WO2005052693A1 - ポジ型レジスト組成物及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及びレジストパターン形成方法 Download PDFInfo
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- WO2005052693A1 WO2005052693A1 PCT/JP2004/017405 JP2004017405W WO2005052693A1 WO 2005052693 A1 WO2005052693 A1 WO 2005052693A1 JP 2004017405 W JP2004017405 W JP 2004017405W WO 2005052693 A1 WO2005052693 A1 WO 2005052693A1
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- lower alkyl
- resist composition
- positive resist
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/281—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing only one oxygen, e.g. furfuryl (meth)acrylate or 2-methoxyethyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/283—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing one or more carboxylic moiety in the chain, e.g. acetoacetoxyethyl(meth)acrylate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/1053—Imaging affecting physical property or radiation sensitive material, or producing nonplanar or printing surface - process, composition, or product: radiation sensitive composition or product or process of making binder containing
- Y10S430/1055—Radiation sensitive composition or product or process of making
- Y10S430/106—Binder containing
- Y10S430/111—Polymer of unsaturated acid or ester
Definitions
- the present invention relates to a positive resist composition. More specifically, it relates to a positive resist composition suitable for the manufacture of electronic devices such as semiconductor devices and liquid crystal display devices, and more particularly to a chemically amplified type resist suitable for a process using an ArF excimer laser at a wavelength of 20 Onm or less. It relates to a positive resist composition.
- miniaturization has rapidly progressed due to advances in lithography technology.
- the wavelength of an exposure light source is generally shortened.
- ultraviolet rays typified by g-line and i-line were used, but now KrF excimer laser (248 nm) is the center of the light source used for mass production of electronic devices, and furthermore, ArF excimer laser (193 nm) has begun to be introduced as a light source used in mass production of electronic devices.
- a resist for a light source such as a KrF excimer laser or an ArF excimer laser is required to have high resolution capable of reproducing a pattern having a small dimension and high sensitivity to a light source having such a short wavelength.
- One of the resists that satisfies these conditions is a chemically amplified positive electrode containing a base resin whose alkali solubility is increased by the action of an acid and an acid generator (hereinafter, PAG t) that generates an acid upon exposure.
- PAG t acid generator
- the reaction mechanism of the chemically amplified positive resist is such that upon exposure, PG incorporated in the resist generates an acid, and the acid changes the solubility of the base resin.
- PG incorporated in the resist generates an acid
- the acid changes the solubility of the base resin.
- PEB post exposure baking
- the base resin component of chemically amplified resists has high transparency to KrF excimer laser (248 nm), and polyhydroxystyrene and its hydroxyl group protected by acid dissociable dissolution inhibiting group (hereinafter referred to as hydroxystyrene). (Sometimes referred to as resin).
- a resin having a benzene ring such as a hydroxystyrene resin
- a resin having a benzene ring has insufficient transparency at around 193 ⁇ m. Therefore, the chemically amplified resist using the resin as a base resin component has disadvantages such as low resolution.
- a resin having, in its main chain, a structural unit derived from a (meth) acrylate ester having a polycyclic hydrocarbon group such as an adamantane skeleton in an ester portion for example, see Patent Documents 118.
- Polycycloolefin type resin having a norbornane ring or the like in its main chain is a copolymer type resin (COMA) of a norbornane ring and maleic anhydride (for example, see Patent Documents 9 and 10) .
- Patent Document 1 Patent No. 2881969
- Patent Document 2 JP-A-5-346668
- Patent Document 3 JP-A-7-234511
- Patent Document 4 JP-A-9-73173
- Patent Document 5 JP-A-990637
- Patent Document 6 JP-A-10-161313
- Patent Document 7 JP-A-10-319595
- Patent Document 8 JP-A-11-12326
- Patent Document 9 JP-A-10-10739
- Patent Document 10 Japanese Patent Application Laid-Open No. 2000-235263
- Patent Document 11 Japanese Patent Application Laid-Open No. 2001-356483
- Patent Document 12 JP-A-2000-310859
- the present invention provides a chemically amplified positive resist composition having high sensitivity, high resolution, a uniform resist pattern size in a substrate surface, and a wide PEB margin.
- An object of the present invention is to provide a method for forming a resist pattern using a danigami amplification positive resist composition.
- the present inventors have conducted intensive studies and as a result, have a specific structural unit as a base resin component having an acid dissociable, dissolution inhibiting group and increasing alkali solubility by the action of an acid; And It has been found that the above problem can be solved by a positive resist composition using a copolymer having a specific range of Tg.
- the present inventors have proposed a resist pattern patterned at a specific range of PEB temperature determined from the relationship between the line and space space pattern size formed using a normal lithography process and the temporary PEB temperature at that time. It has been found that the above problem can be solved by the formation method.
- the present invention has been made based on the above findings.
- the first aspect (aspect) of the present invention is to have (A) an acid dissociable, dissolution inhibiting group and should increase alkali solubility by the action of an acid.
