WO2005057287A1 - ポジ型レジスト組成物およびレジストパターン形成方法 - Google Patents
ポジ型レジスト組成物およびレジストパターン形成方法 Download PDFInfo
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- WO2005057287A1 WO2005057287A1 PCT/JP2004/018189 JP2004018189W WO2005057287A1 WO 2005057287 A1 WO2005057287 A1 WO 2005057287A1 JP 2004018189 W JP2004018189 W JP 2004018189W WO 2005057287 A1 WO2005057287 A1 WO 2005057287A1
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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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
Definitions
- the present invention relates to a positive resist composition and a method for forming a resist pattern.
- miniaturization has rapidly progressed due to advances in lithography technology.
- the wavelength of an exposure light source is generally shortened. Specifically, ultraviolet rays typified by g-line and i-line have been used in the past, but now a KrF excimer laser (248 nm) has been introduced.
- one of the resist materials that satisfies the conditions of high resolution that can reproduce fine dimensional patterns contains a base resin that increases alkali solubility by the action of acid and an acid generator that generates acid by exposure.
- a chemically amplified positive resist composition is known.
- the acid generator at present, oxam salt is most commonly used. Most of the aeon part (acid) of the oxam salt is a chain-like fluorinated alkylsulfonate ion, and other acids are rarely used because of the problem of acidity.
- the alkyl chain of the fluorinated alkyl is preferably a carbon atom having a long carbon number, and the alkyl chain has a carbon number of 4 or more.
- fluorinated alkyl sulfonic acids safety concerns have begun to be raised, and their use is now being restricted worldwide. Therefore, there is a need for an acid generator having a short diffusion length in a resist film without using such a long-chain fluorinated alkylsulfonic acid.
- LER line edge roughness
- the present inventors have already included a specific quaternary copolymer as a chemically amplified positive resist composition which is excellent in the resolution of an isolated line pattern and can suppress the proximity effect in a dense / dense mixed pattern.
- Proposal of a posi-type resist composition using, as a base resin, a resin component having a unit derived from a (meth) acrylic ester in the main chain and having an increased solubility in alkali due to the action of an acid See Patent Document 1).
- the positive resist composition containing the quaternary copolymer described in Patent Document 1 is excellent in the resolution of the isolated line pattern, the resolution of the L & S pattern and the trench pattern, that is, the resist
- the resolution of an isolated space pattern in which the ratio of the space portion size to the line portion size is less than 1, for example, the ratio of the space portion size to the resist line portion size is 1Z9 is not sufficient. Therefore, further improvement is required for the resolution of these patterns. Further, a positive resist composition containing the quaternary copolymer is required to further improve line edge roughness.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-167347
- the present invention has been made in view of the above circumstances, and is directed to a positive resist composition having excellent LER reduction and resolution, particularly excellent resolution of L & S patterns and isolated space patterns.
- An object of the present invention is to provide a method for forming a resist pattern using a distaste composition.
- the present invention has been made based on the above findings.
- the first aspect (aspect) of the present invention comprises (A) a resin component whose alkali solubility is increased by the action of an acid, and (B) an acid component by exposure to light.
- the resin component (A) includes a monocyclic or polycyclic group-containing acid dissociable, dissolution inhibiting group, a (meth) acrylate structural unit derived from acrylate ester (al), and a rataton-containing monocyclic or polycyclic ring.
- the positive resist composition wherein the acid generator component (B) contains at least one sulfo-dimethyl compound represented by the following general formula (b-1) or (b-2) It is.
- X represents an alkylene group having 2 to 6 carbon atoms in which at least one hydrogen atom has been replaced by a fluorine atom; ⁇ and ⁇ each independently represent at least one hydrogen atom having a fluorine atom Represents an alkyl group having 1 to 10 carbon atoms substituted with; R 1 — R 3 each independently represents an aryl group or an alkyl group, and at least one of R 1 — R 3 represents an aryl group .
- the second aspect of the present invention is that the positive resist composition is used on a substrate.
- a resist pattern forming method comprising: forming a resist film on a resist film; selectively performing exposure processing on the resist film; and developing the resist film with an alkali to form a resist pattern.
- the “rataton-containing monocyclic group or polycyclic group” is a monocyclic group composed of a rataton ring or a polycyclic group having a rataton ring.
- the rataton ring refers to one ring containing a CO—O structure, which is counted as the first ring. Therefore, here, a rataton-containing monocyclic group is used in the case of only a rataton ring, and a rataton-containing polycyclic group is used in the case of having another ring structure regardless of the structure.
- the “structural unit” means a monomer unit constituting the polymer.
- the “structural unit from which the (meth) acrylic acid ester power is also derived” refers to a unit represented by the following general formula (5), where R is a hydrogen atom.
- a constitutional unit derived from an ester a constitutional unit derived from a methacrylic acid ester which is an R-methyl group, and a lower alkyl group having about 2 to 5 carbon atoms in which R is a specific example, specifically, an ethyl group, It is a general term for structural units that are linear or branched alkyl groups such as propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group, pentyl group, isopentyl group, and neopentyl group.
