WO2010007874A1 - 第1膜の改質方法及びこれに用いる酸転写樹脂膜形成用組成物 - Google Patents
第1膜の改質方法及びこれに用いる酸転写樹脂膜形成用組成物 Download PDFInfo
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- WO2010007874A1 WO2010007874A1 PCT/JP2009/061886 JP2009061886W WO2010007874A1 WO 2010007874 A1 WO2010007874 A1 WO 2010007874A1 JP 2009061886 W JP2009061886 W JP 2009061886W WO 2010007874 A1 WO2010007874 A1 WO 2010007874A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/095—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having more than one photosensitive layer
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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
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
-
- 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
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/38—Treatment before imagewise removal, e.g. prebaking
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
Definitions
- the present invention relates to a method for modifying a first film and a composition for forming an acid transfer resin film used therefor. More specifically, the present invention relates to a first film modification method for modifying a first film by using a second film, and more particularly, a modification of a first film that does not contain an acid generator in a first film to be patterned. The present invention relates to a method and an acid transfer resin film forming composition used therefor.
- a pattern forming method using a radiation sensitive resin composition containing a resin having an acid dissociable functional group and an acid generator is known.
- an acid is generated from the acid generator by exposure, and a property that a predetermined functional group is dissociated from the resin having the acid-dissociable functional group by the acid and becomes alkali-soluble is utilized.
- Patent Document 1 a method is known in which a resist material is liquefied with a solvent and then discharged from an inkjet head to a required portion to directly form a pattern. In this method, since no photolithography is used, the resist material does not contain an acid generator.
- the radiation-sensitive resin composition exhibits its function by including both an acid generator and a resin having an acid-dissociable functional group.
- a composition in which the generator and its residues are not left behind is required.
- a new pattern forming method is required.
- the present invention has been made in view of the above circumstances, and a first film modification method for modifying a first film using a second film, in particular, an acid generator is contained in a first film to be a pattern.
- An object of the present invention is to provide a method for modifying a first film, which can be patterned using an existing photolithographic process, and a composition for forming an acid transfer resin film used therefor.
- the present invention is as follows. [1] (I) a second film forming step of forming a second film as an acid transfer resin film containing a radiation-sensitive acid generator on the first film having an acid dissociable group; (II) exposing the second film through a mask and generating an acid in the second film; (III) an acid transfer step of transferring the acid generated in the second film to the first film; (IV) A first film modification method comprising: a second film removal step of removing the second film in this order. [2] The method for modifying a first film according to [1], further including (V) an alkaline solution contact step of bringing the first film into contact with an alkaline solution after the second film removal step.
- R 2 and R 3 each independently represent a hydrogen atom, a linear or branched hydrocarbon group having 1 to 10 carbon atoms, or a carbon number of 3 Represents a cyclic hydrocarbon group of ⁇ 10, and R 2 and R 3 are bonded to each other to form a 3- to 10-membered monocyclic heterocycle having a nitrogen atom, an oxygen atom, a sulfur atom, or a selenium atom. You may do it.) [5] The method for modifying a first film according to [4], wherein the polymer (B) further includes a structural unit represented by the following formula (2). (In the formula, R 4 represents a hydrogen atom or a methyl group.
- R 5 represents a monovalent organic group.
- the radiation sensitive acid generator (A) is contained in 20 to 100 parts by mass with respect to 100 parts by mass of the polymer (B) in the second film.
- a second film forming step of forming a second film as an acid transfer resin film containing a radiation sensitive acid generator On the first film having an acid dissociable group, A second film forming step of forming a second film as an acid transfer resin film containing a radiation sensitive acid generator; (II) exposing the second film through a mask and generating an acid in the second film; (III) an acid transfer step of transferring the acid generated in the second film to the first film; (IV) A composition for forming an acid transfer resin film for forming the acid transfer resin film used in the first film reforming method comprising the second film removing step of removing the second film in this order. Because (A) A composition for forming an acid transfer resin film comprising the radiation-sensitive acid generator and (B) a polymer having a nitrogen-containing group in a side chain.
- R 1 represents a hydrogen atom or a methyl group.
- R 2 and R 3 each independently represent a hydrogen atom, a linear or branched hydrocarbon group having 1 to 10 carbon atoms, or a carbon number of 3 Represents a cyclic hydrocarbon group of ⁇ 10, and R 2 and R 3 are bonded to each other to form a 3- to 10-membered monocyclic heterocycle having a nitrogen atom, an oxygen atom, a sulfur atom, or a selenium atom.
- the first film can be modified using the second film.
- the first film can be modified using an existing photolithography process.
- the modified state of the first film can be revealed.
- a development step of developing using an alkaline developer is provided, a pattern based on the presence or absence of a resin (the presence or absence of a resin in which a part of the first film remains and the other part is removed) can be obtained.
- the above formula is used even if the pattern has a small line / space.
- the polymer (B) has the structural unit represented by the above formula (1), even if the pattern has a small line / space, the polymer (B) has the structure of the above formula (1), so Since necessary diffusion can be suppressed, a finer pattern can be resolved.
- the polymer (B) further has a structural unit represented by the above formula (2), the transfer efficiency of the generated acid can be better controlled.
- the first film of the present invention is particularly effective. Advantages obtained by this modification method can be obtained. In the case of a pattern forming method for imparting a pattern to the first film, the advantage of the first film modification method of the present invention can be obtained particularly effectively.
- the composition for forming an acid transfer resin film of the present invention the first film can be modified using the second film. In particular, even if the first film does not contain an acid generator, the first film can be modified using an existing photolithography process.
- the polymer (B) has the structural unit represented by the above formula (1), even if the pattern has a small line / space, the polymer (B) has the structure of the above formula (1), so Since necessary diffusion can be suppressed, a finer pattern can be resolved.
- the polymer (B) further has a structural unit represented by the following formula (2), the transfer efficiency of the generated acid can be better controlled.
- the radiation-sensitive acid generator (A) is contained in an amount of 20 to 100 parts by mass with respect to 100 parts by mass of the polymer (B), it is particularly effective in the first film modification method of the present invention. Can be obtained.
- (meth) acryl means acryl and methacryl
- (meth) acrylate means acrylate and methacrylate.
- Second film (acid transfer resin film) forming step (I) is a step of forming an acid transfer resin film on the first film.
- this second film forming step (I) includes an acid transfer resin film on the patterning film. This is an acid transfer resin film forming step for forming the film.
- the first film is a film having an acid dissociable group.
- the acid dissociable group may be contained in any manner in the first film, but is usually contained as a part of the polymer serving as the substrate. That is, the first film usually contains a polymer having an acid-dissociable group (acid-dissociable group-containing polymer) ⁇ that is, for example, a resin having an acid-dissociable group (hereinafter simply referred to as “acid-dissociable group-containing polymer”). Resin ”) ⁇ .
- the first film may have the protective group, and may be a polymer film (acid-dissociable group-containing polymer film), a monomolecular film (acid-dissociable group-containing monomolecular film), a resin film (acid-dissociable).
- a film such as a group-containing resin film).
- the first film undergoes steps (I) to (VI), so that the acid dissociable group of the first film is dissociated (removed) by the acid transferred from the second film. That is, the modification that the acid dissociable group of the first film is dissociated from the first film is performed.
- the first film includes a first film before modification (first film before modification) and a first film after modification (first film after modification). is there.
- the first film examples include a patterning film to be patterned.
- the patterning film is a resin film containing an acid-dissociable group-containing resin, and is usually a resin film not containing a radiation-sensitive acid generator.
- the patterning film is alkali-insoluble or alkali-insoluble, and becomes alkali-soluble when the acid-dissociable group is dissociated from the acid-dissociable group-containing resin.
- alkali-insoluble or alkali-insoluble means 50% of the initial film thickness of the film when the film using only the acid-dissociable group-containing resin is developed under alkaline development conditions in the examples described later. This means the remaining properties.
- “alkali-soluble” means the property of being dissolved in excess of 50% under the above conditions.
- the patterning film includes a patterning film before patterning (that is, a patterning film) and a patterning film after patterning (that is, a pattern). That is, the patterning film becomes a “pattern” composed of a portion where the acid has been transferred and a portion where the acid has not been transferred, through the steps (I) to (VI). Furthermore, by performing the alkaline solution contact step (V) as necessary, the portion where the acid has been transferred is removed, so that the portion where the acid is not transferred and the portion where the acid has been transferred (for example, under the layer) In the case of providing a substrate, a “pattern” can be formed. When the alkaline solution is a developer, this step is a development step (V).
- the “acid-dissociable group” is a group that dissociates in the presence of an acid, more specifically an acidic group, and more specifically, a phenolic hydroxyl group.
- a group that replaces a hydrogen atom in an acidic group such as a carboxyl group, a sulfonic acid group, a phosphoric acid group, or an acidic hydroxyl group.
- Examples of the acid dissociable group include t-butoxycarbonyl group, tetrahydropyranyl group, tetrahydrofuranyl group, (thiotetrahydropyranylsulfanyl) methyl group, (thiotetrahydrofuranylsulfanyl) methyl group, alkoxy-substituted methyl group, alkylsulfanyl group.
- Examples thereof include a substituted methyl group, an acetal group, a hemiacetal group, a group represented by the following general formula (3) (hereinafter referred to as “acid-dissociable group (3)”), and the like.
- each R is independently a linear or branched alkyl group having 1 to 14 carbon atoms or a non-bridged or bridged monovalent fat having 3 to 20 carbon atoms.
- a alicyclic hydrocarbon group is formed, and the remaining R is a linear or branched alkyl group having 1 to 14 carbon atoms or a non-bridged or bridged monovalent alicyclic ring having 3 to 20 carbon atoms And each of these groups may be substituted.
- alkoxy-substituted methyl group examples include methoxymethyl group, ethoxymethyl group, methoxyethoxymethyl group, n-propoxymethyl group, n-butoxymethyl group, n-pentyloxymethyl group, n-hexyloxymethyl group, benzyl An oxymethyl group etc. can be mentioned.
- alkylsulfanyl-substituted methyl group examples include a methylsulfanylmethyl group, an ethylsulfanylmethyl group, a methoxyethylsulfanylmethyl group, an n-propylsulfanylmethyl group, an n-butylsulfanylmethyl group, an n-pentylsulfanylmethyl group, Examples thereof include an n-hexylsulfanylmethyl group and a benzylsulfanylmethyl group.