- a positive resist composition comprising one resin component, and (B) an acid generator component that generates an acid upon irradiation with radiation,
- the component (A) is a structural unit (a-1) which contains an acid dissociable, dissolution inhibiting group and is also derived from an ( ⁇ lower alkyl) acrylate ester having an aliphatic cyclic group, and (a-2) ) ( ⁇ - Lower alkyl) acrylate units containing ( ⁇ - lower alkyl) acrylate units containing ⁇ -petit mouth ratataton residues and (a-lower alkyl) acrylate esters containing (a-3) hydroxyl-containing aliphatic polycyclic hydrocarbon groups And a glass transition point (Tg) of the copolymer in the range of 100 to 170 ° C.
- Tg glass transition point
- a chemically amplified positive resist composition is applied on a substrate, a resist film is provided, the resist film is selectively exposed, and post-exposure baking (PEB) is performed.
- PEB post-exposure baking
- a method of forming a resist pattern by a lithography process of developing with an alkali In advance, each line and space pattern is formed at a plurality of temporary PEB temperatures by the lithography process, the size of the formed space pattern is taken on the vertical axis, and the relationship between the temporary PEB temperature at which the size is formed is taken on the horizontal axis.
- the tentative PEB temperature corresponding to the point where the size of the formed graph becomes the maximum is defined as the optimum PEB temperature, and the temperature within the range of the optimum PEB temperature ⁇ 2 ° C is used in the lithography process.
- This is a method for forming a resist pattern, which is performed at a PEB temperature.
- ( ⁇ -lower alkyl) acrylic acid ((a-lower alkyl) acrylate)” refers to ⁇ (lower alkyl) acrylic acid ( ⁇ ) such as methacrylic acid (methacrylate). -lower alkyl acrylate) and acrylic acid (acrylate).
- ⁇ -lower alkyl acrylate means a hydrogen atom bonded to the ⁇ -carbon atom of acrylic acid (acrylate) substituted with a lower alkyl group.
- structural unit means a monomer unit constituting the polymer.
- structural unit derived from (a lower alkyl) acrylate ester means a structural unit formed by cleaving the ethylenic double bond of (a lower alkyl) acrylate ester.
- ⁇ -petit mouth ratataton residue is a group in which one or more hydrogen atoms of the lactone ring have been removed from a ⁇ -butyrolataton force having a substituent or not having a substituent.
- the positive resist composition of the present invention has high sensitivity and high resolution, provides a uniform resist pattern size in a substrate surface, and has a wide margin. According to the method for forming a resist pattern of the present invention, similar effects can be obtained.
- FIG. 1 is a graph for obtaining an optimum temperature in Examples 6 and 7.
- the positive resist composition of the present invention comprises ( ⁇ ) a base resin component (hereinafter referred to as ( ⁇ ) component) having an acid dissociable, dissolution inhibiting group and having increased alkali solubility by the action of an acid; ) An acid generator that generates an acid upon irradiation with radiation (hereinafter, sometimes referred to as exposure) (hereinafter, referred to as component (II)).
- ⁇ component a base resin component having an acid dissociable, dissolution inhibiting group and having increased alkali solubility by the action of an acid
- An acid generator that generates an acid upon irradiation with radiation hereinafter, sometimes referred to as exposure
- a positive resist when an acid generated from the component ( ⁇ ) upon exposure acts on the component ( ⁇ ), the acid dissociable, dissolution inhibiting group in the component ( ⁇ ) is dissociated, and as a result, the entire positive resist is removed. Changes to alkali-soluble. Therefore, when the positive resist is exposed through a mask pattern in the formation of the resist pattern, or when the exposure is performed, the exposed part turns to alkali-soluble, while the unexposed part remains alkali-insoluble. Since it does not change, a positive resist pattern can be formed by alkali development. [0014] ⁇ Component (A)>
- the present invention provides a structural unit wherein the component (A) contains (a-1) an acid-dissociable, dissolution-inhibiting group and also contains an aliphatic cyclic group, and a (oc lower alkyl) acrylate ester is derived.
- a-2) (a lower alkyl) acrylate unit containing a ⁇ -petit ratataton residue and
- (a-3) (a-lower alkyl) acrylate unit containing a hydroxyl group-containing aliphatic polycyclic hydrocarbon group
- a copolymer comprising structural units derived from a force, wherein the copolymer has a glass transition point (Tg) in the range of 100 to 170 ° C.
- a component S is a copolymer having such structural units (a-1), (a-2) and (a-3);
- Tg glass transition point
- a conventional typical ArF resist has a 2-lower alkyl 2-adamantyl group such as a 2-methyl-2-adamantyl group or a 2-ethyl-2-adamantyl group as a unit containing an acid dissociable, dissolution inhibiting group ( a lower Although structural units derived from (alkyl) acrylate esters are used, the Tg change after removal of the acid dissociable, dissolution inhibiting group is large due to its structure. And promoted diffusion, and became highly heat-dependent and smaller than the PEB margin.
- the copolymer having the structural units (a-1), (a-2) and (a-3) as described above has a Tg of 100 ° C. or higher. Excellent in resolution and excellent in PEB margin because Tg is 170 ° C or less.
- a more preferred range of Tg is 115-170 ° C, and further preferably 130-165 ° C.