- a resist pattern excellent in LER reduction and resolution, particularly in resolution of an L & S pattern and an isolated space pattern, can be formed.
- the positive resist composition of the present invention comprises a resin component (A) whose alkali solubility is increased by the action of an acid (hereinafter sometimes referred to as a component (A)), and an acid generator component which generates an acid upon exposure. (B) (hereinafter sometimes referred to as component (B)).
- the component (A) is a copolymer containing the structural unit (al)-(a4)
- the component (B) is a copolymer represented by the general formula (b-1) or (b-2). ), Characterized in that it contains at least one sulfonium compound.
- LER line edge roughness
- the component (A) is an alkali-insoluble component having a so-called acid dissociable, dissolution inhibiting group.
- an acid generated from the component (B) acts upon exposure to light, the acid dissociable, dissolution inhibiting group dissociates.
- the entire component (A) changes to alkali-insoluble caparum and alkali-soluble. Therefore, when exposure is performed through a mask pattern in the formation of a resist pattern, or when post-exposure bake (PEB) is performed in addition to exposure, the exposed part turns alkali-soluble, while the unexposed part remains alkali-insoluble. Since it does not change, a positive resist pattern can be formed by alkali development.
- PEB post-exposure bake
- the structural unit (al) is a unit derived from a (meth) acrylate ester containing a monocyclic or polycyclic group-containing acid dissociable, dissolution inhibiting group.
- Examples of the monocyclic group include groups obtained by removing one hydrogen atom from a cycloalkane, for example, an aliphatic monocyclic group such as a cyclopentyl group and a cyclohexyl group.
- Polycyclic groups include bicycloalkane, tricycloalkane, tetracycloalkane, etc., adamantane, Examples include groups in which one hydrogen atom has been removed from polycycloalkanes such as norbornane, isobornane, tricyclodecane, and tetracyclododecane, that is, aliphatic polycyclic groups.
- these monocyclic or polycyclic groups have been proposed for ArF resists.
- these monocyclic or polycyclic groups can be arbitrarily selected and used.
- use of an aliphatic polycyclic group such as an adamantyl group, a norbornyl group, or a tetracyclododele group is preferred in terms of industrial availability and the like.
- the acid dissociable, dissolution inhibiting group has an alkali dissolution inhibiting property that renders the entire component (A) alkali-insoluble before exposure, and is generated from the component (B) described below after exposure. It is dissociated by the action of an acid, and changes the entire component (A) to alkali-soluble.
- an acid dissociable, dissolution inhibiting group for example, those which form a cyclic or chain tertiary alkyl ester with a carboxyl group of (meth) acrylic acid are widely known.
- Any structural unit (al) may be used without particular limitation as long as it has the above-mentioned functions.
- at least one structural unit selected from the following general formulas (1), (2) and (3) is preferred in terms of excellent resolution and dry etching resistance.
- R is a hydrogen atom or a lower alkyl group, and R 1 is a lower alkyl group
- R is a hydrogen atom or a lower alkyl group, and R 2 and R 3 are each independently a lower alkyl group
- R is a hydrogen atom or a lower alkyl group, and R 4 is a tertiary alkyl group
- the carbon atom adjacent to the oxygen atom (1-O-1) in the ester portion of (meth) acrylic acid is the third unit on the ring skeleton such as an adamantyl group. This is the case when it becomes a lower alkyl group.
- R represents a hydrogen atom or a methyl group, and further a lower alkyl group having 2 to 5 carbon atoms, specifically, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, Lower linear or branched alkyl groups such as pentyl group, isopentyl group and neopentyl group are exemplified.
- R 1 is a lower linear or branched group such as a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, a pentyl group, an isopentyl group, and a neopentyl group.
- Alkyl group if R 1 is an alkyl group having 2 or more carbon atoms, acid dissociation tends to be higher than that of a methyl group, which is preferable. However, industrially, a methyl group or an ethyl group is most preferable.
- the carbon atom adjacent to the oxygen atom (1-O-1) in the ester portion of (meth) acrylic acid is a tertiary alkyl group.
- a ring skeleton such as an adamantyl group.
- R has the same definition as in the general formula (1), and R 2 and R 3 are each independently a lower alkyl group, that is, It is a C5 linear or branched alkyl group. Such groups tend to be more acid dissociable than the 2-methyl-2-adamantyl group. It is industrially preferable that both R 2 and R 3 be methyl groups.
- the carbon atom adjacent to the oxygen atom (-O-) in another ester part, which is different from the (meth) acrylate part is a tertiary alkyl group.
- R has the same definition as in the case of the general formula (1)
- R 4 is a tertiary alkyl group such as a tert-butyl group or a tert-amyl group. And preferably a tertiary alkyl group having 4 or 5 carbon atoms. It is industrially preferable that R 4 be a t tert-butyl group.