- examples of the linear or branched alkyl group having 1 to 14 carbon atoms represented by R include a methyl group, an ethyl group, an n-propyl group, an I-propyl group, an n-butyl group, 2-methylpropyl group, n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, n-tridecyl group And n-tetradecyl group.
- substituent for the alkyl group examples include a hydroxyl group, a carboxyl group, an oxo group ( ⁇ O), a cyano group, a halogen atom (eg, a fluorine atom, a chlorine atom, etc.), a straight chain having 1 to 8 carbon atoms, Branched alkoxyl group (for example, methoxy group, ethoxy group, n-propoxy group, i-propoxy group, n-butoxy group, 2-methylpropoxy group, 1-methylpropoxy group, t-butoxy group, etc.), carbon number 2-8 linear or branched alkoxyalkoxyl group (eg, methoxymethoxy group, ethoxymethoxy group, t-butoxymethoxy group, etc.), linear or branched alkylcarbonyloxy group having 2-8 carbon atoms (For example, methylcarbonyloxy group, ethylcarbonyloxy group, t-butylcarbonyloxy group having
- Examples of the non-bridged or bridged monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms of R in the general formula (3) include, for example, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and cyclohexyl.
- a cycloalkyl group such as a cycloheptyl group and a cyclooctyl group; a bicyclo [2.2.1] heptyl group, a bicyclo [2.2.2] octyl group, a tetracyclo [4.2.0.1 2,5 . 1 7,10 ] dodecyl group, adamantyl group and the like.
- Examples of the substituent of the monovalent alicyclic hydrocarbon group of R in the general formula (3) and the divalent alicyclic hydrocarbon group formed by bonding any two Rs to each other include: Hydroxyl group, carboxyl group, oxo group ( ⁇ O), cyano group, halogen atom (eg, fluorine atom, chlorine atom, etc.), linear or branched alkyl group having 1 to 14 carbon atoms (eg, methyl group, Ethyl group, n-propyl group, i-propyl group, n-butyl group, 2-methylpropyl group, 1-methylpropyl group, t-butyl group, etc.), linear or branched having 1 to 8 carbon atoms Alkoxyl group (for example, methoxy group, ethoxy group, n-propoxy group, i-propoxy group, n-butoxy group, 2-methylpropoxy group, 1-methylpropoxy group, t-butoxy group, etc.), C 2-8 Linear or
- cyanomethyl group 2-cyanoethyl group, 3-cyanopropyl group, 4- 1 or more or 1 or more types of C1-C14 linear or branched fluoroalkyl groups (for example, fluoromethyl group, trifluoromethyl group, pentafluoroethyl group, etc.) be able to.
- acid dissociable group (3) is t-butyl groups and the following formulas (3-1) to (3-20) (where each m is an integer of 0 to 2). Groups and the like.
- the acid dissociable group may be contained in any manner within the acid dissociable group-containing resin.
- the structural unit represented by the following general formula (4) (hereinafter simply referred to as “acid dissociable group-containing unit”). It is preferable that it is included as a part.
- R 6 represents a hydrogen atom or a methyl group.
- X represents an acid dissociable group.
- the acid-dissociable group-containing unit may be contained in any way within the acid-dissociable group-containing resin.
- an acid-dissociable group-containing monomer it can be obtained by polymerizing the resin.
- the monomer having an acid dissociable group include t-butyl (meth) acrylate, 1,1-dimethyl-propyl (meth) acrylate, 1,1-dimethyl-butyl (meth) acrylate, 2- Cyclohexylpropyl (meth) acrylate, 1,1-dimethyl-phenyl (meth) acrylate, tetrahydropyranyl (meth) acrylate, 2-t-butoxycarbonylmethyl (meth) acrylate, 2-benzyloxycarbonylethyl (meth) acrylate, Examples include 2-methyladamantyl (meth) acrylate, 1,1-dimethyl-3-oxobutyl (meth) acrylate, and 2-benz
- the ratio of the acid dissociable group-containing unit is not particularly limited, but when the total structural unit of the acid dissociable group-containing resin is 100 mol%, it is preferably 5 to 95 mol%, and 10 to 90 mol%. More preferably, it is particularly preferably 15 to 80 mol%. When the ratio of the acid dissociable group-containing unit in the acid dissociable group-containing resin is within the above range, a sufficient exposure margin (exposure margin) can be secured.
- the acid-dissociable group-containing resin usually has other structural units.
- other structural units include structural units having an acidic group such as a phenolic hydroxyl group.
- the solubility of the first film in the alkaline solution (more specifically, the patterning film in the developer) can be adjusted.
- Monomers that give structural units having a phenolic hydroxyl group include p-isopropenylphenol, m-isopropenylphenol, o-isopropenylphenol, p-hydroxystyrene, m-hydroxystyrene, o-hydroxystyrene, p- And phenolic hydroxyl group-containing compounds such as hydroxymethacrylamide. These phenolic hydroxyl group-containing compounds may be used alone or in combination of two or more.
- the ratio is not particularly limited, but when the total structural unit of the acid-dissociable group-containing resin is 100 mol%, the ratio is 1 It is preferably from ⁇ 50 mol%, more preferably from 3 to 45 mol%, particularly preferably from 5 to 40 mol%.
- the proportion of the structural unit derived from the phenolic hydroxyl group-containing compound in the acid-dissociable group-containing resin is within the above range, the solubility of the first film in the alkaline solution (alkali dissolution) when the alkaline solution contact step (V) is performed. ) Can be adjusted. That is, more specifically, the solubility (alkali solubility) of the patterning film in the developer when performing the development step (V) can be adjusted.
- the amount of the acid dissociable group-containing resin constituting the patterning film is not particularly limited, but when the entire patterning film is 100% by mass, the acid dissociable group-containing resin is 10 to 99.9% by mass. It is preferably 30 to 99.9% by mass, more preferably 50 to 99.9% by mass.
- a dissolution (alkali dissolution) contrast in the developing solution when performing the developing step (V) can be provided (dissolving difference in the developing solution is provided). be able to)
- the resin is derived from a polyfunctional monomer having two or more polymerizable unsaturated bonds.
- a branched structure can be introduced by a structural unit and / or an acetal crosslinking group. By introducing such a branched structure, the heat resistance of the acid-dissociable group-containing resin can be improved.
- the introduction rate of the branched structure in the acid-dissociable group-containing resin can be appropriately selected depending on the branched structure and the type of the resin into which the branched structure is introduced. Preferably there is.
- the molecular weight of the acid-dissociable group-containing resin is not particularly limited and may be appropriately selected.
- the polystyrene-reduced weight molecular weight (hereinafter referred to as “Mw”) measured by gel permeation chromatography (GPC) is usually used. 1,000 to 500,000, preferably 2,000 to 400,000, and more preferably 3,000 to 300,000.
- Mw of the acid-dissociable group-containing resin having no branched structure is preferably 1,000 to 150,000, more preferably 3,000 to 100,000, and the acid-dissociable group-containing resin having a branched structure is contained.
- the Mw of the resin is preferably 5,000 to 500,000, more preferably 8,000 to 300,000.
- the ratio (Mw / Mn) between the Mw of the acid-dissociable group-containing resin and the polystyrene equivalent number molecular weight (hereinafter referred to as “Mn”) measured by GPC is not particularly limited and can be appropriately selected. 1 to 10, preferably 1 to 8, and more preferably 1 to 5.
- the method for producing the acid-dissociable group-containing resin is not particularly limited.
- a method of introducing one or more acid-dissociable groups into acidic groups in an alkali-soluble resin produced in advance; 1 having an acid-dissociable group A method of polymerizing one or more polymerizable unsaturated monomers, optionally together with other polymerizable unsaturated monomers; one or more polycondensable components having acid dissociable groups, optionally It can be produced by a polycondensation method together with a condensable component.
- Polymerization of the polymerizable unsaturated monomer and the polymerization of one or more polymerizable unsaturated monomers having an acid dissociable group in the production of the alkali-soluble resin are carried out by using the polymerizable unsaturated monomer used Depending on the type of reaction medium, etc., a polymerization initiator such as a radical polymerization initiator, an anionic polymerization catalyst, a coordination anion polymerization catalyst, a cationic polymerization catalyst, or a polymerization catalyst is appropriately selected, bulk polymerization, solution polymerization, precipitation polymerization, The polymerization can be carried out in an appropriate polymerization form such as emulsion polymerization, suspension polymerization, bulk-suspension polymerization and the like.
- the polycondensation of one or more polycondensable components having an acid dissociable group can be preferably carried out in an aqueous medium or a mixed medium of water and a hydrophilic solvent in the presence of an acidic catalyst
- the patterning film may be formed in any way, but is usually formed by applying a liquid patterning film forming composition on the surface of a substrate or the like and drying it.
- the patterning film forming composition can make the entire composition liquid by containing a solvent.
- the following solvent (C) which can be contained in the composition for forming an acid transfer resin film described later can be used. Only 1 type may be used for a solvent and it may use 2 or more types together.
- the solvent contained in the patterning film forming composition and the solvent contained in the acid transfer resin film forming composition may be the same or different.
- the viscosity of the entire patterning film forming composition is not particularly limited, and may be set to an appropriate viscosity by a method of applying the patterning film forming composition.
- the viscosity at a temperature of 25 ° C. is 1 to 100 mPa ⁇ s. s.
- This viscosity is preferably 2 to 80 mPa ⁇ s, more preferably 3 to 50 mPa ⁇ s.
- the composition for forming a patterning film can contain other components.
- other components include surfactants.
- the surfactant the following surfactant (D) that can be contained in the composition for forming an acid transfer resin film described later can be used. Only one type of surfactant may be used, or two or more types may be used in combination. Further, the surfactant contained in the patterning film forming composition and the surfactant contained in the acid transfer resin film forming composition may be the same or different.
- the amount is not particularly limited, but is usually 0.01 to 1 part by mass with respect to 100 parts by mass of the total amount of the acid dissociable group-containing resin.
- the amount is preferably 0.02 to 0.8 parts by mass.
- a crosslinking agent, an antihalation agent, a storage stabilizer, a colorant, a plasticizer, an antifoaming agent, and the like can be appropriately added to the patterning film forming composition.
- the patterning film may be formed on the surface of any member, but is usually formed on the surface of various substrates.
- the substrate material include silicon, various metals (aluminum, etc.), various metal (aluminum, etc.) sputtered films, alumina, glass epoxy, paper phenol, glass, and the surface of these substrates. Examples include modified substrates.