- the copolymer In order to have such a Tg, the copolymer must further have a weight average molecular weight (Mw; polystyrene conversion standard based on gel permeation chromatography) of about 2000 to 8000, preferably 5,000 to 8 , 000, more preferably 5,000- 7,000 U, which is preferred because it will be a resin with the appropriate Tg above.
- Mw weight average molecular weight
- the copolymer preferably has a dispersity of 2.5 or less, more preferably 1.7 or less, and even more preferably 1.6 or less.
- the acid dissociable, dissolution inhibiting group in component (A) has an alkali dissolution inhibiting property that renders the entire component (A) alkali insoluble before exposure, and at the same time, the acid generated from component (B) after exposure.
- alkali dissolution inhibiting property that renders the entire component (A) alkali insoluble before exposure, and at the same time, the acid generated from component (B) after exposure.
- Such acid dissociable, dissolution inhibiting groups can be used alone or in any combination of two or more of those used in (meth) acrylic acid-based resins and the like.
- Examples include an alkoxyalkyl group, a tertiary alkyloxycarbyl group, a tertiary alkyl group, a tertiary alkoxycarbalkyl group, and a cyclic ether group.
- Examples of the chain alkoxyalkyl group include a 1-ethoxyxyl group, a 1-methoxymethylethyl group, a 1-isopropoxyl group, a 1-methoxypropyl group, and a 1-n-butoxyethyl group.
- tertiary alkyloxycarbol group examples include a tert-butyloxycarbol group and a tert-amyloxycarbol group.
- tertiary alkyl group examples include a branched tertiary alkyl group such as a tert-butyl group and a tert-amyl group; and an aliphatic polycyclic group such as a 2-methyl-2-adamantyl group and a 2-ethyl-2-adamantyl group.
- Tertiary alkyl groups containing aliphatic monocyclic groups such as 1-methyl-1-cyclohexyl group and 1-ethyl-1-cyclohexyl group; tertiary alkoxycarbalkyl groups; Examples thereof include a tert-butyloxycarbomethyl group, a tert-amyloxycarbomethyl group and the like.
- Examples of the cyclic ether group include a tetrahydrovinyl group and a tetrahydrofuranyl group.
- Such an acid dissociable, dissolution inhibiting group is generally bonded to a side chain of a resin, specifically, bonded to an ester portion of a structural unit from which a carboxylic acid ester force is also induced.
- a carboxylic acid ester force is also induced.
- ( ⁇ lower alkyl) acrylate ester It is preferable to combine with the
- a tertiary alkyl group is preferred, and an aliphatic polycyclic group-containing tertiary alkyl group and an aliphatic monocyclic group-containing tertiary alkyl group are preferred.
- An aliphatic polycyclic group-containing tertiary alkyl group such as an aliphatic cyclic group-containing tertiary alkyl group (included in the structural unit (a-1) described below), is more preferred. preferable.
- the aliphatic polycyclic group-containing tertiary alkyl group includes an aliphatic polycyclic group in which the carbon atom bonded to the ester portion of the ( ⁇ -lower alkyl) acrylate forms a tertiary alkyl group.
- Group-containing tertiary alkyl groups are preferred.
- Examples of the aliphatic monocyclic group in the aliphatic monocyclic group-containing tertiary alkyl group include groups obtained by removing one hydrogen atom from cycloalkanes such as cyclopentane and cyclohexane.
- the aliphatic polycyclic group in the aliphatic polycyclic group-containing tertiary alkyl group can be arbitrarily selected from those proposed in a large number of ArF resists.
- groups such as adamantane, norbornane, isobornane, tricyclodecane, tetracyclododecane, and the like, in which one hydrogen atom has been removed from polycycloalkanes, such as bicycloalkane, tricycloalkane, and tetracycloalkane, may be mentioned.
- an adamantyl group, a norbornyl group, and a tetracyclodehydryl group are industrially preferable.
- the structural unit (a-1) is a structural unit that contains an acid dissociable, dissolution inhibiting group and also has an (a-lower alkyl) acrylate ester that contains an aliphatic cyclic group.
- Examples of such a structural unit (a-1) include (a-1-l): an acid dissociable, dissolution inhibiting group such as an aliphatic polycyclic group-containing tertiary alkyl group in the acid dissociable, dissolution inhibiting group described above.
- a structural unit having an aliphatic cyclic group-containing acid dissociable, dissolution inhibiting group such as an aliphatic cyclic group-containing tertiary alkyl group such as an aliphatic monocyclic group-containing tertiary alkyl group; — 12): Structural units in which the above-mentioned polycyclic group is bonded to the ester portion of the ( ⁇ -lower alkyl) acrylate and the acid dissociable, dissolution inhibiting group is bonded to the polycyclic group.
- the acid dissociable, dissolution inhibiting group may be different from the aliphatic polycyclic group, as in the structural unit (a-1-2), in which the dissociation inhibiting group may contain an aliphatic cyclic group. ,.
- the aliphatic cyclic group-containing tertiary alkyl group is more preferably an aliphatic polycyclic group-containing tertiary alkyl group, which is particularly preferred since it has excellent effects of the present invention.
- the structural unit (a-1) particularly contains a tertiary alkyl group as an acid dissociable, dissolution inhibiting group represented by the following general formula (I), (II) or (III). Those containing at least one member selected from the group consisting of structural units having an aliphatic polycyclic group and having excellent dry etching resistance and high resolution are preferable.
