社製)3gに、プロピレングリコールモノエチルエーテルアセテート12gに溶解させ溶液とした。
実施例1乃至10、比較例1乃至2で調製したレジスト下層膜溶液を、スピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で240℃1分間(比較例1は205℃1分間、比較例2は160℃1分間)、または400℃2分間焼成し、レジスト下層膜(膜厚0.05μm)を形成した。これらのレジスト下層膜を、分光エリプソメーターを用いて波長193nmでの屈折率(n値)及び光学吸光係数(k値、減衰係数とも呼ぶ)を測定した。結果を表1に示した。
実施例1乃至10で調製したレジスト下層膜形成組成物の溶液を、スピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で240℃1分間(比較例1は205℃1分間、比較例2は160℃1分間)、または400℃2分間焼成し、レジスト下層膜(膜厚0.20μm)を形成した。このレジスト下層膜をレジストに使用する溶剤、例えば乳酸エチル、ならびにプロピレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテルアセテート、シクロヘキサノンに対する浸漬試験を行った。
実施例1乃至6および実施例9乃至10の溶液を240℃1分間焼成した膜はそれらの溶剤に溶解したが、400℃2分間焼成した膜は、それらの溶剤に不溶であることを確認した。また、実施例7乃至8の溶液は、400℃2分間焼成した膜だけでなく、240℃1分間焼成した膜も溶剤に不溶であることを確認した。
ドライエッチング速度の測定に用いたエッチャー及びエッチングガスは以下のものを用いた。
RIE-10NR(サムコ製):CF4
実施例1乃至10、比較例1乃至2で調製したレジスト下層膜形成組成物の溶液を、スピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で240℃1分間(比較例1は205℃1分間、比較例2は160℃1分間)、または400℃2分間焼成し、レジスト下層膜(膜厚0.20μm)を形成した。エッチングガスとしてCF4ガスを使用してドライエッチング速度を測定した。
また、同様にフェノールノボラック樹脂溶液を、スピンコーターを用いてシリコンウェハー上に塗膜を形成した。エッチングガスとしてCF4ガスを使用してドライエッチング速度を測定し、実施例1乃至10、比較例1乃至2のレジスト下層膜のドライエッチング速度との比較を行った。結果を表2に示した。ドライエッチング速度比は実施例1乃至10において、(240℃焼成のレジスト下層膜)/(240℃焼成のフェノールノボラック樹脂)のドライエッチング速度比(1)と、(400℃焼成のレジスト下層膜)/(240℃焼成のフェノールノボラック樹脂)のドライエッチング速度比(2)である。
比較例2において、(160℃焼成のレジスト下層膜)/(240℃焼成のフェノールノボラック樹脂)のドライエッチング速度比(1)と、(400℃焼成のレジスト下層膜)/(240℃焼成のフェノールノボラック樹脂)のドライエッチング速度比(2)である。
実施例1乃至10、比較例1乃至2で調製したレジスト下層膜形成組成物の溶液を、スピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で400℃2分間焼成し、レジスト下層膜(膜厚0.20μm)を形成した。得られた膜を1分間で10℃の割合で加熱して大気中で熱重量分析を行い、質量が5パーセント減少する温度を測定した。結果を表3に示した。
Claims (16)
- 上記式(1)で表される単位構造を含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar1で表される有機基が、フルオレン構造を含む有機基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(2)で表される単位構造を含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar2で表される有機基が、フルオレン構造を含む有機基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(1)で表される単位構造及び上記式(2)で表される単位構造の組み合わせを含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar1及びAr2で表される有機基の少なくとも一方が、フルオレン構造を含む有機基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(1)で表される単位構造を含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar1で表される有機基が、アリーレン基と、炭素と炭素の三重結合を含む基及び/又は炭素と炭素の二重結合を含む基との組み合わせからなる有機基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(2)で表される単位構造を含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar2で表される有機基が、アリーレン基と、炭素と炭素の三重結合を含む基及び/又は炭素と炭素の二重結合を含む基との組み合わせからなる有機基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(1)で表される単位構造及び上記式(2)で表される単位構造の組み合わせを含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar1及びAr2で表される有機基の少なくとも一方が、アリーレン基と、炭素と炭素の三重結合を含む基及び/又は炭素と炭素の二重結合を含む基との組み合わせからなる有機基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(1)で表される単位構造を含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar1で表される有機基が、ビフェニレン構造を含む有機基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(2)で表される単位構造を含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar2で表される有機基が、ビフェニレン構造を含む有機基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(1)で表される単位構造及び上記式(2)で表される単位構造の組み合わせを含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar1及びAr2で表される有機基の少なくとも一方が、ビフェニレン構造を含む有機基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(2)で表される単位構造を含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar3及びAr4で表される有機基の少なくとも一方が、フェニレン基である請求項1に記載のレジスト下層膜形成組成物。
- 上記式(1)で表される単位構造及び上記式(2)で表される単位構造の組み合わせを含むポリマーを含むリソグラフィー用レジスト下層膜形成組成物であって、上記Ar3及びAr4で表される有機基の少なくとも一方が、フェニレン基である請求項1に記載のレジスト下層膜形成組成物。
- 更に酸、又は酸発生剤を含むものである請求項1乃至請求項12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13のいずれか1項に記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成することによって得られるレジスト下層膜。
- 半導体基板上に請求項1乃至請求項13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、該レジスト膜に光又は電子線を照射し、次いで現像することによりレジストパターンを形成する工程、該レジスト膜のレジストパターンに従い該下層膜をエッチングする工程、及び該パターン化された下層膜に従い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13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、該レジスト膜に光又は電子線を照射し、次いで現像することによりレジストパターンを形成する工程、該レジスト膜のレジストパターンに従いハードマスクをエッチングする工程、該パターン化されたハードマスクに従い該下層膜をエッチングする工程、及び該パターン化された下層膜に従い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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| US13/825,925 US20130189533A1 (en) | 2010-10-14 | 2011-10-07 | Resist underlayer film forming composition for lithography containing polyether structure-containing resin |
| KR1020137008102A KR101866828B1 (ko) | 2010-10-14 | 2011-10-07 | 폴리에테르 구조를 함유하는 수지를 포함하는 리소그래피용 레지스트 하층막 형성 조성물 |
| JP2012538669A JP5920588B2 (ja) | 2010-10-14 | 2011-10-07 | ポリエーテル構造を含有する樹脂を含むリソグラフィー用レジスト下層膜形成組成物 |
| US15/205,165 US9746772B2 (en) | 2010-10-14 | 2016-07-08 | Resist underlayer film forming composition for lithography containing polyether structure-containing resin |
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| US15/205,165 Division US9746772B2 (en) | 2010-10-14 | 2016-07-08 | Resist underlayer film forming composition for lithography containing polyether structure-containing resin |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2012050064A1 (ja) | 2014-02-24 |
| US9746772B2 (en) | 2017-08-29 |
| US20160320704A1 (en) | 2016-11-03 |
| KR20130129915A (ko) | 2013-11-29 |
| US20130189533A1 (en) | 2013-07-25 |
| TW201224665A (en) | 2012-06-16 |
| KR101866828B1 (ko) | 2018-06-14 |
| TWI561934B (en) | 2016-12-11 |
| JP5920588B2 (ja) | 2016-05-18 |
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