- the structural unit (a2) is a structural unit derived from ester (meth) acrylate containing a rataton-containing monocyclic or polycyclic group.
- the rataton functional group is effective for increasing the adhesion of the resist film formed from the composition of the present invention to the substrate and increasing the hydrophilicity with the developer.
- the structural unit (a2) is not particularly limited as long as it has such a radian functional group and a cyclic group. Anything can be used without being done.
- examples of the rataton-containing monocyclic group include groups in which the ⁇ -petit mouth rataton force also excludes one hydrogen atom
- examples of the rataton-containing polycyclic group include a bicycloalkane having a rataton group. , Tricycloalkane, and tetracycloalkane groups which exclude one hydrogen atom.
- a rataton-containing bicycloalkane having the formula (6) or a rataton-containing tricycloalkane having the structural formula (7) is advantageous in terms of industrial availability and the like, excluding one hydrogen atom.
- structural unit (a2) include structural units derived from a (meth) acrylate ester cap having a rataton-containing monocycloalkyl group or a tricycloalkyl group. Include structural units represented by the following general formulas (8) to (10).
- R is a hydrogen atom or a lower alkyl group
- R is a hydrogen atom or a lower alkyl group
- R is a hydrogen atom or a lower alkyl group
- the ⁇ -carbon has an ester bond in terms of excellent suppression and reduction of the proximity effect.
- a ⁇ -petit ratatone ester of (meth) acrylic acid represented by the general formula (10) that is, a structural unit derived from a (meth) acrylate ester of ⁇ -butyrolataton.
- the structural unit derived from norbornane ratatotone ester of (meth) acrylic acid represented by the general formulas (8) and (9), that is, the structural unit derived from the (meth) acrylic acid ester of norbornane ratatone is a resist pattern obtained.
- the shape, for example, the rectangularity is more favorable, so that it is preferable.
- the structural unit represented by the general formula (9) is preferable because its effect is extremely high.
- Structural unit (a3) is a structural unit derived from a (meth) acrylate ester containing a hydroxyl group-containing polycyclic group, and has a hydroxyl group which is a polar group, so that the resin component (A) It enhances the hydrophilicity of the whole developer and improves the alkali solubility of the exposed part, thereby contributing to the improvement of the resolution.
- the polycyclic group the same polycyclic group as in the case of the structural unit (al) can be used.
- the structural unit (a3) is not particularly limited as long as it is a hydroxyl group-containing polycyclic group, and any unit can be used. Specifically, a hydroxyl-containing adamantyl group, particularly a structural unit represented by the following general formula (4), is preferred in that it has an effect of increasing dry etching resistance and an effect of making a pattern cross section rectangular.
- R is a hydrogen atom or a lower alkyl group
- the structural unit (a4) is a structural unit derived from a (meth) acrylate ester cap having a polycyclic group-containing non-acid dissociable, dissolution inhibiting group other than the structural units (a2) and (a3).
- a structural unit derived from a (meth) acrylate ester containing a polycyclic group-containing non-acid dissociable, dissolution inhibiting group suppresses alkali solubility by increasing the hydrophobicity of the entire component (A) before and after exposure.
- a structural unit having a function That is, while reducing the alkali solubility of the entire component (A) before exposure, the acid dissociable, dissolution inhibiting group of the structural unit (al) is not dissociated by the action of an acid generated from the component (B) after exposure.
- the structural unit (a4) does not overlap with the structural unit (al), the structural unit (a2), and the structural unit (a3). That is, it does not hold any groups such as an acid dissociable, dissolution inhibiting group in the structural unit (al), a rataton group in the structural unit (a2), and a hydroxyl group in the structural unit (a3).
- the polycyclic group of the structural unit (a4) the same polycyclic group as in the case of the structural unit (al) can be used.
- a number of conventionally known ArF positive resist materials can be used.
- tricyclodecanyl (meth) acrylate, adamantyl (meth) acrylate Structural units derived from at least one member selected from the group consisting of methacrylate, tetracyclododetyl (meth) acrylate, and isovol (meth) acrylate It is preferable in that it is easy to perform.
- These exemplified constituent units are shown below as general formulas (11) and (14).
- the structural unit represented by the general formula (11) is preferable because the shape of the obtained resist pattern, for example, rectangularity is particularly good.
- R is a hydrogen atom or a lower alkyl group
- R is a hydrogen atom or a lower alkyl group
- R is a hydrogen atom or a lower alkyl group
- the component (A) particularly includes a structural unit represented by the general formula (1) as the structural unit (al) and a structural unit represented by the general formula (9) as the structural unit (a2).
- a copolymer comprising a structural unit represented by the general formula (11) as a structural unit (a4) and a structural unit represented by the general formula (4) as a structural unit (a3); That is, a copolymer containing the four types of structural units described in the following [Chemical formula 15] is preferable. This is because the rectangularity of the LER and the resist pattern is particularly excellent. Further, the dry etching resistance is preferably higher than that of a resin described later.
