WO2007105776A1 - 下層膜形成用組成物及びパターン形成方法 - Google Patents
下層膜形成用組成物及びパターン形成方法 Download PDFInfo
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- WO2007105776A1 WO2007105776A1 PCT/JP2007/055147 JP2007055147W WO2007105776A1 WO 2007105776 A1 WO2007105776 A1 WO 2007105776A1 JP 2007055147 W JP2007055147 W JP 2007055147W WO 2007105776 A1 WO2007105776 A1 WO 2007105776A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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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
Definitions
- the present invention relates to a resist underlayer film forming composition and a pattern forming method. More specifically, the present invention relates to a fine processing in a lithographic process using a variety of radiation, which contains a polymer having a naphthalene derivative structure, and more particularly.
- the present invention relates to a composition for forming an underlayer film suitable for production of a highly integrated circuit element and a pattern forming method.
- a multilayer resist process is used in order to obtain a higher degree of integration.
- the processing size can be reduced by the multilayer resist process.
- a liquid underlayer film forming composition is first applied on a substrate and cured to obtain a resist underlayer film.
- a liquid photoresist composition is further applied to the resist underlayer film.
- the mask pattern is transferred by a reduction projection exposure apparatus (stepper) and developed with an appropriate developer to obtain a photoresist pattern.
- this pattern is transferred to the resist underlayer film by dry etching.
- the resist underlayer film pattern is transferred to the substrate by dry etching.
- a desired substrate with a pattern can be obtained.
- a multilayer process using one type of resist underlayer film is sometimes called a two-layer resist process, and when two types are used, it is sometimes called a three-layer resist process.
- the resist underlayer film functions as an antireflection film that absorbs radiation reflected from the substrate, and a material having a high carbon content is generally used.
- a resist underlayer film with a high carbon content improves the etching selectivity during substrate processing and enables more accurate pattern transfer.
- a thermosetting phenol novolak is well known.
- a composition containing a polymer having a acenaphthylene skeleton is also known as a resist underlayer film exhibiting good characteristics (for example,
- Patent Documents 1 and 2 are referred to Patent Documents 1 and 2.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-143937
- Patent Document 2 Japanese Patent Laid-Open No. 2001-40293
- the present invention provides a composition for forming an underlayer film that can form a resist underlayer film that has a function as an antireflection film and is excellent in pattern transfer performance, etching selectivity, and anti-intermixing effect. And a pattern forming method using the composition for forming an underlayer film.
- the present inventors have found that the naphthalene derivative exhibits the above characteristics in the composition for forming an underlayer film.
- the present invention has been found to be extremely useful as a compound that can be exhibited, and has high etching selectivity, antireflection effect (pattern transfer performance), and intermixing prevention effect as compared with conventional underlayer film forming compositions. It came to make.
- the present invention provides the following underlayer film forming composition and pattern forming method.
- a composition for forming an underlayer film comprising a polymer (A) having a naphthalene derivative structural unit represented by the following general formula (1).
- R is a hydroxyl group, a C 1-6 substitutable alkyl group, a C 1-6 substitution.
- n is an integer of 0-6. However, when n is 2 to 6, a plurality of R may be the same or different.
- X represents a methylene group, a substitutable alkylene group having 2 to 20 carbon atoms, a substitutable arylene group having 6 to 14 carbon atoms, or an alkylene ether group.
- m is an integer of 1-8. When m is 2 to 8, a plurality of X may be the same or different.
- 11 + 111 is an integer between 1 and 8.
- a resist film forming process for forming a resist film, an exposure process for selectively exposing the resist film through a photomask, a developing process for developing the exposed resist film, and etching the resist underlayer film and the substrate to be processed A pattern forming method comprising: an etching step.
- composition for forming an underlayer film of the present invention has a function as an antireflection film, and exhibits V and a good effect when the pattern transfer performance, etching selectivity, and intermixing prevention effect are improved. It is.
- the pattern forming method of the present invention can form a resist underlayer film that has a function as an antireflection film and that has good pattern transfer performance, etching selectivity, and anti-intermixing effect. There is an effect.
- composition for forming an underlayer film of the present invention contains a polymer (A) having a naphthalene derivative structural unit represented by the following general formula (1) (hereinafter also referred to as "polymer (A)"). To do.
- R is a hydroxyl group, a C1-C6 substitutable alkyl group, a C1-C6 substitutable alkoxy group, C2-CLO: a LO substitutable alkoxycarbonyl group
- C6-C6 14 represents a substitutable aryl group or a substitutable glycidyl ether group having 2 to 6 carbon atoms
- n is an integer of 0 to 6.
- X represents a methylene group, a substitutable alkylene group having 2 to 20 carbon atoms, a substitutable arylene group having 6 to 14 carbon atoms, or an alkylene ether group.
- m is an integer of 1-8. When m is 2 to 8, a plurality of X may be the same or different.
- 11 + 111 is an integer between 1 and 8.
- the polymer (A) is a polymer having a naphthalene derivative structural unit (hereinafter also referred to as “structural unit (i)”).
- the structural unit (i) has a substituent R and a substituent X.
- Substituent R is a hydroxyl group (hydroxyl group), a C1-C6 substitutable alkyl group, a C1-C6 substitutable alkoxy group, a C2-C10 substitutable alkoxycarbonyl group, carbon It is a substitutable aryl group having 6 to 14 carbon atoms or a substitutable glycidyl ether group having 2 to 6 carbon atoms.
- N is an integer of 0-6. However, when n is 2 to 6, a plurality of substituents R may be the same or different.
