WO2011162303A1 - 感放射線性組成物 - Google Patents
感放射線性組成物 Download PDFInfo
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- WO2011162303A1 WO2011162303A1 PCT/JP2011/064305 JP2011064305W WO2011162303A1 WO 2011162303 A1 WO2011162303 A1 WO 2011162303A1 JP 2011064305 W JP2011064305 W JP 2011064305W WO 2011162303 A1 WO2011162303 A1 WO 2011162303A1
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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
- C08F212/00—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 an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by heteroatoms or groups containing heteroatoms
- C08F212/22—Oxygen
- C08F212/24—Phenols or alcohols
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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
- C08F12/00—Homopolymers and 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 an aromatic carbocyclic ring
- C08F12/02—Monomers containing only one unsaturated aliphatic radical
- C08F12/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F12/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by hetero atoms or groups containing heteroatoms
- C08F12/22—Oxygen
- C08F12/24—Phenols or alcohols
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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
- C08F12/00—Homopolymers and 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 an aromatic carbocyclic ring
- C08F12/02—Monomers containing only one unsaturated aliphatic radical
- C08F12/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F12/06—Hydrocarbons
- C08F12/08—Styrene
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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
- C08F212/00—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 an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
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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
- C08F212/00—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 an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by heteroatoms or groups containing heteroatoms
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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
- C09D125/00—Coating compositions based on homopolymers or 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 an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
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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
- G03F7/0048—Photosensitive materials characterised by the solvents or agents facilitating spreading, e.g. tensio-active agents
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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
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
- G03F7/0382—Macromolecular compounds which are rendered insoluble or differentially wettable the macromolecular compound being present in a chemically amplified negative 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
- G03F7/004—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
- G03F7/2037—Exposure with X-ray radiation or corpuscular radiation, through a mask with a pattern opaque to that radiation
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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
Definitions
- the present invention relates to a radiation-sensitive composition useful as a resist material suitable for fine processing using various types of radiation such as ultraviolet rays, far ultraviolet rays, X-rays, and charged particle beams.
- a resist suitable for photolithography using such deep ultraviolet rays contains a radiation-sensitive acid generator that generates an acid upon irradiation with radiation (hereinafter also referred to as “exposure”), and the sensitivity of the generated acid due to its catalytic action.
- Exposure a radiation-sensitive acid generator that generates an acid upon irradiation with radiation
- Exposure the sensitivity of the generated acid due to its catalytic action.
- Exposure radiation-sensitive acid generator that improves the above is used.
- a resist composition containing a resin in which an acidic group is protected with a t-butyl group or a t-butoxycarbonyl group, and a radiation-sensitive acid generator is included. It has been proposed (see, for example, Patent Document 1). A composition containing a resin in which an acidic group is protected with a silyl group and a radiation-sensitive acid generator has been proposed (see, for example, Patent Document 2). In addition, many proposals have been made regarding chemically amplified resists such as a composition containing a resin having an acetal group and a radiation-sensitive acid generator (see, for example, Patent Document 3).
- the lithography process for forming a resist pattern on a substrate having a step such as polysilicon has increased when manufacturing a three-dimensional transistor such as a Fin-FET. Yes.
- a uniform resist It becomes difficult to form a pattern.
- a lower-layer antireflection film is formed between the substrate and the resist in order to suppress the reflection of the radiation on the substrate surface.
- this lower-layer antireflection film cannot be used.
- the reflectance of the substrate surface is particularly high. Therefore, the radiation incident on the resist and the radiation reflected on the substrate surface.
- a standing wave is generated due to the interference between the resist pattern and the resist pattern side wall has wavy irregularities or the pattern shape is deteriorated.
- the present invention has been made in view of such problems of the prior art, and the problem is that the substrate has a high radiation reflectivity on the substrate surface and a plurality of materials are mixed. Due to the standing wave generated by the interference between the radiation incident on the resist and the radiation reflected on the substrate surface, as well as excellent sensitivity and resolution even on a substrate with partially different radiation reflectivity on the substrate surface.
- An object of the present invention is to provide a radiation-sensitive composition capable of forming a resist pattern in which generation of wavy irregularities on the side wall of the resist pattern to be performed and deterioration of the pattern shape are suppressed.
- the following radiation-sensitive composition is provided.
- a radiation sensitive composition comprising a solvent component (C) containing a solvent (C1).
- R 1 and R 2 are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 15 carbon atoms, carbon An aralkyl group of formula 7 to 15, a halogen atom, a group represented by the following general formula (c1), or a group represented by the following general formula (c2), wherein R 3 each independently represents a hydrogen atom, carbon A linear or branched alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an aryl group having 6 to 15 carbon atoms, an aralkyl group having 7 to 15 carbon atoms, a halogen atom, a hydroxy group, Represents a group represented by the formula (c1) or a group represented by the following general formula (c2), k represents an integer of 1 to 10, and l represents an integer of 2 to 5.
- R 4 is linear or branched having 1 to 10 carbon atoms.
- each R 4 represents In the general formula (C1-c), R 5 represents a linear or branched alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an aryl group having 6 to 15 carbon atoms. , An aralkyl group having 7 to 15 carbon atoms, a halogen atom, a hydroxy group, a group represented by the following general formula (c1), or a group represented by the following general formula (c2), wherein n is 2 to 4 Represents an integer, and b represents an integer of 0 to 10, provided that a plurality of R 5 exist. In this case, each R 5 is independent.)
- each A independently represents a single bond or a divalent hydrocarbon group having 1 to 5 carbon atoms
- each R 6 independently represents a hydrogen atom. Or a monovalent hydrocarbon group having 1 to 5 carbon atoms.
- R 7 represents a hydrogen atom, a methyl group, or a trifluoromethyl group.
- R 8 represents a linear or branched alkyl group having 1 to 12 carbon atoms, or 1 carbon atom. Represents a linear or branched alkoxy group of ⁇ 12, c represents an integer of 1 to 3, and d represents an integer of 0 to 4. However, when a plurality of R 8 are present, each R 8 Are independent of each other.
- the content of the polymer (A1) is 50 to 100% by mass of the total of the polymer component (A), and further contains a crosslinking agent (D).
- the radiation-sensitive composition according to any one of [3] to [5], wherein a negative resist pattern can be formed.
- the radiation-sensitive composition of the present invention contains a solvent (C1) that is at least one selected from the group consisting of a solvent (C1-a), a solvent (C1-b), and a solvent (C1-c).
- a solvent (C1) that is at least one selected from the group consisting of a solvent (C1-a), a solvent (C1-b), and a solvent (C1-c).
- the radiation sensitive composition of the present invention is a radiation sensitive composition comprising a polymer component (A), a radiation sensitive acid generator (B), and a solvent component (C). The details will be described below.
- Polymer component (A) is a polymer component containing at least one of a polymer (A1) having an acidic group and a polymer (A2) having a group in which the acidic group is protected by an acid-dissociable group. It is.
- the radiation-sensitive composition of the present invention can form either a positive resist pattern or a negative resist pattern as follows. Composition.
- the radiation-sensitive composition of the present invention was produced from a radiation-sensitive acid generator together with a polymer component (A) containing a polymer (A1) having an acidic group and a radiation-sensitive acid generator (B).
- a crosslinking agent (D) that undergoes a crosslinking reaction by the action of an acid, the exposed portion can be crosslinked and can function as a resist material capable of forming a negative resist pattern remaining after development.
- the radiation-sensitive composition of the present invention comprises a polymer component (A) containing a polymer (A2) having a group in which an acidic group is protected by an acid-dissociable group, and a radiation-sensitive acid generator (B ),
- the acid-dissociable group in the exposed portion is eliminated, the acidic group is deprotected, and it functions as a resist material capable of forming a positive resist pattern that is removed by the developer. it can.
- Polymer (A1) The polymer component (A) preferably contains a polymer (A1) having a repeating unit (a1) having a phenolic hydroxyl group as represented by the general formula (a1).
