WO2012036250A1 - 感放射線性樹脂組成物、重合体及びレジストパターン形成方法 - Google Patents
感放射線性樹脂組成物、重合体及びレジストパターン形成方法 Download PDFInfo
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- WO2012036250A1 WO2012036250A1 PCT/JP2011/071163 JP2011071163W WO2012036250A1 WO 2012036250 A1 WO2012036250 A1 WO 2012036250A1 JP 2011071163 W JP2011071163 W JP 2011071163W WO 2012036250 A1 WO2012036250 A1 WO 2012036250A1
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- 0 C*C(C*)(**)C(OCC(C)(CO1)OC1=O)=O Chemical compound C*C(C*)(**)C(OCC(C)(CO1)OC1=O)=O 0.000 description 15
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
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F224/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a heterocyclic ring containing 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
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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
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
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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
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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
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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
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling 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
- G03F7/0046—Photosensitive materials with perfluoro compounds, e.g. for dry lithography
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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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/1053—Imaging affecting physical property or radiation sensitive material, or producing nonplanar or printing surface - process, composition, or product: radiation sensitive composition or product or process of making binder containing
- Y10S430/1055—Radiation sensitive composition or product or process of making
- Y10S430/114—Initiator containing
Definitions
- the present invention relates to a radiation sensitive resin composition, a polymer, and a resist pattern forming method.
- the chemically amplified radiation sensitive resin composition generates an acid in the exposed area by irradiation with far-ultraviolet rays or electron beams typified by KrF excimer laser light and ArF excimer laser light, and a chemical reaction using this acid as a catalyst.
- a difference is caused in the dissolution rate in the developer between the exposed portion and the unexposed portion, and a resist pattern is formed on the substrate.
- the positive type radiation-sensitive resin composition usually contains a polymer that becomes polar groups by elimination of a protective group by the action of an acid, and becomes alkali-soluble. As this protective group, an alicyclic hydrocarbon is contained. Those having a group have been proposed (see JP-A-9-73173).
- the miniaturization of the resist pattern is progressing to a level of 90 nm or less, not only the above-described improvement in basic characteristics such as improvement of resolution and reduction of LWR but also other performance It is becoming required. For example, as the line width of the resist pattern becomes narrower, the aspect ratio becomes larger, so that the resist pattern tends to fall down. Therefore, it is more demanded that the pattern collapse dimension, which is a limit value that the resist pattern does not collapse, is small. On the other hand, when forming a resist pattern, the film thickness of the resist film usually decreases after development.
- the present invention has been made based on the circumstances as described above, and an object thereof is to provide a radiation-sensitive resin composition having excellent LWR performance, a small pattern collapse dimension, and a large resist residual film amount. That is.
- a polymer component having a structural unit (I) represented by the following formula (1) and a structural unit (II) represented by the following formula (2) in the same or different polymers (hereinafter referred to as “ [A] Polymer component ”), [B] Radiation sensitive acid generator (hereinafter also referred to as “[B] acid generator”) and [C] Nitrogen-containing compound having a ring structure (hereinafter also referred to as “[C] compound”) A radiation-sensitive resin composition.
- R 1 is a hydrogen atom or a methyl group.
- Z is a group that forms a divalent monocyclic alicyclic hydrocarbon group together with R 2.
- R 2 is a carbon atom.
- R 3 is a methyl group or an ethyl group.
- R 4 is a hydrogen atom or a methyl group.
- X is a group that together with R 5 forms a divalent bridged alicyclic hydrocarbon group having 10 or more carbon atoms.
- R 5 is a carbon atom.
- R 6 is a branched alkyl group having 3 or 4 carbon atoms.
- the radiation-sensitive resin composition of the present invention contains an [A] polymer component, a [B] acid generator and a [C] compound, so that it has excellent LWR performance, a small pattern collapse dimension, and a resist residue.
- the amount of film can be increased.
- the structural unit (I) and the structural unit (II) of the polymer component [A] Since the acid dissociable group has high dissociation ease, the temperature of PEB (post-exposure bake) can be lowered to, for example, less than 100 ° C., and this low temperature of PEB and the appropriate basicity of the [C] compound It is conceivable that the diffusion of the acid generated from the [B] acid generator or the like is appropriately controlled by the synergistic effect.
- the polymer component preferably includes a polymer having the structural unit (I) and the structural unit (II).
- the polymer component is also preferably a mixture containing a polymer having the structural unit (I) and a polymer having the structural unit (II).
- the polymer component includes a copolymer having the structural unit (I) and the structural unit (II) or a mixture including a polymer having each structural unit,
- the radiation sensitive resin composition can exhibit the above effects.
- the structural unit (I) is preferably a structural unit (I-1) represented by the following formula (1-1).
- R 1 and R 3 have the same meanings as in Formula (1) above.
- A is 1 or 2.
- the structural unit (I) has the above specific structure, it is considered that the dissociability of the acid dissociable group is further increased when the PEB temperature is lowered. As a result, the LWR performance, the pattern collapse dimension, and the resist residual film amount Improved characteristics.
- the structural unit (II) is preferably a structural unit (II-1) represented by the following formula (2-1).
- R 4 and R 6 have the same meanings as in Formula (2) above.
- the structural unit (II) has the above specific structure, it is considered that the dissociability of the acid dissociable group is further increased when the PEB temperature is lowered. As a result, the LWR performance, the pattern collapse dimension, and the resist residual film amount The characteristics are further improved.
- the polymer component further includes at least one structural unit selected from the group consisting of a structural unit (III) having a lactone skeleton and a structural unit (IV) having a cyclic carbonate structure in the same or different polymers. It is preferable to have.
- the polymer component further has the specific structural unit, the adhesion of the resist pattern formed from the radiation-sensitive resin composition to the substrate can be improved. As a result, the LWR performance, The characteristics of the pattern collapse dimension and the residual resist film amount are further improved.
- the nitrogen-containing compound preferably has at least one ring structure selected from the group consisting of an aromatic ring structure and a nitrogen atom-containing heterocyclic structure. [C] It is considered that the nitrogen-containing compound can have an appropriate basicity by having the above specific structure, and [B] the diffusion of the acid generated from the acid generator or the like can be controlled more appropriately. . As a result, the characteristics of the LWR performance, the pattern collapse dimension, and the resist residual film amount of the radiation sensitive resin composition are further improved.
- the polymer of the present invention has a structural unit (I) represented by the following formula (1), a structural unit (II) represented by the following formula (2), and a structural unit having a cyclic carbonate structure (IV). .
- R 1 is a hydrogen atom or a methyl group.
- Z is a group that forms a divalent monocyclic alicyclic hydrocarbon group together with R 2.
- R 2 is a carbon atom.
- R 3 is a methyl group or an ethyl group.
- R 4 is a hydrogen atom or a methyl group.
- X is a group that together with R 5 forms a divalent bridged alicyclic hydrocarbon group having 10 or more carbon atoms.
- R 5 is a carbon atom.
- R 6 is a branched alkyl group having 3 or 4 carbon atoms.
- the polymer Since the polymer has the above-mentioned properties, it can be suitably used as a constituent component of the radiation-sensitive resin composition.
- the resist pattern forming method of the present invention comprises: (1) A step of applying the radiation sensitive resin composition on a substrate to form a resist film; (2) a step of exposing the resist film; (3) a step of heating the exposed resist film; and (4) a step of developing the heated resist film.
- the resist pattern forming method since the radiation sensitive resin composition is used, a resist pattern having a small PEB temperature LWR and a pattern collapse dimension can be formed while increasing the resist residual film amount.
- the present invention it is possible to provide a radiation-sensitive resin composition and a resist pattern forming method that are excellent in LWR performance, have a small pattern collapse dimension, and have a large resist residual film amount.
- the radiation-sensitive resin composition contains a [A] polymer component, a [B] generator, and a [C] compound. Moreover, the said radiation sensitive resin composition may contain a [D] solvent as a suitable component, and also may contain other arbitrary components in the range which does not impair the effect of this invention. Hereinafter, each component will be described.
- the polymer component is a polymer component having the structural unit (I) and the structural unit (II) in the same or different polymers.
- the polymer component may contain, for example, a polymer having the structural unit (I) and the structural unit (II), and the polymer having the structural unit (I) and the polymer having the structural unit (II).
- a mixture containing a coalescence may be included.
- the radiation-sensitive resin composition is excellent in LWR performance, can have a small pattern collapse dimension, and can have a large resist residual film amount.
- the polymer component is initially hardly soluble or insoluble in alkali, but both structural units (I) and (II) have a group that is dissociated by an acid generated by exposure and becomes alkali-soluble, so It has the property of becoming soluble.
- the structural unit (I) and the structural unit (II) are combined, the ease of dissociation of the acid-dissociable group is improved, and the PEB temperature can be lowered to, for example, less than 100 ° C. [B] acid generator, etc. As a result, it is considered that the resist residual film amount is improved.
- the ease of dissociation of the acid-dissociable group in this way increases the solubility of the exposed portion sufficiently, so that the pattern collapse dimension can be reduced.
- the solubility and rigidity of the exposed area after PEB and the unexposed rear area in the developing solution are appropriately set.
- the performance of the pattern collapse dimension and the resist residual film amount can be improved.
- the polymer component has a structural unit (III) having a lactone structure, a structural unit (IV) having a cyclic carbonate structure, and other structural units in addition to the structural unit (I) and the structural unit (II). It may be.
- Each structural unit may have one or more structural units. Hereinafter, each structural unit will be described.
- the structural unit (I) is a structural unit represented by the above formula (1).
- the structural unit (I) is characterized by having a specific 1-methyl-substituted monocyclic alicyclic hydrocarbon group or 1-ethyl-substituted monocyclic alicyclic hydrocarbon group.
- R ⁇ 1 > is a hydrogen atom or a methyl group.
- Z is a group that forms a divalent monocyclic alicyclic hydrocarbon group together with R 2 .
- R 2 is a carbon atom.
- R 3 is a methyl group or an ethyl group.
- R 1 is preferably a methyl group from the viewpoint of polymerizability of the monomer giving the structural unit (I).
- Examples of the divalent monocyclic alicyclic hydrocarbon group formed by Z together with R 2 include a cyclopentanediyl group, cyclohexanediyl group, cycloheptanediyl group, cyclooctanediyl group, cyclononanediyl group, cyclohexane A decanediyl group etc. are mentioned. Among these, a cyclopentanediyl group, a cyclohexanediyl group, and a cyclooctanediyl group are preferable.
- the structural unit (I) As the structural unit (I), the structural unit (I-1) represented by the above formula (1-1) is preferable.
- R 1 and R 3 have the same meaning as in the above formula (1).
- a is 1 or 2.
- the above a is preferably 1.