- a copolymer composed of the structural units (al)-(a4) is preferable because of its excellent effect.
- R is a hydrogen atom or a lower alkyl group
- R 5 is a methyl group or an ethyl group.
- the structural unit (al) is 25 50 mole 0/0, the range of preferably 30 to 40 mole 0/0
- the structural unit (a2) force 5- 50 mole 0/0, preferably in the range of 30- 40 mol%
- the structural unit (a3) is 10 30 mole 0/0, preferably 10-20 mole 0 / 0 in the range of the structural unit (a4) is 3-25 mole 0/0, and preferably from suitably in the range of 5-20 mol%.
- the obtained positive resist composition can greatly improve the depth of focus of the isolated pattern formed, and can sufficiently reduce the proximity effect by sufficiently suppressing the proximity effect. If the above range is largely deviated, a problem may occur when the resolution is reduced.
- a monomer that forms each of the structural units (al)-(a4) is added to a conventional chemically amplified positive resist.
- alkali such as acrylic acid derivatives, methacrylic acid derivatives, acrylic acid, methacrylic acid, maleic acid, fumaric acid, etc., which have a well-known dry etching resistance improving group or acid non-dissociable, dissolution inhibiting group.
- a known carboxylic acid having an ethylenic double bond, a known monomer used in the production of an acrylic resin, or the like is appropriately combined as needed and copolymerized.
- acrylic acid derivative for example, naphthyl acrylate, benzyl acrylate, atari Hydroxy group of carboxyl group, such as 3-lactic acid, oxocyclohexyl, ester of acrylic acid and terbineol, and ester of acrylic acid and 3-bromoacetone were protected by dry etching resistance improving group and acid non-dissociable substituent.
- Acrylic esters and the like can be mentioned.
- methacrylic acid derivative include methacrylic acid derivatives corresponding to these acrylic acid derivatives.
- Examples of the carboxylic acid having an ethylenic double bond include acrylic acid, methacrylic acid, maleic acid, and fumaric acid.
- acrylic resin examples include, for example, methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-hexyl acrylate Alkyl acrylates such as octyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, 2-hydroxyethyl acrylate and 2-hydroxypropyl acrylate, and the corresponding alkyl methacrylates. .
- the component (A) is a monomer for deriving each structural unit, for example, azobisisobuty-tolyl
- Polymerization can be obtained by known radical polymerization using a radical polymerization initiator such as (AIBN).
- a radical polymerization initiator such as (AIBN).
- the mass average molecular weight of component (A) is preferably 30,000 or less, more preferably 7,500 or less. It is more preferably 4000-7200, most preferably 5000-6500. When the weight average molecular weight is S7500 or less, LER is further improved. Also, development defects during alkali development are reduced.
- the degree of dispersion is preferably 1.0-5.0 force S, more preferably 1.0-3.0.
- the component (ii) can be composed of one or more resins.
- the copolymer having the structural unit (al)-(a4) as described above can be used alone. Two or more types may be mixed and used.
- the component (A) is a copolymer containing the structural unit (al)-(a4), the depth of focus of an isolated line pattern is improved, and the proximity effect is reduced. Also reduce As a result, a resist pattern faithful to the mask pattern is formed in both the coarse and dense patterns.
- the combination with the component (B) described later enhances the resolution of the L & S pattern and the isolated space pattern. Furthermore, the LER, shape and depth of focus of these patterns are improved.
- the component (B) is a sulfo-dum compound represented by the general formula (b-1) or (b-2) (hereinafter referred to as a sulfo-dum compound 1 or a sulfo-dum compound, respectively).
- Compound 2 a sulfo-dum compound represented by the general formula (b-1) or (b-2) (hereinafter referred to as a sulfo-dum compound 1 or a sulfo-dum compound, respectively).
- X is a linear or branched alkylene group in which at least one hydrogen atom has been replaced by a fluorine atom, and the number of carbon atoms of the alkylene group is Is 2-6, preferably 3-5, and most preferably 3 carbon atoms.
- ⁇ and ⁇ are each independently a linear or branched alkyl group in which at least one hydrogen atom is substituted by a fluorine atom, and the alkyl group has 1 to 10 carbon atoms, and is preferably It is 117, more preferably 113. It is preferable that the number of carbon atoms of the alkylene group of X or the number of carbon atoms of the alkyl group of ⁇ ⁇ ⁇ or ⁇ ⁇ ⁇ be smaller, since the solubility in the resist solvent is better.
- the alkylene group of X or the alkyl groups of ⁇ and ⁇ as the number of hydrogen atoms substituted with fluorine atoms increases, the strength of the acid increases, and high energy of 200 nm or less or electron beam Preferred because it increases the transparency to.
- the proportion of fluorine atoms in the alkylene group or alkyl group, that is, the fluorination rate, is preferably 70-100%, more preferably 90-100%, and most preferably all hydrogen atoms are fluorine atoms. Or a perfluoroalkylene group or a perfluoroalkyl group.