- examples of the “linear or branched alkyl group having 1 to 12 carbon atoms” represented by R 8 include a methyl group, an ethyl group, an n-propyl group, and an i-propyl group. N-butyl group, s-butyl group, i-butyl group, t-butyl group, n-pentyl group and the like. Among these, a methyl group, an ethyl group, an n-propyl group, and an i-propyl group are preferable because the rectangularity of the pattern shape can be improved.
- examples of the “linear or branched alkoxy group having 1 to 12 carbon atoms” represented by R 8 include the above-mentioned “linear or branched alkoxy group having 1 to 12 carbon atoms”.
- c is 1 to 3, and is preferably 1.
- d is 0 to 4, preferably 0 to 2, and more preferably 0. That is, the repeating unit (a1) is particularly preferably a repeating unit derived from hydroxystyrene (hydroxystyrene unit).
- the sum (c + d) of the value of c and the value of d is 5 or less.
- Examples of the hydroxystyrene that gives the hydroxystyrene unit contained in the polymer (A1) include o-hydroxystyrene, m-hydroxystyrene, and p-hydroxystyrene.
- p-hydroxystyrene is particularly preferable from the viewpoints of structural stability and acidity of the phenolic hydroxyl group. That is, the polymer (A1) preferably contains a repeating unit derived from p-hydroxystyrene.
- the content of the repeating unit (a1) is preferably 50 to 90 mol%, more preferably 60 to 90 mol% of the total of all repeating units of the polymer (A1). Preferably, it is 65 to 85 mol%.
- the content ratio of the repeating unit (a1) is within the above range, the polymer (A1) has a certain amount of hydroxyl groups. Therefore, the radiation-sensitive material contains a certain amount or more of such a polymer (A1).
- the soluble composition can be suitably used as a radiation-sensitive composition that improves the solubility in an alkali developer and gives a negative resist pattern.
- the repeating unit contained in the polymer (A1) other than the above-described repeating unit (a1) is not particularly limited. However, from the viewpoint of good polymerization reactivity with the repeating unit (a1), styrene is used. At least one of a repeating unit derived from the following (hereinafter also simply referred to as “styrene unit”) and a repeating unit derived from ⁇ -methylstyrene (hereinafter also simply referred to as “ ⁇ -methylstyrene unit”) is preferable.
- the polymer (A1) includes a hydroxystyrene / styrene copolymer having a hydroxystyrene content of 60 to 90 mol%, and a hydroxystyrene / ⁇ -methyl copolymer having a hydroxystyrene content of 65 to 90 mol%.
- a copolymer comprising at least one of styrene copolymers (hereinafter also simply referred to as “specific hydroxystyrene copolymer”) is preferable.
- the content ratio of hydroxystyrene units in the polymer (A1) is 60 to 90 mol% of the total of all repeating units of the specific hydroxystyrene copolymer. It is preferably some 65 to 85 mol%.
- the content ratio of the hydroxystyrene unit is within the above range, a pattern with good rectangularity can be obtained and the exposure margin can be widened.
- dissolution rate with respect to the alkaline developing solution of a polymer (A1) will fall that the content rate of a hydroxy styrene unit is less than 60 mol%, the developability and resolution as a resist will be impaired.
- the resist is not sufficiently cured, so even in the exposed portion, it is dissolved in the developer, and the pattern shape is deteriorated.
- the pattern shape tends not to be rectangular.
- a polymer (A1) acquires the solubility with respect to an alkali developing solution by containing such a repeating unit (a1). That is, the radiation-sensitive composition of the present invention is a negative type composition by blending the polymer (A1) containing the repeating unit (a1), the radiation-sensitive acid generator (B), and the crosslinking agent (D). It becomes the radiation sensitive composition which can form the resist pattern of this.
- the weight average molecular weight (Mw) of the polymer (A1) is preferably 2,000 to 8,000, and more preferably 3,000 to 7,000. Further, the dispersity defined by the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is preferably 1.8 or less, and more preferably 1.6 or less. preferable. If the weight average molecular weight of the polymer (A1) is less than 2,000, the degree of polymerization of the polymer (A1) is low, so that the film-forming property as a radiation sensitive composition, the sensitivity as a resist, etc. deteriorate. It tends to end up.
- the weight average molecular weight of the polymer (A1) is more than 8,000, the degree of polymerization of the polymer (A1) is high, so that the sensitivity as a resist tends to deteriorate. Further, if the degree of dispersion of the polymer (A1) is more than 1.8, the size of the polymer in the resist film varies and sufficient contrast cannot be obtained, so that the resolution as a resist deteriorates. It tends to end up.
- a polymer (A1) may be used individually by 1 type, and may use 2 or more types together.
- the content ratio of the polymer (A1) is 50 in total of the polymer component (A). It is preferably from ⁇ 100 mol%, more preferably from 70 to 100 mol%, particularly preferably from 80 to 100 mol%. When the content ratio of the polymer (A1) is within the above range, a pattern with good rectangularity can be obtained and the exposure margin can be widened.
- the method for producing the polymer (A1) is not particularly limited, and can be produced by a conventionally known method.
- a specific hydroxystyrene copolymer (i) a monomer in which the hydroxyl group of hydroxystyrene is protected with a protecting group, such as butoxycarbonyloxystyrene, butoxystyrene, acetoxystyrene, tetrahydropyranyloxystyrene, etc.
- polymerization for example, polymerization can be performed by an appropriate method such as radical polymerization, anionic polymerization, cationic polymerization, thermal polymerization, etc., but anionic polymerization or cationic polymerization can reduce the degree of dispersion of the resulting copolymer. It is preferable in that it can be performed.
- an acid catalyst used for the method of (i) inorganic acids, such as hydrochloric acid and a sulfuric acid, can be mentioned, for example.
- the basic catalyst include organic bases such as trialkylamine and inorganic bases such as sodium hydroxide.
- the polymer component (A) may contain, for example, a polymer (A2) having a group in which an acidic group such as a phenolic hydroxyl group or a carboxyl group is protected with an acid dissociable group.
- the radiation-sensitive composition of the present invention can increase the dissolution rate of the resist in the developer during development by containing such a polymer (A2). That is, by adjusting the content of the polymer (A2) in the radiation-sensitive composition of the present invention, the dissolution rate of the resist in the developing solution at the time of development can be controlled to obtain a pattern with good rectangularity. Can do.
- the polymer (A2) is composed of a repeating unit represented by the following general formula (a2) (hereinafter simply referred to as “repeating unit (a2)”) and a repeating unit represented by the following general formula (a3) (hereinafter referred to as “repeating unit (a3)”). It is preferable that it contains at least one repeating unit of “repeated unit (a3)”.
- R 7 represents a hydrogen atom, a methyl group, or a trifluoromethyl group.
- R 9 represents a monovalent acid-dissociable group. are shown, e is an integer of 1-3. However, if R 9 there are a plurality, each R 9 is independently. in the formula (a3), R 10 represents a monovalent acid-dissociable Group.
- the polymerizable monomer that gives the repeating unit (a2) include 4-t-butoxystyrene, 4- (2-ethyl-2-propoxy) styrene, 4- (1-ethoxyethoxy) styrene, Examples thereof include t-butoxycarbonylstyrene and t-butoxycarbonylmethylenestyrene.
- the repeating unit (a2) may be contained alone or in combination of two or more.
- the polymerizable monomer that gives the repeating unit (a3) include, for example, t-butyl (meth) acrylate, 2-methyl-2-adamantyl (meth) acrylate, and 2-ethyl (meth) acrylate.
- -2-Adamantyl 1-methylcyclopentyl (meth) acrylate, 1-ethylcyclopentyl (meth) acrylate, 2,5-dimethyl-2,5-hexanediol di (meth) acrylate and the like.
- the repeating unit (a3) may be contained alone or in combination of two or more.
- (meth) acrylic acid means both acrylic acid and methacrylic acid
- (meth) acrylate means both acrylate and methacrylate.
- the polymer (A2) may further contain the above-mentioned repeating unit (a1).