- the content ratio of the structural unit (I) is preferably 10 mol% to 60 mol%, more preferably 20 mol% to 60 mol%, more preferably 30 mol%, based on all structural units in the polymer component [A]. More preferably, it is -55 mol%, and 40 mol%-55 mol% is especially preferable.
- the structural unit (II) is a structural unit represented by the above formula (2).
- the structural unit (II) is characterized by having a bridged alicyclic hydrocarbon group substituted with a specific branched alkyl group.
- R ⁇ 4 > is a hydrogen atom or a methyl group.
- X is a group that together with R 5 forms a divalent bridged alicyclic hydrocarbon group having 10 or more carbon atoms.
- R 5 is a carbon atom.
- R 4 is a branched alkyl group having 3 or 4 carbon atoms.
- R 4 is preferably a methyl group from the viewpoint of polymerizability of the monomer that gives the structural unit (II).
- Examples of the divalent bridged alicyclic hydrocarbon group having 10 or more carbon atoms formed by X together with R 5 include an adamantanediyl group, a bicyclo [2.2.1] heptanediyl group, and a tricyclo [4.3. .0.1 2,5 ] decanediyl group, tetracyclo [4.4.0.1 2,5 . 1 7,10 ] dodecanediyl group and the like.
- an adamantanediyl group is preferable.
- Examples of the branched alkyl group having 3 or 4 carbon atoms represented by R 6 include i-propyl group, i-butyl group, sec-butyl group and the like. Among these, i-propyl group and i-butyl group are preferable.
- Examples of the structural unit (II) include the structural unit (II-1) represented by the above formula (2-1).
- R 4 and R 6 have the same meaning as in the above formula (2).
- the content ratio of the structural unit (II) is preferably 5 mol% to 55 mol%, more preferably 5 mol% to 35 mol%, more preferably 5 mol%, based on all structural units in the polymer component [A]. More preferred is ⁇ 20 mol%.
- the polymer component can suitably contain a structural unit (III) having a lactone structure and / or a structural unit (IV) having a cyclic carbonate structure.
- the radiation-sensitive resin composition has improved LWR performance and MEEF performance, and improved adhesion between the formed resist film and the substrate. As a result, the characteristics of the pattern collapse dimension and the resist residual film amount are also improved.
- structural unit (III) having a lactone structure examples include a structural unit represented by the following formula (3) (hereinafter also referred to as “structural unit (III-1)”).
- R 7 is a hydrogen atom or a methyl group.
- R 8 is a linear or branched alkyl group having 1 to 4 carbon atoms, a linear or branched fluorinated alkyl group having 1 to 4 carbon atoms, or a linear or branched alkyl group having 1 to 4 carbon atoms.
- A is a single bond, a divalent hydrocarbon group having 1 to 4 carbon atoms, * -A'-O-, * -A'-COO- or * -A'-OCO-.
- a ′ is a divalent hydrocarbon group having 1 to 4 carbon atoms. * Shows the site
- n is an integer of 0 to 3. If R 8 is plural, a plurality of R 8 may be the same or different.
- b is 0 or 1.
- R 7 is preferably a methyl group from the viewpoint of polymerizability of the monomer giving the structural unit (III-1).
- Examples of the linear or branched alkyl group having 1 to 4 carbon atoms represented by R 8 include a methyl group, an ethyl group, a propyl group, and a butyl group. Among these, a methyl group and an ethyl group are preferable.
- Examples of the linear or branched fluorinated alkyl group having 1 to 4 carbon atoms represented by R 8 include a trifluoromethyl group, a trifluoroethyl group, and a pentafluoroethyl group. Among these, a trifluoromethyl group is preferable.
- Examples of the linear or branched alkoxy group having 1 to 4 carbon atoms represented by R 8 include a methoxy group, an ethoxy group, a propoxy group, and a butoxy group. Among these, a methoxy group is preferable.
- Examples of the divalent hydrocarbon group having 1 to 4 carbon atoms represented by A and A ′ include a methylene group, an ethylene group, a 1,3-propylene group, a 1,4-n-butylene group and the like. Chain hydrocarbon groups; branched hydrocarbon groups such as 1,2-propylene group, 1,2-n-butylene group, 1,3-n-butylene group, 1,3-i-butylene group, etc. . Among these, a linear hydrocarbon group is preferable, and a methylene group and an ethylene group are more preferable.
- n is preferably 0 or 1.
- Examples of the structural unit (III-1) include structural units represented by the following formulas (3-1) to (3-8).
- R 7 has the same meaning as in the above formula (3).
- Examples of the structural unit (III) having the lactone structure include structural units represented by the following formulas (4-1) to (4-9) in addition to the structural unit (III-1). .
- R 9 is a hydrogen atom or a methyl group.
- Examples of the structural unit (IV) having a cyclic carbonate structure include structural units represented by the following formulas (5-1) to (5-21).
- R 10 is a hydrogen atom or a methyl group.
- the structural unit represented by the formula (5-1) is preferable.
- the content ratio of the structural unit (III) and the structural unit (IV) is usually 70 mol% or less, preferably 20 mol% to 65 mol%, based on all structural units in the polymer component [A], 30 mol% to 60 mol% is more preferable.
- the said radiation sensitive resin composition improves the adhesiveness of the LWR performance and the resist film formed, and a board
- Examples of other structural units include, for example, adamantane-1-yl (meth) acrylate, 3-methyladamantan-1-yl (meth) acrylate, 3-ethyladamantan-1-yl (meth) acrylate, (meth ) 3-hydroxyadamantan-1-yl acrylate, 3,5-dihydroxyadamantan-1-yl (meth) acrylate, 3-cyanoadamantan-1-yl (meth) acrylate, 3-carboxy (meth) acrylate Adamantan-1-yl, 3,5-dicarboxyadamantan-1-yl (meth) acrylate, 3-carboxy-5-hydroxyadamantan-1-yl (meth) acrylate, 3-methoxycarbonyl (meth) acrylate And structural units derived from monomers such as -5-hydroxyadamantan-1-yl.
- the content ratio of other structural units is preferably 0 to 20 mol% with respect to the total structural units in the polymer component [A].
- the content of the polymer component is preferably 70% by mass or more, and more preferably 80% by mass or more based on the total solid content of the radiation-sensitive resin composition.
- the polymer constituting the polymer component can be synthesized according to a conventionally known method such as radical polymerization.
- a reaction solution containing each monomer and a radical initiator can be used as a reaction solvent or a simple substance.
- a method of performing a polymerization reaction by dropping into a reaction solution containing a monomer, a reaction solution containing each monomer, and a reaction solution containing a radical initiator, each containing a reaction solvent or a monomer separately A method of dropping a solution into a polymerization reaction, a reaction solution prepared separately for each monomer and a reaction solution containing a radical initiator into a reaction solution containing a reaction solvent or a monomer separately Examples thereof include a method of dropping and causing a polymerization reaction.
- the reaction temperature in the polymerization reaction can be appropriately set depending on the type of the initiator, but is preferably 30 to 180 ° C, more preferably 40 to 160 ° C, and further preferably 50 to 140 ° C.
- the time required for dropping can be appropriately set depending on the reaction temperature, the type of initiator, and the monomer to be reacted, but is preferably 30 minutes to 8 hours, more preferably 45 minutes to 6 hours, and more preferably 1 hour to 5 hours. Is more preferable.
- the total reaction time including the dropping time can be appropriately set, but is preferably 30 minutes to 8 hours, more preferably 45 minutes to 7 hours, and further preferably 1 hour to 6 hours.
- the proportion of the monomer in the solution to be dropped is preferably 30 mol% or more, more preferably 50 mol% or more, based on the total amount of monomers used for polymerization.
- 70 mol% or more is more preferable.
- radical initiator used in the polymerization examples include 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2′-azobis (2-cyclopropylpropionitrile), 2 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobisisobutyronitrile (AIBN), 2,2′-azobis (2-methylbutyronitrile), 1,1′- Azobis (cyclohexane-1-carbonitrile), 2,2′-azobis (2-methyl-N-phenylpropionamidine) dihydrochloride, 2,2′-azobis (2-methyl-N-2-propenylpropionamidine) dihydro Chloride, 2,2′-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2′-azobi [2-Methyl-N- [1,1-bis (hydroxymethyl) 2-hydroxyethyl] propionamide], dimethyl-2,2′-
- a solvent that dissolves the monomer to be used and does not inhibit the polymerization for example, nitrobenzenes, mercapto compounds
- examples of such a solvent include alcohols, ethers, ketones, amides, esters, lactones, nitriles, and mixed solvents thereof.
- alcohols include methanol, ethanol, propanol, isopropanol, butanol, ethylene glycol, propylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, 1-methoxy-2-propanol, and the like.
- ethers include propyl ether, isopropyl ether, butyl methyl ether, tetrahydrofuran, 1,4-dioxane, 1,3-dioxolane, 1,3-dioxane and the like.
- ketones include acetone, methyl ethyl ketone, diethyl ketone, methyl isopropyl ketone, and methyl isobutyl ketone.
- amides include N, N-dimethylformamide, N, N-dimethylacetamide and the like.
- esters include ethyl acetate, methyl acetate, and isobutyl acetate.
- lactones include ⁇ -butyrolactone.
- nitriles include acetonitrile, propionitrile, butyronitrile, and the like. These solvents can be used alone or in combination of two or more.
- the polymerization reaction solution is preferably poured into a reprecipitation solvent and the target polymer is recovered as a powder.
- a reprecipitation solvent for example, water and the solvents exemplified as the reaction solvent used in the above-described polymerization reaction can be used.
- the weight average molecular weight (Mw) of the polymer component measured by gel permeation chromatography (GPC) is preferably 1,000 to 100,000, more preferably 1,500 to 80,000, More preferred is 000 to 50,000.
- Mw weight average molecular weight
- GPC gel permeation chromatography
- the polymer component used in the radiation-sensitive resin composition is more preferable as the content of impurities such as halogen and metal is smaller.
- the polymer component, and thus the content of impurities in the radiation-sensitive resin composition is smaller, the sensitivity, resolution, process stability, pattern shape and the like when a resist film is formed can be further improved.
- Examples of the purification method for the polymerization reaction solution for obtaining the polymer component include chemical purification methods such as water washing and liquid-liquid extraction, and these chemical purification methods and physical properties such as ultrafiltration and centrifugation. And a combination with a conventional purification method.
- the polymer component can be obtained by mixing one or more polymers synthesized in this way.
- the acid generator is a compound that generates an acid upon irradiation with radiation.
- Examples of the acid generator include onium salts such as sulfonium salts and iodonium salts; organic halogen compounds; sulfone compounds such as disulfones and diazomethane sulfones.
- the acid generator is preferably an onium salt, more preferably a sulfonium salt, and more preferably a sulfonium salt compound represented by the following formula (6).
- the said radiation sensitive resin composition is excellent in the point of the absorption efficiency of a radiation by containing such an acid generator.