- the thickness of the substrate is usually 1000 to 10,000 nm. Further, the thickness of the formed patterning film is not particularly limited, but is usually 1 to 1000 nm, preferably 5 to 500 nm, and more preferably 10 to 100 nm.
- the application means of the composition for forming a patterning film is not particularly limited, and examples thereof include appropriate application means such as spin coating, cast coating, and roll coating.
- coating the composition for patterning film formation you may form a patterning film by volatilizing the solvent in a coating film by pre-baking (PB) as needed.
- PB pre-baking
- the heating conditions for this pre-baking are appropriately selected depending on the composition of the composition for forming a patterning film.
- the heating temperature is usually about 30 to 150 ° C., preferably 50 to 130 ° C.
- the heating time is usually 30 to 300 seconds, preferably 60 to 180 seconds.
- Second film (acid transfer resin film)
- the “second film” is a resin film containing the radiation-sensitive acid generator (A), and is an acid transfer resin film.
- Radioactive acid generator (A) The “radioactive acid generator (A)” (hereinafter also simply referred to as “acid generator (A)”) is a component that generates an acid upon exposure. This acid generator (A) generates an acid by exposure in an acid transfer resin film (that is, an acid generator-containing resin film).
- the acid in the second film that is, the acid transfer resin film
- the first film for example, the patterning film
- the group is dissociated (in the patterning film, the acid dissociable group is dissociated from the acid-dissociable group-containing resin), and the portion of the first film (the acid transfer portion of the first film) becomes alkali-soluble.
- the part or the whole of the first film to which the acid is transferred is modified. That is, in the patterning film, the patterning film has a pattern in which an alkali-soluble part and an alkali-insoluble part are formed. Further, by performing development using an alkali developer or the like as necessary, the alkali-soluble portion can be removed, and a pattern consisting of only the alkali-insoluble portion can be formed.
- the acid generator (A) is only required to generate an acid by exposure, and can be variously selected according to the type of radiation used. This radiation is appropriately selected from ultraviolet rays, far ultraviolet rays (including KrF excimer laser, ArF excimer laser, F 2 excimer laser, etc.), X-rays, electron beams, ⁇ rays, molecular beams, ion beams, and the like.
- this acid generator (A) for example, onium salt compounds (including thiophenium salt compounds), halogen-containing compounds, diazoketone compounds, sulfone compounds, sulfonic acid compounds, sulfonimide compounds, diazomethane compounds, and the like can be used.
- This acid generator (A) may use only 1 type and may use 2 or more types together.
- onium salt compound examples include thiophenium salt compounds, iodonium salt compounds, sulfonium salt compounds, phosphonium salt compounds, diazonium salt compounds, and pyridinium salt compounds.
- thiophenium salt compound examples include 4,7-di-n-butoxynaphthyltetrahydrothiophenium salt compounds such as 4,7-di-n-butoxynaphthyltetrahydrothiophenium trifluoromethanesulfonate; 1- (4-n-butoxynaphthalen-1-yl) tetrahydrothiophenium trifluoromethanesulfonate, 1- (4-n-butoxynaphthalen-1-yl) tetrahydrothiophenium nonafluoro-n-butanesulfonate, (4-n-Butoxynaphthalen-1-yl) tetrahydrothiophenium perfluoro-n-octanesulfonate, 1- (4-n-butoxynaphthalen-1-yl) tetrahydrothiophenium 2-bicyclo [2.2.
- iodonium salt compound examples include bis (4-t-butylphenyl) iodonium trifluoromethanesulfonate, bis (4-t-butylphenyl) iodonium nonafluoro-n-butanesulfonate, and bis (4-t-butylphenyl) iodonium per Fluoro-n-octanesulfonate, bis (4-t-butylphenyl) iodonium 2-bicyclo [2.2.1] hept-2-yl-1,1,2,2-tetrafluoroethanesulfonate, bis (4- bis (4-tert-butylphenyl) iodonium salt compounds such as t-butylphenyl) iodonium camphorsulfonate;
- diphenyliodonium salt compounds such as 2-tetrafluoroethanesulfonate, diphenyli
- sulfonium salt compounds include triphenylsulfonium trifluoromethanesulfonate, triphenylsulfonium nonafluoro-n-butanesulfonate, triphenylsulfonium perfluoro-n-octanesulfonate, triphenylsulfonium 2-bicyclo [2.2.1] hept. -Triphenylsulfonium salt compounds such as 2-yl-1,1,2,2-tetrafluoroethanesulfonate, triphenylsulfonium camphorsulfonate, triphenylsulfonium hexafluorophosphate;
- 4-cyclohexylphenyldiphenylsulfonium trifluoromethanesulfonate 4-cyclohexylphenyldiphenylsulfonium nonafluoro-n-butanesulfonate, 4-cyclohexylphenyldiphenylsulfonium perfluoro-n-octanesulfonate, 4-cyclohexylphenyldiphenylsulfonium 2-bicyclo [2.
- 4-cyclohexylphenyldiphenylsulfonium salt compounds such as hept-2-yl-1,1,2,2-tetrafluoroethanesulfonate and 4-cyclohexylphenyldiphenylsulfonium camphorsulfonate;
- 4-methanesulfonylphenyldiphenylsulfonium trifluoromethanesulfonate 4-methanesulfonylphenyldiphenylsulfonium nonafluoro-n-butanesulfonate, 4-methanesulfonylphenyldiphenylsulfonium perfluoro-n-octanesulfonate, 4-methanesulfonylphenyldiphenylsulfonium 2-
- 4-methanesulfonylphenyl diphenylsulfonium salt compounds such as bicyclo [2.2.1] hept-2-yl-1,1,2,2-tetrafluoroethanesulfonate, 4-methanesulfonylphenyldiphenylsulfonium camphorsulfonate, and the like. It is done.
- halogen-containing compound examples include haloalkyl group-containing hydrocarbon compounds and haloalkyl group-containing heterocyclic compounds.
- diazoketone compound examples include a 1,3-diketo-2-diazo compound, a diazobenzoquinone compound, a diazonaphthoquinone compound, and the like. Specific examples include 1,2-naphthoquinone diazide-4-sulfonic acid ester of phenols, 1,2-naphthoquinone diazide-5-sulfonic acid ester of phenols, and the like.
- sulfonated product examples include ⁇ -ketosulfone, ⁇ -sulfonylsulfone, and ⁇ -diazo compounds of these compounds. Specific examples include 4-tolylphenacyl sulfone, mesityl phenacyl sulfone, bis (phenylsulfonyl) methane, and the like.
- sulfonic acid compounds examples include alkyl sulfonic acid esters, haloalkyl sulfonic acid esters, aryl sulfonic acid esters, and imino sulfonates. Specific examples include benzoin tosylate, pyrogallol tris trifluoromethane sulfonate, o-nitrobenzyl trifluoromethane sulfonate, o-nitrobenzyl-p-toluene sulfonate, and the like.
- sulfonimide compound examples include N- (trifluoromethylsulfonyloxy) succinimide, N- (trifluoromethylsulfonyloxy) phthalimide, N- (trifluoromethylsulfonyloxy) diphenylmaleimide, N- (trifluoromethylsulfonyl).
- diazomethane compound examples include bis (trifluoromethylsulfonyl) diazomethane, bis (cyclohexylsulfonyl) diazomethane, bis (phenylsulfonyl) diazomethane, bis (p-toluenesulfonyl) diazomethane, methylsulfonyl-p-toluenesulfonyldiazomethane, and cyclohexyl.
- examples include sulfonyl-1,1-dimethylethylsulfonyldiazomethane, bis (1,1-dimethylethylsulfonyl) diazomethane, and the like.
- onium salt compounds are preferable, thiophenium salt compounds are more preferable, 4,7-di-n-butoxynaphthyltetrahydrothiophenium salt compounds are particularly preferable, and Is particularly preferably 4,7-di-n-butoxynaphthyltetrahydrothiophenium trifluoromethanesulfonate.
- the second film usually contains a polymer (B) as described later, in addition to the radiation-sensitive acid generator (A).
- the content of the acid generator is not particularly limited, but from the viewpoint of ensuring transferability as the second film, it is usually 0.1 to 200 parts by weight, preferably 100 parts by weight of the polymer (B). Is in the range of 10 to 150 parts by weight, particularly preferably 20 to 200 parts by weight. When the content of the acid generator (A) is in the above range, a resin film excellent in acid transferability can be obtained.
- the second film (acid transfer resin film) is not particularly limited with respect to the configuration other than the acid generator (A), but usually contains a polymer (B).
- the type of the polymer (B) is not particularly limited, and may be, for example, an acrylic polymer, an epoxy polymer, or a silicone polymer. Among these, an acrylic polymer is preferable from the viewpoint of the resolution of the finally obtained pattern.
- the polymer (B) is preferably a polymer having a nitrogen-containing group in the side chain.
- a polymer having a nitrogen-containing group when an acid is generated from the acid generator (A), it is possible to prevent unnecessary diffusion of acid in the second film (acid transfer resin film). (That is, it functions as an acid diffusion preventing resin). For this reason, unintended acid transfer (acid diffusion) to other layers (particularly, the first film) can also be prevented, sensitivity can be improved, and resolution of the resulting pattern can be improved.
- the nitrogen-containing group means a substituent containing a nitrogen atom in the group.
- the nitrogen-containing group include a group having a structure of —NR 1 R 2 (hereinafter simply referred to as “amine group”), an acid group, an imide group, a urea group, a urethane group, and a pyridine group. Of these, amine groups are preferred.
- R 1 and R 2 of the amine group each independently represent a hydrogen atom, a linear or branched hydrocarbon group having 1 to 10 carbon atoms, or a cyclic hydrocarbon group having 3 to 10 carbon atoms.
- R 1 and R 2 of the amine group are bonded to each other to form a 3 to 10-membered monocyclic hetero ring, or at least one selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, and a selenium atom.
- R 1 and R 2 of the amine group are bonded to each other to form a 3 to 10-membered monocyclic hetero ring, or at least one selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, and a selenium atom.
- R 1 and R 2 of the amine group when R 1 and R 2 of the amine group is a linear or branched hydrocarbon group having 1 to 10 carbon atoms, R 1 and R 2 of the amine group include a methyl group, an ethyl group, And aliphatic hydrocarbon groups such as n-propyl group, i-propyl group, n-butyl group, 2-methylpropyl group, 1-methylpropyl group and t-butyl group.