- examples of the monovalent atom or organic group other than the hydrogen atom represented by the substituent R include an alkenyl group, a nitro group, an amino group, an acyl group, a carboxyl group, a sulfonic acid group, a mercapto group, and a hydroxymethyl group. It may be a group, an ester group, an epoxy group, or the like.
- the alkyl group is preferably a linear or branched alkyl group having 1 to 6 carbon atoms, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert butyl and the like.
- the alkenyl group is preferably a linear or branched alkenyl group having 2 to 6 carbon atoms, such as vinyl and aryl.
- the acyl group is preferably an aliphatic or aromatic acyl group having 1 to 6 carbon atoms.
- acetyl group and the like can be mentioned.
- the amino group is preferably a primary amino group.
- the structural unit represented by the following formula (2) (hereinafter also referred to as "structural unit (mouth)"! Is preferred. ! / ⁇ .
- Examples of X in the structural unit (i) include an alkylene group, an arylene group, and an alkylene ether group.
- the alkylene group preferably has 1 to 20 carbon atoms and can be substituted. Examples thereof include a methylene group and an ethylene group.
- the arylene group preferably has 6 to 14 carbon atoms and can be substituted. Examples thereof include a phenylene group and a naphthalene group.
- M is an integer of 1-8. When m is 2 to 8, a plurality of X may be the same or different. The above n + m is an integer from 1 to 8.
- a group having a structure represented by the following formula (3) (hereinafter, also referred to as “structural unit (c)”), and a structure represented by Z or the following formula (4) (Hereinafter also referred to as “structural unit (2)”) is preferred.
- the content of the structural unit (i) is preferably 30 to 300 mol% with respect to the entire polymer (A). More preferably, it is 50-: LOO mol%. If the amount is less than 30 mol%, the molecular weight becomes too large and the applicability of the composition for forming a lower layer film tends to deteriorate. On the other hand, when the amount is more than 300 mol%, the molecular weight is too low, and when spin coating is performed on the composition for forming an underlayer film, striations tend to occur.
- Mw weight average molecular weight
- Mw weight average molecular weight
- the components may volatilize during film firing and the desired film thickness may not be obtained! / ⁇ and! ⁇ ⁇ may occur, and if it exceeds 8,000, the solubility in the solvent will be reduced. The problem of degradation may occur.
- the polymer ( ⁇ ) is, for example, one containing a structural unit (i) having a structural unit (mouth) in the substituent R (also referred to as “polymer (A-1)”), a substituent X Containing structural unit (c) and structural unit (ii) having structural unit (ii) (also referred to as “polymer ( ⁇ —2)”), and the structural unit (mouth) for substituent R It is preferable that the substituent X has a structural unit (c) and a structural unit (2) (also referred to as “polymer ( ⁇ -3)”).
- the polymer ( ⁇ -2) can be synthesized, for example, in the step (i) or the step (ii) described below.
- Step (i) is a step of condensing a naphthalene derivative and an aldehyde in the presence of an acid catalyst, or co-condensing with other co-condensable components.
- Step (ii) includes a naphthalene derivative and divinyl. This is a step of co-condensing compounds with other components capable of single condensation or other co-condensation in the presence of an acid catalyst.
- co-condensable components include, for example, styrene, a-methyl styrene, o-methylol styrene, m-methyl styrene, p-methylol styrene, o-hydroxy styrene, m-hydroxy styrene.
- Substituted styrene compounds such as p-hydroxystyrene, o-acetoxystyrene, m-acetoxystyrene, p-acetoxystyrene, p-t-butoxystyrene; vinyl acetate, butyl propionate, butyl caproate
- Carboxylic acid butyl ester compounds such as: (meth) acrylonitrile, cyanogenated vinyl compounds such as a-cycloacrylonitrile; methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate , N-butyl (meth) acrylate, n-hexyl (meth) acrylate, glycidyl (meth) Unsaturated carboxylic acid ester compounds such as acrylate, etc .; Unsaturation such as ethylene glycol di (meth) acrylate, propylene
- Halogen-containing bur compounds such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, (meth) aryl alcohol and other hydroxyl-containing butyl compounds; (meth) acrylamide, crotonic acid Amyl group-containing bur compounds such as amides; 2-Methyl chlorooxy succinic succinic acid, 2-methacryloyl oxychethyl maleic acid-containing bur compounds such as 1 bur naphthalene, 2 bur naphthalene, 9 Examples thereof include burreel compounds such as berylanthracene and 9-bicarbcarbazole.
- the structural ratio of the structural unit (b) constituting the polymer (A) and the component (compound) capable of cocondensation is such that the component (co-condensable) is co-condensable with respect to the total molar amount of both. things) is 5: more preferably it is preferred tool containing LOO mol%. 10 to: LOO mol 0/0, more preferably contains 20-100 mole%.
- aldehydes include saturated aliphatic aldehydes such as formaldehyde, paraformaldehyde, acetate aldehyde, propyl aldehyde; unsaturated aliphatic aldehydes such as acrolein and methacrolein; heterocyclic aldehydes such as furfural; benzaldehyde And aromatic aldehydes such as naphthylaldehyde and anthraldehyde. Particularly preferred are formaldehyde, paraformaldehyde and furfural. These can be used alone or in combination of two or more.
- the amount of the aldehyde used is preferably 1 to 10,000 parts by mass, particularly preferably 30 to 120 parts by mass with respect to 100 parts by mass of the naphthalene derivative.
- aromatic hydrocarbons hereinafter also referred to as "aromatics"
- aromatics may be added as other co-condensation components.
- the aromatics are used as a reaction component together with a naphthalene derivative.
- the condensation reaction is carried out by mixing the naphthalene derivative, aromatics and aldehydes and heating them in the absence of a solvent or in the presence of an acid catalyst.