- R 11 is a hydrogen atom, a hydroxyl group, a linear or branched alkyl group having 1 to 10 carbon atoms, a linear or branched alkoxyl group having 1 to 10 carbon atoms, or a carbon number 2 to 11 linear or branched alkoxycarbonyl groups.
- R 12 is a linear or branched alkyl group having 1 to 10 carbon atoms.
- m is an integer of 0 to 10. If R 12 is plural, plural R 12 may be the same or different.
- R 13 and R 14 are each independently a linear or branched alkyl group having 1 to 10 carbon atoms, a phenyl group, or a naphthyl group.
- R 13 and R 14 may be bonded to each other to form a ring structure having 2 to 10 carbon atoms together with the sulfur atom to which they are bonded.
- k is an integer of 0-2.
- X ⁇ is R a C x F 2x SO 3 — .
- R a is a fluorine atom or an optionally substituted hydrocarbon group having 1 to 12 carbon atoms.
- x is an integer from 1 to 10
- Examples of the linear or branched alkyl group having 1 to 10 carbon atoms represented by R 11 , R 12 , R 13 and R 14 include, for example, methyl group, ethyl group, n-propyl group, i-propyl group. Group, n-butyl group, i-butyl group, n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group and the like.
- Examples of the linear or branched alkoxyl group having 1 to 10 carbon atoms represented by R 11 include methoxy group, ethoxy group, n-propoxy group, i-propoxy group, n-butoxy group, i-butoxy group. Group, n-pentyloxy group, n-hexyloxy group and the like.
- Examples of the linear or branched alkoxycarbonyl group having 2 to 11 carbon atoms represented by R 11 include methoxycarbonyl group, ethoxycarbonyl group, n-propoxycarbonyl group, i-propoxycarbonyl group, n-butoxy group. Examples include carbonyl group, i-butoxycarbonyl group, n-pentyloxycarbonyl group, n-hexyloxycarbonyl group and the like.
- k is preferably 0 or 1.
- R a examples include linear or branched alkyl groups such as a methyl group and an ethyl group; a cyclopentyl group, a cyclohexyl group, Examples thereof include alicyclic hydrocarbon groups such as a norbornyl group and an adamantyl group.
- X is preferably 1 to 4.
- the sulfonium cation represented by the above formula (6) is preferably a cation represented by the following formula (6-1) or a cation represented by the formula (6-2) from the viewpoint of improving the radiation absorption efficiency. .
- R 15 , R 16 and R 17 are each independently a hydroxyl group, an optionally substituted linear or branched alkyl group having 1 to 12 carbon atoms or a substituted group. And an aryl group having 6 to 12 carbon atoms.
- q1, q2 and q3 are each independently an integer of 0 to 5.
- R 15, when R 16 and R 17 are a plurality of each of the plurality of R 15, R 16 and R 17 may be the same as or different from each other.
- R 18 is a hydroxyl group, a linear or branched alkyl group having 1 to 8 carbon atoms, or an aryl group having 6 to 8 carbon atoms.
- R 19 is a hydrogen atom, a linear or branched alkyl group having 1 to 7 carbon atoms, or an aryl group having 6 to 7 carbon atoms. Some or all of the hydrogen atoms of the alkyl group and aryl group may be substituted.
- q4 is an integer of 0 to 7.
- q5 is an integer of 0-6. If R 18 and R 19 are a plurality of each of the plurality of R 18 and R 19 may be the same as or different from each other. Further, two R 19 may be bonded to each other to form a ring structure.
- q6 is an integer of 0 to 3.
- Examples of the sulfonium cation represented by the above formula (6) include cations represented by the following formulas (i-1) to (i-63).
- the content of the acid generator is preferably 1 part by weight to 50 parts by weight, more preferably 2 parts by weight to 30 parts by weight, with respect to 100 parts by weight of the polymer component [A]. 20 parts by mass is more preferable.
- the acid generator can be used alone or in combination of two or more.
- the compound is a nitrogen-containing compound having a ring structure.
- This [C] compound is considered to have moderate basicity, and is considered to act as a good acid diffusion controller in the radiation-sensitive resin composition. That is, it is considered that the [C] compound controls the diffusion phenomenon in the resist film of the acid generated from the [B] acid generator or the like by exposure and suppresses an undesirable chemical reaction in the non-exposed region.
- the radiation-sensitive resin composition has excellent LWR performance and a small pattern collapse dimension, In addition, the resist residual film amount can be increased.
- the storage stability of the radiation-sensitive resin composition is improved, the resolution is improved, and the resist pattern is caused by a change in the holding time (PED) from exposure to heat treatment.
- the radiation-sensitive resin composition having excellent process stability can be obtained.
- Examples of the ring structure include nitrogen atom-containing heterocyclic structures such as aromatic ring structures, alicyclic structures, nitrogen atom-containing aliphatic heterocyclic structures, nitrogen atom-containing aromatic heterocyclic structures, and the like.
- the compound [C] has a structure in which the hydrogen atom of the amino group of the nitrogen-containing compound having an amino group is substituted with an alkoxycarbonyl group such as a t-butoxycarbonyl group, and decomposes by the action of an acid.
- generates are also contained suitably.
- [C] as a compound As a compound having an aromatic ring structure, for example, Aniline, N-methylaniline, N, N-dimethylaniline, 2-methylaniline, 3-methylaniline, 4-methylaniline, 4-nitroaniline, 2,6-dimethylaniline, 2,6-diisopropylaniline, N, N-di (hydroxyethyl) aniline, 1,3-bis [1- (4-aminophenyl) -1-methylethyl] benzenetetramethylenediamine, Nt-butoxycarbonyl-4,4′-diaminodiphenylmethane, N , N′-di-t-butoxycarbonyl-4,4′-diaminodiphenylmethane and the like.
- Monocycloalkylamines such as cyclohexyldimethylamine; dicycloalkylamines such as dicyclohexylmethylamine; tricycloalkylamines such as tricyclohexylamine and Nt-butoxycarbonyldicyclohexylamine; Nt-butoxycarbonyl-1-adamantylamine, Nt-butoxycarbonyl-2-norbornylamine, Nt-butoxycarbonyl-2-adamantylamine, Nt-butoxycarbonyl-N-methyl-1 Nt-alkoxycarbonylcycloalkylamines such as adamantylamine, N, N-di-t-butoxycarbonyl-1-adamantylamine, N, N-di-t-butoxycarbonyl-N-methyl-1-adamantylaminekind;
- the compound having a nitrogen atom-containing heterocyclic structure for example, Pyridine, 2-methylpyridine, 4-methylpyridine, 2-ethylpyridine, 4-ethylpyridine, 2-phenylpyridine, 4-phenylpyridine, 2-methyl-4-phenylpyridine, nicotine, nicotinic acid, nicotinamide, etc.
- Quinones such as quinoline, 4-hydroxyquinoline, 8-oxyquinoline; acridine, pyrazine, pyrazole, pyridazine, quinosaline, purine; imidazole, 4-methylimidazole, 1-benzyl-2-methylimidazole, 4- Imidazoles such as methyl-2-phenylimidazole; benzimidazole, 2-phenylbenzimidazole, Nt-butoxycarbonylbenzimidazole, Nt-butoxycarbonyl-2-methylbenzimidazole, Nt-butoxycarbo Compounds having a nitrogen atom-containing aromatic heterocyclic structure, such as benzimidazoles such as-2-phenylbenzimidazole; Piperazines such as piperazine, 1,4-dimethylpiperazine, N, N′-di-t-butoxycarbonylpiperazine, 1- (2-hydroxyethyl) piperazine; pyrrolidine, Nt-butoxycarbony
- compounds having an aromatic ring structure compounds having a nitrogen atom-containing heterocyclic structure are preferred, compounds having an aromatic ring structure, compounds having a nitrogen atom-containing aliphatic heterocyclic structure Are more preferable, and 2,6-diisopropylaniline and Nt-amyloxycarbonyl-4-hydroxypiperidine are more preferable.
- the basicity of the compound [C] is too high, the pattern may have a T-Top shape and the pattern collapse size may increase.
- the basicity of the [C] compound is too low, the acid diffusion control ability is insufficient, so that the diffusion of the acid to the unexposed area cannot be sufficiently suppressed, and the residual resist film amount may be reduced.
- nitrogen-containing compounds having no ring structure may be used in combination with the [C] compound.
- nitrogen-containing compounds include triethylamine, tri-n-propylamine, tri-n-butylamine, tri-n-pentylamine, tri-n-hexylamine, tri-n-heptylamine, tri-n- Tri (cyclo) alkylamines such as octylamine; alkanolamines such as triethanolamine; N, N, N ′, N′-tetramethylethylenediamine, N, N, N ′, N′-tetrakis (2-hydroxy Tertiary amine compounds such as propyl) ethylenediamine, bis (2-dimethylaminoethyl) ether, bis (2-diethylaminoethyl) ether; quaternary such as tetra-n-propylammonium hydroxide, te
- the content of the compound [C] is preferably 0.001 to 10 parts by weight, more preferably 0.1 to 5 parts by weight, and more preferably 0.001 to 10 parts by weight with respect to 100 parts by weight of the [A] polymer component. 2 parts by weight to 3 parts by weight is more preferable, and 0.5 part by weight to 2 parts by weight is particularly preferable.
- content of a [C] compound exceeds 10 mass parts, the sensitivity of the said radiation sensitive resin composition may fall. Conversely, if the content is less than 0.001 part by mass, the effect of improving the pattern collapse dimension and the like may not be sufficiently obtained.
- the radiation sensitive resin composition of the present invention usually contains a [D] solvent.
- a [D] solvent for example, Ethylene glycol monoalkyl ether acetates such as ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol mono-n-propyl ether acetate, ethylene glycol mono-n-butyl ether acetate; Propylene glycol monoalkyl ethers such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol mono-n-butyl ether; Propylene glycol dialkyl ethers such as propylene glycol dimethyl ether, propylene glycol diethyl ether, propylene glycol di-n-propyl ether, propylene glycol di-n-butyl ether; Propylene glycol monoalkyl
- Propionates such as i-propyl propionate, n-butyl propionate, i-butyl propionate, 3-methyl-3-methoxybutyl propionate; Ethyl hydroxyacetate, ethyl 2-hydroxy-2-methylpropionate, methyl 2-hydroxy-3-methylbutyrate, ethyl methoxyacetate, ethyl ethoxyacetate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, 3-ethoxy Other esters such as methyl propionate, ethyl 3-ethoxypropionate, 3-methyl-3-methoxybutyl butyrate, methyl acetoacetate, ethyl acetoacetate, methyl pyruvate, ethyl pyruvate; Aromatic hydrocarbons such as toluene and xylene; Ketones such as methyl ethyl ketone, 2-pentanone, 2-
- propylene glycol monoalkyl ether acetates, ketones and lactones are preferred, and propylene glycol monomethyl ether acetate, cyclohexanone and ⁇ -butyrolactone are more preferred.