- R 1 - R 3 each independently represent a Ariru group or an alkyl group.
- At least one of R 1 to R 3 represents an aryl group.
- R 1 - of R 3, preferably be 2 or more is a Ariru group instrument
- R 1 - all R 3 is most preferably a Ariru group.
- the aryl group represented by R 1 to R 3 is not particularly limited.
- it is an aryl group having 6 to 20 carbon atoms, which may or may not be substituted with an alkyl group, a halogen atom or the like.
- a benzyl group and a naphthyl group are preferable because it can be synthesized at low cost.
- the alkyl group of R 1 to R 3 is not particularly limited, and examples thereof include a linear, branched or cyclic alkyl group having 11 to 10 carbon atoms. From the viewpoint of excellent resolution, it is preferable that the carbon number is 115. Specifically, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, n-pentyl, cyclopentyl, hexyl, cyclohexyl, nonyl, decanyl A methyl group is preferred because it has excellent resolution and can be synthesized at a low cost.
- R 1 — R 3 are all phenolic groups! / ,.
- These sulfo-dimethyl compounds 1 and 2 may be used alone or in combination of two or more.
- the component (B) provides a positive resist composition having excellent LER, resolution, resist pattern shape, depth of focus, and the like. It is necessary to include it.
- the proportion of at least one selected from the sulfo-pum compounds 1 and 2 is preferably 25 to 100% by mass of the entire component (B) as a total amount. 100% by mass is more preferred. When the content is 25% by mass or more, the effect of the present invention is sufficient.
- the component (B) may further contain a known acid generator conventionally used in a chemically amplified photoresist composition.
- Acid generators have been used in the past, such as rhododium salts and sulfonium salts, etc., oxime sulfonates, bisalkyl or bisarylsulfonyldiazomethanes, nitrobenzylsulfonates, Since various types such as iminosulfonates and disulfones are known, such known acid generators can be used without any particular limitation.
- a dimethyl salt containing a fluorinated alkylsulfonic acid ion as an ion (hereinafter referred to as an ionic salt-based acid generator) is preferable because the generated acid is strong.
- Examples of the cation of the strong acid salt-based acid generator include lower alkyl groups such as methyl group, ethyl group, propyl group, n-butyl group and tert-butyl group; methoxy group and ethoxy group. And substituted with a lower alkoxy group such as, for example, mono- or di-fluoronium, sodium di- or triphenylsulfonium; and dimethyl (4-hydroxynaphthyl) sulfonium.
- the strong acid salt-based acid generator has one or more hydrogen atoms in a linear alkyl group having 117, more preferably 113 carbon atoms. Fluoroalkylsulfonic acid ionic force substituted with an atom Power with high safety Preferred. When the carbon number is 7 or less, the strength as a sulfonic acid also increases. Further, the fluorination rate (the ratio of fluorine atoms in the alkyl group) of the fluorinated alkyl sulfonate ion is preferably 10 to 100%, more preferably 50 to 100%, and in particular, all hydrogen atoms are fluorinated. It is preferable because the strength of the acid is increased. Specific examples of such a substance include trifluoromethanesulfonate and heptafluoropropanesulfonate.
- foam salt-based acid generator examples include trifluoromethanesulfonate, nonafluorobutanesulfonate, and bis (4-tert-butylphenyl) odonium of diphenyl odonium.
- Trifluoromethanesulfonate or nonafluorobutanesulfonate trifluoromethanesulfonate of triphenylsulfonium, its heptafluoropropanesulfonate or its nonafluorobutanesulfonate, tri (4-methylphenyl) sulfonate- ⁇ Trifluoromethanesulfonate, heptafluoropropanesulfonate or nonafluorobutanesulfonate, dimethyl (4-hydroxynaphthyl) sulfo-dimethyl trifluoromethanesulfonate, heptafluoropropanesulfonate or No Nafluorobutanesulfonate, trifluorone methanesulfonate of monophenyldimethylsulfonate, its heptafluoropropanesulfonate or its nonafluorobutanesulfonate, trifluor
- These acid salt-based acid generators can be used alone or in combination of two or more.
- an acid salt-based acid generator is selected from sulfoxide compounds 1 and 2.
- the proportion of the acid salt-based acid generator is preferably from 10 to 75% by mass, more preferably from 30 to 70% by mass.
- the mixing ratio (mass ratio) of the oxamium salt-based acid generator and at least one selected from the sulfo-ammonium compounds 1 and 2 is 1: 9 to 9: 1, preferably 1: 5 to 5-5. : 1, most preferably 1: 2—2: 1.
- the component (B) is used in a proportion of 0.1 to 30 parts by mass, preferably 0.5 to 20 parts by mass, more preferably 1 to 10 parts by mass, per 100 parts by mass of the component (A). . If the amount is less than the lower limit, image formation is not performed. If the amount is more than 30 parts by mass, a uniform solution is obtained, and storage stability may be deteriorated.