- Aromatics include V and shear, as long as they are aromatics capable of cocondensation polymerization with naphthalene derivatives. Can also be used.
- unsubstituted aromatic hydrocarbons such as benzene, naphthalene, anthracene, phenanthrene, and acenaphthene
- alkyl-substituted aromatic hydrocarbons such as toluene, m-xylene, p-xylene, and 1-methylnaphthalene
- phenol, cresol 1 Hydroxy-substituted aromatic hydrocarbons such as naphthol, bisphenols and polyhydric phenols
- Carboxyl-substituted aromatic hydrocarbons such as benzoic acid, 1 naphthalenecarboxylic acid and 9 anthracenecarboxylic acid
- Substituted aromatic hydrocarbons such as black benzene and bromobenzene.
- the amount of the aromatics and aldehydes used in the condensation reaction is such that the aromatics are 10,000 parts by weight or less and the aldehydes are 1 to 1,000 parts by weight with respect to 100 parts by weight of the naphthalene derivative. preferable.
- Examples of the acid catalyst used in the condensation reaction include mineral acids such as sulfuric acid, phosphoric acid and perchloric acid; P organic sulfonic acids such as toluenesulfonic acid; carboxylic acids such as formic acid and oxalic acid. It is done.
- the amount of the acid catalyst used is variously selected depending on the type of acids used. For example, with respect to 100 parts by mass of acenaphthylenes, it is particularly preferably 0.001 to 10,000 parts by mass, and particularly preferably 0.01 to L: 000 parts by mass.
- the reaction temperature during the condensation is preferably 40 ° C to 200 ° C.
- the reaction time is preferably a force of 30 minutes to 72 hours, variously selected depending on the reaction temperature.
- the Mw of the polymer (A) obtained as described above is preferably 1,000 to 1,000,000, particularly preferably 5,000 to 500,000.
- divinyl compounds examples include dibutenebenzene, dicyclopentagen, tetrahydroindene, 4-bulcyclohexene, 5-burnoborna-2en, ⁇ -pinene, 13 binene, limonene, 5-burnorbornagen, etc. Particularly preferred is dibutylbenzene. These can be used alone or in combination of two or more.
- the amount of divinyl compounds used is usually 1 to L0,000 parts by mass, preferably 30 to 120 parts by mass with respect to 100 parts by mass of the naphthalene derivative.
- aromatic hydrocarbons may be added as another co-condensation component.
- the aromatics are used as a reaction component together with a naphthalene derivative.
- the condensation reaction in this case is carried out by mixing the naphthalene derivative, aromatics and dipyl compounds and heating in the presence of an acid catalyst in a solvent-free or solvent.
- any aromatics that can be co-condensation polymerized with a naphthalene derivative in the same manner as in the above step (i) can be used.
- the same thing as what was illustrated at the said (i) process can be mentioned. These can be used alone or in combination of two or more.
- the amount of the aromatics and aldehydes used in the condensation reaction is 1 to aldehydes, preferably aromatics of 10,000 parts by weight or less, with respect to 100 parts by weight of the naphthalene derivative: L, 000 parts by mass is preferred.
- Examples of the acid catalyst used in the condensation reaction include mineral acids such as sulfuric acid, phosphoric acid and perchloric acid; organic sulfonic acids such as P-toluenesulfonic acid; carboxylic acids such as formic acid and oxalic acid. Can be mentioned.
- the amount of the acid catalyst used may be variously selected depending on the kind of the acid, but it is preferably 0.001 to 10,000 parts by mass, particularly preferably 0.01 to 100 parts by mass of the acenaphthylene. ⁇ : L, 000 parts by mass.
- the reaction temperature during the condensation is preferably 40 ° C to 200 ° C.
- the reaction time is preferably a force of 30 minutes to 72 hours, variously selected depending on the reaction temperature.
- the Mw of the polymer (A) obtained in the above manner is preferably 1,000-1,000,000, and particularly preferably ⁇ 5,000-500,000.
- the ratio of the structural unit (c) and the structural unit (2) in the polymer (A-2) is preferably 5 to L00 mol% with respect to the structural unit (ii). More preferably, it is 10 to 50 mol%. If the amount is less than 5 mol%, the amount of unreacted naphthalene derivative increases, and the yield tends to deteriorate. On the other hand, if it is more than 100 mol%, a large amount of residual monomer tends to remain.
- the ratio of the structural unit (2) to the structural unit (c) is preferably 50 to: L00 mol%.
- Polymer (A-1) The polymer (A) is, for example, a step in which a naphthalene ring of a naphthalene derivative and a vinyl compound that is a component that can be co-condensed with the naphthalene derivative are allowed to act in the presence of an acid catalyst (“(iii) step” “Tomo! / ⁇ ⁇ ) You can also synthesize it.
- the substituent R can be a substituent having a structural unit derived from a beluie compound.
- Examples of the above-mentioned bur compounds include bulubenzene, dibulubenzene, dicyclopentagen, tetrahydroindene, 4-vinylcyclohexene, 5-vinyl noborner 2-ene, a-vinene, 13-vinene, limonene, butadiene and the like. Is mentioned.
- the polymer (A-1) can be synthesized by using bullbenzene as the beluie compound in the step (iii).
- the ratio of the structural unit (mouth) in the polymer (A-1) is preferably 10 to: LOO mol%, more preferably 20 to 50 mol% with respect to the structural unit (i). It is. If the amount is less than 10 mol%, the amount of unreacted naphthalene derivative increases, and the yield tends to deteriorate. On the other hand, if it is more than 100 mol%, a large amount of residual monomer tends to remain.