- These [D] solvents can be used alone or in combination of two or more.
- the radiation sensitive resin composition of the present invention comprises a polymer additive, an alicyclic additive having an acid dissociable group, a surfactant, a sensitizer, an alkali-soluble resin, and a low molecule having an acid dissociable protecting group. And other optional components such as an alkali solubility control agent, an antihalation agent, a storage stabilizer, and an antifoaming agent. Other optional components can be used alone or in combination of two or more.
- the said radiation sensitive resin composition can also contain a fluorine atom containing polymer.
- the surface of the resist film is caused by the oil repellency of the fluorine atom-containing polymer.
- the distribution of the fluorine atom-containing polymer tends to increase. That is, the fluorine atom-containing polymer is unevenly distributed in the resist coating surface layer. Accordingly, it is not necessary to separately form an upper layer film for the purpose of blocking the resist film and the immersion medium, and it can be suitably used for the immersion exposure method.
- Examples of the fluorine atom-containing polymer include a fluorinated alkyl (meth) acrylate, a fluorinated alkyl (meth) acrylate having an alkoxycarbonyl group as a substituent, and a fluorinated alkyl (meth) acrylate having an alkoxy group as a substituent. And a polymer having a structural unit derived from.
- the content of the fluorine atom-containing polymer is preferably 0.5 to 15 parts by weight, more preferably 1 to 8 parts by weight with respect to 100 parts by weight of the polymer component [A].
- the alicyclic additive having an acid dissociable group is a component having an action of further improving dry etching resistance, pattern shape, adhesion to a substrate, and the like.
- Examples of such alicyclic additives include t-butyl 1-adamantanecarboxylate, t-butoxycarbonylmethyl 1-adamantanecarboxylate, di-t-butyl 1,3-adamantanedicarboxylate, and 1-adamantaneacetic acid.
- adamantane derivatives such as t-butyl, 1-adamantane acetate t-butoxycarbonylmethyl, 1,3-adamantanediacetate di-t-butyl; deoxycholate t-butyl, deoxycholate t-butoxycarbonylmethyl, deoxychol Deoxycholic acid esters such as 2-ethoxyethyl acid, 2-cyclohexyloxyethyl deoxycholic acid, 3-oxocyclohexyl deoxycholic acid, tetrahydropyranyl deoxycholic acid, mevalonolactone ester deoxycholic acid; t-butyl lithocholic acid , Lithocholic acid esters such as t-butoxycarbonylmethyl cholic acid, 2-ethoxyethyl lithocholic acid, 2-cyclohexyloxyethyl lithocholic acid, 3-oxocyclohexyl lithocholic acid, tetrahydropyranyl lithocholic
- the surfactant is a component having an action of improving coatability, striation, developability and the like.
- examples of such surfactants include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene n-octylphenyl ether, polyoxyethylene n-nonylphenyl ether, polyethylene glycol dilaurate.
- nonionic surfactants such as polyethylene glycol distearate.
- Commercially available surfactants include KP341 (manufactured by Shin-Etsu Chemical Co., Ltd.), Polyflow No. 75, no.
- the radiation-sensitive resin composition has, for example, a [A] polymer component, a [B] acid generator, a [C] compound and, if necessary, an optional component dissolved in a [D] solvent, and then having a pore size of about 200 nm. It can be obtained by filtering with a filter.
- the total solid content concentration of the radiation-sensitive resin composition is usually 1% by mass to 50% by mass, and preferably 2% by mass to 25% by mass.
- the resist pattern forming method of the present invention comprises: (1) A step of applying the radiation sensitive resin composition on a substrate to form a resist film; (2) a step of exposing the resist film; (3) a step of heating the exposed resist film; and (4) a step of developing the heated resist film.
- the PEB temperature can be lowered, and as a result, a positive resist pattern having a small LWR and a small pattern collapse dimension can be obtained. It can be formed while increasing the film amount.
- each step will be described.
- the radiation sensitive resin composition is applied onto a substrate to form a resist film.
- the resist film is formed by applying onto a substrate such as a silicon wafer or a wafer coated with aluminum by an appropriate application means such as spin coating, cast coating or roll coating. At that time, it is preferable to perform pre-baking (PB) in some cases to evaporate the solvent in the resist film.
- PB pre-baking
- an organic or inorganic antireflection film is used on the substrate to be used. Can also be formed.
- a protective film can be provided on the resist film as disclosed in, for example, Japanese Patent Laid-Open No. 5-188598. These techniques can be used in combination.
- step (2) the resist film formed in step (1) is exposed.
- the acid-dissociable group in the [A] polymer component is dissociated by the action of the acid generated from the [B] acid generator by exposure to generate a carboxyl group.
- a carboxyl group arises, the solubility with respect to the alkali developing solution in the exposed part of a resist film will become high.
- Visible rays, ultraviolet rays, far ultraviolet rays, X-rays, charged particle beams and the like can be appropriately selected as radiation used for exposure, but far ultraviolet rays are preferable, ArF excimer laser light (wavelength 193 nm), KrF excimer laser light. (Wavelength 248 nm) is more preferable, and ArF excimer laser light is particularly preferable.
- step (3) the resist film exposed in step (2) is heated. That is, post-exposure baking (PEB) is performed.
- PEB post-exposure baking
- the PEB temperature is preferably less than 100 ° C, more preferably 96 ° C or less, still more preferably 91 ° C or less, and particularly preferably 86 ° C or less.
- the PEB temperature is preferably 30 ° C. or higher, more preferably 50 ° C. or higher.
- the PEB time is preferably 5 seconds to 600 seconds, and more preferably 10 seconds to 300 seconds.
- step (4) the resist film heated in step (3) is developed. That is, a positive resist pattern can be formed by dissolving and removing the exposed portion of the exposed resist film with an alkali developer. In addition, after developing with the said developing solution, it is preferable to wash
- Examples of the developer include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, aqueous ammonia, ethylamine, n-propylamine, diethylamine, di-n-propylamine, triethylamine, methyl Diethylamine, ethyldimethylamine, triethanolamine, tetramethylammonium hydroxide, pyrrole, piperidine, choline, 1,8-diazabicyclo- [5.4.0] -7-undecene and 1,5-diazabicyclo- [4.3 0.0] -5-nonene is preferred, an alkaline aqueous solution in which at least one alkaline compound is dissolved.
- the concentration of the alkaline aqueous solution is preferably 10% by mass or less. When the concentration of the alkaline aqueous solution exceeds 10% by mass, the unexposed area may be dissolved in the developer.
- the developer may contain, for example, an organic solvent.
- organic solvent include ketones such as acetone, methyl ethyl ketone, methyl i-butyl ketone, cyclopentanone, cyclohexanone, 3-methylcyclopentanone, and 2,6-dimethylcyclohexanone; methyl alcohol, ethyl alcohol, n-propyl Alcohols such as alcohol, i-propyl alcohol, n-butyl alcohol, t-butyl alcohol, cyclopentanol, cyclohexanol, 1,4-hexanediol and 1,4-hexanedimethylol; ethers such as tetrahydrofuran and dioxane Esters such as ethyl acetate, n-butyl acetate and i-amyl acetate; aromatic hydrocarbons such as toluene and xylene; phenol, acetonylace
- the content of the organic solvent is preferably 100% by volume or less with respect to the alkaline aqueous solution.
- the content of the organic solvent exceeds 100% by volume, the developability is lowered, and there is a possibility that the development residue in the exposed area increases.
- an appropriate amount of the above-described surfactant or the like can be added to the developer.
- the polymer of the present invention comprises a structural unit (I) represented by the above formula (1), a structural unit (II) represented by the above formula (2) and a structural unit (IV) comprising a cyclic carbonate structure. It is a coalescence. Since the polymer has each of these structural units and has the above-described characteristics, it can be suitably used as a constituent component of the radiation-sensitive resin composition, and has an LWR performance, a pattern collapse dimension, and a resist. This contributes to the characteristics of the remaining film amount and the adhesion of the resist pattern to the substrate.
- the content ratio of the structural unit (IV) containing a cyclic carbonate structure in the polymer is usually 70 mol% or less, preferably 10 mol% to 65 mol%, based on all the structural units in the polymer. More preferably, mol% to 50 mol% is more preferable, and 10 mol% to 35 mol% is even more preferable.
- Mw and Mn of polymer component Mw and Mn measurement of polymer components were performed by gel permeation chromatography (GPC) using a GPC column (manufactured by Tosoh Corporation, two G2000HXL, one G3000HXL, one G4000HXL), a flow rate of 1.0 mL / min, and an elution solvent. Measurement was performed using monodisperse polystyrene as a standard under the analysis conditions of tetrahydrofuran and a column temperature of 40 ° C.
- the inside of the flask was heated to 80 ° C. while stirring with a magnetic stirrer. Using the dropping funnel, the monomer solution prepared above was added dropwise over 3 hours. The polymerization start was carried out for 6 hours with the start of dropping as the polymerization start time. After completion of the polymerization, the polymerization reaction solution was cooled to 30 ° C. or less by water cooling. After cooling, it was poured into 2,000 g of methanol, and the precipitated white powder was filtered off. The filtered white powder was slurried with 400 g of methanol and washed twice. Thereafter, the mixture was filtered and dried at 60 ° C.
- This polymer (A-3) had an Mw of 11,800 and an Mw / Mn of 1.49.
- the content ratio of the structural unit derived from (M-2): the structural unit derived from (M-3): the structural unit derived from (M-7) was 49.1: 8. 3: 42.6 (mol%).
- This polymer (A-4) had Mw of 11,000 and Mw / Mn of 1.40. Further, as a result of 13 C-NMR analysis, structural unit derived from (M-1): structural unit derived from (M-3): structural unit derived from (M-6): structural unit derived from (M-7) Each content rate was 43.9: 8.3: 19.8: 28.0 (mol%).
- This polymer (A-5) had an Mw of 11,800 and an Mw / Mn of 1.48.
- structural unit derived from (M-2) structural unit derived from (M-3): structural unit derived from (M-6): structural unit derived from (M-7)
- Each content rate was 43.9: 8.3: 19.8: 28.0 (mol%).
- the polymerization reaction solution was cooled to 30 ° C. or less by water cooling. After cooling, the flask contents were concentrated to 150 g, and poured into a mixed solution of 1,125 g of methanol and 125 g of water, and the deposited precipitate was recovered.