- polymer (A2) examples include 4-hydroxystyrene / 4-t-butoxystyrene copolymer, 4-hydroxystyrene / 4-t-butoxystyrene / 1-methylcyclopentyl acrylate copolymer, 4-hydroxy Styrene / 4-tert-butoxystyrene / 1-ethylcyclopentyl acrylate copolymer, 4-hydroxystyrene / 4-tert-butoxystyrene / styrene copolymer, 4-hydroxystyrene / tert-butyl acrylate / styrene copolymer 4-hydroxystyrene / 1-methylcyclopentyl acrylate / styrene copolymer, 4-hydroxystyrene / 1-ethylcyclopentyl acrylate / styrene copolymer, 4-hydroxystyrene / 4-tert-butoxyst
- the polystyrene equivalent weight average molecular weight (Mw) of the polymer (A2) measured by gel filtration chromatography (GPC) is preferably 1,000 to 150,000, and preferably 3,000 to 100,000. More preferred is 3,000 to 50,000.
- the ratio (Mw / Mn) of Mw of the polymer (A2) to the polystyrene-equivalent number average molecular weight (Mn) measured by GPC is preferably 1 to 10, and preferably 1 to 5. It is preferably 1 to 2.5.
- a polymer (A2) may be used individually by 1 type, and may use 2 or more types together.
- the content ratio of the polymer (A2) is 0 of the total of the polymer components (A). It is preferably from ⁇ 30 mol%, more preferably from 0 to 20 mol%, particularly preferably from 0 to 10 mol%.
- the content ratio of the polymer (A2) is less than 30 mol%, it is possible to obtain a pattern with good rectangularity and widen the exposure margin.
- the content of the polymer (A2) is more than 30 mol%, the difference between the solubility of the exposed area and the solubility of the unexposed area decreases (contrast decreases), and the pattern shape deteriorates. It may end up.
- the content ratio of the polymer (A2) is 50 in total of the polymer component (A). It is preferably from ⁇ 100 mol%, more preferably from 50 to 90 mol%, particularly preferably from 50 to 80 mol%.
- the content ratio of the polymer (A2) is within the above-described range, the sensitivity can be adjusted and high resolution is obtained, which is preferable.
- Radiation sensitive acid generator (B) As the acid generator (B), an onium salt compound such as an iodonium salt compound represented by the following general formula (B3) or a sulfonium salt compound represented by the following general formula (B4) is used. Is preferred.
- an onium salt compound such as an iodonium salt compound represented by the following general formula (B3) or a sulfonium salt compound represented by the following general formula (B4) is used. Is preferred.
- X ⁇ represents a sulfonate anion represented by R—SO 3 —
- R in the sulfonate anion represents a fluorine atom, a hydroxyl group, an alkoxy group, or a carboxyl group.
- An optionally substituted aliphatic hydrocarbon group, an aryl group or a group derived therefrom is represented by:
- each R 14 independently represents an optionally substituted carbon number of 1 to 10 A linear or branched alkyl group, or an optionally substituted aryl group having 6 to 18 carbon atoms, or two R 14s are bonded to each other, and two R 14s are bonded to each other.
- each R 15 is independently a straight chain having 1 to 10 carbon atoms which may be substituted or Branched alkyl group, or a substituted which may have been a good C 6-18 aryl group, or, attached to two of each other of the three R 15, bonded to three R 15 And the remaining one R 15 is a linear or branched alkyl group having 1 to 10 carbon atoms which may be substituted, or 6 carbon atoms which may be substituted. 18 to 18 aryl groups may be shown.
- the “optionally substituted linear or branched alkyl group having 1 to 10 carbon atoms” represented by R 14 or R 15 is, for example, a methyl group And ethyl group, n-propyl group, i-propyl group, n-butyl group, s-butyl group, i-butyl group, t-butyl group, n-pentyl group and the like.
- examples of the “optionally substituted aryl group having 6 to 18 carbon atoms” represented by R 14 or R 15 include a phenyl group, a 4-methylphenyl group, Examples include 2,4,6-trimethylphenyl group, 4-hydroxyphenyl group, 4-fluorophenyl group, 2,4-fluorophenyl group and the like.
- examples of the sulfonium ion represented by X ⁇ include trifluoromethanesulfonate, nonafluoro-n-butanesulfonate, benzenesulfonate, p-toluenesulfonate, 10-camphorsulfonate, 2- Trifluoromethylbenzenesulfonate, 4-trifluoromethylbenzenesulfonate, 2,4-difluorobenzenesulfonate, perfluorobenzenesulfonate, 2- (bicyclo [2.2.1] heptan-2-yl) -1,1-difluoroethane Examples thereof include sulfonate, 2- (bicyclo [2.2.1] heptan-2-yl) ethanesulfonate, and the like. These sulfonium ions may be used alone or in combination of two or more.
- the radiation sensitive acid generator (B) (acid generator (B)) is a component that generates an acid when irradiated with radiation.
- the acid generator (B) include nonionic compounds such as a sulfonyloxyimide compound represented by the following general formula (B1) and a sulfonyldiazomethane compound represented by the following general formula (B2).
- a radiation sensitive acid generator may be used.
- R 11 represents a divalent hydrocarbon group
- R 12 represents an alkyl group, an aryl group, or a halogen atom, provided that the group represented by R 12 is substituted. Is also good.
- examples of the “divalent hydrocarbon group” represented by R 11 include an alkylene group, an arylene group, an alkoxylene group, a cycloalkylene group, and a cycloskeleton including a cyclic skeleton having an unsaturated bond.
- a divalent group such as an alkylene group can be exemplified.
- the “alkyl group” represented by R 12 may have an alkyl group that may be substituted with a halogen atom, an alkyl group that may have a camphor skeleton, or an ester bond.
- a cycloalkyl group can be mentioned.
- Examples of the “aryl group” represented by R 12 include an aryl group which may be substituted with a halogen atom or an alkyl group.
- Examples of the sulfonyloxyimide compound represented by the general formula (B1) include N- (trifluoromethanesulfonyloxy) bicyclo [2.2.1] hept-5-ene-2,3-dicarboximide.
- These sulfonyloxyimide compounds may be used individually by 1 type, and may use 2 or more types together.
- each R 13 independently represents a monovalent organic group.
- examples of the “monovalent organic group” represented by R 13 include an alkyl group, an aryl group, a halogen-substituted alkyl group, and a halogen-substituted aryl group.
- Examples of the sulfonyldiazomethane compound represented by the general formula (B2) include bis (trifluoromethanesulfonyl) diazomethane, bis (cyclohexanesulfonyl) diazomethane, bis (phenylsulfonyl) diazomethane, and bis (4-toluenesulfonyl) diazomethane.
- the mixing ratio of the acid generator (B) is preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the polymer component (A). More preferably, it is ⁇ 15 parts by mass.
- the compounding ratio of the acid generator (B) is too small, the sensitivity and developability as a resist tend to be lowered.
- the compounding ratio of the acid generator (B) is excessive, the transparency to the radiation as a resist, the shape of the resist pattern, the heat resistance, etc. tend to be lowered.
- the acid generator (B) other acid generators can be used in addition to the above-described onium salt compound, sulfonyloxyimide compound, and sulfonyldiazomethane compound.
- the blending ratio of these other acid generators is preferably 30% by mass, more preferably 10% by mass or less, based on the total amount of the acid generator (B). When the mixing ratio of other acid generators is excessive, the sensitivity and resolution as a resist may be deteriorated.
- Solvent component (C) The radiation-sensitive composition of the present invention is obtained by dissolving the above-described polymer component (A) and acid generator (B) and, if necessary, each component described later in the solvent component (C). is there.
- the amount of the solvent component (C) is such that the total solid concentration of the radiation-sensitive composition is 0.1 to 50% by mass of the radiation-sensitive composition.
- the amount is preferably 1 to 40% by mass, and more preferably.
- Solvent (C1) The solvent component (C) contains the solvent (C1).
