WO2006030604A1 - レジスト組成物、レジストパターン形成方法 - Google Patents
レジスト組成物、レジストパターン形成方法 Download PDFInfo
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- WO2006030604A1 WO2006030604A1 PCT/JP2005/015165 JP2005015165W WO2006030604A1 WO 2006030604 A1 WO2006030604 A1 WO 2006030604A1 JP 2005015165 W JP2005015165 W JP 2005015165W WO 2006030604 A1 WO2006030604 A1 WO 2006030604A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
- C07D295/04—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms
- C07D295/12—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly or doubly bound nitrogen atoms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
Definitions
- Resist composition and resist pattern forming method Resist composition and resist pattern forming method
- the present invention relates to a resist composition and a resist pattern forming method.
- 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 have been used, but now KrF excimer laser (248 nm) has been introduced.
- the resist materials that satisfy the high-resolution conditions that can reproduce patterns with fine dimensions, it contains a base resin whose alkali solubility changes due to the action of acid and an acid generator that generates acid upon exposure.
- a chemically amplified resist composition is known!
- the chemically amplified resist composition includes a negative type containing a cross-linking agent and an alkali-soluble resin, which is a base resin, and a positive type containing a resin whose alkali solubility is increased by the action of an acid.
- acid generators used in such chemically amplified resist compositions acid salt generators such as odonium salts and sulfo-um salts, and oxime sulfonate acids have been used so far.
- Generating agents diazomethane acid generators such as bisalkyl or bisarylsulfonyldiazomethanes, poly (bissulfol) diazomethanes, nitrobenzyl sulfonates, iminosulfonate acid generators, disulfone acids
- a variety of generators are known.
- a so-called form salt acid generator having a high acid generating ability is mainly used (for example, see Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 7-234511
- the resist pattern has a cross-sectional shape that is so-called skirting (a state where the lower end portion is tapered). May not produce a good rectangular pattern.
- skirting a state where the lower end portion is tapered.
- oxime sulfonate acid generator an effect of improving the pattern shape can be obtained.
- the present invention has been made in view of the above circumstances, and it is an object of the present invention to improve the resist pattern temporal stability and reduce development defects in a resist composition containing an oxime sulfonate acid generator. To do.
- the present invention employs the following configuration.
- the resist composition of the present invention comprises (A) a resin component whose alkali solubility is changed by the action of an acid, (B) an oxime sulfonate acid generator, and (D) an alkyl group having 5 to 12 carbon atoms.
- a resist composition prepared by dissolving an amine compound having at least one and (E) an organic acid in an organic solvent (C) containing methyl-n-amyl ketone, the component (E) Is a dibasic acid.
- the resist composition of the present invention is coated on a substrate, pre-beta, selectively exposed, then subjected to PEB (post-exposure heating), and alkali developed to form a resist pattern .
- PEB post-exposure heating
- the resist composition of the present invention is coated on a substrate, pre-betaned, selectively exposed, then subjected to post-exposure heating (PEB), and re-development is performed.
- Resist pattern forming step for forming a resist pattern and the obtained resist And a narrowing step for narrowing the pattern size of Noturn by heat treatment.
- the “structural unit” means a monomer unit (monomer unit) constituting the polymer.
- exposure is a concept including general radiation irradiation.
- the development defect is, for example, a scum or resist pattern detected when the force directly above the resist pattern after development is observed with a surface defect observation device (trade name “KLA”) manufactured by KLA Tencor. It is a general defect. Such differentials are a very big problem because they cause a decrease in process yield and product performance.
- the resist pattern stability over time is evaluated as follows. That is, after storing the prepared resist composition for a certain period of time in different environments (for example, a resist composition stored at a temperature of 20 ° C. for 2 weeks and a resist composition stored at a temperature of 0 ° C. for 2 weeks), A resist pattern is formed under the same conditions. And when a resist pattern is formed with the same exposure amount, it can be said that the smaller the absolute value of the pattern size dimensional difference such as the line width of the resist pattern, the better the resist pattern stability with time.
- the temporal stability of the resist pattern may be referred to as sensitivity temporal stability or dimensional temporal stability.
- the resist composition containing an oxime sulfonate acid generator can improve the temporal stability of the resist pattern and can reduce development defects.
- the resist composition of the present invention comprises (A) a resin component whose alkali solubility is changed by the action of an acid, (B) an oxime sulfonate acid generator, and (D) an alkyl group having 5 to 12 carbon atoms. At least one amine compound, and (E) an organic acid, methyl-n-amyl ketone A resist composition dissolved in an organic solvent (C) containing, wherein the component (E) is a dibasic acid.