- B-1 4-cyclohexylphenyldiphenylsulfonium nonafluoro-n-butane-1-sulfonate
- B-2 triphenylsulfonium 2- (adamantan-1-yl) -1,1-difluoroethane-1-sulfonate
- B-3 Triphenylsulfonium 2-bicyclo [2.2.1] hept-2-yl-1,1,2,2-tetrafluoroethane-1-sulfonate
- [Example 3] [A] 100 parts by mass of (A-1) as a polymer component, [B] 4 parts by mass of (B-1), (B-2) 4 parts by mass and (B-3) 4 parts by mass as an acid generator Part, (C-1) 1 part by weight as the [C] compound, (D-1) 2,600 parts by weight as the solvent [D], (D-2) 1,100 parts by weight and (D-3) 15 parts by mass and 7 parts by mass of (E-1) as a [E] fluorine atom-containing polymer are mixed and filtered through a filter having a pore size of 0.20 ⁇ m to prepare a radiation sensitive resin composition (J-1). did.
- Examples 4 to 11 and Comparative Examples 1 to 6 Except for using the components of the types and blending amounts shown in Table 1 below, the radiation-sensitive resin compositions (J-2) to (J-9) of the Examples and Comparative Examples were the same as in Example 3. (CJ-1) to (CJ-6) were prepared. “-” In Table 1 indicates that the corresponding component was not used.
- Resist patterns were formed using the radiation sensitive resin compositions of Examples and Comparative Examples prepared above and using the pattern forming method shown in Table 2 below.
- a silicon wafer As the substrate, a silicon wafer was used in which a two-layer resist underlayer film composed of a CTL53 (manufactured by JSR) film having a film thickness of 230 nm and an SOG508 (manufactured by JSR) film having a film thickness of 45 nm was formed on the silicon wafer surface.
- PB was performed on a hot plate at 110 ° C. for 60 seconds to form a resist film having a thickness of 100 nm.
- This resist film was exposed through a mask pattern using an immersion ArF excimer laser exposure apparatus (S610C, manufactured by Nikon (numerical aperture 1.30)). Thereafter, PEB was performed for 60 seconds at the PEB temperature shown in Table 2, and then developed with a 2.38 mass% tetramethylammonium hydroxide aqueous solution at 23 ° C. for 4 seconds, washed with water and dried to form a positive resist. A pattern was formed.
- Example 4 In the same manner as in the pattern forming method 1, after two resist underlayer films and a resist film are formed on the silicon wafer surface, TCX091 (manufactured by JSR) is spin-coated on the formed resist film as an immersion upper layer film. A film having a thickness of 90 nm was formed by heating at 60 ° C. for 60 seconds. Subsequently, the film was exposed through a mask pattern using the immersion ArF excimer laser exposure apparatus. Thereafter, PEB was performed at 95 ° C. for 60 seconds, followed by development with an aqueous 2.38 mass% tetramethylammonium hydroxide solution at 23 ° C. for 4 seconds, washing with water and drying to form a positive resist pattern.
- TCX091 manufactured by JSR
- the exposure amount for forming a line-and-space pattern (1L / 1S) having a line width of 40 nm in a one-to-one line width was determined as the optimum exposure amount.
- the radiation sensitive resin composition of the present invention As shown in Table 2, according to the radiation sensitive resin composition of the present invention, sufficient deprotection reaction of the acid dissociable group occurs even under a low temperature PEB as compared with the radiation sensitive resin composition of the comparative example. In addition, it is considered that the acid diffusion length can be suppressed by using the [C] compound. As a result, a resist pattern having excellent LWR performance, a small pattern collapse dimension, and a large resist residual film amount is formed. be able to.
- the radiation sensitive resin composition having excellent LWR performance, a small pattern collapse dimension, and a large resist residual film amount. Therefore, the radiation sensitive resin composition can be suitably used as a chemically amplified resist used in the manufacture of semiconductor devices and the like that will be increasingly miniaturized in the future.
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Abstract
Description
[A]同一又は異なる重合体中に、下記式(1)で表される構造単位(I)と下記式(2)で表される構造単位(II)とを有する重合体成分(以下、「[A]重合体成分」ともいう)、
[B]感放射線性酸発生剤(以下、「[B]酸発生剤」ともいう)、及び
[C]環構造を有する窒素含有化合物(以下、「[C]化合物」ともいう)
を含有する感放射線性樹脂組成物。
式(2)中、R4は、水素原子又はメチル基である。Xは、R5と共に炭素数10以上の2価の有橋の脂環式炭化水素基を形成する基である。R5は、炭素原子である。R6は、炭素数3又は4の分岐状のアルキル基である。)
式(2)中、R4は、水素原子又はメチル基である。Xは、R5と共に炭素数10以上の2価の有橋の脂環式炭化水素基を形成する基である。R5は、炭素原子である。R6は、炭素数3又は4の分岐状のアルキル基である。)
(1)当該感放射線性樹脂組成物を基板上に塗布し、レジスト被膜を形成する工程、
(2)上記レジスト被膜を露光する工程、
(3)上記露光されたレジスト被膜を加熱する工程、及び
(4)上記加熱されたレジスト被膜を現像する工程
を有する。
<感放射線性樹脂組成物>
当該感放射線性樹脂組成物は、[A]重合体成分、[B]発生剤及び[C]化合物を含有する。また、当該感放射線性樹脂組成物は、好適成分として[D]溶媒を含有してもよく、さらに、本発明の効果を損なわない範囲において、その他の任意成分を含有してもよい。以下、各成分について説明する。
[A]重合体成分は、同一又は異なる重合体中に、構造単位(I)と構造単位(II)とを有する重合体成分である。[A]重合体成分は、例えば、構造単位(I)及び構造単位(II)を有する重合体を含んでいてもよく、構造単位(I)を有する重合体と構造単位(II)を有する重合体とを含む混合物を含んでいてもよい。[A]重合体成分における両構造単位の含有形態にかかわらず、当該感放射線性樹脂組成物は、LWR性能に優れると共に、パターン倒れ寸法を小さく、かつレジスト残膜量を大きくすることができる。
構造単位(I)は、上記式(1)で表される構造単位である。構造単位(I)は、特定の1-メチル置換の単環の脂環式炭化水素基又は1-エチル置換の単環の脂環式炭化水素基を有することを特徴とする。
式(1)中、Zは、R2と共に2価の単環の脂環式炭化水素基を形成する基である。R2は、炭素原子である。R3は、メチル基又はエチル基である。
構造単位(II)は、上記式(2)で表される構造単位である。構造単位(II)は、特定の分岐状アルキル基で置換された有橋脂環式炭化水素基を有することを特徴とする。
[A]重合体成分は、ラクトン構造を有する構造単位(III)及び/又は環状カーボネート構造を有する構造単位(IV)を好適に含有することができる。[A]重合体成分がこのような構造単位を有することにより、当該感放射線性樹脂組成物は、LWR性能及びMEEF性能が向上すると共に、形成されるレジスト被膜と基板との密着性が向上するので、その結果、パターン倒れ寸法及びレジスト残膜量の特性も向上する。