- R 1 and R 2 of the amine group is R 1 and R 2 of the amine group in the case where a cyclic hydrocarbon group having 3 to 10 carbon atoms, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloalkyl Alicyclic groups such as heptyl and cyclooctyl groups; aromatic groups such as phenyl, o-tolyl, m-tolyl, p-tolyl, 4-t-butylphenyl, 1-naphthyl and benzyl Groups.
- R 1 and R 2 of the amine group are bonded to each other to form a 3- to 10-membered monocyclic heterocycle (which may be an unsaturated ring or a saturated ring).
- examples of the amine group include an aziridino group, an azetino group, a pyrrolidino group, a pyrrole group, a piperidino group, and a pyridino group.
- R 1 and R 2 of the amine group are bonded via at least one heteroatom selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom and a selenium atom to form a 4- to 10-membered monocyclic heterocycle
- the amine group may be a morpholino group, a thiomorpholino group, a selenomorpholino group, an isoxazolidino group, an iso group. Examples thereof include an oxazole group, an isothiazolidino group, an isothiazole group, an imidazolidino group, a piperazino group, and a triazino group.
- the amino group may be included in the side chain of the polymer (B) in any form, but is preferably included in the polymer (B) as a structural unit represented by the following formula (1). That is, the polymer (B) is preferably a resin (B ′) having a structural unit represented by the following formula (1).
- R 1 represents a hydrogen atom or a methyl group.
- R 2 and R 3 each independently represents a hydrogen atom, a linear or branched hydrocarbon group having 1 to 10 carbon atoms, or a cyclic hydrocarbon group having 3 to 10 carbon atoms.
- R 2 and R 3 may combine with each other to form a 3- to 10-membered monocyclic heterocycle having a nitrogen atom, an oxygen atom, a sulfur atom, or a selenium atom.
- the polymer (B) has the structural unit represented by the general formula (1), when the acid is generated from the acid generator, unnecessary diffusion in the second film (acid transfer resin film). (That is, it functions as an acid diffusion preventing resin). For this reason, unintended acid transfer (acid diffusion) to the patterning film can be prevented, and the resolution of the resulting pattern can be improved.
- the structural unit represented by the general formula (1) may be contained in the polymer (B) in any way.
- the monomer represented by the following general formula (5) (Bm1 ) To polymerize the polymer (B).
- R 1 is a hydrogen atom or a methyl group
- R 2 and R 3 are each independently a hydrogen atom, a linear or branched hydrocarbon having 1 to 10 carbon atoms. And a cyclic hydrocarbon group having 3 to 10 carbon atoms.
- R 2 and R 3, taken together, a nitrogen atom, an oxygen atom, a sulfur atom, may form a monocyclic heterocyclic ring of 3 to 10 membered ring having selenium atom.
- Examples of the linear or branched hydrocarbon group having 1 to 10 carbon atoms that is R 2 and / or R 3 in the general formula (5) include, for example, a methyl group, an ethyl group, an n-propyl group, i Examples thereof include aliphatic hydrocarbon groups such as -propyl group, n-butyl group, 2-methylpropyl group, 1-methylpropyl group and t-butyl group. That is, the monomer (Bm1) in which R 2 and / or R 3 in the general formula (5) is a linear or branched hydrocarbon group having 1 to 10 carbon atoms is N, N-dimethyl.
- (Meth) acrylamide, N, N-diethyl (meth) acrylamide, N-isopropyl (meth) acrylamide and the like can be mentioned.
- Examples of the cyclic hydrocarbon group having 3 to 10 carbon atoms that is R 2 and / or R 3 in the general formula (5) include a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group.
- An alicyclic hydrocarbon group; aromatic groups such as phenyl group, o-tolyl group, m-tolyl group, p-tolyl group, 4-t-butylphenyl group, 1-naphthyl group, benzyl group and the like can be mentioned.
- a 3- to 10-membered monocyclic heterocycle having a nitrogen atom, an oxygen atom, a sulfur atom, or a selenium atom formed by bonding R 2 and R 3 in the general formula (5) to each other is formed.
- the monomer (Bm1) include N- (meth) acryloylmorpholine.
- R 2 and R 3 are bonded to each other to form a 3- to 10-membered monocyclic heterocycle having a nitrogen atom, an oxygen atom, a sulfur atom, or a selenium atom.
- R 2 and R 3 are bonded to each other to form a 3- to 10-membered monocyclic heterocycle, or at least selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, and a selenium atom It represents a bond formed through a single heteroatom to form a 4-10 membered monocyclic heterocycle.
- the monomer (Bm1) among the various monomers, N, N-dimethylacrylamide, N, N-dimethylmethacrylamide, N-acryloylmorpholine, and N-methacryloylmorpholine are preferable.
- the polymer (B) obtained using these preferred monomers can obtain a particularly excellent anti-diffusion effect in the production method of the present invention.
- the proportion of the structural unit represented by the general formula (1) in the polymer (B) is not particularly limited, but is 1 to 50 mol when the total structural unit of the polymer (B) is 100 mol%. %, More preferably 3 to 40 mol%, particularly preferably 5 to 30 mol%.
- the proportion of the structural unit represented by the general formula (1) in the polymer (B) is within the above range, the anti-diffusion effect can be particularly suitably obtained in the modification method of the present invention.
- the polymer (B) can contain other structural units in addition to the structural unit represented by the formula (1).
- the other structural unit is preferably a structural unit represented by the following formula (2).
- R 4 represents a hydrogen atom or a methyl group.
- R 5 represents a monovalent organic group.
- the structural unit represented by the general formula (2) may be contained in the polymer (B) in any manner.
- the monomer represented by the following general formula (6) (Bm2 ) Can be used to obtain a polymer (B) containing the structural unit represented by the general formula (2).
- R 4 represents a hydrogen atom or a methyl group.
- R 5 represents a monovalent organic group.
- Examples of the monovalent organic group for R 5 include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a 2-methylpropyl group, a 1-methylpropyl group, and a t-butyl group.
- Cyano group cyanomethyl group, 1-cyanoethyl group, 2-cyanoethyl group, 1-cyanopropyl group, 2-cyanopropyl group, 3-cyanopropyl group, 1-cyanobutyl group, 2-cyanobutyl group, 3-cyanobutyl group, 4
- a nitrogen atom-containing organic group such as a cyanoalkyl group such as a cyanobutyl group, a 3-cyanocyclopentyl group or a 4-cyanocyclohexyl group;
- R 5 may be the acid dissociable group (X) constituting the general formula (4), but R 5 is preferably not an acid dissociable group.
- the monomer (Bm2) is preferably a (meth) acrylate compound, specifically, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, glycerol mono (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) ) Acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, tricyclodecanyl (meth) acrylate, and the like.
- These (meth) acrylate compounds may be used alone or in combination of two or more. Of these (meth) acrylate compounds, methyl meth
- the proportion of the structural unit represented by the general formula (2) in the polymer (B) is not particularly limited, but is 5 to 99 mol when the total structural unit of the polymer (B) is 100 mol%. %, Preferably 10 to 97 mol%, more preferably 15 to 95 mol%.
- the proportion of the structural unit represented by the general formula (2) in the polymer (B) is within the above range, the anti-diffusion effect can be particularly suitably obtained in the modification method of the present invention.
- This second film may be formed in any way, but is usually formed by applying a liquid acid transfer resin film forming composition onto the surface of the patterning film and drying it.
- the composition for forming an acid transfer resin film can make the entire composition liquid by containing a solvent (C).
- the kind of said solvent (C) is not specifically limited, For example, water and / or an organic solvent etc. can be used. These may use only 1 type and may use 2 or more types together.
- the organic solvent include propylene glycol monomethyl ether, propylene glycol monoethyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol.
- Diethyl ether diethylene glycol ethyl methyl ether, dipropyl ether, diisopropyl ether, butyl methyl ether, butyl ethyl ether, butyl propyl ether, dibutyl ether, diisobutyl ether, tert-butyl-methyl ether, tert-butyl ethyl ether, tert-butylpropyl ether, di-tert-butyl ether, dipentyl ether, diisoamyl ether, cyclopentyl methyl ether, cyclohexyl methyl ether, cyclopentyl ethyl ether, cyclohexyl ethyl ether, cyclopentyl propyl ether, cyclopentyl-2-propyl ether, cyclohexyl propyl ether, Alkyl ethers such as cyclohexyl-2
- This solvent (C) is usually contained in an amount of 10 to 10000 parts by weight, preferably 20 to 8000 parts by weight, based on 100 parts by weight of the polymer (B) in the composition for forming an acid transfer resin film. 30 to 6000 parts by mass is more preferable, and 40 to 4000 parts by mass is still more preferable.
- the viscosity of the entire composition for forming an acid transfer resin film is not particularly limited, and may be set to an appropriate viscosity by a method of applying the composition for forming an acid transfer resin film, which will be described later, for example, at a temperature of 25 ° C.
- the viscosity can be 1 to 100 mPa ⁇ s. This viscosity is preferably 2 to 80 mPa ⁇ s, more preferably 3 to 50 mPa ⁇ s.
- composition for forming an acid transfer resin film may contain other components in addition to the solvent (C).
- Surfactant (D) is mentioned as another component.
- the surfactant (D) include nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, silicone surfactants, polyalkylene oxide surfactants, and fluorine-containing surfactants. Surfactant etc. are mentioned.
- polyoxyethylene lauryl ether polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene n-octylphenyl ether, polyoxyethylene n-nonylphenyl ether, polyethylene glycol dilaurate, polyethylene glycol distearate NBX-7, NBX-8, NBX-15 (trade name, manufactured by Neos), SH8400 FLUID (trade name, manufactured by Toray Dow Corning Silicon Co.), KP341 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) ), Polyflow No. 75, no.
- the amount thereof is not particularly limited, but is usually 0.01 to 0.5 parts by mass, preferably 0 with respect to 100 parts by mass of the total amount of the polymer (B). 0.02 to 0.1 parts by mass.
- a crosslinking agent an antihalation agent, a storage stabilizer, a colorant, a plasticizer, an antifoaming agent, and the like can be appropriately added to the acid transfer resin film forming composition.