- the component (A) is a so-called base resin component, and the base resin component (A) means that it has a property of forming a resist film when a resist composition is coated on a substrate or the like. .
- a resin component such as ( ⁇ -lower alkyl) acrylic acid ester is used.
- ( ⁇ -lower alkyl) acrylic acid ester means one or both of acrylic acid esters and lower alkyl acrylic acid esters such as methacrylic acid esters. To do.
- the lower alkyl group as a substituent at the ⁇ -position of “( ⁇ -lower alkyl) acrylic acid ester” is an alkyl group having 1 to 5 carbon atoms, specifically, a methyl group or an ethyl group.
- (a-lower alkyl) acrylic ester force-derived structural unit means a structural unit formed by cleavage of the ethylenic double bond of (a-lower alkyl) acrylic ester.
- component (A) one or more alkali-soluble resins or alkali-soluble resins that are usually used as base resins for chemically amplified resists are used.
- the obtained rosin can be used.
- the former is a so-called negative type resist, and the latter is a so-called positive type resist composition.
- the resist composition of the present invention is preferably a positive type.
- a crosslinking agent is blended in the resist composition together with the (B) acid generator component.
- the forming acid acts, and cross-linking occurs between the (A) component and the cross-linking agent, resulting in alkali insolubility.
- the crosslinking agent for example, an amino crosslinking agent such as melamine, urea or glycoluril having a methylol group or an alkoxymethyl group is usually used.
- the component (A) is an alkali-insoluble one having a mild acid dissociable, dissolution inhibiting group.
- the acid is By dissociating the acid dissociable, dissolution inhibiting group, the component (A) becomes alkali-soluble.
- the positive type is preferred for the present invention.
- the component (A) is not particularly limited as long as it can be used as the base resin component of the resist composition as described above.
- the structural unit derived from lower alkyl) acrylate ester is 80 mol% or more, preferably 90 mol. % Or more (100 mol% is most preferred).
- the component (A) has an acid dissociable, dissolution inhibiting group (ex-lower alkyl) acrylic acid force-derived structural unit (al) (hereinafter referred to as (al) or (Al) unit)).
- a monomer unit having (al) units and having a plurality of other different functions such as the following structural units: It is preferable to compose by combination.
- the structural unit (al) is a structural unit from which an (ex lower alkyl) acrylate ester force having an acid dissociable, dissolution inhibiting group is also derived.
- the acid dissociable, dissolution inhibiting group in the structural unit (al) has an alkali dissolution inhibiting property that makes the entire (A) component insoluble before dissociation, and after dissociation, the entire (A) component becomes alkaline.
- alkali dissolution inhibiting property that makes the entire (A) component insoluble before dissociation, and after dissociation, the entire (A) component becomes alkaline.
- those proposed so far as the acid dissociable, dissolution inhibiting group of the base resin for chemically amplified resists can be used.
- a carboxyl group of ( ⁇ -lower alkyl) acrylic acid and a group forming a cyclic or chain tertiary alkyl ester, or a chain or cyclic alkoxyalkyl group are widely known.
- the “(meth) acrylic acid ester” means one or both of an acrylic acid ester and a methacrylic acid ester.
- structural unit (al) More specific examples of the structural unit (al) include structural units represented by the following general formulas (al-1) to (al-4).
- X represents an acid dissociable, dissolution inhibiting group containing an aliphatic branched or aliphatic cyclic group
- Y represents an aliphatic cyclic group, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group.
- Y ′ aliphatic cyclic group or an alkyl group or alkoxy group having 1 to 10 carbon atoms
- n represents 0 or an integer of 1 to 3
- m represents 0 or 1
- R 2 each independently represents a hydrogen atom or a lower alkyl group having 1 to 5 carbon atoms.
- aliphatic in the present invention is a relative concept with respect to aromatics, and is aromatic. It is defined to mean a group, compound, etc. that does not have.
- aliphatic cyclic group means that it is not aromatic !, a monocyclic group or a polycyclic group (alicyclic group).
- the “aliphatic cyclic group” The group is not limited to a group that also has carbon and hydrogen power (hydrocarbon group), but is preferably a hydrocarbon group. Further, the “hydrocarbon group” may be either saturated or unsaturated, but is usually preferably saturated. A polycyclic group (alicyclic group) is preferred.