- the polymer (A-3) can be prepared, for example, by performing the steps (i) and (iii) or by performing the steps (ii) and (iii). , (Ii) step, and (iii) step.
- the order of step (i), step (ii), and step (iii) is not particularly limited.
- the ratio of the structural unit (mouth), structural unit (c), and structural unit (2) in the polymer (A-3) is 10 to LOO mol% relative to the structural unit (ii). More preferably, it is 20 to 50 mol%. If the amount is less than 10 mol%, the amount of unreacted naphthalene derivatives increases, and the yield tends to deteriorate. On the other hand, if it is more than 100 mol%, a large amount of residual monomer tends to remain.
- the ratio of structural units to structural units (iii) (d) is 50: It is preferred that L00 mol 0/0.
- the substituent X is Step for obtaining a structure having the structure represented by the general formula (5) (also referred to as “(iv) step”) Mame.
- Y represents a methylene group, a substitutable alkylene group having 2 to 20 carbon atoms, or a substitutable arylene group having 6 to 14 carbon atoms.
- Bifunctional epoxies are those having at least two epoxy groups in the molecule.
- Commercially available products include Epicoat 1001, 1002, 1003, 1004, and 1007.
- Bisphenol A type epoxy resin such as 1009, 1010, and 828 (trade name; manufactured by Yuka Shell Epoxy); bisphenol F type epoxy such as Epicoat 807 (trade name; manufactured by Yuka Shell Epoxy) Enocoat 152, 154 (trade name; manufactured by Yuka Shell Epoxy), EPPN201, 202 (trade name; manufactured by Nippon Kayaku Co., Ltd.), etc., phenol novolac type epoxy resin; EOCN102, 103S, 104S, 1020, 1025, 1027 (trade name; manufactured by Enomoto Yakuyaku Co., Ltd.), Epicoat 180S75 (product name; manufactured by Yuka Shell Epoxy), etc.
- the composition for forming an underlayer film of the present invention contains the polymer (A), but this composition is preferably a liquid containing a solvent that dissolves the polymer (A).
- the content of the polymer (A) is preferably 8 to 30% by mass, more preferably 10 to 15% by mass.
- Solvent The solvent used in the composition for forming an underlayer film of the present invention is not particularly limited as long as it can dissolve the polymer (A).
- Ethylene glycol monoalkyl ethers such as ethylene glycol monomethenoate ethere, ethylene glyconomonoethylenoate, ethylene glycol monomonopropynoleate, ethylene glycol monobutyl ether;
- Ethylene glycol monoalkyl ether acetates such as ethylene glycol monomethenoate etherate acetate, ethylene glycol monoethyl ethinoate etherate, ethylene glycol mono n propyl ether acetate, ethylene glycol mono n -butyl ether acetate;
- Diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, diethylene glycol dibutyl ether;
- Triethylene glycol dialkyl ethers such as triethylene glycol dimethyl ether and triethylene glycol jetyl ether;
- Propylene glycol monoalkyl ethers such as propylene glycol nore monomethinole ether, propylene glycol nole mono enoate ethere, propylene glycol nole mono n-propinole ether, propylene glycol nore mono n-butyl ether;
- Propylene glycol dialkyl ethers such as propylene glycol dimethylol ether, propylene glycol diethyl ether, propylene glycol di n-propyl ether, propylene glycol di-n-butylol ether;
- Propylene glycolate monomethyl ether acetates such as propylene glycol monomethenoate acetate, propylene glycol monometholeate acetate, propylene glycol mono- n -propyl ether acetate, propylene glycol mono-n-butenoate etherate acetate, etc.
- propylene glycol monomethenoate acetate such as propylene glycol monomethenoate acetate, propylene glycol monometholeate acetate, propylene glycol mono- n -propyl ether acetate, propylene glycol mono-n-butenoate etherate acetate, etc.
- propylene glycolate monomethyl ether acetates such as propylene glycol monomethenoate acetate, propylene glycol monometholeate acetate, propylene glycol mono- n -propyl ether acetate, propylene glycol mono-n-butenoate etherate acetate,
- Lactic acid esters such as methyl lactate, ethyl acetate, n-propyl lactate, i-propyl lactate, n-butyl lactate and i-butyl lactate;
- Aromatic hydrocarbons such as toluene and xylene
- Ketones such as methyl ethyl ketone, methyl- n -propyl ketone, methyl-n-butyl ketone, 2-heptanone, 3-heptanone, 4-heptanone, cyclohexanone;
- Amides such as N-methylformamide, N, N dimethylformamide, N-methylacetamide, N, N dimethylacetamide, N-methylpyrrolidone;
- solvents propylene glycol monomethyl ether, ethylene glycol monoethyl ether acetate, ethyl acetate, lactate, n-butyl acetate, ethyl 3-ethylpropionate, methyl 3-methoxypropionate, 2 Heptanone, cyclohexanone, ⁇ -petit rataton, etc.
- solvents can be used alone or in admixture of two or more.
- the amount of the solvent used is such that the solid content concentration of the resulting composition is preferably 5 to 80% by mass, more preferably 5 to 40% by mass, and particularly preferably 10 to 30% by mass. It is a range.
- composition for forming an underlayer film of the present invention as long as the desired effect of the present invention is not impaired. If necessary, it is preferable to further blend an acid generator (C), a crosslinking agent (D), and an additive (B).
- the additive (B) include a binder resin, a radiation absorber, and a surface active agent.
- the acid generator (C) is a component that generates an acid upon exposure or heating.