- the solvent (C1) is represented by the solvent (C1-a) represented by the general formula (C1-a), the solvent (C1-b) represented by (C1-b), and (C1-c). And at least one solvent selected from the group consisting of solvents (C1-c).
- the boiling points of the solvent (C1-a), the solvent (C1-b), and the solvent (C1-c) are all 165 ° C. or higher.
- the radiation-sensitive composition of the present invention is at least one selected from the group consisting of a solvent (C1-a) having a boiling point of 165 ° C. or higher, a solvent (C1-b), and a solvent (C1-c).
- the solvent (C1) does not evaporate and remains in the resist film even after the radiation-sensitive composition is applied on the substrate and heated (PB: Pre-Bake). Then, it is presumed that the diffusion of the acid generated from the radiation-sensitive acid generator (B) is promoted by irradiation. This suppresses unevenness on the sidewalls of the resist pattern due to the influence of standing waves generated by the radiation incident on the resist film and the reflected radiation reflected by the lower end of the resist film. I think it can be done.
- the boiling point of the solvent (C1) is 165 ° C. or higher, preferably 165 to 250 ° C., more preferably 165 to 230 ° C., and particularly preferably 170 to 220 ° C.
- the boiling point of the solvent (C1) is within the above range, it can remain in the resist film more reliably even after PB, and the influence of standing waves can be improved.
- the boiling point of the solvent (C1) is less than 165 ° C., it will volatilize during PB, the effect of standing waves cannot be improved, and there is a risk that irregularities will occur on the side walls of the resist pattern. is there.
- the boiling point is the boiling point measured at 101.3 kPa.
- Examples of the “chain or branched alkyl group” include, for example, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, s-butyl group, i-butyl group, t-butyl group, An n-pentyl group, an n-hexyl group, an n-heptyl group, and the like can be given.
- these alkyl groups a linear or branched alkyl group having 1 to 5 carbon atoms is particularly preferable.
- Examples of “15 to 15 aryl groups” include a phenyl group and a tolyl group. Among these aryl groups, an aryl group having 6 to 10 carbon atoms is preferable, and an aryl group having 6 to 8 carbon atoms is particularly preferable.
- Examples of “ ⁇ 15 aralkyl groups” include a benzyl group. Among these aralkyl groups, an aralkyl group having 7 to 12 carbon atoms is preferable, and an aralkyl group having 7 to 10 carbon atoms is particularly preferable.
- Examples of the “linear or branched alkyl group having 1 to 5 carbon atoms” represented by R 3 in the general formula (C1-a) include, for example, a methyl group, an ethyl group, an n-propyl group, and i-propyl. Group, n-butyl group, s-butyl group, i-butyl group, t-butyl group, n-pentyl group and the like. Of these alkyl groups, methyl, ethyl, n-propyl, i-propyl, n-butyl, s-butyl, i-butyl and t-butyl are preferred.
- C 1-5 alkoxy group represented by R 3 in the general formula (C1-a)
- a methoxy group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group examples thereof include s-butoxy group, i-butoxy group, t-butoxy group, and n-pentyloxy group.
- alkoxy groups a methoxy group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an s-butoxy group, an i-butoxy group, and a t-butoxy group are preferable.
- examples of the “divalent hydrocarbon group having 1 to 5 carbon atoms” represented by A include, for example, a methylene group, an ethylene group, an n-propylene group, and an i-propylene group. N-butylene group, i-butylene group, n-pentene group and the like.
- the bond or group represented by A is preferably a single bond or a divalent hydrocarbon group having 1 to 4 carbon atoms, particularly preferably a single bond or a divalent hydrocarbon group having 1 to 3 carbon atoms. .
- examples of the “monovalent hydrocarbon group having 1 to 5 carbon atoms” represented by R 6 include a methyl group, an ethyl group, an n-propyl group, and an i-propyl group. Group, n-butyl group, i-butyl group, n-pentyl group and the like.
- the atom or group represented by R 6 is preferably a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms, particularly a hydrogen atom or a monovalent hydrocarbon group having 1 to 3 carbon atoms. preferable.
- l is an integer of 2 to 5, preferably an integer of 2 to 4, and particularly preferably 2 or 3.
- Examples of the solvent (C1-a) include diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, dipropylene glycol monomethyl ether acetate, dipropylene glycol monoethyl ether acetate, Examples include diethylene glycol monoethyl ether and diethylene glycol monobutyl ether. Among these, diethylene glycol diethyl ether, diethylene glycol monoethyl ether acetate, and dipropylene glycol monomethyl ether acetate are particularly preferable.
- m is an integer of 2 to 4, preferably an integer of 2 to 3, and particularly preferably 2.
- a is an integer of 0 to 12.
- Examples of the solvent (C1-b) include ⁇ -valerolactone, ⁇ -hexanolactone, ⁇ -octanolactone, ⁇ -methyl- ⁇ -valerolactone, ⁇ , ⁇ -dimethyl- ⁇ -valerolactone, ⁇ - Acetyl- ⁇ -valerolactone, ⁇ -chloro- ⁇ -valerolactone, ⁇ -bromo- ⁇ -valerolactone, ⁇ -chloro- ⁇ -valerolactone, ⁇ -bromo- ⁇ -valerolactone, ⁇ -caprolactone, etc. Can do. Among these, ⁇ -valerolactone is particularly preferable.
- n is an integer of 2 to 4, preferably an integer of 2 to 3, and particularly preferably 2.
- b is an integer of 0 to 10.
- Examples of the solvent (C1-c) include 4-ethyl-1,3-dioxane-2-one, 1,3-dioxane-2-one, 3-methyl-1,3-dioxane-2-one, 4- Methyl-1,3-dioxane 2-one, 3-ethyl-1,3-dioxane 2-one, 4-ethyl-1,3-dioxane 2-one, 3-propyl-1,3-dioxane 2-one, 4-propyl-1,3-dioxane 2-one, 3-bromo-1,3-dioxane 2-one, 4-bromo-1,3-dioxane 2-one, 3-chloro-1,3-dioxane 2- ON, 4-chloro-1,3-dioxane-2-one and the like. Of these, 4-ethyl-1,3-dioxane-2-one is particularly preferred.
- the content of the solvent (C1) is preferably 0.01 to 50% by mass, more preferably 0.01 to 20% by mass, based on the total amount of the solvent component (C). Is particularly preferably 0.01 to 15% by mass.
- the content ratio of the solvent (C1) is within the above-mentioned range, the acid generated from the acid generator (B) can be efficiently diffused, and an excellent pattern shape, that is, a rectangular resist pattern is formed. be able to.
- the content of the solvent (C1) is less than 0.01% by mass, the acid diffusion effect by the solvent (C1) is weak, unevenness is generated on the side wall of the resist pattern, and the resist pattern is inferior in pattern shape. There is a risk that.
- the content of the solvent (C1) is more than 50% by mass, the acid diffusion effect by the solvent (C1) is too strong, so that the acid diffuses to the unexposed part, and the resist is inferior in dimensional fidelity. There is a risk of becoming.
- Solvent (C2) The solvent component (C) may contain other solvents (hereinafter also referred to as “solvent (C2)”) in addition to the above-mentioned solvent (C1).
- Examples of the solvent (C2) include ethers, esters, ether esters, ketone esters, ketones, amides, amide esters, lactams, lactones (the above general formula (C1-b) And (halogenated) hydrocarbons and the like.
- ethylene glycol monoalkyl ethers diethylene glycol dialkyl ethers (excluding those represented by the general formula (C1-a)), propylene glycol monoalkyl ethers, propylene glycol dialkyl ethers, ethylene glycol Monoalkyl ether acetates, diethylene glycol monoalkyl ether acetates (excluding those represented by the general formula (C1-b)), propylene glycol monoalkyl ether acetates, dipropylene glycol monoalkyl ether acetates (previously the general formula (Excluding those represented by (C1-a)), acetic acid esters, hydroxyacetic acid esters, alkoxyacetic acid esters, acetoacetic acid esters, propionic acid esters, lactic acid esters , Alkoxypropionic esters, butyric esters, pyruvates, (non) cyclic ketones, N, N-dialkylformamides, N, N-dialky
- Such a solvent (C2) include 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 monomethyl ether, Propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol mono-n-butyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, propylene glycol di-n-propyl ether, propylene glycol di-n-butyl ether, propylene Glycol monomethyl ether acetate, propylene glycol monoethyl Ether acetate, propylene glycol mono -n- propyl ether acetate, propylene glycol mono -n- butyl ether acetate,
- solvents (C2) propylene glycol monoalkyl ether acetates, lactic acid esters, 3-alkoxypropionic acid esters, (non) cyclic ketones, and the like are preferable.