- the positive resist composition of the present invention can be produced by dissolving the materials in an organic solvent (C) (hereinafter, referred to as component (C)).
- any one can be used as long as it can dissolve each component to be used to form a uniform solution. Two or more types can be appropriately selected and used.
- ketones such as ⁇ -butyrolatatone, acetone, methyl ethyl ketone, cyclohexanone, methyl isoamyl ketone, and 2-heptanone; ethylene glycol, ethylene glycol monomonoacetate, diethylene glycol, diethylene glycol monomonoacetate, Polyhydric alcohols such as propylene glycol, propylene glycol monoacetate, dipropylene glycol, dimethyl glycol monoacetate monomethyl ether, monoethyl ether, monopropyl ether, monobutyl ether or monophenyl ether, and derivatives thereof, and dioxane Cyclic ethers such as, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, butyl acetate, methyl pyruvate, ethyl pyruvate, methoxide Methyl propionate, and E ester such as ethoxye
- organic solvents may be used alone or as a mixed solvent of two or more.
- Propylene glycol monomethyl ether acetate The mixing ratio of PGMEA and the polar solvent may be appropriately determined in consideration of the compatibility of PGMEA with the polar solvent, but is preferably 1: 9 to 9: 1, more preferably 2: 8. — It is preferable to be within the range of 8: 2.
- the mass ratio of PGMEA: EL is preferably 2: 8-8: 2, and more preferably 3: 7-7: 3. preferable.
- the organic solvent a mixed solvent of at least one selected from the group consisting of PGMEA and EL and an organic solvent is also preferable. In this case, the mixing ratio of the former and the latter is preferably 70: 30-95: 5.
- the amount of the component (C) is not particularly limited, but is a concentration that can be applied to a substrate or the like and is appropriately set according to the coating film pressure.
- the solid content concentration of the resist composition is 2 to 2 0 mass%, preferably in the range of 5-15 mass%.
- the positive resist composition of the present invention further comprises an optional component in order to improve the resist pattern shape, post exposure stability of the latent image rormed by the pattern wise exposure of the resist layer, and the like.
- an optional component in order to improve the resist pattern shape, post exposure stability of the latent image rormed by the pattern wise exposure of the resist layer, and the like.
- a nitrogen-containing organic compound (D) hereinafter, referred to as a component (D)
- D nitrogen-containing organic compound
- lower aliphatic amine refers to an alkyl or alkyl alcohol amine having 5 or less carbon atoms.
- the secondary and tertiary amines include trimethylamine, getylamine, triethynoleamine, and diamine.
- Power especially tertiary alkanolamine such as triethanolamine is preferable .
- the component (D) is generally used in the range of 0.01 to 5.0 parts by mass based on 100 parts by mass of the component (A).
- Component (E) > Further, for the purpose of preventing the sensitivity deterioration due to the blending with the component (D) and improving the resist pattern shape, the stability over time, and the like, further, as an optional component, an organic carboxylic acid or oxo acid of phosphorus or phosphorus.
- the derivative (E) (hereinafter referred to as the component (E)) can be contained.
- the component (D) and the component (E) can be used in combination, or one of them is used.
- organic carboxylic acid for example, malonic acid, citric acid, malic acid, succinic acid, benzoic acid, salicylic acid and the like are suitable.
- Phosphorus oxo acids or derivatives thereof include phosphoric acid, derivatives such as phosphoric acid or di-n-butyl phosphate, diphenyl phosphate or the like, phosphonic acid, dimethyl phosphonate, and the like.
- Phosphonic acids such as di-n-butyl phosphonate, phenylphosphonic acid, diphenyl phosphonate, dibenzyl phosphonate and derivatives thereof such as esters, phosphines such as phosphinic acid and phenylphosphinic acid Derivatives such as acids and their esters are preferred, of which phosphonic acids are particularly preferred.
- the component (E) is used in an amount of 0.01 to 5.0 parts by mass per 100 parts by mass of the component (A).
- the positive resist composition of the present invention may further contain, if desired, additives that are miscible, for example, an additional resin for improving the performance of the resist film, a surfactant for improving coating properties, and dissolution inhibition.
- additives that are miscible for example, an additional resin for improving the performance of the resist film, a surfactant for improving coating properties, and dissolution inhibition.
- Agents, plasticizers, stabilizers, coloring agents, antihalation agents and the like can be added as needed.
- the method of forming a resist pattern according to the present invention can be performed, for example, as follows. That is, first, the positive resist composition is applied on a substrate such as silicon wafer with a spinner or the like, and PAB (pre-beta) is applied at a temperature of 80 to 150 ° C. for 40 to 120 seconds, preferably 60 to 150 seconds. — Apply for 90 seconds to form resist film. After selectively exposing ArF excimer laser light through a desired mask pattern using, for example, an ArF exposure apparatus, PEB (post-exposure baking) is applied for 40-120 seconds at a temperature of 80-150 ° C. Apply for 60-90 seconds, preferably. This is then added to an alkaline developer such as 0.1-10% by weight tetra Develop using an aqueous solution of methyl ammonium hydroxide. Thus, a resist pattern faithful to the mask pattern can be obtained.