- the means for applying the composition for forming an acid transfer resin film is not particularly limited, and examples thereof include appropriate application means such as spin coating, cast coating, and roll coating. Furthermore, after apply
- PB pre-baking
- the heating conditions for this pre-baking are appropriately selected depending on the composition of the composition for forming an acid transfer resin film, but the heating temperature is usually about 30 to 150 ° C., preferably 50 to 130 ° C. Further, the heating time is usually 30 to 300 seconds, preferably 60 to 180 seconds.
- the thickness of the second film formed on the first film is not particularly limited, but is usually preferably 1 to 10000 nm, more preferably 5 to 800 nm, and more preferably 10 to More preferably, it is 500 nm.
- Exposure step (II) is a step of exposing the second film through a mask to generate an acid in the second film. As a result, as illustrated in FIG. 1, the exposed portion of the second film 20 becomes the acid generation portion 21.
- the type of radiation used for exposure is not particularly limited, and depending on the type of acid generator contained in the second film, LED lamps, ultraviolet rays (including g-rays, i-rays, etc.), deep ultraviolet rays (KrF excimer) laser, comprising an ArF excimer laser, F 2 excimer laser, etc.), X-rays, electron beams, gamma-rays, molecular beams, is suitably selected from the ion beam or the like. Further, the exposure amount and the like are appropriately selected according to the type of the acid generator contained in the second film.
- the acid transfer step (III) is a step of transferring the acid generated in the second film to the first film.
- the method for transferring the acid is not particularly limited. Specifically, (1) a method for transferring by heating, (2) a method for transferring by standing at room temperature, and (3) a transfer using osmotic pressure. The method etc. are mentioned. These methods may be used alone or in combination of two or more. Among these methods, (1) the method of transferring by heating is preferable because of excellent transfer efficiency.
- the heating conditions for transferring by heating are not particularly limited, but the heating temperature is preferably 31 to 200 ° C, more preferably 70 to 150 ° C. Furthermore, the heating time is preferably 30 to 300 seconds, more preferably 60 to 180 seconds. In addition, when transferring by heating, it may be completed by one heating depending on the above heating conditions, but as a result, two or more heatings may be performed so as to obtain the same result as the above heating conditions. it can.
- the method of transferring by allowing to stand at room temperature is a method in which the acid generated in the second film is removed by leaving it in a normal temperature environment of 20 to 30 ° C. without heating. This is a method of transferring by naturally diffusing into the first film.
- Second film removal step (IV) is a step of removing the second film. That is, it is a step of removing the second film and exposing a first film (for example, a patterning film) having an acid transferred below the second film.
- the removal may be performed by any method, but is usually performed by dissolving the second film with an organic solvent. This organic solvent dissolves the second film, but does not dissolve the first film to which the acid has been transferred.
- Such an organic solvent is preferably selected as appropriate depending on the resin composition of the second film and the first film, and is not limited as long as the first film is not dissolved and the second film is dissolved. Specific examples include acetonitrile, acetone, tetrahydrofuran, pyridine and the like. These organic solvents may use only 1 type and may use 2 or more types together.
- the acid is transferred by performing a series of steps from the second film formation step (I) to the second film removal step (IV) in this order.
- the pattern consists of a portion where the acid is not transferred and a portion where the acid is not transferred.
- an alkaline solution contact process (especially development process) (V) can be further performed.
- the alkaline solution contact development step (V) is performed, the portion (11 in FIG. 1) to which the acid obtained in the steps up to (IV) has been transferred is the first film (10 in FIG. 1). )
- a pattern (12 in FIG. 1) composed of the remaining portion of the first film and the portion from which the first film has been removed.
- Alkaline solution contact step (V) is a step of bringing the first film into contact with an alkaline solution after the second film removing step (for example, a step of developing using an alkaline developer). In other words, as illustrated in FIG. 1, this is a step of obtaining the pattern 12 by removing the acid transfer site 11 formed in the first film 10.
- alkaline solution examples include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, aqueous ammonia, ethylamine, n-propylamine, diethylamine, and di-n-.
- the concentration of the alkaline compound contained in the alkaline solution is not particularly limited, but is preferably 0.1 to 5% by mass, and more preferably 0.3 to 3% by mass.
- the solvent which comprises the said alkaline solution is not specifically limited, Water and / or an organic solvent are mentioned.
- the 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; ethers such as tetrahydrofuran and dioxane And the like; esters such as ethyl acetate, n-butyl acetate and i-amyl acetate; aromatic hydrophile, benzyl
- a patterned first film is obtained by performing a series of steps from the second film formation step (I) to the alkaline solution contact step (V) in this order.
- a series of steps from the second film formation step (I) to the alkaline solution contact step (V) can be repeated.
- processes other than this alkaline solution contact process (V) do not need to be provided, other processes can also be provided.
- the modified first film after the alkaline solution contact process ⁇ that is, for example, a patterning film (a part of the patterning film remaining after the acid-transferred part is removed) ⁇ The water washing process etc. which wash with water are mentioned.
- composition for forming an acid transfer resin film The same as the composition for forming an acid transfer resin film described in the above [1] modification method. That is, the composition for forming an acid transfer resin film of the present invention comprises (I) a first film having an acid dissociable group, A second film forming step of forming a second film as an acid transfer resin film containing a radiation sensitive acid generator; (II) exposing the second film through a mask and generating an acid in the second film; (III) an acid transfer step of transferring the acid generated in the second film to the first film; (IV) A composition for forming an acid transfer resin film for forming the acid transfer resin film used in the first film reforming method comprising the second film removing step of removing the second film in this order.
- the radiation-sensitive acid generator and (B) a polymer having a nitrogen-containing group in the side chain are contained. Furthermore, the polymer (B) can have a structural unit represented by the formula (1). In addition, the polymer (B) may have a structural unit represented by the formula (2). Furthermore, the radiation sensitive acid generator (A) can be contained in an amount of 20 to 100 parts by mass with respect to 100 parts by mass of the polymer (B).
- the obtained acid-dissociable group-containing resin 100 parts by mass
- NBX-15 manufactured by Neos
- propylene glycol monomethyl ether acetate 2000 parts by mass
- this solution was filtered through a capsule filter having a pore size of 0.5 ⁇ m to obtain a patterning film forming composition.
- the polymer B1 is a resin having a structural unit represented by the formula (1).
- Synthesis Example 2 ⁇ Synthesis of Polymer B2>
- 10 g of N, N-dimethylacrylamide (Monomer Bm1, manufactured by Kojin Co., Ltd.) in Synthesis Example 1 and 90 g of methyl methacrylate (Monomer Bm2, manufactured by Mitsubishi Materials Corporation) were used.
- a polymer B2 was obtained.
- Mw of the obtained polymer B2 was 10,000.
- the polymer B2 is a resin having a structural unit represented by the formula (1).
- Synthesis Example 3 ⁇ Synthesis of Polymer B3>
- 20 g of N, N-dimethylacrylamide (Monomer Bm1, manufactured by Kojin Co., Ltd.) in Synthesis Example 1 and 80 g of methyl methacrylate (Monomer Bm2, manufactured by Mitsubishi Materials Corporation) were used.
- a polymer B3 was obtained.
- Mw of the obtained polymer B3 was 9,000.
- the polymer B3 is a resin having a structural unit represented by the formula (1).
- Synthesis Example 4 ⁇ Synthesis of Polymer B4>
- N N-dimethylacrylamide in Synthesis Example 1 is replaced with acryloylmorpholine (monomer Bm1, manufactured by Kojin Co., Ltd.) represented by the following general formula (8).
- Mw of the obtained polymer B4 was 9,500.
- the polymer B4 is a resin having a structural unit represented by the formula (1).
- Blending of each monomer in polymer B1 to polymer B8 (A) N, N-dimethylacrylamide (b) acryloylmorpholine (c) methyl methacrylate (d) isobornyl acrylate
- Patterning resin film formation process The composition for patterning film formation obtained by said [1] was apply
- Exposure process (II) Ultraviolet light of 100 to 1000 mJ / cm 2 using an ultra high pressure mercury lamp (manufactured by OSRAM, model “HBO”, output 1,000 W) on the surface of the acid transfer film obtained in (2) above through a pattern mask. Irradiated with light. The amount of exposure was confirmed by an illuminometer (manufactured by Oak Manufacturing Co., Ltd., model “UV-M10” (illuminance meter) connected to model “probe UV-35” (receiver)).
- Acid transfer film removal step (IV) The laminate obtained up to (4) was immersed in acetonitrile for 30 seconds to remove only the acid transfer resin film.
- Development step (V) Development was performed by immersing the laminate obtained up to (5) above in a 2.38 mass% tetramethylammonium hydroxide aqueous solution at room temperature for 1 minute. Thereafter, it was washed with running water and blown with nitrogen to obtain a pattern.
- the substrate on which this pattern is formed is referred to as a “patterning substrate”.