- a solvent (C2) may be used individually by 1 type, and may use 2 or more types together.
- Crosslinking agent (D) When the radiation sensitive composition of this invention is a radiation sensitive composition which can form a negative resist pattern, it is preferable that the crosslinking agent (D) is further included. That is, the radiation-sensitive composition of the present invention contains a crosslinking agent (D), and the content ratio of the polymer (A1) in the polymer component (A) is 50 in total of the polymer component (A). When it is ⁇ 100% by mass, a negative resist pattern can be formed. Since the radiation-sensitive composition of the present invention contains the crosslinking agent (D), the crosslinking reaction of the crosslinking agent (D) is caused by the catalytic action of the acid generated from the acid generator (B) when irradiated with radiation. It proceeds and crosslinks between the molecules of the polymer (A) and within the same molecule to form a crosslinked polymer having low solubility in an alkali developer, so that a negative resist pattern can be formed after development. .
- Such a crosslinking agent (D) is not particularly limited as long as the polymer (A) can be crosslinked and the crosslinked polymer is insoluble in an alkali developer.
- Examples of such a crosslinking agent (D) include compounds having groups represented by the following general formulas (D1) to (D5).
- Q 1 represents a single bond, an oxygen atom, a sulfur atom, a carbonyloxy group, an amino group, or a nitrogen atom
- Q 2 represents an oxygen atom or a sulfur atom
- p represents 1 Or 2
- i represents an integer of 0 to 3
- Examples of the group represented by the general formula (D1) include a glycidyl ether group, a glycidyl ester group, and a glycidyl amino group.
- Q 3 represents an oxygen atom, a carbonyl group, or a carbonyloxy group
- each R 16 independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms
- 17 represents an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 14 carbon atoms
- q represents an integer of 1 or more.
- Examples of the group represented by the general formula (D2) include a methoxymethyl group, an ethoxymethyl group, a benzyloxymethyl group, an acetoxymethyl group, a benzoyloxymethyl group, a formyl group, and an acetyl group.
- each R 18 independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- Examples of the group represented by the general formula (D3) include a vinyl group and an isopropenyl group.
- each R 16 independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms
- each R 19 independently represents an alkyl group having 1 to 5 carbon atoms, Or an alkylol group having 1 to 5 carbon atoms
- q represents an integer of 1 or more.
- R 16 and q in the general formula (D4) has the same meaning as R 16 and q in the general formula (D2).
- Examples of the group represented by the general formula (D4) include a dimethylaminomethyl group, a diethylaminomethyl group, a dimethylolaminomethyl group, and a diethylolaminomethyl group.
- each R 16 independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- R 20 is formed together with a nitrogen atom to which R 20 is bonded, And a divalent 3- to 8-membered heterocyclic group further having any one of a sulfur atom and a nitrogen atom, q represents an integer of 1 or more.
- R 16 and q in the general formula (D5) has the same meaning as R 16 and q in the general formula (D2) and (D4).
- Examples of the group represented by the general formula (D5) include a monophorylmethyl group.
- Examples of the compound having a crosslinkable functional group include a bisphenol A epoxy compound, a bisphenol F epoxy compound, a bisphenol S epoxy compound, a novolac resin epoxy compound, a resole resin epoxy compound, and a poly (hydroxystyrene) system.
- a methylol group-containing phenol compound, a methoxymethyl group-containing melamine compound, a methoxymethyl group-containing phenol compound, a methoxymethyl group-containing glycoluril compound, a methoxymethyl group-containing urea compound, or acetoxymethyl Group-containing phenol compounds are preferred, methoxymethyl group-containing melamine compounds such as hexamethoxymethylmelamine, methoxymethyl group-containing glycoluril compounds, methoxymethyl group-containing urea compounds are more preferred, 1,3-bis (methoxymethyl) urea, 1 , 3,4,6-tetrakis (methoxymethyl) glycoluril is particularly preferred.
- Examples of the methoxymethyl group-containing melamine compound include CYMEL300, CYMEL301, CYMEL303, CYMEL305 (manufactured by CYTEC Industries) and the like under the trade names below.
- CYMEL1174 manufactured by CYTEC Industries
- examples of the methoxymethyl group-containing urea compound include MX290 (manufactured by Sanwa Chemical Co., Ltd.) under the trade name.
- these crosslinking agents (D) may be used individually by 1 type, and may use 2 or more types together.
- the crosslinking agent (D) it is also preferable to use a polymer having the aforementioned crosslinkable functional group. That is, a polymer in which a hydrogen atom of an acidic group included in the repeating unit (a1) contained in the polymer (A1) or the polymer (A2) is substituted with a crosslinkable functional group can be used.
- the rate of introduction of the crosslinkable functional group cannot be generally defined by the type of the crosslinkable functional group, the type of the polymer, etc., but is preferably 5 to 60 mol%, and preferably 10 to 50%. It is more preferably mol%, and particularly preferably 15 to 40 mol%.
- the introduction ratio of the crosslinkable functional group is less than 5 mol%, the crosslinking reaction by the crosslinking agent (D) does not proceed sufficiently, so that crosslinking is reduced and the shape (height) of the resist pattern is deteriorated (decreased). , Meandering, swelling and the like tend to occur.
- the introduction ratio of the crosslinkable functional group is more than 60 mol%, the developability of the unexposed area tends to be lowered.
- Acid diffusion controller (E) The radiation-sensitive composition of the present invention may further contain an acid diffusion control agent (hereinafter also referred to as “acid diffusion control agent (E)”).
- the acid diffusion controller (E) suppresses diffusion of the acid generated from the acid generator (B) in the resist film by radiation irradiation, and undesired chemical reaction in the non-exposed area, that is, in the non-exposed area. It is a component which has an effect
- the radiation-sensitive composition of the present invention further improves the resolution as a resist, and from exposure to post-exposure heat treatment (PEB: Post- Changes in resist pattern line width caused by fluctuations in the retention time until exposure bake (PED: Post-Exposure Delay) can be suppressed, and a radiation-sensitive composition with excellent process stability can be obtained. be able to.
- PEB Post- Changes in resist pattern line width caused by fluctuations in the retention time until exposure bake
- PED Post-Exposure Delay
- Examples of the acid diffusion controller (E) include nitrogen-containing organic compounds.
- Examples of such a nitrogen-containing organic compound include a compound represented by the following general formula (E1) (hereinafter also referred to as “nitrogen-containing compound (E1)”) and a compound represented by the following general formula (E2).
- nitrogen-containing compound (E2) a compound represented by the following general formula (E2)
- E3 polyamino compound or polymer having three or more nitrogen atoms
- amide group examples thereof include a compound (E4), a urea compound (E5), and a nitrogen-containing heterocyclic compound (E6).
- each R 21 is independently a hydrogen atom, an optionally substituted linear, branched, or cyclic alkyl group, an optionally substituted aryl group, or a substituted group.
- nitrogen-containing compound (E1) examples include trialkylamines such as trioctylamine, substituted alkylamines such as di (cycloalkyl) amines, tri (cycloalkyl) amines, and trialcoholamines; Aromatic amines can be mentioned.
- each R 22 is independently a hydrogen atom, an optionally substituted linear, branched, or cyclic alkyl group, an optionally substituted aryl group, or a substituted group.
- B represents a single bond, an alkylene group having 1 to 6 carbon atoms, an oxygen atom, a carbonyl group, or a carbonyloxy group.