- Such an aliphatic cyclic group include, for example, a monocycloalkane, bicycloalkane, tricycloalkane, which may or may not be substituted with a fluorine atom or a fluorinated alkyl group, Examples include groups in which one or more hydrogen atoms have been removed from a polycycloalkane such as tetracycloalkane.
- monocycloalkanes such as cyclopentane and cyclohexane
- groups obtained by removing one or more hydrogen atoms from polycycloalkanes such as adamantane, norbornane, isobornane, tricyclodecane, and tetracyclododecane. It is done.
- the structural unit (al) one kind may be used alone. A combination of the above may be used. Among them, the structural unit represented by the general formula (al-1) is preferred. Specifically, the structural unit force represented by the chemical formulas (al-1-1) to (al-1-40) is selected. It is more preferable to use one kind, and use at least one kind selected from chemical formulas (al—1—1) to (al—1—8) and (al—1—35) to (al—1-40). U, most preferred.
- the amount of the structural unit (al) is, (A) to the total structural units constituting the component more preferably preferably fixture 15-70 mole 0/0 forces 10 to 80 mole 0/0, Furthermore preferred arbitrariness from 20 to 50 mol 0/0.
- the lower limit value or more By setting it to the lower limit value or more, a pattern can be obtained when a resist composition is obtained. It is possible to balance with other structural units by setting the upper limit value or less.
- the structural unit (a2) is a structural unit derived from a lower alkyl) acrylate ester containing a latathone-containing monocyclic or polycyclic group.
- the rataton here means one ring containing the -o-c (o)-structure, and this is counted as the ring of one eye. Therefore, in the case of only a rataton ring, it is called a monocyclic group, and when it has another ring structure, it is called a polycyclic group regardless of the structure.
- any unit can be used without any particular limitation as long as it has both such a structure of lataton (one O 2 -C (O) —) and a cyclic group. .
- examples of the latatatone-containing monocyclic group include groups in which one petit-mouth rataton force hydrogen atom is removed.
- examples of the latathone-containing polycyclic group include groups in which bicycloalkane, tricycloalkane, and tetracycloalkane having a latathone ring have one hydrogen atom removed.
- a group obtained by removing one hydrogen atom from a latathone-containing tricycloalkane having the following structural formula is advantageous in that it is easily available industrially.
- examples of the structural unit (a2) include structural units represented by the following general formulas (a2-1) to (a2-5).
- R is a hydrogen atom or a lower alkyl group
- R ′ is a hydrogen atom, a lower alkyl group, or an alkoxy group having 1 to 5 carbon atoms
- m is an integer of 0 or 1.
- the lower alkyl group for R and R is the same as the lower alkyl group for R in the structural unit (al).
- R ′ is preferably a hydrogen atom in view of industrial availability. Of these, the structural unit represented by formula (a2-1) is preferred.
- one type may be used alone, or two or more types may be used in combination.
- Component (A) the proportion of the structural unit (a2), (A) to the total structural units constituting the component preferably from 5 to 60 mole 0/0 preferably fixture 10 to 50 mole 0/0 force, 25-45 mole 0/0 is not the most preferred.
- the effect of incorporating the structural unit (a2) can be sufficiently obtained, and by setting it to the upper limit value or less, it is possible to balance with other structural units.
- the structural unit (a3) is a structural unit derived from an (a-lower alkyl) acrylate ester group containing a polar group-containing aliphatic hydrocarbon group.
- the hydrophilicity of the resin component (A) is increased, the affinity with the developer during resist pattern formation is increased, and the alkali solubility in the exposed area is improved. And contributes to improvement of resolution.
- the polar group include a hydroxyl group and a cyan group, and a hydroxyl group is particularly preferable.
- aliphatic hydrocarbon group examples include a linear or branched hydrocarbon group (alkylene group) having 1 to 10 carbon atoms and a polycyclic aliphatic hydrocarbon group (polycyclic group).
- polycyclic group for example, many proposals have been made for resins for resist compositions for ArF excimer laser, and they can be appropriately selected and used.
- a structural unit containing a hydroxyl group, a cyano group or a carboxyl group-containing aliphatic polycyclic group and derived from an (a-lower alkyl) acrylate ester is more preferred.
- the polycyclic group include groups in which one or more hydrogen atoms have been removed from bicycloalkane, tricycloalkane, tetracycloalkane, and the like. Specific examples include groups in which one or more hydrogen atoms have been removed from a polycycloalkane such as adamantane, norbornane, isobornane, tricyclodecane or tetracyclododecane.