- R is a hydrogen atom or a lower alkyl group
- R 1 is a lower alkyl group
- R 2 and R 3 are each independently a lower alkyl group.
- R 4 is a tertiary alkynole group.
- the lower alkyl group for R may be a linear or branched alkyl group, preferably an alkyl group having 15 to 15 carbon atoms, and more preferably a methyl group.
- a straight-chain or branched alkyl group preferably an alkyl group having 11 to 15 carbon atoms, more preferably a methyl group or ethyl group having 11 to 12 carbon atoms are mentioned.
- tertiary alkyl group for R 4 examples include a branched tertiary alkyl group having 4 or 5 carbon atoms such as a tert-butyl group and a tert-amyl group.
- a structural unit derived from an (OC lower alkyl) acrylate ester is preferred, because Tg in a suitable range can be obtained and a resist pattern having an excellent PEB margin can be obtained.
- 1-ethyl-1-cyclohexyl lower alkyl) acrylate and 1-methyl-1-cyclohexyl (a lower alkyl) acrylate 1-ethyl-1-cyclopentyl (lower alkyl) acrylate and 1 -Methyl-1 cyclopentyl ( a -lower alkyl) acrylate is also preferably used.
- the component (A) further comprises, in addition to the structural unit (a-1), a structural unit (a—) derived from an (ex lower alkyl) acrylate ester containing a ⁇ -petit mouth ratataton residue. 2).
- a structural unit (a—) derived from an (ex lower alkyl) acrylate ester containing a ⁇ -petit mouth ratataton residue. 2
- R 5 is each independently a hydrogen atom or a lower alkyl group, and m is an integer of 1 to 4.
- a linear preferably an alkyl group having 115, more preferably 113, carbon atoms.
- R 5 is most preferably a hydrogen atom.
- the structural unit represented by the following general formula (V) is most preferable because it has excellent substrate adhesion, resolution, and low margin.
- the component (A) contains a hydroxyl-containing aliphatic polycyclic hydrocarbon group (a-lower alkyl) in addition to the structural unit (a-1) and the structural unit (a-2).
- the acrylate ester has a structural unit (a-3) from which the force is also derived.
- aliphatic polycyclic group in the structural unit (a-3) a large number of polycyclic groups similar to those exemplified in the structural unit (a-1) can be appropriately selected and used.
- the ratio of the structural units, the structural unit (a- 1) is 20-60 mole 0/0, preferably 30- 5 0 mole 0/0 to range of excellent resolution preferred.
- Structural units force 0- 60 mole 0/0, preferably superior to one the resolution of the range of 20- 50 mole 0/0 preferred.
- the resin of the component (A) of the present invention includes, among others, a structural unit represented by the general formula (I) as (a-1), and among them, a 2-methyladamantyl group, and (a-2) As a structural unit represented by the general formula (V), and (a-3) represented by the general formula (VI), wherein n is 1 and a hydroxyl group is bonded to the 3-position of the adamantyl group, Combinations are preferred.
- (C) A copolymer of an acrylate ester and a methacrylate ester unit composed of the structural unit (aa) and the structural unit (ma).
- the resin of the component (A) of the present invention has a Tg that varies depending on the ratio of the structural unit (aa) to the structural unit (ma).
- structural unit (a-1) a structural unit represented by the general formula (I), and a structural unit (a-1-m) which is an R-methyl group,
- the structural unit (a-3) is represented by the general formula (VI), wherein n is 1, a hydroxyl group is bonded to the 3-position of the adamantyl group, and the R force S methyl A copolymer having a combination of structural units (a-3 m) as a group, wherein the Tg is 150-165 ° C.
- the component (A) falls within a specific Tg range, and as the structural unit (a-4), as long as the effect of the present invention is not impaired, as the structural unit (a-1), (a-2), Other than (a-3), it may contain a constitutional unit derived from an (OC lower alkyl) acrylate ester containing an aliphatic polycyclic group or other known units !.
- Examples of the aliphatic polycyclic group include a large number of aliphatic polycyclic groups similar to those in the structural units (a-1), (a-2), and (a-3).
- a-4 Many such structural units (a-4) have been known as ArF positive resist materials.
- tricyclodecal (meth) acrylate, adamantyl (meth) acrylate, tetracyclode -Mole (meth) acrylate or isovol (Meth) acrylate The at least one force selected is preferred because the derived unit is industrially easily available. Further, these constituent units are acid non-dissociable groups.
- each unit in the case of a 4-way system structural units (a- 1) is 25 50 mol%, favorable Mashiku is in the range of 30- 40 mole 0/0, the structural unit (a- 2) force 5- 50 mole 0/0, preferably in the range of 30- 40 mole 0/0, the structural units (a- 3) is 10- 30 mol 0/0, preferably 10- 2 0 in the range of mole 0/0, the structural units (a- 4) is 5 25 mole 0/0, so preferably the case in the range of 10 20 mol 0/0, to improve the depth of focus of an isolated pattern This is preferable because the proximity effect can be reduced. If the value is outside this range, there is a problem that the resolution deteriorates, which is not preferable.