その他の構造単位としては、例えば、(メタ)アクリル酸アダマンタン-1-イル、(メタ)アクリル酸3-メチルアダマンタン-1-イル、(メタ)アクリル酸3-エチルアダマンタン-1-イル、(メタ)アクリル酸3-ヒドロキシアダマンタン-1-イル、(メタ)アクリル酸3,5-ジヒドロキシアダマンタン-1-イル、(メタ)アクリル酸3-シアノアダマンタン-1-イル、(メタ)アクリル酸3-カルボキシアダマンタン-1-イル、(メタ)アクリル酸3,5-ジカルボキシアダマンタン-1-イル、(メタ)アクリル酸3-カルボキシ-5-ヒドロキシアダマンタン-1-イル、(メタ)アクリル酸3-メトキシカルボニル-5-ヒドロキシアダマンタン-1-イル等の単量体に由来する構造単位等が挙げられる。
[A]重合体成分を構成する重合体は、ラジカル重合等の従来公知の方法に従って合成することができるが、例えば、各単量体とラジカル開始剤を含有する反応溶液を、反応溶媒又は単量体を含有する反応溶液に滴下して重合反応させる方法、各単量体を含有する反応溶液とラジカル開始剤を含有する反応溶液とを、各々別々に反応溶媒又は単量体を含有する反応溶液に滴下して重合反応させる方法、各単量体も各々別々に調製された反応溶液とラジカル開始剤を含有する反応溶液とを、各々別々に反応溶媒又は単量体を含有する反応溶液に滴下して重合反応させる方法等が挙げられる。
エーテル類としては、例えば、プロピルエーテル、イソプロピルエーテル、ブチルメチルエーテル、テトラヒドロフラン、1,4-ジオキサン、1,3-ジオキソラン、1,3-ジオキサン等が挙げられる。
ケトン類としては、例えば、アセトン、メチルエチルケトン、ジエチルケトン、メチルイソプロピルケトン、メチルイソブチルケトン等が挙げられる。
アミド類としては、例えば、N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド等が挙げられる。
エステル類としては、例えば、酢酸エチル、酢酸メチル、酢酸イソブチル等が挙げられる。
ラクトン類としては、例えば、γ-ブチロラクトン等が挙げられる。
ニトリル類としては、例えば、アセトニトリル、プロピオニトリル、ブチロニトリル等が挙げられる。これらの溶媒は、1種単独又は2種以上を使用することができる。
[B]酸発生剤は、放射線の照射により酸を発生する化合物である。[B]酸発生剤としては、スルホニウム塩、ヨードニウム塩等のオニウム塩;有機ハロゲン化合物;ジスルホン類、ジアゾメタンスルホン類等のスルホン化合物等が挙げられる。
R11で表される炭素数1~10の直鎖状若しくは分岐状のアルコキシル基としては、例えば、メトキシ基、エトキシ基、n-プロポキシ基、i-プロポキシ基、n-ブトキシ基、i-ブトキシ基、n-ペンチルオキシ基、n-ヘキシルオキシ基等が挙げられる。
R11で表される炭素数2~11の直鎖状若しくは分岐状のアルコキシカルボニル基としては、例えば、メトキシカルボニル基、エトキシカルボニル基、n-プロポキシカルボニル基、i-プロポキシカルボニル基、n-ブトキシカルボニル基、i-ブトキシカルボニル基、n-ペンチルオキシカルボニル基、n-ヘキシルオキシカルボニル基等が挙げられる。
上記Raで表される置換されていてもよい炭素数1~12の炭化水素基としては、例えば、メチル基、エチル基等の直鎖状又は分岐状のアルキル基;シクロペンチル基、シクロヘキシル基、ノルボルニル基、アダマンチル基等の脂環式炭化水素基等が挙げられる。
上記xとしては、1~4が好ましい。
上記式(6-2)中、R18は、水酸基、炭素数1~8の直鎖状若しくは分岐状のアルキル基又は炭素数6~8のアリール基である。このアルキル基及びアリール基が有する水素原子の一部又は全部は置換されていてもよい。R19は、水素原子、炭素数1~7の直鎖状若しくは分岐状のアルキル基又は炭素数6~7のアリール基である。このアルキル基及びアリール基が有する水素原子の一部又は全部は置換されていてもよい。q4は、0~7の整数である。q5は、0~6の整数である。R18及びR19がそれぞれ複数の場合、複数のR18及びR19はそれぞれ同一でも異なっていてもよい。また、2つのR19が互いに結合して環構造を形成してもよい。q6は、0~3の整数である。
[C]化合物は、環構造を有する窒素含有化合物である。この[C]化合物は、適度な塩基性を有していると考えられ、当該感放射線性樹脂組成物において、良好な酸拡散制御剤として作用すると考えられる。すなわち、[C]化合物は、露光により[B]酸発生剤等から生じる酸のレジスト被膜中における拡散現象を制御し、非露光領域における好ましくない化学反応を抑制すると考えられる。その結果、[A]重合体成分の酸解離性基の解離容易性向上によるPEB低温化との相乗効果として、当該感放射線性樹脂組成物は、LWR性能に優れると共に、パターン倒れ寸法を小さく、かつレジスト残膜量を大きくすることができる。また、[C]化合物を含有させることで、当該感放射線性樹脂組成物の貯蔵安定性が向上し、解像度が向上すると共に、露光から加熱処理までの引き置き時間(PED)の変動によるレジストパターンの線幅変化を抑えることができ、プロセス安定性に優れた感放射線性樹脂組成物を得ることができる。
芳香環構造を有する化合物として、例えば、
アニリン、N-メチルアニリン、N,N-ジメチルアニリン、2-メチルアニリン、3-メチルアニリン、4-メチルアニリン、4-ニトロアニリン、2,6-ジメチルアニリン、2,6-ジイソプロピルアニリン、N,N-ジ(ヒドロキシエチル)アニリン、1,3-ビス[1-(4-アミノフェニル)-1-メチルエチル]ベンゼンテトラメチレンジアミン、N-t-ブトキシカルボニル-4,4’-ジアミノジフェニルメタン、N,N’-ジ-t-ブトキシカルボニル-4,4’-ジアミノジフェニルメタン等が挙げられる。
シクロヘキシルジメチルアミン等のモノシクロアルキルアミン類;ジシクロヘキシルメチルアミン等のジシクロアルキルアミン類;トリシクロヘキシルアミン、N-t-ブトキシカルボニルジシクロヘキシルアミン等のトリシクロアルキルアミン類;
N-t-ブトキシカルボニル-1-アダマンチルアミン、N-t-ブトキシカルボニル-2-ノルボルニルアミン、N-t-ブトキシカルボニル-2-アダマンチルアミン、N-t-ブトキシカルボニル-N-メチル-1-アダマンチルアミン、N,N-ジ-t-ブトキシカルボニル-1-アダマンチルアミン、N,N-ジ-t-ブトキシカルボニル-N-メチル-1-アダマンチルアミン等のN-t-アルコキシカルボニルシクロアルキルアミン類;
ピリジン、2-メチルピリジン、4-メチルピリジン、2-エチルピリジン、4-エチルピリジン、2-フェニルピリジン、4-フェニルピリジン、2-メチル-4-フェニルピリジン、ニコチン、ニコチン酸、ニコチン酸アミド等のピリジン類;キノリン、4-ヒドロキシキノリン、8-オキシキノリン等のキノリン類;アクリジン、ピラジン、ピラゾール、ピリダジン、キノザリン、プリン;イミダゾール、4-メチルイミダゾール、1-ベンジル-2-メチルイミダゾール、4-メチル-2-フェニルイミダゾール等のイミダゾール類;ベンズイミダゾール、2-フェニルベンズイミダゾール、N-t-ブトキシカルボニルベンズイミダゾール、N-t-ブトキシカルボニル-2-メチルベンズイミダゾール、N-t-ブトキシカルボニル-2-フェニルベンズイミダゾール等のベンズイミダゾール類などの窒素原子含有芳香族複素環構造を有する化合物;
ピペラジン、1,4-ジメチルピペラジン、N、N’-ジ-t-ブトキシカルボニルピペラジン、1-(2-ヒドロキシエチル)ピペラジン等のピペラジン類;ピロリジン、N-t-ブトキシカルボニルピロリジン、(S)-(-)-1-(t-ブトキシカルボニル)-2-ピロリジンメタノール、(R)-(+)-1-(t-ブトキシカルボニル)-2-ピロリジンメタノール等のピロリジン類;ピペリジン、N-t-ブトキシカルボニル--4-ヒドロキシピペリジン、N-t-アミロキシ-4-ヒドロキシピペリジン、3-ピペリジノ-1,2-プロパンジオール等のピペリジン類;モルホリン、4-メチルモルホリン等のモルホリン類;1,4-ジアザビシクロ[2.2.2]オクタン等の窒素原子含有脂肪族複素環構造を有する化合物が挙げられる。
本発明の感放射線性樹脂組成物は、通常、[D]溶媒を含有する。
[D]溶媒としては、例えば、
エチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、エチレングリコールモノ-n-プロピルエーテルアセテート、エチレングリコールモノ-n-ブチルエーテルアセテート等のエチレングリコールモノアルキルエーテルアセテート類;
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エチルエーテル、プロピレングリコールモノ-n-プロピルエーテル、プロピレングリコールモノ-n-ブチルエーテル等のプロピレングリコールモノアルキルエーテル類;
プロピレングリコールジメチルエーテル、プロピレングリコールジエチルエーテル、プロピレングリコールジ-n-プロピルエーテル、プロピレングリコールジ-n-ブチルエーテル等のプロピレングリコールジアルキルエーテル類;
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アセテート、プロピレングリコールモノ-n-プロピルエーテルアセテート、プロピレングリコールモノ-n-ブチルエーテルアセテート等のプロピレングリコールモノアルキルエーテルアセテート類;
乳酸メチル、乳酸エチル、乳酸n-プロピル、乳酸i-プロピル等の乳酸エステル類;
ぎ酸n-アミル、ぎ酸i-アミル等のぎ酸エステル類;
酢酸エチル、酢酸n-プロピル、酢酸i-プロピル、酢酸n-ブチル、酢酸i-ブチル、酢酸n-アミル、酢酸i-アミル、3-メトキシブチルアセテート、3-メチル-3-メトキシブチルアセテート等の酢酸エステル類;
プロピオン酸i-プロピル、プロピオン酸n-ブチル、プロピオン酸i-ブチル、3-メチル-3-メトキシブチルプロピオネート等のプロピオン酸エステル類;
ヒドロキシ酢酸エチル、2-ヒドロキシ-2-メチルプロピオン酸エチル、2-ヒドロキシ-3-メチル酪酸メチル、メトキシ酢酸エチル、エトキシ酢酸エチル、3-メトキシプロピオン酸メチル、3-メトキシプロピオン酸エチル、3-エトキシプロピオン酸メチル、3-エトキシプロピオン酸エチル、3-メチル-3-メトキシブチルブチレート、アセト酢酸メチル、アセト酢酸エチル、ピルビン酸メチル、ピルビン酸エチル等の他のエステル類;
トルエン、キシレン等の芳香族炭化水素類;
メチルエチルケトン、2-ペンタノン、2-ヘキサノン、2-ヘプタノン、3-ヘプタノン、4-ヘプタノン、シクロヘキサノン等のケトン類;
N-メチルホルムアミド、N,N-ジメチルホルムアミド、N-メチルアセトアミド、N,N-ジメチルアセトアミド、N-メチルピロリドン等のアミド類;
γ-ブチロラクン等のラクトン類等が挙げられる。
本発明の感放射線性樹脂組成物は、高分子添加剤、酸解離性基を有する脂環族添加剤、界面活性剤、増感剤、アルカリ可溶性樹脂、酸解離性の保護基を有する低分子のアルカリ溶解性制御剤、ハレーション防止剤、保存安定化剤、消泡剤等のその他の任意成分をさらに含有することができる。その他の任意成分は、それぞれ1種又は2種以上用いることができる。
当該感放射線性樹脂組成物は、フッ素原子含有重合体を含有することもできる。[A]重合体成分とフッ素原子含有重合体とを含有する感放射線性樹脂組成物用いて、レジスト被膜を形成した場合、フッ素原子含有重合体の撥油性に起因して、レジスト被膜の表面においてフッ素原子含有重合体の分布が高くなる傾向がある。すなわち、フッ素原子含有重合体が、レジスト被膜表層に偏在する。従って、レジスト被膜と液浸媒体を遮断することを目的とした上層膜を別途形成する必要がなく、液浸露光法に好適に用いることができる。
酸解離性基を有する脂環族添加剤は、ドライエッチング耐性、パターン形状、基板との接着性等をさらに改善する作用を有する成分である。このような脂環族添加剤としては、例えば、1-アダマンタンカルボン酸t-ブチル、1-アダマンタンカルボン酸t-ブトキシカルボニルメチル、1,3-アダマンタンジカルボン酸ジ-t-ブチル、1-アダマンタン酢酸t-ブチル、1-アダマンタン酢酸t-ブトキシカルボニルメチル、1,3-アダマンタンジ酢酸ジ-t-ブチル等のアダマンタン誘導体類;デオキシコール酸t-ブチル、デオキシコール酸t-ブトキシカルボニルメチル、デオキシコール酸2-エトキシエチル、デオキシコール酸2-シクロヘキシルオキシエチル、デオキシコール酸3-オキソシクロヘキシル、デオキシコール酸テトラヒドロピラニル、デオキシコール酸メバロノラクトンエステル等のデオキシコール酸エステル類;リトコール酸t-ブチル、リトコール酸t-ブトキシカルボニルメチル、リトコール酸2-エトキシエチル、リトコール酸2-シクロヘキシルオキシエチル、リトコール酸3-オキソシクロヘキシル、リトコール酸テトラヒドロピラニル、リトコール酸メバロノラクトンエステル等のリトコール酸エステル類等が挙げられる。