- Examples of the acid generator that generates an acid upon exposure include diphenyl-trifluormethanesulfonate, diphenyl-monononofreolone n — Butansnorephonate, Diphenenoleodonpirensnoleonate, Dipheo-Rhodonium n-Dodecylbenzenesulfonate, Diphenol-Neodon 10-Force Nfencenorephonate, Diphenenoleodium Naphthalene Sunolephonate, Dipheninoreno Donahexafluoroantimonate,
- Halogen-containing compound-based photoacid generators such as phenolbis (trichloromethyl) s triazine, 4-methoxyphenylbis (trichloromethyl) -s triazine, 1-naphthylbis (trichloromethyl) -s triazine;
- Diazoketone compound photoacid generators such as Dido 5-sulfonic acid ester
- Sulfone compound-based photoacid generators such as 4-trisphenacylsulfone, mesitylphenacylsulfone, bis (phenolsulfol) methane;
- Benzoin tosylate, pyrogallol tris (trifluoromethanesulfonate), nitrobenzyl-1,9,10 ethoxyanthracene-2-sulfonate, trifluoromethanesulfonylbicyclo [2,2,1] hepto-5-ene-2,3 dicarbodiimide examples thereof include sulfonic acid compound photoacid generators such as N-hydroxysuccinimide trifluoromethanesulfonate and 1,8 naphthalenedicarboxylic acid imide trifluoromethanesulfonate.
- thermal acid generator examples include, for example, 2, 4, 4, 6-tetrabromocyclohexagenone, benzoin tosylate 2--trobenzyl tosylate, alkyl sulfonates and the like. These thermal acid generators can be used alone or in admixture of two or more. As the acid generator, a photoacid generator and a thermal acid generator can be used in combination.
- the amount of the acid generator to be blended is preferably 5,000 parts by mass or less, more preferably 0.1 to 1,000 parts by mass per 100 parts by mass of the solid content of the composition for forming the lower layer film. Particularly preferred is 0.1 to L00 parts by mass.
- the composition for forming an underlayer film of the present invention contains a photoacid generator and Z or a thermal acid generator, thereby effectively causing a crosslinking reaction between molecular chains of each polymer at a relatively low temperature including normal temperature. be able to.
- the crosslinking agent (D) prevents intermixing between the resist underlayer film obtained by curing the composition for forming the underlayer film and the resist film formed on the resist underlayer film. It is a component having an action of preventing cracks in the resist underlayer film.
- a crosslinking agent polynuclear phenols and various commercially available curing agents can be used.
- polynuclear phenols examples include binuclear phenols such as 4,4'-biphenoldiol, 4,4'-methylenebisphenol, 4,4, ethylidenebisphenol, and bisphenol A. 4, 4, 4, 1 methylidene trisphenol, 4, 4, 1 [1- ⁇ 4-(1-[4 hydroxyphenyl] 1-methylethyl) phenyl ⁇ ethylidene] bisphenol, etc. 3; Nuclear phenols; polyphenols such as novolak and the like.
- polynuclear phenols 4, 4, 1 [1 ⁇ 4 1 (1- [4-hydroxyphenyl] 1-methylethyl) phenyl ⁇ ethylidene] bisphenol, novolak and the like can be mentioned.
- the polynuclear phenols can be used alone or in admixture of two or more.
- Examples of the hardener include 2,3 tolylene diisocyanate, 2,4 tolylene diisocyanate, 3,4-tolylene diisocyanate, 3,5-tolylene diisocyanate, 4 , 4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, 1,4-cyclohexane diisocyanate,
- curing agents melamine curing agents, glycoluril curing agents and the like are preferable.
- curing agent can be used individually or in mixture of 2 or more types.
- polynuclear phenols and a curing agent can be used in combination as a crosslinking agent.
- the blending amount of the cross-linking agent is preferably 5,000 parts by mass or less, more preferably 1,000 parts by mass or less, per 100 parts by mass of the solid content of the composition for forming a lower layer film.
- the additive is a component other than the acid generator (C) and the crosslinking agent (D) among the components added to the composition for forming the lower layer film, and is an intermix between the resist lower layer film and the resist film. It is a component having effects such as preventing thinning and improving the coating properties of the composition for forming a lower layer film.
- the additive (B) include a binder resin, a radiation absorber, and a surfactant.
- thermoplastic resins and thermosetting resins can be used.
- thermoplastic rosin for example,
- Polymers of diolefin carboxylic acid esters such as sorbic acid esters and muconic acid esters; polymers of ⁇ , ⁇ -unsaturated carboxylic acid thioesters such as (meth) acrylic acid thioesters and ⁇ chloroacrylic acid thioesters
- Polymers of (meth) acrylonitrile such as (meth) acrylonitrile and ⁇ -chloroacrylo-tolyl or derivatives thereof
- (meth) acrylamide, ⁇ , ((meth) acrylamide such as dimethyl (meth) acrylamide or the like Polymers of derivatives; Polymers of styryl metal compounds; Polymers of vinyloxy metal compounds; Polyimines; Polyethers such as poly-phenoxide, poly-1,3 dioxolane, polyoxirane, polytetrahydrofuran, and polytetrahydropyran Polysulfides; Polysulfonamides; Polype Peptides; polyamides such as
- Polyesters such as aliphatic polyesters, aromatic polyesters, alicyclic polyesters, and polycarbonates; polyureas; polysulfones; polyazines; polyamines; polyaromatic ketones; polyimides; Polybenzoxazoles; polybenzothiazoles; polyaminotriazoles; polyoxadiazoles; polypyrazoles; polytetrazoles; polyquinoxalines; polytriazines; polybenzoxazinones; polyquinolines;
- thermosetting resin is cured by heating and becomes insoluble in a solvent, and has an action of preventing intermixing between the obtained resist lower layer film and a resist film formed thereon. It can be preferably used as a binder resin.