- component (A) can be synthesized by a known radical polymerization method.
- any one can be appropriately selected from those conventionally known as acid generators in chemically amplified resists.
- oxo salts in which a fluorinated alkylsulfonic acid ion is used as an aion are preferred.
- preferred acid generators include di-fluoro dimethyl trifluoromethanesulfonate, (4-methoxyphenyl) phenyl trifluoromethyl methane sulfonate, and bis (p-tert-butyl phenol).
- Eodo-trifluoromethanesulfonate triphenyl sulfo-dimethyltrifluoromethanesulfonate, (4-methoxyphenyl) diphenylsulfo-dimethyltrifluoromethanesulfonate, (4-methylphenyl) diphenylsulfonic sulfonamide Fluorobutane sulfonate, (p-tert-butylphenyl) diphenylsulfo-dimethyltrifluoromethanesulfonate, diphenyl-nonamfluorofluorobutanesulfonate, bis (p-tert-butylbutylphenyl) yl Donunumonafluorobutane sulfonate, Triphenylsulfo-dimethylnonafluorobuta Sulfonate, (4 trifluorofluoromethyl) diphenylsulfo-dimethyltri
- one type of acid generator may be used alone, or two or more types may be used in combination.
- the amount of the component (B) used is 0.5-30 parts by mass, preferably 110 parts by mass, per 100 parts by mass of the component (A). If the amount is less than 0.5 part by mass, pattern formation may not be sufficiently performed, and if the amount exceeds 30 parts by mass, a uniform solution may be obtained and storage stability may be deteriorated.
- Organic solvent (C)> The positive resist composition of the present invention can be produced by dissolving the materials in an organic solvent (C).
- any one can be used as long as it can dissolve each component to be used to form a uniform solution.
- One or more types can be appropriately selected and used.
- ratatones such as ⁇ -butyrolataton, ketones such as acetone, methylethyl ketone, cyclohexanone, methyl isoamyl ketone, and 2-heptanone
- ethylene glycol ethylene glycolone monoacetate, diethylene glycol, diethylene glycolone monoacetate
- Polyhydric alcohols such as propylene glycol, propylene glycol monoacetate, dipropylene glycol or dipropylene glycol monoacetate, such as monomethyl ether, monoethynoleatenole, monopropinoleatene, monobutynoleatene or monophenylenoleate, and polyhydric alcohols thereof.
- cyclic ethers such as dioxane, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, butyl acetate, methyl pyruvate, pill Esters such as ethyl ethyl borate, methyl methoxypropionate and ethyl ethoxypropionate can be mentioned.
- organic solvents may be used alone or as a mixture of two or more solvents.
- the mixing ratio thereof may be appropriately determined in consideration of the compatibility of PGMEA with the polar solvent, but is preferably The ratio is preferably in the range of 1: 9 to 9: 1, more preferably 2: 8 to 8: 2! /.
- the mass ratio of PGMEA: ⁇ L is preferably 2: 8-8: 2, more preferably 3: 7-7: 3. Is preferred.
- a mixed solvent of at least one selected from the group consisting of PGMEA and EL and a polybutyrate 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. It is within the range of 20% by mass, preferably 5 to 15% by mass. ⁇ Nitrogen-containing organic compound (D)>
- the positive resist composition of the present invention may further contain a nitrogen-containing organic compound as an optional component (D) in order to improve the resist pattern shape, the stability with time of leaving, and the like.
- any known one may be used arbitrarily, but a secondary lower aliphatic amine ⁇ tertiary lower aliphatic amine is preferred.
- 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.
- Grade alkanolamines are preferred.
- components (D) are generally used in the range of 0.01 to 5.0 parts by mass based on 100 parts by mass of the component (A).
- an organic carboxylic acid or an oxo acid of phosphorus or a derivative thereof may be further contained as an optional component (E).
- the components (D) and (E) can be used in combination, or any one of them can be used.
- organic carboxylic acids include malonic acid, cunic acid, malic acid, succinic acid, and benzoic acid. Acids and salicylic acids are preferred.
- Phosphorus oxoacids or derivatives thereof include phosphoric acid such as phosphoric acid, di-n-butyl phosphate, diphenyl phosphate, and derivatives such as esters thereof, phosphonic acid, dimethyl phosphonate, and phosphonic acid.
- Phosphones such as acid-di-n-butyl ester, phenol phosphonic acid, phosphonic acid diphenyl ester, phosphonic acid dibenzyl ester, etc.
- Derivatives such as acids and their esters, and phosphinic acids such as phosphinic acid and polyphosphinic acid and their derivatives such as esters are preferred. Of these, phosphonic acid is 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, dyes, and the like can be appropriately added and contained.
- the above-described positive resist composition of the present invention has high sensitivity and high resolution, can obtain a uniform resist pattern size in the substrate surface, and has a wide PEB margin.
- a resist pattern forming method is to apply a chemically amplified positive resist composition on a substrate, provide a resist film, and selectively expose the resist film,
- a resist pattern formation method by a lithography process of heating after exposure (PEB) and developing with alkali
- PEB heating after exposure
- an optimum PEB temperature determined in advance is applied. That is, in the method of forming a resist pattern according to the present invention, each line and space pattern is formed in advance at the plurality of temporary PEB temperatures by the lithography process, and the size of the formed space pattern is set on the vertical axis, and the size is formed.