- polycyclic groups have been proposed in polymers (resin components) for resist compositions for ArF excimer lasers, and can be appropriately selected from those used.
- an adamantyl group, norbornyl group, and tetracyclododecanyl group are preferred industrially.
- the hydrocarbon group in the polar group-containing aliphatic hydrocarbon group is a linear or branched hydrocarbon group having 1 to 10 carbon atoms
- a —lower alkyl) alkyl is used. Hydroxyethyl ester power of lauric acid is preferred.
- the hydrocarbon group is a polycyclic group, it is represented by the following formulas (a3-1), (a3-2), (a3-3). Is preferred as a unit!
- t is an integer of 1 to 3.
- j is preferably 1.
- the hydroxyl group is preferably bonded to the 3rd position of the adamantyl group.
- k is preferably 1. These exist as a mixture of isomers (a mixture of compounds in which the cyano group is bonded to the 5th or 6th position of the norbornanyl group).
- 1 is preferably 1.
- t is preferably 1.
- one type may be used alone, or two or more types may be used in combination.
- the proportion of the structural unit (a3), relative to all the structural units that constitute the resin component (A), for the effect of the present invention is 5 to 50 mol 0/0 Preferred is 10 to 35 mol%, and more preferred is 15 to 30 mol%.
- the resin component (A) includes other structural units (a4) other than the structural units (al) to (a3) within a range not impairing the effects of the present invention, and Moyo.
- the structural unit (a4) is not classified into the above structural units (al) to (a3)! Other structural units are not particularly limited.
- KrF positive excimer A large number of known powers can be used as resist resins such as those for Thea (preferably for ArF excimer laser).
- the structural unit (a4) for example, a structural unit containing a non-acid-dissociable aliphatic polycyclic group and derived from a (lower alkyl) acrylate ester is preferable.
- the polycyclic group are the same as those exemplified in the case of the structural unit (al), and for ArF excimer laser, KrF positive excimer laser (preferably Ar F excimer).
- ArF excimer laser KrF positive excimer laser (preferably Ar F excimer).
- a number of conventionally known strengths can be used as the resin component of resist compositions such as for lasers.
- the polycyclic group may be substituted with a linear or branched alkyl group having 1 to 4 carbon atoms.
- the powerful structural unit (a4) is not an essential component, but when it is contained in the component (A), the structural unit (A) is added to the total of all the structural units constituting the component (A) (
- the content of a4) is preferably 1 to 30 mol%, preferably 5 to 20 mol%, most preferably 5 to 15 mol%.
- the component (A) is a monomer derived from each structural unit, for example, azobisisobutyl-tolyl
- chain transfer agent such as HS—CH 2 —CH 2 —CH 2 —C (CF) OH.
- the mass average molecular weight (Mw) of the component (A) is not particularly limited, but preferably 2000 to 30000. , 2000-20000 force S is preferred over ⁇ 5000-15000 force S The effect of the present invention is most preferred.
- the dispersity (MwZMn) is preferably 1.0 to 5.0 force S, more preferably 1.0 to 3.0.
- the component (A) may be used alone or in combination of two or more.
- the resist composition of the present invention it is essential to add an oxime sulfonate acid generator (B).
- B an oxime sulfonate acid generator
- the temporal stability of the resist pattern can be improved and development defects can be reduced.
- oxime sulfonate acid generator refers to the following general formula (B-1)
- R 21 represents an organic group
- R 22 represents a monovalent organic group or a cyano group
- Such oxime sulfonate acid generators are frequently used for chemically amplified resist compositions, and can be arbitrarily selected and used.
- the organic group for R 21 is preferably an alkyl group or an aryl group. These alkyl groups and aryl groups may have a substituent.
- alkyl groups and aryl groups preferably have 1 to 20 carbon atoms, and more preferably have 1 to 6 carbon atoms: LO preferably has 1 to 6 carbon atoms. Is most preferred.
- the alkyl group is preferably a partially or fully fluorinated alkyl group, and the aryl group is preferably a partially or fully fluorinated aryl group.
- R 22 is a cyan group or the same concept as R 21 .
- a partially or fully fluorinated alkyl group is a partially fluorinated alkyl group or Means a fully fluorinated alkyl group.
- a partially or fully fluorinated aryl group means a partially fluorinated aryl group or a fully fluorinated aryl group.