- thermosetting resins include thermosetting acrylic resins, phenol resins, urea resins, melamine resins, amino resins, aromatic hydrocarbon resins, epoxy resins. Examples thereof include fats and alkyd sallows. Of these thermosetting resins, urea resins, melamine resins and aromatic hydrocarbon resins are preferable.
- the Norder's rosin can be used alone or in admixture of two or more.
- the amount of binder resin is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, per 100 parts by mass of the polymer of each composition for forming a lower layer film.
- Examples of the radiation absorber include oil-soluble dyes, disperse dyes, basic dyes, methine dyes, pyrazole dyes, imidazole dyes, hydroxyazo dyes, and the like; bixin derivatives, norbixin , Stilbene, 4,4, -diaminostilbene derivatives, coumarin derivatives, pyrazoline derivatives, and other fluorescent whitening agents; hydroxyazo dyes, tinuvin 234 (trade name, manufactured by Ciba Gaigi Co., Ltd.), chinuvin 1130 (trade name, Ciba-gaigi UV absorbers such as anthracene derivatives and the like; and aromatic compounds such as anthracene derivatives and anthraquinone derivatives.
- the radiation absorbers can be used alone or in admixture of two or more.
- the blending amount of the radiation absorber is preferably 100 parts by mass or less, more preferably 50 parts by mass or less, per 100 parts by mass of the solid content of the composition for forming a lower layer film.
- the surfactant is a component having an action of improving coatability, striation, wettability, developability and the like.
- Such surfactants e.g., Poriokishechire down lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene O Les Irueteru, polyoxyethylene n - O Chi Ruff enyl ether, Poriokishechi Ren n Nonirufue two Noreeteru, polyethylene glycol dilaurate Noon surfactants such as polyethylene glycol distearate and the following trade names: KP341 (manufactured by Shin-Etsu Chemical Co., Ltd.), Polyflow No. 75, No.
- examples of the additive (B) other than the above include a storage stabilizer, an antifoaming agent, an adhesion aid and the like.
- underlayer film composition The method of forming a resist pattern using the composition for forming an underlayer film of the present invention is as follows: 1) Applying the underlayer film composition on a substrate and obtaining the coating film A resist underlayer film forming step for curing a resist underlayer film, 2) applying a resist composition solution on the resist underlayer film, pre-betaing the obtained coating film to form a resist film A film forming process, 3) an exposure process for selectively exposing the resist film through a photomask, 4) a developing process for developing the exposed resist film, and 5) an etching process for etching the resist underlayer film.
- underlayer film composition is as follows: 1) Applying the underlayer film composition on a substrate and obtaining the coating film A resist underlayer film forming step for curing a resist underlayer film, 2) applying a resist composition solution on the resist underlayer film, pre-betaing the obtained coating film to form a resist film A film forming process, 3) an exposure process for selectively exposing the resist film through a photomas
- the substrate for example, a silicon wafer, a wafer coated with aluminum, or the like can be used.
- the underlayer film composition can be applied by an appropriate method such as spin coating, cast coating, or roll coating. Then, the coating film is cured by exposure and Z or heating.
- the radiation to be exposed is appropriately selected from visible light, ultraviolet light, far ultraviolet light, X-rays, electron beams, y-rays, molecular beams, ion beams, etc., depending on the type of photoacid generator used.
- the underlayer film composition contains a photoacid generator and is exposed, the coating film can be effectively cured even at ordinary temperature.
- the heating temperature is preferably about 90 to 350 ° C, more preferably about 200 to 300 ° C.
- the lower layer film composition contains a thermal acid generator, the coating film can be effectively cured even at about 90 to 150 ° C., for example.
- the thickness of the resist underlayer film formed in this step is preferably 0.1 to 5 / ⁇ ⁇ .
- Resist film forming step A resist composition solution is applied on the resist underlayer film so that the resist film has a predetermined thickness. Then, pre-beta is used to volatilize the solvent in the coating film to form a resist film.
- the temperature of the prebeta at this time is appropriately adjusted according to the type of the resist composition and the like, but is preferably about 30 to 200 ° C, more preferably 50 to 150 ° C.
- Examples of the resist composition include a positive or negative chemically amplified resist composition containing a photoacid generator, a positive resist composition comprising an alkali-soluble resin and a quinonediazide photosensitizer, Examples thereof include a negative resist composition comprising an alkali-soluble resin and a crosslinking agent.
- the resist composition solution used for forming the resist film on the resist underlayer film has a solid content concentration of preferably about 5 to 50% by mass before the formation of the resist film. For example, it is filtered with a filter with a pore size of about 0.2 m. In this step, a commercially available resist composition solution can be used as it is.
- the radiation used for exposure should be visible, ultraviolet, deep ultraviolet, X-ray, electron beam, gamma ray, molecular beam, ion beam, etc.
- the power selected by the laser is preferably far ultraviolet rays, and in particular, KrF excimer laser (248 nm), ArF excimer laser (193 nm), F excimer laser (wavelength 157 ⁇ )
- Extreme ultraviolet rays (wavelength 13 nm, etc.) are preferred.
- the resist film after exposure is developed, washed, and dried to form a predetermined resist pattern.
- post-beta can be performed after exposure and before development in order to improve resolution, pattern profile, developability, and the like.
- the developer used in this step is appropriately selected depending on the type of the resist composition used, but a positive chemically amplified resist composition or a positive resist composition containing an alkali-soluble resin.
- the developer include sodium hydroxide, hydroxide power, sodium carbonate, sodium silicate, sodium metasilicate, ammonia, ethylamine, n-propylamine, jetylamine, di-n-propylamine, triethylamine.