- the temporary PEB temperature corresponding to the point where the size becomes the maximum in the graph formed is defined as the optimal PEB temperature, and the optimal PEB temperature is calculated.
- the temperature in the range of ° C is set as the PEB temperature in the lithography process.
- the lithography process for obtaining the optimum PEB temperature is a normal process, and can be more specifically performed, for example, as follows.
- a chemically amplified positive resist composition is applied on a substrate such as silicon wafer by a spinner or the like, and a pre-beta is applied at a temperature of 80 to 150 ° C. for 40 to 120 seconds, preferably 60 to 90 seconds. Apply.
- the obtained film is selectively exposed to ArF excimer laser light through a desired mask pattern using, for example, an ArF exposure apparatus, and then exposed to light.
- PEB post-exposure bake
- this is developed using an alkali developer, for example, an aqueous solution of 0.1 to 10% by mass of tetramethylammonium hydroxide.
- an alkali developer for example, an aqueous solution of 0.1 to 10% by mass of tetramethylammonium hydroxide.
- an organic or inorganic antireflection film can be provided between the substrate and the coating layer of the resist composition.
- the wavelength used for the exposure is not particularly limited.
- the resist composition according to the present invention is effective for ArF excimer laser.
- selective exposure also includes drawing using an electron beam.
- the heating temperature (temporary PEB temperature) at the time of performing PEB is changed, and the line and space pattern is formed under each temporary PEB temperature condition. Form. Then, the space pattern size of the formed line and space is plotted on the vertical axis, and the tentative PEB temperature when the space pattern size is formed is plotted on the horizontal axis, whereby a mountain-shaped graph is created. At this time, it is preferable that conditions other than the temporary PEB temperature in the lithography process be constant.
- the space pattern size becomes maximum, and as the temperature deviates from the optimum PEB temperature, the space pattern size decreases.
- the cause is not clear, but at a PEB temperature lower than the optimum PEB temperature, the lower the PEB temperature, the less the diffusion of the acid that also produced the (B) component force in the resist, the smaller the size,
- a PEB temperature higher than the optimum PEB temperature it is considered that the higher the PEB temperature, the smaller the size of the resist, which has been softened by heat, being transferred to the space portion.
- the filter conditions are preferably the same as those for obtaining the optimum PEB temperature.
- the optimum PEB temperature can be determined as follows.
- the PEB temperature (temporary PEB temperature) is changed, and other lithography conditions are kept constant, and a line and space is formed using a normal lithography process.
- the line and space are arbitrary. Normally, since the numerical aperture NA of the lens of the exposure apparatus is 0.6 to 0.9, the line and space are about 80 nm to 130 nm.
- the process is performed with a line and space of 120 nm.
- a graph is created by plotting the space pattern size of the formed line and space under each PEB temperature condition on the vertical axis, and plotting the temporary PEB temperature when the space pattern size is formed on the horizontal axis. (refer graph1).
- the tentative PEB temperature corresponding to the vertex of the graph to be formed that is, the point at which the size of the space pattern is maximized is set as the optimum PEB temperature.
- a temperature within the range of the optimum PEB temperature ⁇ 2 ° C., preferably ⁇ 1 ° C. is set as a PEB temperature in a lithography process for actually obtaining a resist pattern.
- the optimum PEB temperature is ⁇ 2 ° C
- the PEB margin is 4.OnmZ ° C or less, preferably 3.5 nmZ ° C or less. !, So much better! / ,.
- the “temporary PEB temperature” is the PEB temperature for obtaining such a graph.
- the positive resist composition of the first aspect is preferably used.
- the PEB margin is further widened, and a resist pattern having high sensitivity, high resolution, and high in-plane uniformity can be formed.
- a positive resist composition was prepared by dissolving 25 parts by mass of butyrolataton and 900 parts by mass of a mixture of propylene glycol monomethyl ether acetate and ethyl lactate (weight ratio of 8: 2).
- 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 positive resist composition is applied on the organic antireflection film using a spinner, pre-beta at 125 ° C for 90 seconds on a hot plate, and dried to form a resist layer having a thickness of 250 nm. Formed.
- the resolution of the trench pattern when exposing at a dose of 23 mjZcm 2 at which the 130-nm mask obtained by using the positive resist composition of this example was transferred to 130 nm was 133 nm. There was a good shape.
- the maximum and minimum size of each resist pattern formed on the wafer When the difference was determined, it was very small, 2-3 nm, and the in-plane uniformity was high.
- the PEB margin of the trench pattern change the PEB temperature to 125 ° C, 130 ° C, and 135 ° C, obtain the resist pattern size formed at each temperature, and calculate the amount of change in the resist pattern size per unit temperature. As a result, it was as small as 1.6 nmZ ° C, which was preferable.
- a positive resist composition having the same composition as in Example 1 except that the copolymer was changed to 100 parts by mass of the copolymer having the same structural formula, a weight average molecular weight of 7,800, a dispersity of 1.98, and a Tgl of 60 ° C. was prepared.