界面活性剤は、塗布性、ストリエーション及び現像性等を改良する作用を有する成分である。このような界面活性剤としては、例えば、ポリオキシエチレンラウリルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンオレイルエーテル、ポリオキシエチレンn-オクチルフェニルエーテル、ポリオキシエチレンn-ノニルフェニルエーテル、ポリエチレングリコールジラウレート、ポリエチレングリコールジステアレート等のノニオン系界面活性剤等が挙げられる。界面活性剤の市販品としては、KP341(信越化学工業製)、ポリフローNo.75、同No.95(共栄社化学製)、エフトップEF301、同EF303、同EF352(トーケムプロダクツ製)、メガファックF171、同F173(大日本インキ化学工業製)、フロラードFC430、同FC431(住友スリーエム製)、アサヒガードAG710、サーフロンS-382、同SC-101、同SC-102、同SC-103、同SC-104、同SC-105、同SC-106(旭硝子製)等が挙げられる。
当該感放射線性樹脂組成物は、例えば、[A]重合体成分、[B]酸発生剤、[C]化合物及び必要に応じて任意成分を[D]溶媒に溶解した後、孔径200nm程度のフィルターでろ過することにより得ることができる。当該感放射線性樹脂組成物の全固形分濃度としては、通常、1質量%~50質量%であり、2質量%~25質量%が好ましい。
本発明のレジストパターン形成方法は、
(1)当該感放射線性樹脂組成物を基板上に塗布し、レジスト被膜を形成する工程、
(2)上記レジスト被膜を露光する工程、
(3)露光された上記レジスト被膜を加熱する工程、及び
(4)上記加熱されたレジスト被膜を現像する工程
を有する。このレジストパターン形成方法によれば、当該感放射線性樹脂組成物を用いているので、PEB温度を低くすることができ、その結果、LWR及びパターン倒れ寸法が小さいポジ型のレジストパターンを、レジスト残膜量を大きくしつつ形成することができる。以下、各工程について説明する。
(1)工程では、当該感放射線性樹脂組成物を基板上に塗布し、レジスト被膜を形成する。回転塗布、流延塗布、ロール塗布等の適宜の塗布手段によって、例えば、シリコンウェハ、アルミニウムで被覆されたウェハ等の基板上に塗布することによりレジスト被膜を形成する。その際、場合によりプレベーク(PB)を行ってレジスト被膜中の溶媒を蒸発させることが好ましい。
(2)工程では、(1)工程で形成したレジスト被膜を露光する。露光により[B]酸発生剤から発生した酸の作用で[A]重合体成分中の酸解離性基を解離させ、カルボキシル基を生じさせる。カルボキシル基が生じると、レジスト被膜の露光部におけるアルカリ現像液に対する溶解性が高くなる。露光に用いられる放射線としては、可視光線、紫外線、遠紫外線、X線、荷電粒子線等を適宜選定することができるが、遠紫外線が好ましく、ArFエキシマレーザー光(波長193nm)、KrFエキシマレーザー光(波長248nm)がより好ましく、特にArFエキシマレーザー光が好ましい。
(3)工程では、(2)工程で露光されたレジスト被膜を加熱する。すなわち、ポストエクスポージャーベーク(PEB)を行う。このPEBにより、レジスト被膜中の酸解離性基の解離反応が円滑に進行する。このPEB温度としては、100℃未満が好ましく、96℃以下がより好ましく、91℃以下がさらに好ましく、86℃以下が特に好ましい。また、PEB温度は、30℃以上が好ましく、50℃以上がより好ましい。PEB温度を上記範囲とすることにより、[C]化合物の酸拡散制御効果との相乗効果として、[B]酸発生剤等から発生する酸の拡散長を適度に短くすることができる。その結果、形成されるレジストパターンのLWR及びパターン倒れ寸法を小さくすることができ、かつレジスト残膜量を大きくすることができる。PEB時間としては、5秒~600秒が好ましく、10秒~300秒がより好ましい。
(4)工程では、(3)工程で加熱されたレジスト被膜を現像する。すなわち、露光されたレジスト被膜の露光部をアルカリ現像液によって溶解、除去することによって、ポジ型のレジストパターンを形成することができる。なお、上記現像液で現像した後、水で洗浄して乾燥することが好ましい。
本発明の重合体は、上記式(1)で表される構造単位(I)、上記式(2)で表される構造単位(II)及び環状カーボネート構造を含む構造単位(IV)を有する重合体である。当該重合体は、これらの各構造単位を有しており上述した特性を有しているので、感放射線性樹脂組成物の構成成分として好適に用いることができ、LWR性能、パターン倒れ寸法及びレジスト残膜量の特性並びにレジストパターンの基板への密着性に寄与する。
重合体成分のMw及びMn測定は、ゲルパーミエーションクロマトグラフィー(GPC)により、GPCカラム(東ソー製、G2000HXL 2本、G3000HXL 1本、G4000HXL 1本)を用い、流量1.0mL/分、溶出溶媒テトラヒドロフラン、カラム温度40℃の分析条件で、単分散ポリスチレンを標準として測定した。
重合体の13C-NMR分析は、核磁気共鳴装置(JNM-ECX400、日本電子製)を使用し測定した。
[A]重合体成分及び[E]フッ素原子含有重合体の合成に用いた単量体を以下に示す。
下記にそれぞれの構造式を示す。
M-1:1-メチルシクロペンチルメタクリレート
M-2:1-エチルシクロペンチルメタクリレート
M-3:1-イソプロピルアダマンチルメタクリレート
M-4:1-エチルアダマンチルメタクリレート
M-5:1-メチルアダマンチルメタクリレート
M-6:2-オキソ-1,3-ジオキソラン-4-イルメタクリレート
M-7:4-オキサ-5-オキソトリシクロ[4,2,1,03,7]ノナン-2-イルメタクリレート
M-8:1-メトキシカルボニル-1,1-ジフルオロ-2-ブチルメタクリレート
[合成例1](重合体(A-1)の合成)
上記単量体(M-1)37.49g(45モル%)及び単量体(M-7)49.52g(45モル%)を2-ブタノン200gに溶解し、さらに開始剤としてのAIBN1.63g(単量体の総モル数に対して2モル%)を溶解した単量体溶液を調製した。
次に、温度計及び滴下漏斗を備えた1,000mLの三口フラスコに、100gの2-ブタノン及び単量体(M-3)12.99g(10モル%)を仕込み、30分窒素パージした。窒素パージの後、フラスコ内をマグネティックスターラーで攪拌しながら80℃になるように加熱した。滴下漏斗を用い、上記調製した単量体溶液を3時間かけて滴下した。滴下開始時を重合開始時間とし、重合反応を6時間実施した。重合終了後、重合反応液を水冷により30℃以下に冷却した。冷却後、2,000gのメタノールへ投入し、析出した白色粉末をろ別した。ろ別された白色粉末を400gのメタノールにてスラリー状にして2回洗浄した。その後、ろ別し、60℃にて18時間乾燥し、白色粉末の重合体(A-1)を得た(80.3g、収率80%)。この重合体(A-1)は、Mwが11,500であり、Mw/Mnが1.47であった。また、13C-NMR分析の結果、(M-1)由来の構造単位:(M-3)由来の構造単位:(M-7)由来の構造単位の各含有割合は、44.5:8.5:47.0(モル%)であった。
三口フラスコに100gの2-ブタノン及び単量体(M-3)12.81g(10モル%)を仕込み、滴下する単量体溶液として、上記単量体(M-1)20.54g(25モル%)、(M-2)17.80g(20モル%)、(M-7)48.84g(45モル%)及びAIBN1.60g(2モル%)を2-ブタノン100gに溶解した溶液を用いた以外は合成例1と同様にして白色粉末の重合体(A-2)を得た(81.8g、収率82%)。この重合体(A-2)は、Mwが11,200であり、Mw/Mnが1.41であった。また、13C-NMR分析の結果、(M-1)由来の構造単位:(M-2)由来の構造単位:(M-3)由来の構造単位:(M-7)由来の構造単位の各含有割合は、24.2:19.1:8.7:48.0(モル%)であった。
三口フラスコに100gの2-ブタノン及び単量体(M-3)12.72g(10モル%)を仕込み、滴下する単量体溶液として、上記単量体(M-2)44.18g(50モル%)、(M-7)43.10g(40モル%)及びAIBN1.59g(2モル%)を2-ブタノン100gに溶解した溶液を用いた以外は合成例1と同様にして白色粉末の重合体(A-3)を得た(79.1g、収率79%)。この重合体(A-3)は、Mwが11,800であり、Mw/Mnが1.49であった。また、13C-NMR分析の結果、(M-2)由来の構造単位:(M-3)由来の構造単位:(M-7)由来の構造単位の各含有割合は、49.1:8.3:42.6(モル%)であった。
三口フラスコに100gの2-ブタノン及び単量体(M-3)13.47g(10モル%)を仕込み、滴下する単量体溶液として、単量体(M-1)38.88g(45モル%)、(M-6)19.12g(20モル%)、(M-7)28.53g(25モル%)及びAIBN1.69g(2モル%)を2-ブタノン100gに溶解した溶液を用いた以外は合成例1と同様にして白色粉末の重合体(A-4)を得た(78.9g、収率79%)。この重合体(A-4)は、Mwが11,000であり、Mw/Mnが1.40であった。また、13C-NMR分析の結果、(M-1)由来の構造単位:(M-3)由来の構造単位:(M-6)由来の構造単位:(M-7)由来の構造単位の各含有割合は、43.9:8.3:19.8:28.0(モル%)であった。
三口フラスコに100gの2-ブタノン及び単量体(M-3)13.18g(10モル%)を仕込み、滴下する単量体溶液として、単量体(M-2)45.78g(50モル%)、(M-6)18.70g(20モル%)、(M-7)22.33g(20モル%)及びAIBN1.65g(2モル%)を2-ブタノン100gに溶解した溶液を用いた以外は合成例1と同様にして白色粉末の重合体(A-5)を得た(76.7g、収率77%)。この重合体(A-5)は、Mwが11,800であり、Mw/Mnが1.48であった。また、13C-NMR分析の結果、(M-2)由来の構造単位:(M-3)由来の構造単位:(M-6)由来の構造単位:(M-7)由来の構造単位の各含有割合は、43.9:8.3:19.8:28.0(モル%)であった。
三口フラスコに100gの2-ブタノンを仕込み、滴下する単量体溶液として、単量体(M-1)43.08g(50モル%)、(M-7)56.92g(50モル%)及びAIBN1.68g(2モル%)を2-ブタノン100gに溶解した溶液を用いた以外は合成例1と同様にして白色粉末の重合体(A-6)を得た(80.4g、収率80%)。この重合体(A-6)は、Mwが12,100であり、Mw/Mnが1.53であった。また、13C-NMR分析の結果、(M-1)由来の構造単位:(M-7)の各含有割合は、49.6:50.4(モル%)であった。
三口フラスコに100gの2-ブタノン及び単量体(M-3)63.91g(60モル%)を仕込み、滴下する単量体溶液として、単量体(M-7)36.09g(40モル%)及びAIBN1.33g(2モル%)を2-ブタノン100gに溶解した溶液を用いた以外は合成例1と同様にして白色粉末の重合体(A-7)を得た(74.2g、収率74%)。この重合体(A-7)は、Mwが10,200であり、Mw/Mnが1.45であった。また、13C-NMR分析の結果、(M-3)由来の構造単位:(M-7)由来の構造単位の各含有割合は、48.5:51.5(モル%)であった。
三口フラスコに100gの2-ブタノン及び単量体(M-4)12.38g(10モル%)を仕込み、滴下する単量体溶液として、単量体(M-1)37.75g(45モル%)、(M-7)49.87g(45モル%)及びAIBN1.64g(2モル%)を2-ブタノン100gに溶解した溶液を用いた以外は合成例1と同様にして白色粉末の重合体(A-8)を得た(82.3g、収率82%)。この重合体(A-8)は、Mwが12,000であり、Mw/Mnが1.47であった。また、13C-NMR分析の結果、(M-1)由来の構造単位:(M-4)由来の構造単位:(M-7)由来の構造単位の各含有割合は、44.5:8.9:46.6(モル%)であった。