- Methyl Jetylamine dimethyl * ethanolamine, triethanolamine, tetramethylammonium hydroxide, tetraethylammonium hydroxide, pyrrole, piperidine, coryne, 1,8-diazabicyclo [5.4.0] —7-undecene,
- An alkaline aqueous solution such as 1,5-diazabicyclo [4.3.0] -5-nonene can be mentioned.
- an appropriate amount of a water-soluble organic solvent for example, an alcohol such as methanol or ethanol, or a surfactant can be added to these alkaline aqueous solutions.
- etching of the resist underlayer film is performed using gas plasma such as oxygen plasma. Then, a resist pattern for processing a predetermined substrate is obtained.
- a composition for forming an underlayer film was spin-coated on a silicon wafer having a diameter of 8 inches and then heated on a 300 ° C. hot plate for 120 seconds to form a resist underlayer film having a thickness of 0.3 m.
- the refractive index (n value) and absorbance (k value) at a wavelength of 193 nm were measured using a spectroscopic ellipsometer V UV—VASE manufactured by J. A. WOOLLAM.
- the noturn shape was evaluated by observing the pattern shape of the resist film of the performance evaluation sample with a scanning electron microscope.
- the evaluation result was “good” in the case of a rectangle, and “bad” in shapes other than the rectangle (eg, T-top, scum, etc.).
- the standing wave prevention effect is the effect of standing waves on the resist film in the performance evaluation sample. The presence or absence of was observed with a scanning electron microscope and evaluated. The evaluation result was “good” when the standing wave due to reflection from the resist underlayer film was not seen on the side of the pattern, and “bad” when standing wave was seen.
- a resist underlayer film was formed, and this resist underlayer film was immersed in a hexanone at room temperature for 1 minute, and the change in film thickness before and after immersion was measured.
- a spectroscopic ellipsometer UV1280E manufactured by KLA-Tencor was used. The evaluation results were “good” when no film thickness change was observed and “bad” when film thickness change was observed.
- a resist underlayer film is formed, and this resist underlayer film is etched using an etching apparatus EXAM (manufactured by Shinko Seiki Co., Ltd.).
- EXAM manufactured by Shinko Seiki Co., Ltd.
- CF ZArZO CF: 40 mL / min, Ar
- Etching was performed at a temperature of 15 ° C.
- the etching resistance was calculated by measuring the film thickness before and after the treatment.
- a reactor equipped with a condenser, thermometer and stirrer is charged with 1 part of naphthol, 100 parts of propylene glycol monomethyl ether acetate and 50 parts of paraformaldehyde, 2 parts of oxalic acid is added, and the temperature is raised to 120 ° C while dehydrating. After 5 hours of reaction, the mixture was cooled to 100 ° C. and 1 part of paratoluenesulfonic acid was added. To the reaction product, 40 parts of styrene was added dropwise at 120 ° C. over 60 minutes, held for 4 hours, and polymer (A-1) reacted at 140 ° C. for 2 hours was obtained.
- Mw of the polymers (A-1) to (A-3) obtained in the above synthesis examples 1 to 3 is a GP C column (G2000HXL: 2, G3000HXL: 1) manufactured by Tosoh Corporation. Flow rate: 1. OmlZ min, elution Solvent: Tetrahydrofuran, Column temperature: Measured by gel permeation chromatography (detector: differential refractometer) using monodisperse polystyrene as a standard under the analysis conditions of 40 ° C.
- the coagulated rosin is washed several times with the mixed solvent and then vacuum-dried to obtain the following formulas (a) to (c) derived from each of the monomers (a), (b) and (c).
- the molar ratio of each of the repeating units represented by 4) was 18:18, and Mw was 27,000 (yield 60%).
- the molecular weight of this resin was measured in the same manner as in the above polymers (A-1) to (A-3).
- Example 1 Preparation of composition for forming underlayer film
- 10 parts of a polymer (A-1) 10 parts of a polymer (A-1), 0.5 parts of bis (4-tert-butylphenol) jordonno nafluoro- n -butanesulfonate (C-1) as an acid generator, and the following formula (D 0.5 parts of tetramethoxymethyldarlicuril (D-1) represented by —1) was dissolved in 89 parts of propylene dallicol monomethyl acetate. This solution was filtered through a membrane filter having a pore size of 0.1 m to prepare a composition (I) for forming a lower layer film.
- a positive resist pattern for ArF was produced according to the following method.
- an underlayer film forming composition (I) was spin-coated on a silicon wafer having a diameter of 8 inches, and then heated on a hot plate at 180 ° C. and 300 ° C. for 60 seconds to obtain a film thickness of 0.3.
- a resist underlayer film of / zm was formed.
- an interlayer composition solution for a three-layer resist process (trade name “NFC SOG080J, manufactured by JSR”) is spin-coated on the resist underlayer film, and each is heated on a hot plate at 200 ° C. and 300 ° C. for 60 seconds.
- the performance evaluation results of (ArF positive resist pattern) are as follows.
- the n and k values of the optical characteristics are 1.43 and 0.52, respectively.
- the effect of preventing termixing was good respectively.
- Etching resistance (etching rate) was 180 nmZmin.
- Example 1 1) was prepared. Thereafter, in the same manner as in Example 1, the resist underlayer film and the performance evaluation sample (ArF positive resist pattern) were evaluated.
- the polymer (A-1) in Example 4 was synthesized in the synthesis examples 2 and 3, respectively (A—
- Example 1 1) was prepared. Thereafter, in the same manner as in Example 1, the resist underlayer film and the performance evaluation sample (ArF positive resist pattern) were evaluated.