- Example 2 the patterning evaluation was performed in the same manner as in Example 1. As a result, at a light exposure of 23 mjZcm 2 at which a 130-nm mask obtained by using the positive resist composition of this example was transferred to 130 nm. The resolving power of the trench pattern when exposed is 13 lnm, and the shape is good.
- the difference between the maximum size and the minimum size of each resist pattern formed on the wafer was determined to be 2-3 nm, which was very small and high in-plane uniformity, and was satisfactory.
- the PEB temperature was changed to 130 ° C and 135 ° C as the PEB margin of the trench pattern, the resist pattern size formed at each temperature was determined, and the amount of change in the resist pattern size per unit temperature was determined. It was as small as 9 nmZ ° C, which was preferable.
- Example 2 the patterning evaluation was performed in the same manner as in Example 1.
- the resolving power of the trench pattern when exposed is 137 nm, and the shape is good.
- the difference between the maximum size and the minimum size of each resist pattern formed on the wafer was determined to be 2-3 nm, which was very small and high in-plane uniformity, and was satisfactory.
- the PEB margin of the trench pattern change the PEB temperature to 125 ° C, 130 ° C, and 135 ° C, obtain the resist pattern size formed at each temperature, and calculate the amount of change in the resist pattern size per unit temperature. As a result, it was as small as 2.3 nmZ ° C, which was preferable.
- Example 2 the patterning evaluation was performed in the same manner as in Example 1.
- a light exposure of 2 2 mjZcm 2 at which a 130 nm mask obtained by using the positive resist composition of this example was transferred to 130 nm.
- the resolving power of the trench pattern when exposed is 130 nm, and it has good shape.
- the difference between the maximum size and the minimum size of each resist pattern formed on the wafer was determined to be 2-3 nm, which was very small and high in-plane uniformity, and was satisfactory.
- the PEB temperature was changed to 125 ° C, 130 ° C, and 135 ° C, the resist pattern size formed at each temperature was determined, and the amount of change in the resist pattern size per unit temperature was calculated. As a result, it was as small as 3 lnmZ ° C, which was preferable.
- Example 2 the patterning evaluation was performed in the same manner as in Example 1.
- the exposure dose at which the 130-nm mask obtained by using the positive resist composition of this example was transferred to 130 nm was used.
- the resolving power of the trench pattern when exposed at 2 mjZcm 2 is 136 nm, which is a good shape.
- the difference between the maximum size and the minimum size of each resist pattern formed on the wafer was determined to be 2-3 nm, which was very small and high in-plane uniformity, and was satisfactory.
- the PEB temperature was changed to 130 ° C and 135 ° C as the PEB margin of the trench pattern, the resist pattern size formed at each temperature was obtained, and the amount of change in the resist pattern size per unit temperature was obtained. It was as small as 5 nmZ ° C and preferred.
- Positive resist set having the same composition as in Example 1, except that the copolymer was changed to the same structural formula with a mass average molecular weight of 10,200, a dispersity of 2.29, and a copolymer of Tgl72 ° C of 100 parts by mass.
- a composition was prepared.
- Example 2 the patterning evaluation was performed in the same manner as in Example 1.
- the resolving power of the trench pattern upon exposure was 127 nm, which was a good shape.
- the size of each resist pattern formed on the wafer varied widely, and the in-plane uniformity was bad.
- the PEB temperature was changed to 130 ° C and 135 ° C as the PEB margin of the trench pattern, the size of the resist pattern formed at each temperature was determined, and the amount of change in the resist pattern size per unit temperature was calculated. OnmZ ° C was bad.
- Positive resist set having the same composition as in Example 1 except that the copolymer was changed to the same structural formula and the mass average molecular weight was 11,100, the dispersity was 2.42, and the copolymer was 100 parts by mass of Tgl79 ° C.
- a composition was prepared.
- Example 2 the patterning evaluation was performed in the same manner as in Example 1. As a result, at a light exposure of 23 mjZcm 2 at which a 130-nm mask obtained by using the positive resist composition of this example was transferred to 130 nm. The resolution of the trench pattern upon exposure was 126 nm, which was a good shape, but the size of each resist pattern formed on the wafer varied. A lot of in-plane uniformity was bad.
- the PEB temperature was changed to 130 ° C and 135 ° C as the PEB margin of the trench pattern. lnmZ ° C, which was poor.
- Example 2 the patterning evaluation was performed in the same manner as in Example 1.
- the resolving power of the trench pattern upon exposure was 130 nm, which was a good shape.
- the size of each resist pattern formed on the wafer varied widely, and the in-plane uniformity was bad.
- the PEB temperature was changed to 130 ° C and 135 ° C as the PEB margin of the trench pattern. It was 2 nmZ ° C, which was bad.