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Abstract
Description
尚、下記特許文献1に示されるように、レジスト材料を溶媒により液状化した上で、必要な箇所にインクジェット式ヘッドから吐出させてパターンを直接的に形成する方法が知られている。この方法ではフォトリソを用いないためにレジスト材料に酸発生剤が含有されていない。
本発明は、前記実情に鑑みてなされたものであり、第2膜を用いて第1膜を改質する第1膜の改質方法、特に、パターンとなる第1膜に酸発生剤が含有されなくとも既存のフォトリソのプロセスを用いてパターン形成できる第1膜の改質方法及びこれに用いる酸転写樹脂膜形成用組成物を提供することを目的とする。
[1](I)酸解離性基を有する第1膜上に、感放射線性酸発生剤を含有する酸転写樹脂膜としての第2膜を形成する第2膜形成工程と、
(II)マスクを介して前記第2膜に露光し、前記第2膜に酸を発生させる露光工程と、
(III)前記第2膜に発生した前記酸を前記第1膜に転写する酸転写工程と、
(IV)前記第2膜を除去する第2膜除去工程と、をこの順に備えることを特徴とする第1膜の改質方法。
[2]前記第2膜除去工程の後に、(V)前記第1膜をアルカリ性溶液と接触させるアルカリ性溶液接触工程を備える前記[1]に記載の第1膜の改質方法。
[3]前記第2膜は、(A)前記感放射線性酸発生剤と、(B)側鎖に含窒素基を有する重合体とを含有する前記[1]又は[2]に記載の第1膜の改質方法。
[4]前記重合体(B)は、下記式(1)に示す構造単位を有する前記[3]に記載の第1膜の改質方法。
[5]前記重合体(B)は、更に、下記式(2)に示す構造単位を有する前記[4]に記載の第1膜の改質方法。
[6]前記第2膜内において前記感放射線性酸発生剤(A)は、前記重合体(B)100質量部に対して20~100質量部含まれる前記[3]乃至[5]のうちのいずれかに記載の第1膜の改質方法。
[7]前記第1膜に対してパターンを付与するパターン形成方法である前記[1]乃至[6]のうちのいずれかに記載の第1膜の改質方法。
[8](I)酸解離性基を有する第1膜上に、
感放射線性酸発生剤を含有する酸転写樹脂膜としての第2膜を形成する第2膜形成工程と、
(II)マスクを介して前記第2膜に露光し、該第2膜に酸を発生させる露光工程と、
(III)前記第2膜に発生した前記酸を前記第1膜に転写する酸転写工程と、
(IV)前記第2膜を除去する第2膜除去工程と、をこの順に備えた第1膜の改質方法に用いられる前記酸転写樹脂膜を形成するための酸転写樹脂膜形成用組成物であって、
(A)前記感放射線性酸発生剤と、(B)側鎖に含窒素基を有する重合体とを含有することを特徴とする酸転写樹脂膜形成用組成物。
[9]前記重合体(B)は、下記式(1)に示す構造単位を有する前記[8]に記載の酸転写樹脂膜形成用組成物。
[10]前記重合体(B)は、更に、下記式(2)に示す構造単位を有する前記[9]に記載の酸転写樹脂膜形成用組成物。
[11]前記感放射線性酸発生剤(A)は、前記重合体(B)100質量部に対して20~100質量部含まれる前記[8]乃至[10]のうちのいずれかに記載の酸転写樹脂膜形成用組成物。
前記第2膜除去工程の後に、(V)前記第1膜膜をアルカリ性溶液と接触させるアルカリ性溶液接触工程を備える場合は、第1膜の改質状態を顕在化させることができる。特に、アルカリ性現像液を用いて現像する現像工程を備える場合は、樹脂の有無(第1膜の一部が残存され他部が除去されてなる樹脂の有無)によるパターンを得ることができる。
前記第2膜が、(A)前記感放射線性酸発生剤と、(B)側鎖に含窒素基を有する重合体とを含有する場合は、ライン/スペースが小さいパターンであっても上記式(1)の構造を有することで、発生された酸の不必要な拡散を抑えることができるため、より微細なパターンの解像が可能となる。
前記重合体(B)が、上記式(1)に示す構造単位を有する場合は、ライン/スペースが小さいパターンであっても上記式(1)の構造を有することで、発生された酸の不必要な拡散を抑えることができるため、より微細なパターンの解像が可能となる。
前記重合体(B)が、更に、上記式(2)に示す構造単位を有する場合は、発生された酸の転写効率をより良くコントロールすることができる。
前記第2膜内において前記感放射線性酸発生剤(A)が、前記重合体(B)100質量部に対して20~100質量部含まれる場合は、特に効果的に本発明の第1膜の改質方法による利点を得ることができる。
前記第1膜に対してパターンを付与するパターン形成方法である場合は、特に効果的に本発明の第1膜の改質方法による利点を得ることができる。
本発明の酸転写樹脂膜形成用組成物によれば、第2膜を用いて第1膜を改質することができる。特に第1膜に酸発生剤が含有されなくとも既存のフォトリソのプロセスを用いて第1膜の改質を行うことができる。
前記重合体(B)が、上記式(1)に示す構造単位を有する場合は、ライン/スペースが小さいパターンであっても上記式(1)の構造を有することで、発生された酸の不必要な拡散を抑えることができるため、より微細なパターンの解像が可能となる。
前記重合体(B)が、更に、下記式(2)に示す構造単位を有する場合は、発生された酸の転写効率をより良くコントロールすることができる。
前記感放射線性酸発生剤(A)が、前記重合体(B)100質量部に対して20~100質量部含まれる場合は、特に効果的に本発明の第1膜の改質方法による利点を得ることができる。
(II);露光工程、
(III);酸転写工程、
(IV);第2膜除去工程(酸転写樹脂膜除去工程)、
(V);アルカリ性溶液接触工程(現像工程)、
10;第1膜(パターニング膜)、11;酸転写部位、
20;第2膜(酸転写樹脂膜)、21;酸発生部位、30;マスク。
[1]第1膜の改質方法
本発明の第1膜の改質方法は、図1に例示するように、
(I)酸解離性基を有する第1膜10上に、感放射線性酸発生剤を含有する酸転写樹脂膜としての第2膜20を形成する第2膜形成工程と、
(II)マスク30を介して前記第2膜20に露光し、前記第2膜20に酸を発生させる露光工程と、
(III)前記第2膜20に発生した前記酸を前記第1膜10に転写する酸転写工程と、
(IV)前記第2膜20を除去する第2膜除去工程と、をこの順に備える。
第2膜形成工程(I)は、第1膜上に酸転写樹脂膜を形成する工程である。特に第1膜が後述するパターンニング樹脂膜であると共に、第2膜が後述する酸転写樹脂膜である場合には、この第2膜形成工程(I)は、パターニング膜上に酸転写樹脂膜を形成する酸転写樹脂膜形成工程となる。
第1膜は、酸解離性基を有する膜である。酸解離性基は、第1膜内にどのようにして含まれてもよいが、通常、基体となる高分子の一部として含まれる。即ち、第1膜は、通常、酸解離性基を有する高分子(酸解離性基含有高分子)を含む{即ち、例えば、酸解離性基を有する樹脂(以下、単に「酸解離性基含有樹脂」という)など}。この第1膜としては、前記保護基を有すればよく、高分子膜(酸解離性基含有高分子膜)、単分子膜(酸解離性基含有単分子膜)、樹脂膜(酸解離性基含有樹脂膜)等の膜が含まれる。
尚、第1膜とは、改質される前の第1膜(改質前第1膜)と、改質された後の第1膜(改質後第1膜)と、を含む意味である。
前記「酸解離性基」は、酸の存在下で解離する基であり、より具体的には酸性の基であり、更に詳しくは、フェノール性水酸基、カルボキシル基、スルホン酸基、リン酸基、酸性を有する水酸基等の酸性基中の水素原子を置換する基を意味する。この酸解離性基としては、t-ブトキシカルボニル基、テトラヒドロピラニル基、テトラヒドロフラニル基、(チオテトラヒドロピラニルスルファニル)メチル基、(チオテトラヒドロフラニルスルファニル)メチル基や、アルコキシ置換メチル基、アルキルスルファニル置換メチル基、アセタール基、ヘミアセタール基、下記一般式(3)で表される基(以下、「酸解離性基(3)」という。)等を挙げることができる。
この場合、酸解離性基含有樹脂中の分岐構造の導入率は、該分岐構造やそれが導入される樹脂の種類により適宜選定することができるが、全構造単位に対して10モル%以下であることが好ましい。
また、分岐構造をもたない酸解離性基含有樹脂のMwは、好ましくは1,000~150,000、更に好ましくは3,000~100,000であり、分岐構造を有する酸解離性基含有樹脂のMwは、好ましくは5,000~500,000、更に好ましくは8,000~300,000である。
酸解離性基含有樹脂のMwとGPCで測定したポリスチレン換算数分子量(以下、「Mn」という。)との比(Mw/Mn)についても特に限定はなく、適宜選定することができるが、通常、1~10、好ましくは1~8、更に好ましくは1~5である。
アルカリ可溶性樹脂を製造する際の重合性不飽和単量体の重合及び酸解離性基を有する1種以上の重合性不飽和単量体の重合は、使用される重合性不飽和単量体や反応媒質の種類等に応じて、ラジカル重合開始剤、アニオン重合触媒、配位アニオン重合触媒、カチオン重合触媒等の重合開始剤或いは重合触媒を適宜に選定し、塊状重合、溶液重合、沈澱重合、乳化重合、懸濁重合、塊状-懸濁重合等の適宜の重合形態で実施することができる。
また、酸解離性基を有する1種以上の重縮合性成分の重縮合は、好ましくは酸性触媒の存在下、水媒質中又は水と親水性溶媒との混合媒質中で実施することができる。
この溶剤としては、後述する酸転写樹脂膜形成用組成物に含有できる下記溶剤(C)を用いることができる。溶剤は1種のみを用いてもよく2種以上を併用してもよい。また、パターニング膜形成用組成物に含有される溶剤と、酸転写樹脂膜形成用組成物に含有される溶剤とは、同じであってもよく異なっていてもよい。
更に、パターニング膜形成用組成物全体の粘度は特に限定されず、パターニング膜形成用組成物を塗布する方法等により適宜の粘度とすればよいが、例えば、温度25℃おける粘度を1~100mPa・sとすることができる。この粘度は2~80mPa・sが好ましく、3~50mPa・sがより好ましい。
パターニング膜形成用組成物に界面活性剤が含有される場合、その量は特に限定されないが、通常、前記酸解離性基含有樹脂の全量100質量部に対して0.01~1質量部であり、好ましくは0.02~0.8質量部である。
更に、その他、パターニング膜形成用組成物には、架橋剤、ハレーション防止剤、保存安定化剤、着色剤、可塑剤、消泡剤等を適宜配合することができる。
更に、形成されたパターニング膜の厚さは特に限定されないが、通常、1~1000nmであり、5~500nmとすることが好ましく、10~100nmとすることが更に好ましい。
更に、パターニング膜形成用組成物を塗布した後、必要に応じて、プレベーク(PB)することによって塗膜中の溶剤を揮発させることでパターニング膜を形成してもよい。このプレベークの加熱条件は、パターニング膜形成用組成物の配合組成によって適宜選択されるが、加熱温度は、通常、30~150℃程度、好ましくは50~130℃である。更に、加熱時間は、通常、30~300秒間、好ましくは60~180秒間である。