- R 21 is more preferably an alkyl group having 1 to 4 carbon atoms or a fluorinated alkyl group.
- R 22 is more preferably a cyan group, an alkyl group having 1 to 8 carbon atoms, a partial group or a fully fluorinated alkyl group.
- oxime sulfonate-based acid generator examples include ⁇ - ( ⁇ -toluenesulfo-luoximino) -benzyl cyanide, ⁇ - ( ⁇ -chlorobenzenesulfo-roximino) -benzil cyanide, ⁇ - (4-Nitrobenzenesulfo-luximino) -benzyl cyanide, ⁇ - (4-Nitro-2-trifluoromethylbenzenesulfo-luoximino) -benzyl cyanide, a- (Benzenesulfo-roximino) -4 -Black Benzyl Cyanide, a-(Benzenesulfo-Luximinomino)-2, 4-Dichlorobenzil Cyanide, ⁇ -(Benzenesulfo-Luximino Mino) -2, 6 -Dichlorobenzil Cyanide, ⁇ -(
- R 31 represents a partially or completely halogenated alkyl group or a halogenalkyl group.
- R 32 is an aryl group.
- R 33 is a partially or fully halogenated alkyl group or a halogenated alkyl group.
- R is a partially or fully halogenated alkyl group or a halogenalkyl group.
- R 35 is an aryl group.
- R 36 is a partially or fully halogenated alkyl group or a halogenated alkyl group.
- p is an integer of 2 to 3.
- R 31 is preferably a partially fluorinated carbon atom having 1 to 10 carbon atoms (more preferably 1 to 8 carbon atoms, most preferably 1 to 6 carbon atoms).
- the “partially fluorinated” means that the hydrogen atom of the alkyl group is 50% or more fluorinated, preferably 70% or more, more preferably 90% or more fluorinated, I like it. Of these, a partially fluorinated alkyl group is preferred.
- R 32 is preferably a phenyl group, a biphenylyl group, a fluorenyl group, a naphthyl group, an anthracyl group, a phenanthryl group, a heterocyclic group
- the substituted! May be an alkyl group or a halogenated alkyl group, preferably having 1 to 8 carbon atoms, more preferably 1 to 4 carbon atoms.
- the halogenated alkyl group is preferably a fluorinated alkyl group! /.
- R 33 is preferably a partially or fully fluorinated alkyl group having 1 to 10 carbon atoms (more preferably 1 to 8 carbon atoms, most preferably 1 to 6 carbon atoms) or 1 to C fluorine atoms.
- Alkyl group (more preferably 2 to 8 carbon atoms, most preferably 3 to 6 carbon atoms).
- the term “partially fluorinated” means that the hydrogen atom of the alkyl group is 50% or more fluorinated, preferably 70% or more, more preferably 90% or more. This is preferable because the strength of the acid generated is increased. Most preferably, it is a fluorinated alkyl group in which a hydrogen atom is substituted by 100% fluorine.
- R 34 is preferably a partially fluorinated alkyl group having 1 to 10 carbon atoms (more preferably 1 to 8 carbon atoms, most preferably 1 to 6 carbon atoms) or Carbon number 1 to:
- a fluorinated alkyl group of L0 (more preferably 1 to 8 carbon atoms, most preferably 1 to 6 carbon atoms).
- the “partially fluorinated” means that the hydrogen atom of the alkyl group is 50% or more fluorinated, preferably 70% or more, more preferably 90% or more fluorinated, I like it. Of these, a partially fluorinated alkyl group is preferred.
- R 35 is preferably a phenyl group, a biphenylyl group, a fluorenyl group, a naphthyl group, an anthracyl group, a phenanthryl group, a heteroaryl group, having 1 to It may be substituted with 10 alkyl groups, halogenated alkyl groups or alkoxy groups. Of these, the fluorenyl group is preferred! /.
- the substituted! May be an alkyl group or a halogenated alkyl group, preferably having 1 to 8 carbon atoms, more preferably 1 to 4 carbon atoms.
- the halogenated alkyl group is preferably a fluorinated alkyl group! /.
- R 36 is preferably a partially or fully fluorinated alkyl group having 1 to 10 carbon atoms (more preferably 1 to 8 carbon atoms, most preferably 1 to 6 carbon atoms) or 1 to C fluorine atoms Alkyl group (more preferably 2 to 8 carbon atoms, most preferably 3 to 6 carbon atoms).