- Example 3 and Example 5 Using the positive resist compositions used in Example 3 and Example 5, the pattern formed in Example 3 and Example 5 was changed from a trench pattern to a 120 nm line and space pattern. And the PEB temperature (temporary PEB temperature) was changed to 125-140 ° C, and the exposure dose at which the 120 nm mask obtained using the positive resist composition of this example was transferred to 120 nm was changed. A resist pattern was formed in the same manner except for exposing. Next, the temporary PEB temperature was plotted on the horizontal axis, and the space size of the line-and-space pattern formed by each temporary PEB temperature was plotted on the vertical axis, and two types of mountain-shaped graphs were obtained (see Fig. 1). In FIG. 1, the graph of S1 corresponds to the example using the positive resist composition of Example 5 (Example 7), and the graph of S2 represents the example of using the positive resist composition of Example 3 (Example 7). This corresponds to Example 6).
- the PEB temperature (optimal PEB temperature) corresponding to the top of these graph forces is Sl, S2, and so on. It was found to be about 131 ° C and about 132 ° C, respectively.
- Example 5 The exposure amount obtained in Example 5 was 22 mjZcm 2 , and the space size of the line and space pattern at that time was 120 nm, which was a good shape.
- the in-plane uniformity was as small as 2-3 nm, which was satisfactory.
- the change in the resist pattern size was calculated by dividing the space size corresponding to the temperature ⁇ 1 ° C by 2 ° C, which was 1.4 nmZ ° C and 3.3 nmZ ° C, respectively, which were small and preferred. there were.
- the PEB margins at 128 ° C and 134 ° C were determined in the same manner, they were 6.9 nmZ ° C and 5.6 nmZ ° C, respectively, which were large and poor (Comparative Example 4).
- Example 3 Using the positive resist composition of Example 3, a line and space turn was formed at a PEB temperature of 130 ° C. in the same manner as described above.
- the exposure dose to be transferred obtained in Example 3 was 22 miZcm 2 , and the space size of the line-and-space pattern at that time was 127 nm, which was a good shape. Also, when the difference between the maximum size and the minimum size of each resist pattern formed on the wafer was determined, the very small in-plane uniformity of 2-3 nm was satisfactory.
- the PEB temperature was changed to 128 ° C, 130 ° C, 132 ° C, and 134 ° C, and at 132 ° C ⁇ 2 at 130 ° C and 134 ° C.
- the amount of change in resist pattern size per unit temperature was calculated by dividing the space size corresponding to that temperature ⁇ 1 ° C by 2 ° C, which was as small as 3.5 nmZ ° C and 3.1 nmZ ° C, respectively. It was a good thing.
- the PEB margins of 129 ° C and 135 ° C were determined in the same manner, they were 5.7 nmZ ° C and 4.6 nmZ ° C, respectively, which were large and defective (Comparative Example 5).
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Abstract
Description
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US10/580,768 US20070105038A1 (en) | 2003-11-28 | 2004-11-24 | Positive resist composition and method for forming resist pattern |
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JP2003399663A JP2005164633A (ja) | 2003-11-28 | 2003-11-28 | ポジ型レジスト組成物及びレジストパターン形成方法 |
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JP (1) | JP2005164633A (ja) |
KR (1) | KR20060133978A (ja) |
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JP4279237B2 (ja) * | 2004-05-28 | 2009-06-17 | 東京応化工業株式会社 | ポジ型レジスト組成物及びレジストパターン形成方法 |
US7771913B2 (en) * | 2006-04-04 | 2010-08-10 | Shin-Etsu Chemical Co., Ltd. | Resist composition and patterning process using the same |
JP4466881B2 (ja) | 2007-06-06 | 2010-05-26 | 信越化学工業株式会社 | フォトマスクブランク、レジストパターンの形成方法、及びフォトマスクの製造方法 |
KR100960252B1 (ko) | 2007-09-12 | 2010-06-01 | 도오꾜오까고오교 가부시끼가이샤 | 레지스트 조성물, 레지스트 패턴 형성 방법, 신규 화합물 및 그 제조 방법, 그리고 산발생제 |
KR100933984B1 (ko) * | 2007-11-26 | 2009-12-28 | 제일모직주식회사 | 신규 공중합체 및 이를 포함하는 레지스트 조성물 |
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DE60100463T2 (de) * | 2000-04-04 | 2004-05-13 | Sumitomo Chemical Co., Ltd. | Chemisch verstärkte, positiv arbeitende Resistzusammensetzung |
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- 2004-11-24 KR KR1020067010062A patent/KR20060133978A/ko active Search and Examination
- 2004-11-24 US US10/580,768 patent/US20070105038A1/en not_active Abandoned
- 2004-11-24 TW TW093136169A patent/TWI321268B/zh active
- 2004-11-24 WO PCT/JP2004/017405 patent/WO2005052693A1/ja active Application Filing
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JP2000137327A (ja) * | 1998-08-26 | 2000-05-16 | Sumitomo Chem Co Ltd | 化学増幅型ポジ型レジスト組成物 |
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JP2001183636A (ja) * | 1999-12-24 | 2001-07-06 | Fuji Photo Film Co Ltd | 樹脂層付基板の形成方法並びにこれを用いた基板、液晶素子 |
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JP2004101642A (ja) * | 2002-09-05 | 2004-04-02 | Fuji Photo Film Co Ltd | レジスト組成物 |
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TW200519540A (en) | 2005-06-16 |
TWI321268B (en) | 2010-03-01 |
JP2005164633A (ja) | 2005-06-23 |
US20070105038A1 (en) | 2007-05-10 |
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