三口フラスコに100gの2-ブタノン及び単量体(M-4)12.12g(10モル%)を仕込み、滴下する単量体溶液として、単量体(M-2)44.48g(50モル%)、(M-7)43.39g(40モル%)及びAIBN1.60g(2モル%)を2-ブタノン100gに溶解した溶液を用いた以外は合成例1と同様にして白色粉末の重合体(A-9)を得た(79.8g、収率80%)。この重合体(A-9)は、Mwが11,200であり、Mw/Mnが1.43であった。また、13C-NMR分析の結果、(M-2)由来の構造単位:(M-4)由来の構造単位:(M-7)由来の構造単位の各含有割合は、48.7:8.8:42.5(モル%)であった。
[合成例8](フッ素原子含有重合体(E-1)の合成)
上記単量体(M-2)24.85g(30モル%)、単量体(M-8)75.15g(70モル%)を2-ブタノン100gに溶解し、さらに開始剤としてのAIBN2.05g(7モル%)を溶解した単量体溶液を調製した。
次に、温度計及び滴下漏斗を備えた1,000mLの三口フラスコに50gの2-ブタノンを仕込み、30分窒素パージした。窒素パージの後、フラスコ内をマグネティックスターラーで攪拌しながら80℃になるように加熱した。滴下漏斗を用い、上記調製した単量体溶液を3時間かけて滴下した。滴下開始時を重合開始時間とし、重合反応を6時間実施した。重合終了後、重合反応溶液を水冷により30℃以下に冷却した。冷却後、フラスコ内容物が150gになるまで濃縮し、1,125gのメタノール及び125gの水の混合溶液中に投入し、析出した沈殿を回収した。その後プロピレングリコールモノメチルエーテルアセテートにて溶媒置換を行い、フッ素原子含有重合体(E-1)の20質量%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(350.2g、収率70%)。このフッ素原子含有重合体(E-1)は、Mwが11,100であり、Mw/Mnが1.52であった。また、13C-NMR分析の結果、(M-2)由来の構造単位:(M-8)由来の構造単位の各含有割合は、29.8:70.2(モル%)であった。
感放射線性樹脂組成物の調製に用いた[A]重合体成分及び[E]フッ素原子含有重合体以外の成分を以下に示す。
下記に各構造式を示す。
B-1:4-シクロヘキシルフェニルジフェニルスルホニウムノナフルオロ-n-ブタン-1-スルホナート
B-2:トリフェニルスルホニウム2-(アダマンタン-1-イル)-1,1-ジフルオロエタン-1-スルホナート
B-3:トリフェニルスルホニウム2-ビシクロ[2.2.1]ヘプタ-2-イル-1,1,2,2-テトラフルオロエタン-1-スルホナート
C-1:2,6-ジイソプロピルアニリン
C-2:N-t-アミロキシカルボニル-4-ヒドロキシピペリジン
CC-1:トリ-n-ペンチルアミン
CC-2:ジエタノールアミン
D-1:プロピレングリコールモノメチルエーテルアセテート
D-2:シクロヘキサノン
D-3:γ-ブチロラクトン
[A]重合体成分としての(A-1)100質量部、[B]酸発生剤としての(B-1)4質量部、(B-2)4質量部及び(B-3)4質量部、[C]化合物としての(C-1)1質量部、[D]溶媒としての(D-1)2,600質量部、(D-2)1,100質量部及び(D-3)15質量部、並びに[E]フッ素原子含有重合体としての(E-1)7質量部を混合し、孔径0.20μmのフィルターでろ過して感放射線性樹脂組成物(J-1)を調製した。
下記表1に示す種類及び配合量の各成分を用いた以外は、実施例3と同様にして各実施例及び比較例の感放射線性樹脂組成物(J-2)~(J-9)及び(CJ-1)~(CJ-6)を調製した。表1の「-」は、該当する成分を用いなかったことを示す。
上記調製した実施例及び比較例の感放射線性樹脂組成物を用い、下記表2に示すパターン形成方法を用いて、レジストパターンを形成した。
(実施例3及び5~11並びに比較例1~6)
基板として、シリコンウェハ表面に膜厚230nmのCTL53(JSR製)膜及び膜厚45nmのSOG508(JSR製)膜からなる2層のレジスト下層膜を形成したシリコンウェハを用いた。感放射線性樹脂組成物を基板上にスピンコートにより塗布後、ホットプレート上にて110℃で60秒間PBを行い、膜厚100nmのレジスト被膜を形成した。このレジスト被膜に液浸ArFエキシマレーザー露光装置(S610C、ニコン製(開口数1.30))を用いマスクパターンを介して露光した。その後、表2に示すPEB温度で60秒間PEBを行った後、2.38質量%のテトラメチルアンモニウムヒドロキシド水溶液により23℃で4秒間現像を行い、水洗、乾燥を行って、ポジ型のレジストパターンを形成した。
(実施例4)
上記パターン形成方法1と同様にして、シリコンウェハ表面に2層のレジスト下層膜及びレジスト被膜を形成した後、形成したレジスト被膜上に液浸上層膜としてTCX091(JSR製)をスピンコートし、90℃で60秒間加熱して膜厚90nmの塗膜を形成した。続いて、上記この膜に上記液浸ArFエキシマレーザー露光装置を用いマスクパターンを介して露光した。その後、95℃で60秒間PEBを行った後、2.38質量%のテトラメチルアンモニウムヒドロキシド水溶液により23℃で4秒間現像し、水洗、乾燥を行って、ポジ型のレジストパターンを形成した。
上記形成したレジストパターンについて、下記方法に従って評価を行った。評価結果を下記表2に示す。
上記得られたレジストパターンのうち、線幅40nmのラインアンドスペースパターン(1L/1S)を1対1の線幅に形成する露光量を最適露光量とした。
最適露光量にて解像した40nm1L/1Sパターンについて、測長SEM(CG4000、日立製作所製)にてパターン上部から観察し、線幅を任意のポイントで10点観測しその測定値の分布度を3シグマで表現した値をLWR(nm)とした。
40nm1L/1S形成用のマスクパターンを用いて、最適露光量から1mJの間隔で露光量を変化させながら露光を実施した。各露光ショットにつき上記測長SEMを用いて40nm1L/1Sのパターンの写真を20枚撮り、1枚も倒れているパターンのない露光ショットの中で最もパターン線幅が小さいショットのパターン線幅をパターン倒れ寸法(nm)とした。
[レジスト残膜量]
最適露光量で解像した40nm1L/1Sパターンを断面SEM(S4800、日立製作所製)を用いて断面形状を観察し、パターンの高さを測長し、レジスト残膜量(nm)とした。
Claims (9)
- [A]同一又は異なる重合体中に、下記式(1)で表される構造単位(I)と下記式(2)で表される構造単位(II)とを有する重合体成分、
[B]感放射線性酸発生剤、及び
[C]環構造を有する窒素含有化合物
を含有する感放射線性樹脂組成物。
(式(1)中、R1は、水素原子又はメチル基である。Zは、R2と共に2価の単環の脂環式炭化水素基を形成する基である。R2は、炭素原子である。R3は、メチル基又はエチル基である。
式(2)中、R4は、水素原子又はメチル基である。Xは、R5と共に炭素数10以上の2価の有橋の脂環式炭化水素基を形成する基である。R5は、炭素原子である。R6は、炭素数3又は4の分岐状のアルキル基である。) - [A]重合体成分が、構造単位(I)及び構造単位(II)を有する重合体を含む請求項1に記載の感放射線性樹脂組成物。
- [A]重合体成分が、構造単位(I)を有する重合体と構造単位(II)を有する重合体とを含む混合物である請求項1に記載の感放射線性樹脂組成物。
- [A]重合体成分が、同一又は異なる重合体中に、ラクトン構造を含む構造単位(III)及び環状カーボネート構造を含む構造単位(IV)からなる群より選ばれる少なくとも1種の構造単位をさらに有する請求項1に記載の感放射線性樹脂組成物。
- [C]化合物が、芳香環構造及び窒素原子含有複素環構造からなる群より選ばれる少なくとも1種の環構造を有する請求項1に記載の感放射線性樹脂組成物。
- (1)請求項1に記載の感放射線性樹脂組成物を基板上に塗布し、レジスト被膜を形成する工程、
(2)上記レジスト被膜を露光する工程、
(3)上記露光されたレジスト被膜を加熱する工程、及び
(4)上記加熱されたレジスト被膜を現像する工程
を有するレジストパターン形成方法。
Priority Applications (3)
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| KR1020137006649A KR20130114095A (ko) | 2010-09-17 | 2011-09-15 | 감방사선성 수지 조성물, 중합체 및 레지스트 패턴 형성 방법 |
| JP2012534056A JP5900340B2 (ja) | 2010-09-17 | 2011-09-15 | 感放射線性樹脂組成物及びレジストパターン形成方法 |
| US13/830,880 US8980529B2 (en) | 2010-09-17 | 2013-03-14 | Radiation-sensitive resin composition, polymer, and resist pattern-forming method |
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| JP2010-208778 | 2010-09-17 | ||
| JP2010208778 | 2010-09-17 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US13/830,880 Continuation US8980529B2 (en) | 2010-09-17 | 2013-03-14 | Radiation-sensitive resin composition, polymer, and resist pattern-forming method |
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Family
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| PCT/JP2011/071163 Ceased WO2012036250A1 (ja) | 2010-09-17 | 2011-09-15 | 感放射線性樹脂組成物、重合体及びレジストパターン形成方法 |
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| Country | Link |
|---|---|
| US (1) | US8980529B2 (ja) |
| JP (1) | JP5900340B2 (ja) |
| KR (1) | KR20130114095A (ja) |
| TW (1) | TW201214039A (ja) |
| WO (1) | WO2012036250A1 (ja) |
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| JP2019058466A (ja) * | 2017-09-27 | 2019-04-18 | Jsr株式会社 | 医療用セメントおよびその使用 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5914241B2 (ja) * | 2012-08-07 | 2016-05-11 | 株式会社ダイセル | 高分子化合物の製造方法、高分子化合物、及びフォトレジスト用樹脂組成物 |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20130114095A (ko) | 2013-10-16 |
| JPWO2012036250A1 (ja) | 2014-02-03 |
| US20130203000A1 (en) | 2013-08-08 |
| TW201214039A (en) | 2012-04-01 |
| US8980529B2 (en) | 2015-03-17 |
| JP5900340B2 (ja) | 2016-04-06 |
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