- Examples of the nitrogen-containing compound (E2) include N, N, N ′, N′-tetrakis (2-hydroxypropyl) ethylenediamine.
- nitrogen-containing compound (E3) examples include triazines, polyethyleneimine, polyallylamine, 2-dimethylaminoethylacrylamide polymer, and the like.
- Examples of the amide group-containing compound (E4) include compounds represented by the following general formula (E4).
- each R 23 is independently a hydrogen atom, an optionally substituted linear, branched, or cyclic alkyl group, an optionally substituted aryl group, or a substituted group. or showing a which may be an aralkyl group, or two R 23 are bonded to each other, may form a heterocyclic ring structure with the two nitrogen atoms to which R 23 is bonded .
- R 24 is (This represents a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms which may be substituted, an aryl group which may be substituted, or an aralkyl group which may be substituted.)
- Examples of the amide group-containing compound (E4) include 2-phenylbenzimidazole-1-carboxylic acid.
- Examples of the urea compound (E5) include urea, methylurea, 1,1-dimethylurea, 1,3-dimethylurea, 1,1,3,3-tetramethylurea, 1,3-diphenylurea, tri-n. -Butylthiourea and the like can be mentioned.
- Examples of the nitrogen-containing heterocyclic compound (E6) include imidazoles such as 2-phenylbenzimidazole, pyridines, piperazines, piperidines such as 3-piperidino-1,2-propanediol, triazines, and morpholines.
- Other examples include pyrazine, pyrazole, pyridazine, quinosaline, purine, pyrrolidine, 1,4-diazabicyclo [2.2.2] octane.
- the acid diffusion controller (E) is represented by the iodonium salt compound (E7) represented by the following general formula (E7) or the following general formula (E8) in addition to the above acid diffusion controller.
- Examples thereof include onium salt compounds such as the sulfonium salt compound (E8).
- Y - is R-COO - shows the carbonate anion represented by, R in the carbonate anion is substituted 1 carbon atoms which may have a ⁇ 20 linear A chain, branched or cyclic alkyl group, an optionally substituted aryl group having 1 to 20 carbon atoms, an optionally substituted straight chain, branched or cyclic alkenyl group having 1 to 20 carbon atoms A branched or cyclic alkynyl group that may be substituted, a branched or cyclic alkoxy group that may be substituted, and in the general formula (E7), each R 25 is independently substituted; Represents a linear or branched alkyl group having 1 to 10 carbon atoms which may be substituted, or an aryl group having 6 to 18 carbon atoms which may be substituted, or two R 25 are bonded to each other And may form a cyclic structure together with an iodine atom to which two R
- R 26 forms a cyclic structure with the sulfur atom to which R 26 is bonded, and the remaining one R 26 is an optionally substituted linear or branched alkyl group having 1 to 10 carbon atoms, or a substituted May be an aryl group having 6 to 18 carbon atoms.
- onium salt compounds examples include triphenylsulfonium salicylate and triphenylsulfonium-4-trifluoromethyl salicylate.
- the acid diffusion control agent (E) may be used alone or in combination of two or more.
- the blending ratio of the acid diffusion controller (E) is preferably 60 parts by mass or less with respect to 100 parts by mass of the polymer component (A), and 0.001 to 50 More preferred is part by mass, and particularly preferred is 0.005 to 40 parts by mass.
- the compounding amount of the acid diffusion controller (E) is excessive, the sensitivity and developability as a resist tend to be lowered.
- the blending amount of the acid diffusion controller (E) is too small, the accuracy of the resist pattern shape and dimensions may be lowered depending on the conditions of the lithography process.
- the radiation-sensitive composition of the present invention may further contain various additives in addition to the above-described components.
- additives include surfactants and the like that have an action of improving the coating properties and striation properties of the radiation-sensitive composition, the developability as a resist, and the like.
- surfactants examples include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene n-octylphenol ether, polyoxyethylene n-nonylphenol ether, polyethylene glycol dilaurate, polyethylene Examples include glycol distearate.
- F top EF301, EF303, EF352 Mitsubishi Materials Electronics Kasei Co., Ltd.
- MegaFuck F171, F173 DIC Corporation
- Florard FC430, FC431 Sumitomo 3M Limited
- Asahi Guard AG710, Surflon S-382, SC101, SC102, SC103, SC104, SC105, SC106 Asahi Glass Co., Ltd.
- KP341 Shin-Etsu Chemical Co., Ltd.
- Polyflow No. 75, no. 95 manufactured by Kyoeisha Chemical Co., Ltd.
- these surfactants may be used individually by 1 type, and may use 2 or more types together.
- the compounding ratio of the surfactant is preferably 2 parts by mass or less with respect to 100 parts by mass of the polymer component (A).
- the radiation-sensitive composition of the present invention can be prepared by dissolving a raw material composition in which the above-described components are mixed in a solvent component (C) and then filtering with a filter having a pore size of about 0.2 ⁇ m.
- Negative resist pattern forming method The radiation-sensitive composition of the present invention is particularly useful as a chemically amplified resist. Below, the formation method of a negative resist pattern using the radiation sensitive composition of this invention is demonstrated.
- a resist film made of the radiation-sensitive composition (composition solution) of the present invention is formed on a substrate.
- the formed resist film is irradiated with radiation that has passed through the hole portion of the mask placed on the optical path to be exposed.
- the acidic group in a polymer (A1) reacts with a crosslinking agent (D) by the effect
- the exposed portion of the resist film having the crosslinked polymer (A1) has low solubility in an alkaline developer.
- the resist film is developed using an alkaline developer, that is, the unexposed portion of the resist film is dissolved and removed by the developer, whereby a negative resist pattern can be formed.
- the resist pattern forming method will be described more specifically below.
- a resist film is formed by applying the composition solution 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. .
- the resist film is exposed through a mask designed to form a predetermined resist pattern.
- a heat treatment PB: Pre-Bake
- the radiation used for exposure visible light, ultraviolet light, far ultraviolet light, X-rays, charged particle beams and the like can be appropriately selected.
- ArF excimer laser wavelength 193 nm
- KrF excimer laser wavelength 248 nm
- a far ultraviolet ray represented by the formula (1) is preferable, and a KrF excimer laser (wavelength 248 nm) is particularly preferable.
- PEB Post-Exposure Bake
- the heating conditions for PEB vary depending on the composition of the radiation-sensitive composition, but are preferably 30 to 200 ° C, and more preferably 50 to 170 ° C.
- a protective film can be provided on the resist film as disclosed in, for example, Japanese Patent Laid-Open No. 5-188598.
- a predetermined resist pattern can be obtained by developing the unexposed portion of the resist film.
- the developer used for development include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, aqueous ammonia, ethylamine, n-propylamine, diethylamine, and di-n-propylamine.
- alkaline aqueous solution in which at least one selected from the group consisting of alkaline compounds such as [4.3.0] -5-nonene is dissolved is preferable.
- concentration of the alkaline aqueous solution is preferably 10% by mass or less. If the concentration of the alkaline aqueous solution is more than 10% by mass, the unexposed area may be dissolved in the developer.
- an organic solvent can be added to the developer.
- 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 Alcohols such as -propyl alcohol, i-propyl alcohol, n-butyl alcohol, t-butyl alcohol, cyclopentanol, cyclohexanol, 1,4-hexanediol, 1,4-hexanedimethylol; tetrahydrofuran, dioxane, etc.
- ketones such as acetone, methyl ethyl ketone, methyl i-butyl ketone, cyclopentanone, cyclohexanone, 3-methylcyclopentanone, and 2,6-dimethylcycl
- Examples include ethers; esters such as ethyl acetate, n-butyl acetate, and i-amyl acetate; aromatic hydrocarbons such as toluene and xylene; phenol, acetonylacetone, and dimethylformamide.
- these organic solvents can be used alone or in combination of two or more.
- the content ratio of the organic solvent is preferably 100 parts by volume or less with respect to 100 parts by volume of the alkaline aqueous solution.