前記「第2膜」は、感放射線性酸発生剤(A)を含有する樹脂膜であり、酸転写樹脂膜である。
〈2-1〉感放射性酸発生剤(A)
前記「感放射性酸発生剤(A)」(以下、単に「酸発生剤(A)」ともいう)は、露光により酸を発生する成分である。この酸発生剤(A)は、酸転写樹脂膜(即ち、酸発生剤含有樹脂膜)内において露光により酸を発生させる。そして、酸転写工程において第2膜(即ち、酸転写樹脂膜)内の酸が第1膜(例えば、パターニング膜)へ移動(即ち、酸転)されることで、第1膜から酸解離性基が解離され(パターニング膜においては酸解離性基含有樹脂から酸解離性基が解離され)、第1膜の当該部分(第1膜の酸転写部分)がアルカリ可溶性となる。その結果、酸が転写された第1膜の当該部位又は全体が改質されることとなる。即ち、パターニング膜においては、パターニング膜はアルカリ可溶性部位とアルカリ非可溶性部位とが形成されたパターンとなる。更に、その後、必要に応じてアルカリ現像液等を用いて現像を行うことで、アルカリ可溶性部位を除去でき、アルカリ非可溶性部位のみからなるパターンを形成することができる。
1-(4-n-ブトキシナフタレン-1-イル)テトラヒドロチオフェニウムトリフルオロメタンスルホネート、1-(4-n-ブトキシナフタレン-1-イル)テトラヒドロチオフェニウムノナフルオロ-n-ブタンスルホネート、1-(4-n-ブトキシナフタレン-1-イル)テトラヒドロチオフェニウムパーフルオロ-n-オクタンスルホネート、1-(4-n-ブトキシナフタレン-1-イル)テトラヒドロチオフェニウム2-ビシクロ[2.2.1]ヘプト-2-イル-1,1,2,2-テトラフルオロエタンスルホネート、1-(4-n-ブトキシナフタレン-1-イル)テトラヒドロチオフェニウムカンファースルホネート等の1-(4-n-ブトキシナフタレン-1-イル)テトラヒドロチオフェニウム塩化合物;
前記第2膜(酸転写樹脂膜)は、前記酸発生剤(A)以外の構成については特に限定されないが、通常、重合体(B)を含有する。重合体(B)の種類は特に限定されず、例えば、アクリル系重合体であってもよく、エポキシ系重合体であってもよく、シリコーン系重合体であってもよい。これらのなかでは、最終的に得られるパターンの解像度の点から、アクリル系重合体が好ましい。
これらのなかでは、アミン基が好ましい。前記アミン基のR1及びR2は、それぞれ独立に、水素原子、炭素数1~10の直鎖状又は分枝状の炭化水素基、炭素数3~10の環状の炭化水素基を表す。また、前記アミン基のR1及びR2は互いに結合して、3~10員環の単環式ヘテロ環、又は、窒素原子、酸素原子、硫黄原子、セレン原子の群から選ばれる少なくとも1種のヘテロ原子を介して結合して4~10員環の単環式ヘテロ環を形成してもよい。
即ち、前記一般式(5)においてR2及び/又はR3が炭素数1~10の直鎖状又は分枝状の炭化水素基となる単量体(Bm1)としては、N,N-ジメチル(メタ)アクリルアミド、N,N-ジエチル(メタ)アクリルアミド、N-イソプロピル(メタ)アクリルアミド等が挙げられる。
尚、前記式(4)及び前記(5)において、R2及びR3が互いに結合して、窒素原子、酸素原子、硫黄原子、セレン原子を有する3~10員環の単環式ヘテロ環を形成するとは、換言すれば、R2及びR3が、互いに結合して3~10員環の単環式ヘテロ環、又は、窒素原子、酸素原子、硫黄原子、セレン原子の群から選ばれる少なくとも1種のヘテロ原子を介して結合して4~10員環の単環式ヘテロ環を形成することを表す。
尚、上記R5は、前記一般式(4)を構成する酸解離性基(X)であってもよいが、R5は酸解離性基でないことが好ましい。
これらの(メタ)アクリレート化合物のなかでは、メチルメタクリレートが特に好ましい。
前記有機溶剤としては、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、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールジメチルエーテル、エチレングリコールジエチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールジメチルエーテル、ジエチレングリコールジエチルエーテル、ジエチレングリコールエチルメチルエーテル、ジプロピルエーテル、ジイソプロピルエーテル、ブチルメチルエーテル、ブチルエチルエーテル、ブチルプロピルエーテル、ジブチルエーテル、ジイソブチルエーテル、tert-ブチル-メチルエーテル、tert-ブチルエチルエーテル、tert-ブチルプロピルエーテル、ジ-tert-ブチルエーテル、ジペンチルエーテル、ジイソアミルエーテル、シクロペンチルメチルエーテル、シクロヘキシルメチルエーテル、シクロペンチルエチルエーテル、シクロヘキシルエチルエーテル、シクロペンチルプロピルエーテル、シクロペンチル-2-プロピルエーテル、シクロヘキシルプロピルエーテル、シクロヘキシル-2-プロピルエーテル、シクロペンチルブチルエーテル、シクロペンチル-tert-ブチルエーテル、シクロヘキシルブチルエーテル、シクロヘキシル-tert-ブチルエーテル等のアルキルエーテル類;
デカン、ドデカン、ウンデカン、ベンゼン、トルエン、キシレン等の炭化水素類等が挙げられる。
更に、酸転写樹脂膜形成用組成物全体の粘度は特に限定されず、後述する酸転写樹脂膜形成用組成物を塗布する方法等により適宜の粘度とすればよいが、例えば、温度25℃おける粘度を1~100mPa・sとすることができる。この粘度は2~80mPa・sが好ましく、3~50mPa・sがより好ましい。
この界面活性剤(D)を用いる場合、その量は特に限定されないが、通常、前記重合体(B)の全量100質量部に対して0.01~0.5質量部であり、好ましくは0.02~0.1質量部である。
更に、酸転写樹脂膜形成用組成物を塗布した後、必要に応じて、プレベーク(PB)することによって塗膜中の溶剤を揮発させることで第2膜を形成してもよい。このプレベークの加熱条件は、酸転写樹脂膜形成用組成物の配合組成によって適宜選択されるが、加熱温度は、通常、30~150℃程度、好ましくは50~130℃である。更に、加熱時間は、通常、30~300秒間、好ましくは60~180秒間である。
また、第1膜(例えば、パターニング膜)上に形成された第2膜の厚みは特に限定されないが、通常、1~10000nmとすることが好ましく、5~800nmとすることがより好ましく、10~500nmとすることが更に好ましい。
露光工程(II)は、マスクを介して前記第2膜に露光し、前記第2膜に酸を発生させる工程である。これにより図1に例示するように、第2膜20の露光された部位が酸発生部位21となる。
露光に使用される放射線の種類は特に限定されず、前記第2膜に含まれる酸発生剤の種類に応じて、LEDランプ、紫外線(g線、i線等を含む)、遠紫外線(KrFエキシマレーザー、ArFエキシマレーザー、F2エキシマレーザー等を含む)、X線、電子線、γ線、分子線、イオンビーム等から適切に選択される。更に、露光量等も前記第2膜に含まれる酸発生剤の種類に応じて適宜選択される。
酸転写工程(III)は、前記第2膜に発生した前記酸を前記第1膜に転写する工程である。これにより図1に例示するように、前記酸発生部位21に対応した第1膜10の一部が酸転写部位11となる。
この酸を転写する方法は特に限定されないが、具体的には、(1)加熱により転写する方法、(2)常温において放置することによって転写する方法、(3)浸透圧を利用して転写する方法などが挙げられる。これらの方法は1種のみを用いてもよく2種以上を併用してもよいが、これらの中でも(1)加熱により転写する方法が転写効率に優れるため好ましい。
加熱により転写を行う場合の加熱条件は、特に限定されないが、加熱温度は、31~200℃が好ましく、70~150℃が更に好ましい。更に、加熱時間は、30~300秒間が好ましく、60~180秒間が更に好ましい。
また、加熱により転写を行う場合は、上記加熱条件により1回の加熱で完了してもよいが、結果的に上記加熱条件と同様の結果となるように、2回以上の加熱を行うこともできる。
尚、前記(2)常温において放置することによって転写する方法とは、加熱を行わず、通常、温度20~30℃の常温の環境に放置することで、第2膜内に発生された酸を自然に第1膜へと拡散させて転写する方法である。
第2膜除去工程(IV)は、前記第2膜を除去する工程である。即ち、第2膜を除去すると共に、その層下に酸が転写された第1膜(例えば、パターニング膜)を露出させる工程である。
前記除去はどのような方法で行ってもよいが、通常、第2膜を有機溶剤により溶解させて行う。この有機溶剤は、第2膜を溶解させるものの、酸が転写された第1膜は溶解させないものである。
アルカリ性溶液接触工程(V)は、前記第2膜除去工程の後に、前記第1膜をアルカリ性溶液と接触させる工程(例えば、アルカリ性現像液を用いて現像する工程)である。即ち、図1に例示するように、第1膜10内に形成された酸転写部位11を除去してパターン12を得る工程である。
アルカリ性溶液に含まれるアルカリ性化合物の濃度は特に限定されないが、0.1~5質量%が好ましく、0.3~3質量%が更に好ましい。
更に、前記アルカリ性溶液には、界面活性剤等を適量添加することもできる。
また、このアルカリ性溶液接触工程(V)以外の工程を備えなくてもよいが、他の工程を備えることもできる。他の工程としては、アルカリ性溶液接触工程の後に改質後の第1膜{即ち、例えば、パターニング膜(パターニング膜のうちの酸が転写された部位が除去された後、残存された部位)}を水洗する水洗工程等が挙げられる。
前記[1]改質方法において述べた酸転写樹脂膜形成用組成物の通りである。
即ち、本発明の酸転写樹脂膜形成用組成物は、(I)酸解離性基を有する第1膜上に、
感放射線性酸発生剤を含有する酸転写樹脂膜としての第2膜を形成する第2膜形成工程と、
(II)マスクを介して前記第2膜に露光し、該第2膜に酸を発生させる露光工程と、
(III)前記第2膜に発生した前記酸を前記第1膜に転写する酸転写工程と、
(IV)前記第2膜を除去する第2膜除去工程と、をこの順に備えた第1膜の改質方法に用いられる前記酸転写樹脂膜を形成するための酸転写樹脂膜形成用組成物であって、
(A)前記感放射線性酸発生剤と、(B)側鎖に含窒素基を有する重合体とを含有することを特徴とする。
更に、前記重合体(B)は、前記式(1)に示す構造単位を有することができる。加えて、前記重合体(B)は、前記式(2)に示す構造単位を有することができる。更に、前記感放射線性酸発生剤(A)は、前記重合体(B)100質量部に対して20~100質量部含むことができる。