- PAB pre-beta
- PEB post-exposure baking
- an organic or inorganic antireflection film can be provided between the substrate and the coating layer of the resist composition.
- the wavelength used for exposure is not particularly limited, and may be ArF excimer laser, KrF excimer laser, F excimer laser, EUV (extreme ultraviolet), VUV (vacuum ultraviolet), EB (electron
- the resist composition according to the present invention is particularly effective for an ArF excimer laser.
- Resin 1-2 having a weight average molecular weight of 6900 was obtained by the same composition and method as in Synthesis Example 1-1.
- Resin 2-2 having a weight average molecular weight of 6,400 was obtained by the same composition and method as in Synthesis Example 2-1.
- X in the above general formula (b-1) has 3 carbon atoms and all hydrogen atoms are A sulfonium compound in which an alkylene group substituted with a fluorine atom and R 1 to R 3 are a phenyl group ([Chemical Formula 19]; hereinafter, PAG1 and!
- an organic anti-reflective coating composition “ARC-29A” (trade name, manufactured by Pruy Science Co., Ltd.) was applied on a silicon wafer using a spinner and then heated to 215 ° C. on a hot plate. By baking for 60 seconds and drying, an organic antireflection film having a thickness of 77 nm was formed. Then, the above-mentioned positive resist composition is applied on an antireflection film using a spinner, pre-beta (PAB) at 120 ° C for 90 seconds on a hot plate, and dried to form a resist layer having a thickness of 250 nm. Was formed.
- PAB pre-beta
- PEB treatment was performed at 130 ° C for 90 seconds, followed by paddle development at 23 ° C with a 2.38% by weight aqueous solution of tetramethylammonium hydroxide for 60 seconds, followed by washing with water for 20 seconds and drying.
- the isolated resist pattern having a width of 80 nm formed had a round top shape, vertical resist line side walls, and a rectangular shape.
- 3 ⁇ which is a scale indicating the LER of the pattern formed above, was obtained.
- 3 ⁇ of the obtained pattern was 5.
- the value of 3 ⁇ is the standard deviation ( ⁇ ) of the standard deviation ( ⁇ ) calculated by measuring the resist pattern width of the sample at 32 locations using a side length SEM (trade name “S-9220” manufactured by Hitachi, Ltd.). Double value (3 ⁇ ). This 3 ⁇ means that the smaller the value, the smaller the roughness and the more uniform the width of the resist pattern.
- the depth of focus (DOF) was 450 nm.
- the line and space separation resolution was 240 nm pitch when the exposure was performed while gradually decreasing the pitch of the mask.
- a positive resist composition was prepared in the same manner as in Example 1 except that the type of the component (A) and the type and the amount (parts by mass) of the component (B) were changed as shown in Table 1.
- Example 9-112 and Comparative Example 3 the temperature of PAB in Example 1 was changed to 105 ° C, and the temperature of PEB was changed to 95 ° C.
- Example 13-18 and Comparative Examples 415 the temperature of PAB in Example 1 was changed to 125 ° C, and the temperature of PEB was changed to 115 ° C.
- PAG2 is a compound represented by the following [Chemical Formula 20]
- PAG3 is a compound represented by the following [Chemical Formula 21]
- PAG4 is a compound represented by the following [Chemical Formula 22]. is there.
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Materials For Photolithography (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003416584A JP2005173468A (ja) | 2003-12-15 | 2003-12-15 | ポジ型レジスト組成物およびレジストパターン形成方法 |
| JP2003-416584 | 2003-12-15 |
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| Publication Number | Publication Date |
|---|---|