- the content ratio of the organic solvent is more than 100 parts by volume, the developability is lowered, and there is a possibility that the undeveloped portion of the exposed part increases.
- an appropriate amount of a surfactant exemplified as an additive for the radiation-sensitive composition of the present invention can be added to the developer.
- the “line and space pattern (1L1S)” is a resist pattern in which a plurality of rectangular convex portions (line portions) formed on a substrate are arranged in parallel.
- Part is a resist pattern in which the width between the convex part and the convex part (space part) is equal.
- FIG. 1 is a cross-sectional view schematically showing the influence of standing waves in the line portion of the resist pattern.
- an acid generator B-1 as an acid generator (B) and 1 part by weight of an acid generator (B-5)
- a solvent (C1-1) as a solvent (C1)
- This homogeneous solution was filtered through a membrane filter having a pore size of 0.2 ⁇ m to obtain a composition solution.
- PB was performed at 90 ° C. for 60 seconds to form a resist film of Example 1 having a film thickness of 0.2 ⁇ m.
- NSR-S203B (trade name) manufactured by Nikon Corporation, numerical aperture 0.68) was used for the obtained resist film of Example 1, and a KrF excimer laser having a wavelength of 248 nm was used.
- PEB was performed at 120 ° C. for 60 seconds.
- it developed by the paddle method for 60 seconds at 23 degreeC using 2.38 mass% tetramethylammonium hydroxide aqueous solution.
- the resist pattern of Example 1 was formed by washing with pure water for 30 seconds and drying.
- Table 1 shows the formulation of the composition solution prepared to form the resist pattern of Example 1.
- Examples 2 to 25, Comparative Examples 1 to 10 Composition solutions of Examples 2 to 25 and Comparative Examples 1 to 10 were obtained in the same manner as Example 1 except that the formulation shown in Table 1 or 2 was used. Using these composition solutions, resist patterns of Examples 2 to 25 and Comparative Examples 1 to 10 were formed in the same manner as in Example 1. Each resist pattern was subjected to various evaluations, and the results are shown in Table 3 or Table 4.
- B-1 Triphenylsulfonium p-toluenesulfonate
- B-2 Triphenylsulfonium-2,4-difluorobenzenesulfonate
- B-3 2,4,6-trimethylphenyldiphenylsulfonium-2,4-difluorobenzenesulfonate
- B-4 Triphenylsulfonium 10-camphorsulfonate
- B-5 Triphenylsulfonium trifluoromethanesulfonate
- B-6 Diphenyl-4-hydroxyphenylsulfonium trifluoromethanesulfonate
- B-7 N- (trifluoromethanesulfonyloxy) bicyclo [2 2.1] Hept-5-ene-2,3-dicarboximide
- the resist films of Examples 1 to 25 were excellent in sensitivity and resolution, and the resulting resist patterns of Examples 1 to 25 were also improved by the influence of standing waves.
- the resist patterns of Comparative Examples 1 to 10 do not contain the solvent (C1-a), (C1-b), or (C1-c). Under the influence of the standing wave, irregularities derived from the standing wave were confirmed on the side walls of the resist pattern, and the resist pattern was confirmed to be broken or collapsed.
- the radiation-sensitive composition of the present invention is useful as a resist material suitable for fine processing using various types of radiation such as ultraviolet rays, far ultraviolet rays, X-rays, and charged particle beams.
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Abstract
Description
本発明の感放射線性組成物は、重合体成分(A)と、感放射線性酸発生剤(B)と、溶剤成分(C)と、を含む感放射線性組成物である。以下、その詳細について説明する。
重合体成分(A)は、酸性基を有する重合体(A1)、及び酸性基が酸解離性基によって保護された基を有する重合体(A2)の少なくとも一方の重合体を含有する重合体成分である。本発明の感放射線性組成物はこのような重合体成分(A)を含むことにより、以下のように、ポジ型のレジストパターン、ネガ型のレジストパターンのいずれをも形成することができる感放射線性組成物である。
重合体成分(A)は、前記一般式(a1)で表されるような、フェノール性水酸基を有する繰り返し単位(a1)を有する重合体(A1)を含有していることが好ましい。
重合体成分(A)は、例えば、フェノール性水酸基、カルボキシル基等の酸性基が酸解離性基で保護された基を有する重合体(A2)を含有していても良い。本発明の感放射線性組成物は、このような重合体(A2)を含有させることにより、現像時におけるレジストの現像液への溶解速度を上げることができる。即ち、本発明の感放射線性組成物中の重合体(A2)の含有量を調節することにより、現像時におけるレジストの現像液への溶解速度をコントロールし、矩形性の良好なパターンを得ることができる。
酸発生剤(B)としては、下記一般式(B3)で表されるようなヨードニウム塩化合物、又は下記一般式(B4)で表されるようなスルホニウム塩化合物等のオニウム塩化合物を使用するのが好ましい。
本発明の感放射線性組成物は、上述の重合体成分(A)及び酸発生剤(B)を、また、必要に応じて後述する各成分を、溶剤成分(C)に溶解させたものである。
溶剤成分(C)は、溶剤(C1)を含有するものである。溶剤(C1)は、前記一般式(C1-a)で表される溶剤(C1-a)、(C1-b)で表される溶剤(C1-b)、及び(C1-c)で表される溶剤(C1-c)からなる群より選択される少なくとも一種の溶剤である。なお、これら溶剤(C1-a)、溶剤(C1-b)、及び溶剤(C1-c)の沸点は、どれも165℃以上である。
溶剤成分(C)は、上述の溶剤(C1)以外にもその他の溶剤(以下、「溶剤(C2)」とも記載する)を含有していても良い。
本発明の感放射線性組成物は、ネガ型のレジストパターンを形成可能な感放射線性組成物である場合、架橋剤(D)を更に含んでいることが好ましい。即ち、本発明の感放射線性組成物は、架橋剤(D)を含み、且つ、重合体成分(A)中の前記重合体(A1)の含有割合が重合体成分(A)の合計の50~100質量%であることにより、ネガ型のレジストパターンを形成することができる。本発明の感放射線性組成物は、架橋剤(D)を含むことにより、放射線照射された際、酸発生剤(B)から生成する酸の触媒作用により、架橋剤(D)の架橋反応が進行し、重合体(A)の分子相互間及び同一分子内で架橋し、アルカリ現像液に対する溶解性が低い架橋重合体が形成されるため、現像後にネガ型のレジストパターンを形成することができる。