- the polymer (A-1) in Example 7 was synthesized in Synthesis Examples 2 and 3, respectively (A—
- Underlayer film-forming compositions (VIII) and (IX) were prepared in the same manner as in Example 7 except that 2) and (A-3) were used. Thereafter, in the same manner as in Example 1, the resist underlayer film and performance evaluation support Samples (positive resist pattern for ArF) were evaluated.
- Example 7 The polymer (A-1) in Example 7 was replaced with the polymer (A-3) synthesized in Synthesis Example 3, and the solvent was changed to ethyl lactate to obtain propylene glycol monomethyl ether acetate.
- a composition (X) for forming an underlayer film was prepared.
- a performance evaluation sample (ArF positive resist pattern) was prepared in the same manner as in Example 1, and predetermined evaluation was performed.
- the resist underlayer film and the performance evaluation sample were evaluated in the same manner as in Example 1 except that phenol novolac resin was used instead of the underlayer film forming composition.
- the resist underlayer film and the performance evaluation sample were evaluated in the same manner as in Example 4 except that phenol novolac resin was used instead of the underlayer film forming composition.
- a resist underlayer film and a performance evaluation sample were evaluated in the same manner as in Example 7 except that phenol novolac resin was used instead of the underlayer film forming composition.
- Table 1 shows each compounding component and compounding formulation (parts) of Examples 1 to 10 and Comparative Examples 1 to 3. [0134] [Table 1]
- Table 2 shows the evaluation results of the optical characteristics, pattern shape, standing wave prevention effect, and intermixing prevention effect in Example 2 10 and Comparative Example 1 3.
- Example 1 1.43 0.52 Good Good Good Good
- Example 2 1.38 0.42 Good Good Good Good
- Example 3 1.39 0.36 Good Good Good Good
- Example 4 1.41 0.52 Good Good Good
- Example 5 1.36 0.42 Good Good Good
- Example 6 1.37 0.36 Good Good Good
- Example 7 1.40 0.50 Good Good Good
- Example 8 1.35 0.40 Good Good Good
- Example 9 1.36 0.34 Good Good Good
- Example 10 1.36 0.34 Good Good Good Good Good Good Good Good Good Good Good Good Good Good Comparative Example 1 1.38 0.72 Bad Bad Good Comparative Example 2 1.36 0.72 Bad Bad Bad Comparative Example 3 1.35 0.70 Defect Defect Defect Defect
- the underlayer film forming composition according to the present invention has excellent dry etching resistance and antireflection effect. Since an antireflection film having a high result and not causing intermixing with a resist can be formed, it is particularly useful for manufacturing a highly integrated circuit.
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- Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
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Abstract
Description
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Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07738617A EP1995636A4 (en) | 2006-03-14 | 2007-03-14 | COMPOSITION FOR FORMING A SURFACE LAYERING FILM AND METHOD FOR STRUCTURED FORMING |
| JP2008505196A JP5136407B2 (ja) | 2006-03-14 | 2007-03-14 | レジスト下層膜形成用組成物及びパターン形成方法 |
| US12/282,599 US7749681B2 (en) | 2006-03-14 | 2007-03-14 | Composition for forming lower layer film and pattern forming method |
| KR1020087024068A KR101454490B1 (ko) | 2006-03-14 | 2007-03-14 | 하층막 형성용 조성물 및 패턴 형성 방법 |
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| JP2006068525 | 2006-03-14 | ||
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| WO2007105776A1 true WO2007105776A1 (ja) | 2007-09-20 |
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| Country | Link |
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| US (1) | US7749681B2 (ja) |
| EP (1) | EP1995636A4 (ja) |
| JP (1) | JP5136407B2 (ja) |
| KR (1) | KR101454490B1 (ja) |
| CN (1) | CN101427183A (ja) |
| TW (1) | TWI414893B (ja) |
| WO (1) | WO2007105776A1 (ja) |
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| KR100896451B1 (ko) * | 2006-12-30 | 2009-05-14 | 제일모직주식회사 | 카본 함량이 개선된 고 내에칭성 반사방지 하드마스크조성물, 이를 이용한 패턴화된 재료 형상의 제조방법 |
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2007
- 2007-03-13 TW TW096108622A patent/TWI414893B/zh not_active IP Right Cessation
- 2007-03-14 US US12/282,599 patent/US7749681B2/en active Active
- 2007-03-14 JP JP2008505196A patent/JP5136407B2/ja not_active Expired - Fee Related
- 2007-03-14 CN CNA2007800145386A patent/CN101427183A/zh active Pending
- 2007-03-14 EP EP07738617A patent/EP1995636A4/en not_active Withdrawn
- 2007-03-14 WO PCT/JP2007/055147 patent/WO2007105776A1/ja not_active Ceased
- 2007-03-14 KR KR1020087024068A patent/KR101454490B1/ko active Active
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| CN101889247B (zh) * | 2007-12-07 | 2013-04-03 | 三菱瓦斯化学株式会社 | 用于形成光刻用下层膜的组合物和多层抗蚀图案的形成方法 |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR101454490B1 (ko) | 2014-10-27 |
| EP1995636A1 (en) | 2008-11-26 |
| US7749681B2 (en) | 2010-07-06 |
| KR20080105145A (ko) | 2008-12-03 |
| TW200801818A (en) | 2008-01-01 |
| US20090098486A1 (en) | 2009-04-16 |
| JPWO2007105776A1 (ja) | 2009-07-30 |
| CN101427183A (zh) | 2009-05-06 |
| TWI414893B (zh) | 2013-11-11 |
| EP1995636A4 (en) | 2010-01-27 |
| JP5136407B2 (ja) | 2013-02-06 |
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