| WO2005057287A1 true WO2005057287A1 (ja) | 2005-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2004/018189 Ceased WO2005057287A1 (ja) | 2003-12-15 | 2004-12-07 | ポジ型レジスト組成物およびレジストパターン形成方法 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2005173468A (ja) |
| TW (1) | TWI286670B (ja) |
| WO (1) | WO2005057287A1 (ja) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4448705B2 (ja) | 2004-02-05 | 2010-04-14 | 富士フイルム株式会社 | 感光性組成物及び該感光性組成物を用いたパターン形成方法 |
| JP2006078760A (ja) | 2004-09-09 | 2006-03-23 | Tokyo Ohka Kogyo Co Ltd | 電子線またはeuv(極端紫外光)用レジスト組成物及びレジストパターン形成方法 |
| US7960087B2 (en) | 2005-03-11 | 2011-06-14 | Fujifilm Corporation | Positive photosensitive composition and pattern-forming method using the same |
| JP4667278B2 (ja) * | 2005-03-11 | 2011-04-06 | 富士フイルム株式会社 | ポジ型感光性組成物及びそれを用いたパターン形成方法 |
| JP4677293B2 (ja) * | 2005-06-20 | 2011-04-27 | 富士フイルム株式会社 | ポジ型感光性組成物及び該ポジ型感光性組成物を用いたパターン形成方法 |
| JP5216892B2 (ja) * | 2005-07-26 | 2013-06-19 | 富士フイルム株式会社 | ポジ型レジスト組成物を用いたパターン形成方法 |
| JP4861767B2 (ja) | 2005-07-26 | 2012-01-25 | 富士フイルム株式会社 | ポジ型レジスト組成物およびそれを用いたパターン形成方法 |
| JP5100115B2 (ja) * | 2006-03-16 | 2012-12-19 | 東洋合成工業株式会社 | スルホニウム塩及び酸発生剤 |
| JP2008026838A (ja) * | 2006-06-23 | 2008-02-07 | Tokyo Ohka Kogyo Co Ltd | ポジ型レジスト組成物およびレジストパターン形成方法 |
| US8252503B2 (en) * | 2007-08-24 | 2012-08-28 | Az Electronic Materials Usa Corp. | Photoresist compositions |
| JP2011008293A (ja) * | 2010-09-15 | 2011-01-13 | Fujifilm Corp | ポジ型感光性組成物及び該ポジ型感光性組成物を用いたパターン形成方法 |
| JP6890454B2 (ja) * | 2017-03-31 | 2021-06-18 | 東京応化工業株式会社 | レジスト組成物及びレジストパターン形成方法、並びに、化合物及び酸拡散制御剤 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002223001A (ja) * | 2001-01-26 | 2002-08-09 | Nichia Chem Ind Ltd | 光電装置 |
| WO2003048863A1 (en) * | 2001-12-03 | 2003-06-12 | Tokyo Ohka Kogyo Co., Ltd. | Positive resist composition and method of forming resist pattern |
| JP2003171363A (ja) * | 2001-12-06 | 2003-06-20 | Sumitomo Chem Co Ltd | スルホニウム塩及びその用途 |
| JP2003223001A (ja) * | 2002-01-31 | 2003-08-08 | Fuji Photo Film Co Ltd | ポジ型レジスト組成物 |
| JP2003231673A (ja) * | 2001-12-03 | 2003-08-19 | Sumitomo Chem Co Ltd | スルホニウム塩及びその用途 |
| JP2003261529A (ja) * | 2001-12-27 | 2003-09-19 | Shin Etsu Chem Co Ltd | 光酸発生剤化合物、化学増幅ポジ型レジスト材料及びパターン形成方法 |
| JP2003287884A (ja) * | 2002-01-23 | 2003-10-10 | Sumitomo Chem Co Ltd | 化学増幅型ポジ型レジスト組成物 |
| JP2004012554A (ja) * | 2002-06-03 | 2004-01-15 | Jsr Corp | 感放射線性樹脂組成物 |
| JP2004026789A (ja) * | 2001-12-13 | 2004-01-29 | Sumitomo Chem Co Ltd | エネルギー活性なスルホニウム塩及びその用途 |
-
2003
- 2003-12-15 JP JP2003416584A patent/JP2005173468A/ja not_active Withdrawn
-
2004
- 2004-12-07 WO PCT/JP2004/018189 patent/WO2005057287A1/ja not_active Ceased
- 2004-12-09 TW TW93138146A patent/TWI286670B/zh not_active IP Right Cessation
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002223001A (ja) * | 2001-01-26 | 2002-08-09 | Nichia Chem Ind Ltd | 光電装置 |
| WO2003048863A1 (en) * | 2001-12-03 | 2003-06-12 | Tokyo Ohka Kogyo Co., Ltd. | Positive resist composition and method of forming resist pattern |
| JP2003231673A (ja) * | 2001-12-03 | 2003-08-19 | Sumitomo Chem Co Ltd | スルホニウム塩及びその用途 |
| JP2003171363A (ja) * | 2001-12-06 | 2003-06-20 | Sumitomo Chem Co Ltd | スルホニウム塩及びその用途 |
| JP2004026789A (ja) * | 2001-12-13 | 2004-01-29 | Sumitomo Chem Co Ltd | エネルギー活性なスルホニウム塩及びその用途 |
| JP2003261529A (ja) * | 2001-12-27 | 2003-09-19 | Shin Etsu Chem Co Ltd | 光酸発生剤化合物、化学増幅ポジ型レジスト材料及びパターン形成方法 |
| JP2003287884A (ja) * | 2002-01-23 | 2003-10-10 | Sumitomo Chem Co Ltd | 化学増幅型ポジ型レジスト組成物 |
| JP2003223001A (ja) * | 2002-01-31 | 2003-08-08 | Fuji Photo Film Co Ltd | ポジ型レジスト組成物 |
| JP2004012554A (ja) * | 2002-06-03 | 2004-01-15 | Jsr Corp | 感放射線性樹脂組成物 |
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| Publication number | Publication date |
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| JP2005173468A (ja) | 2005-06-30 |
| TWI286670B (en) | 2007-09-11 |
| TW200528923A (en) | 2005-09-01 |
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