本発明の感放射線性組成物は、酸拡散制御剤(以下、「酸拡散制御剤(E)」とも記載する)を更に含んでいても良い。酸拡散制御剤(E)は、放射線照射により酸発生剤(B)から生成する酸が、レジスト膜中で拡散することを抑制し、非露光領域における好ましくない化学反応、即ち、非露光領域の酸解離性基を有する重合体の酸解離性基を脱離させてしまう反応(脱保護反応)を抑制する作用を有する成分である。
本発明の感放射線性組成物は、上述の各成分の他にも、各種添加剤を更に含んでいても良い。このような添加剤としては、例えば、感放射線性組成物の塗布性やストリエーション性、レジストとしての現像性等を改良する作用を示す界面活性剤等を挙げることができる。
本発明の感放射線性組成物は、上述の各成分を混合した原料組成物を、溶剤成分(C)に溶解した後、孔径0.2μm程度のフィルターでろ過することにより調製することができる。
本発明の感放射線性組成物は、特に化学増幅型レジストとして有用である。以下に、本発明の感放射線性組成物を用いたネガ型のレジストパターンの形成方法について説明する。
設計寸法が0.15μmであるライン・アンド・スペースパターン(1L1S)を形成した際、得られるレジストパターンのライン部の線幅とスペース部の幅とが1対1となる場合の露光量を最適露光量とし、この最適露光量を感度として評価した。評価結果を表3または表4中の、「感度(mJ/cm2)」の列に示す。
上記「感度」の評価方法にて定義した最適露光量で露光した際に解像されるレジストパターンの最小の線幅、即ち最小寸法(μm)を、解像度として評価した。評価結果を表3または表4中の、「解像度(μm)」の列に示す。
調製後、23℃で6ヶ月間保管した組成物溶液を用いてレジストパターンを形成した。このレジストパターンが、調製した直後の組成物溶液を用いて形成したレジストパターンと比較して、解像度及びパターン形状に変化が認められず、且つ、設計寸法が0.15μmであるライン・アンド・スペースパターン(1L1S)の最適露光量の変化が±2%未満である場合を「良」と評価し、表3または表4中「A」で示し、解像度及びパターン形状に変化が認められず、且つ、設計寸法が0.15μmであるライン・アンド・スペースパターン(1L1S)の最適露光量の変化が±2~5%である場合を「可」と評価し、表3または表4中「B」で示し、解像度及びパターン形状の少なくとも一方に変化が認められるか、又は、設計寸法が0.15μmであるライン・アンド・スペースパターン(1L1S)の最適露光量の変化が±5%超である場合を「不可」と評価し、表3または表4中「C」で示す。
最適露光量における、設計寸法0.15μmのライン・アンド・スペースパターン(1L1S)の断面形状を日立ハイテクノロージズ社製の超高分解能電界放出形走査電子顕微鏡(商品名「S-4800」)を用いて観察し、図1に示すラインのaとbに該当する線幅を測長した。aは最も張り出している部分の線幅(μm)であり、bは最もくびれている部分の線幅(μm)である。そして、b/aで導かれる計算値が0.8以上の場合を「A」、0.6以上0.8未満の場合を「B」、0.6未満、又はレジストパターンの倒れ、折れが確認できる場合、若しくは0.15μmのライン・アンド・スペースパターンが解像されなかった場合を「C」と定義し、表3または表4中の「定在波による影響の改善」の列に示した。なお、図1は、レジストパターンのライン部における定在波による影響を模式的に示す断面図である。
重合体(A1)として重合体(A1-1)(p-ヒドロキシスチレン/スチレン共重合体:共重合モル比=8:2、Mw=4,000、分散度Mw/Mn=1.5)100質量部と、酸発生剤(B)として酸発生剤(B-1)3質量部及び酸発生剤(B-5)1質量部と、溶剤(C1)として溶剤(C1-1)50質量部と、溶剤(C2)として溶剤(C2-1)700質量部及び溶剤(C2-2)300質量部と、架橋剤(D)として架橋剤(D-1)7質量部と、酸拡散制御剤(E)として酸拡散制御剤(E-1)30質量部と、を混合して均一溶液とした。この均一溶液を、孔径0.2μmのメンブレンフィルターでろ過し、組成物溶液を得た。この組成物溶液をシリコンウェハ上に回転塗布した後、90℃で60秒間PBを行い、膜厚0.2μmである実施例1のレジスト膜を形成した。
表1又は表2に示す配合処方としたこと以外は、実施例1と同様にして、実施例2~25及び比較例1~10の組成物溶液を得た。これらの組成物溶液を用いて、実施例1と同様にして、実施例2~25及び比較例1~10のレジストパターンを形成した。それぞれのレジストパターンについて、各種評価を行い、結果を表3又は表4に示した。
A1-1:p-ヒドロキシスチレン/スチレン共重合体(共重合モル比=8:2、Mw=4,000、分散度=1.5)
A1-2:p-ヒドロキシスチレン/スチレン共重合体(共重合モル比=7:3、Mw=4,000、分散度=1.5)
A2-1:p-ヒドロキシスチレン/スチレン/p-t-ブトキシスチレン共重合体(共重合モル比=77:5:18、Mw=16,000、分散度=1.7)
A2-2:p-ヒドロキシスチレン/スチレン/p-t-ブトキシスチレン共重合体(共重合モル比=67:5:28、Mw=16,000、分散度=1.7)
B-1:トリフェニルスルホニウムp-トルエンスルホネート
B-2:トリフェニルスルホニウム-2,4-ジフルオロベンゼンスルホンネート
B-3:2,4,6-トリメチルフェニルジフェニルスルホニウム-2,4-ジフルオロベンゼンスルホンネート
B-4:トリフェニルスルホニウム10-カンファースルホネート
B-5:トリフェニルスルホニウムトリフルオロメタンスルホネート
B-6:ジフェニル-4-ヒドロキシフェニルスルホニウムトリフルオロメタンスルホネート
B-7:N-(トリフルオロメタンスルホニルオキシ)ビシクロ[2.2.1]ヘプト-5-エン-2,3-ジカルボキシイミド
C1-1:ジエチレングリコールジエチルエーテル(沸点:189℃)
C1-2:ジエチレングリコールモノエチルエーテルアセテート(沸点:217℃)
C1-3:ジプロピレングリコールモノメチルエーテルアセテート(沸点:213℃)
C1-4:δ-バレロラクトン(沸点:230℃)
C1-5:4-エチル-1,3-ジオキサン-2-オン(沸点:251℃)
C1-6:γ―ブチロラクトン(沸点:204℃)
C1-7:プロピレンカーボネート(沸点:240℃)
C2-1:乳酸エチル(沸点:155℃)
C2-2:プロピレングリコールモノメチルエーテルアセテート(沸点:146℃)
D-1:1,3,4,6-テトラキス(メトキシメチル)グリコールウリル
E-1:トリオクチルアミン
E-2:3-ピペリジノ-1,2-プロパンジオール
E-3:2-フェニルベンズイミダゾール
E-4:トリフェニルスルホニウムサリチレート
Claims (6)
- 酸性基、及び酸性基が酸解離性基によって保護された基の少なくとも一方を有する重合体を含有する重合体成分(A)と、
感放射線性酸発生剤(B)と、
下記一般式(C1-a)で表される溶剤、下記一般式(C1-b)で表される溶剤、及び下記一般式(C1-c)で表される溶剤からなる群より選択される少なくとも一種である溶剤(C1)を含有する溶剤成分(C)と、を含む感放射線性組成物。
- 前記溶剤成分(C)中、前記溶剤(C1)の含有割合が、前記溶剤成分(C)の合計の0.01~30質量%である請求項1に記載の感放射線性組成物。
- 前記繰り返し単位(a1)が、ヒドロキシスチレンに由来する繰り返し単位である請求項3に記載の感放射線性組成物。
- 前記重合体成分(A)が、酸性基が酸解離性基で保護された基を有する重合体(A2)を含有する請求項1~4のいずれか一項に記載の感放射線性組成物。
- 前記重合体成分(A)中、前記重合体(A1)の含有割合が、前記重合体成分(A)の合計の50~100質量%であり、且つ
架橋剤(D)を更に含有し、
ネガ型のレジストパターンを形成可能な請求項3~5のいずれか一項に記載の感放射線性組成物。
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JP2014074898A (ja) * | 2012-09-11 | 2014-04-24 | Sumitomo Chemical Co Ltd | レジスト組成物及びレジストパターンの製造方法 |
US10656521B2 (en) * | 2014-11-26 | 2020-05-19 | Hitachi Chemical Company, Ltd. | Photosensitive resin composition, photosensitive element, cured product, semiconductor device, method for forming resist pattern, and method for producing circuit substrate |
WO2020218062A1 (ja) * | 2019-04-24 | 2020-10-29 | Jsr株式会社 | 感光性樹脂組成物、レジストパターン膜の製造方法、およびメッキ造形物の製造方法 |
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TWI743143B (zh) * | 2016-08-10 | 2021-10-21 | 日商Jsr股份有限公司 | 半導體用抗蝕劑底層膜形成組成物、抗蝕劑底層膜、抗蝕劑底層膜的形成方法及圖案化基板的製造方法 |
SG11202112009UA (en) * | 2019-05-20 | 2021-12-30 | Merck Patent Gmbh | A negative tone lift off resist composition comprising an alkali soluble resin and a photo acid generator, and a method for manufacturing metal film patterns on a substrate. |
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US20130108965A1 (en) | 2013-05-02 |
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