各単量体のt-ブチルアクリレート20g、p-イソプロペニルフェノール30g、p-ヒドロキシフェニルメタクリルアミド20g、ヒドロキシエチルアクリレート20g、及びフェノキシポリエチレングリコールアクリレート10gと、プロピレングリコールモノメチルエーテルアセテート(溶媒)120gと、を混合して攪拌し、均一な溶液に調製した。その後、得られた溶液を30分間窒素ガスによりバブリングした。次いで、重合開始剤として2,2’-アゾビスイソブチロニトリル(AIBN)4g添加し、窒素ガスによるバブリングを継続しながら、反応温度を70℃に維持して3時間重合を行った。次いで、更にAIBN1gを添加して3時間反応した後、100℃で1時間反応させて、重合を終了した。その後、得られた反応溶液と多量のヘキサンと混合し、反応溶液内の生成物を凝固させた。次いで、凝固された生成物をテトラヒドロフランに再溶解した後、再度ヘキサンにより凝固させる操作を数回繰り返して未反応モノマーを除去し、減圧下50℃で乾燥して酸解離性基含有樹脂を得た。
得られた酸解離性基含有樹脂の収率は95%であり、Mwは15,000であり、Mw/Mnは2.5であった。
(1)Mw及びMn
東ソー(株)製GPCカラム(G2000HXL2本、G3000HXL1本、4000HXL1本)を用い、流量1.0ミリリットル/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するゲルパーミエーションクロマトグラフィ(GPC)により測定した。また、分散度Mw/Mnは測定結果より算出した。
(2)13C-NMR分析
各重合体の13C-NMR分析は、日本電子(株)製「JNM-EX270」を用い、測定溶媒としてCDCL3を使用して実施した。
(1)重合体(B)の合成
〔合成例1〕<重合体B1の合成>
本合成例1は、前記一般式(1)で表される構造単位を導入するための単量体(Bm1)として下記一般式(7)で表されるN,N-ジメチルアクリルアミドを用い、前記一般式(2)で表される構造単位を導入するための単量体(Bm2)としてメチルメタクリレートを用いた例である。
得られた重合体B1の収率は90%であり、Mwは11,000であり、Mw/Mnは2.3であった。重合体B1は前記式(1)に示す構造単位を有する樹脂である。
本合成例2は、前記合成例1におけるN,N-ジメチルアクリルアミド(単量体Bm1、株式会社興人製)を10g、メチルメタクリレート(単量体Bm2、三菱マテリアル株式会社製)90g、として前記合成例1と同様に行って重合体B2を得た。
得られた重合体B2のMwは10,000であった。重合体B2は前記式(1)に示す構造単位を有する樹脂である。
本合成例3は、前記合成例1におけるN,N-ジメチルアクリルアミド(単量体Bm1、株式会社興人製)を20g、メチルメタクリレート(単量体Bm2、三菱マテリアル株式会社製)80g、として前記合成例1と同様に行って重合体B3を得た。
得られた重合体B3のMwは9,000であった。重合体B3は前記式(1)に示す構造単位を有する樹脂である。
本合成例4は、前記合成例1におけるN,N-ジメチルアクリルアミドを、下記一般式(8)で表されるアクリロイルモルホリン(単量体Bm1、株式会社興人製)に換えて前記合成例1と同様に行って重合体B4を得た。
本合成例5は、前記合成例4におけるアクリロイルモルホリン(単量体Bm1、株式会社興人製)を10g、メチルメタクリレート(単量体Bm2、三菱マテリアル株式会社製)90g、として前記合成例4と同様に行って重合体B5を得た。
得られた重合体B5のMwは10,500であった。重合体B5は前記式(1)に示す構造単位を有する樹脂である。
本合成例6は、前記合成例4におけるアクリロイルモルホリン(単量体Bm1、株式会社興人製)を20g、メチルメタクリレート(単量体Bm2、三菱マテリアル株式会社製)80g、として前記合成例4と同様に行って重合体B6を得た。
得られた重合体B6のMwは10,000であった。重合体B6は前記式(1)に示す構造単位を有する樹脂である。
本合成例7は、単量体Bm1を用いず、メチルメタクリレート(単量体Bm2、三菱マテリアル株式会社製)100gを用いて前記合成例1と同様に行って重合体B7を得た。
得られた重合体B7のMwは15,000であった。重合体B7は前記式(1)に示す構造単位を有さない樹脂である。
本合成例8は、単量体Bm1を用いず、メチルメタクリレート(単量体Bm2、三菱マテリアル株式会社製)80gと、イソボニルアクリレート(大阪有機化学工業株式会社製)20gと、を用いて前記合成例1と同様に行って重合体B8を得た。
得られた重合体B8のMwは12,000であった。重合体B8は前記式(1)に示す構造単位を有さない樹脂である。
た。
4,7-ジ-n-ブトキシナフチルテトラヒドロチオフェニウムトリフルオロメタンスルホネート{酸発生剤(A)}3質量部、上記(1)で得られた重合体B1~B8の各重合体(B)100質量部、プロピレングリコールモノメチルエーテルアセテート{溶媒(C)}2000質量部、及び、NBX-15〔界面活性剤(D)、ネオス社製〕0.05質量部を混合し、攪拌により均一な溶液とした。この溶液を孔径0.5μmのカプセルフィルターでろ過して8種類の各酸転写樹脂膜形成用組成物(実験例1~13)を得た。
(1)パターニング樹脂膜形成工程
シリコン基板の表面にスピンコーターを用いて、前記[1]で得られたパターニング膜形成用組成物を塗布した。その後、ホットプレート上で110℃で1分間加熱して、厚さ200nmのパターニング膜(第1膜)を形成した。
前記(1)で得られたパターニング膜の表面にスピンコーターを用いて、前記[2]で得られた重合体B1~B8のいずれか1種を含む各酸転写膜形成用組成物を塗布した。その後、ホットプレート上で110℃で1分間加熱して、厚さ150nmの酸転写膜を形成した。
パターンマスクを介して、前記(2)で得られた酸転写膜の表面に、超高圧水銀灯(OSRAM社製、形式「HBO」、出力1,000W)を用いて100~1000mJ/cm2の紫外光を照射した。露光量は、照度計〔株式会社オーク製作所製、形式「UV-M10」(照度計)に、形式「プローブUV-35」(受光器)をつないだ装置〕により確認した。
前記(3)までに得られた積層体をホットプレート上にて、110℃で1分間加熱処理を行った。
前記(4)までに得られた積層体をアセトニトリルに30秒間浸漬して、酸転写樹脂膜のみを除去した。
前記(5)までに得られた積層体を、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室温で1分間浸漬して現像を行った。その後、流水洗浄し、窒素ブローを行ってパターンを得た。
尚、以下、このパターンが形成された基板を「パターニング基板」という。
前記パターニング基板を光学顕微鏡で観察し、感度評価を行った。ここで、感度とはライン/スペース=50/50μmのパターンが残渣なく解像する最小露光量を指し、その露光量を「最適露光量」とした。その結果を表3に示した。
Claims (11)
- (I)酸解離性基を有する第1膜上に、感放射線性酸発生剤を含有する酸転写樹脂膜としての第2膜を形成する第2膜形成工程と、
(II)マスクを介して前記第2膜に露光し、前記第2膜に酸を発生させる露光工程と、
(III)前記第2膜に発生した前記酸を前記第1膜に転写する酸転写工程と、
(IV)前記第2膜を除去する第2膜除去工程と、をこの順に備えることを特徴とする第1膜の改質方法。 - 前記第2膜除去工程の後に、(V)前記第1膜をアルカリ性溶液と接触させるアルカリ性溶液接触工程を備える請求項1に記載の第1膜の改質方法。
- 前記第2膜は、(A)前記感放射線性酸発生剤と、(B)側鎖に含窒素基を有する重合体とを含有する請求項1又は2に記載の第1膜の改質方法。
- 前記第2膜内において前記感放射線性酸発生剤(A)は、前記重合体(B)100質量部に対して20~100質量部含まれる請求項3乃至5のうちのいずれかに記載の第1膜の改質方法。
- 前記第1膜に対してパターンを付与するパターン形成方法である請求項1乃至6のうちのいずれかに記載の第1膜の改質方法。
- (I)酸解離性基を有する第1膜上に、
感放射線性酸発生剤を含有する酸転写樹脂膜としての第2膜を形成する第2膜形成工程と、
(II)マスクを介して前記第2膜に露光し、該第2膜に酸を発生させる露光工程と、
(III)前記第2膜に発生した前記酸を前記第1膜に転写する酸転写工程と、
(IV)前記第2膜を除去する第2膜除去工程と、をこの順に備えた第1膜の改質方法に用いられる前記酸転写樹脂膜を形成するための酸転写樹脂膜形成用組成物であって、
(A)前記感放射線性酸発生剤と、(B)側鎖に含窒素基を有する重合体とを含有することを特徴とする酸転写樹脂膜形成用組成物。 - 前記感放射線性酸発生剤(A)は、前記重合体(B)100質量部に対して20~100質量部含まれる請求項8乃至10のうちのいずれかに記載の酸転写樹脂膜形成用組成物。
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JP2012078828A (ja) * | 2010-10-04 | 2012-04-19 | Rohm & Haas Electronic Materials Llc | 下層組成物および下層を像形成する方法 |
CN104777712A (zh) * | 2010-10-04 | 2015-07-15 | 罗门哈斯电子材料有限公司 | 底层组合物和成像底层组合物的方法 |
JP2016173598A (ja) * | 2010-10-04 | 2016-09-29 | ローム アンド ハース エレクトロニック マテリアルズ エルエルシーRohm and Haas Electronic Materials LLC | 下層組成物および下層を像形成する方法 |
CN104777712B (zh) * | 2010-10-04 | 2019-10-18 | 罗门哈斯电子材料有限公司 | 底层组合物和成像底层组合物的方法 |
JP2015135492A (ja) * | 2013-12-31 | 2015-07-27 | ローム アンド ハース エレクトロニック マテリアルズ エルエルシーRohm and Haas Electronic Materials LLC | フォトレジストオーバーコート組成物 |
Also Published As
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JPWO2010007874A1 (ja) | 2012-01-05 |
KR20110044172A (ko) | 2011-04-28 |
KR101622797B1 (ko) | 2016-05-19 |
US20110076619A1 (en) | 2011-03-31 |
JP5459211B2 (ja) | 2014-04-02 |
US8252511B2 (en) | 2012-08-28 |
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