- the term “partially fluorinated” means that the hydrogen atom of the alkyl group is 50% or more fluorinated, preferably 70% or more, more preferably 90% or more. This is preferable because the strength of the acid generated is increased. Most preferably, it is a fluorinated alkyl group in which a hydrogen atom is substituted by 100% fluorine.
- Said P is preferably 2.
- the blending amount of component (B) is 0.01 to 20 parts by weight, preferably 0.1 to: LO parts by weight, more preferably 1 to 8 parts by weight, with respect to 100 parts by weight of component (A). Is done.
- a pattern can be formed by using 0.01 parts by mass or more, and 20 parts by mass or less is more preferable from the viewpoint of reducing development defects.
- Component (B) can be used alone or in combination of two or more.
- other acid generators other than the component (B), for example, ododonium salts and sulfo-um salts, as necessary, within a range not impairing the effects of the present invention.
- Form salt acid generators bisalkyl or bisarylsulfol diazomethanes, diazomethane acid generators such as poly (bissulfol) diazomethanes, nitrobenzil sulfonate acid generators, imino sulfonate acids A generator or the like can be used in combination.
- the component (C) needs to contain methyl-n-amyl ketone (also known as 2-heptanone). Thereby, the temporal stability of the resist pattern can be improved, and development defects can be reduced.
- methyl-n-amyl ketone also known as 2-heptanone
- the content of methyl n amyl ketone in the component (C) is 10 to 60% by mass, preferably 20 to 50% by mass, and more preferably 30 to 45% by mass.
- the content is 10 to 60% by mass, preferably 20 to 50% by mass, and more preferably 30 to 45% by mass.
- the component (C) may further contain one or more selected from propylene glycol monomethyl ether acetate (PGMEA), propylene glycol monomethyl ether (PGME), and lactic acid ethyl (EL) force. preferable. These are methyl-n-a It is a solvent having a relatively high polarity compared to milketone. By these actions, the diffetat after development can be reduced as described above. In particular, the combination with the (A) component having a relatively high polarity and a structural unit such as the (a2) unit and the (a3) unit exhibits a great effect.
- PGMEA propylene glycol monomethyl ether acetate
- PGME propylene glycol monomethyl ether
- EL lactic acid ethyl
- propylene glycol monomethyl ether acetate is preferred.
- the blending amount of these relatively polar solvents is 40 to 90% by mass, preferably 50 to 80% by mass, and more preferably 55 to 70% by mass in the component (C).
- the component (C) one or more arbitrary arbitrary organic solvents known as solvents for resist compositions can be arbitrarily blended within a range not impairing the effects of the present invention.
- the amount of the component (C) used is not particularly limited, and is a concentration that can be applied to a support such as a substrate, and is appropriately set according to the coating film thickness. It is used so that the partial concentration is in the range of 2 to 20% by mass, preferably 5 to 15% by mass.
- the resist composition of the present invention comprises an amine compound (D) (hereinafter referred to as component (D)) having at least one alkyl group having 5 to 12 carbon atoms. It is necessary to mix
- Amines particularly secondary lower aliphatic amines, are preferably tertiary lower aliphatic amines. .
- component (D) examples include tri-n-pentylamine, tri-n-heptylamine, tri-n-octylamine, tri-n-nonylamine, tri-n-decylamine, tri-n-dodecylamine, tri- — N-de-ramine, di-n-pentylamine, di-n-heptylamine, di-n-octylamine, di-n-norlamin, di-n-decylamine, di-n-do Examples include alkylamines such as decylamine.
- trialkylamines having at least one alkyl group having 5 to 12 carbon atoms such as tri-n-octylamine and tri-n-dodecylamine are particularly preferable. These can be used alone or in combination of two or more.
- Component (D) is usually 0.01 to 5.0 parts by weight, preferably 0.1 to 3 parts by weight, more preferably 0.2 to 1.0 parts by weight, per 100 parts by weight of component (A). It is used in the range.
- the resist composition of the present invention prevents sensitivity deterioration due to the blending with the component (D), and also reduces diffetats, resist pattern shape, and resist pattern stability over time. It is necessary to add a dibasic acid as an organic acid for the purpose of improvement.
- the dibasic acid the pKa (acid dissociation constant) at the first stage is preferably 4 or less because the effect of the present invention is excellent.
- dibasic acid for example, malonic acid, maleic acid, succinic acid, salicylic acid and the like are suitable.
- the component (E) is preferably used at a ratio of 0.01-5. Omol with respect to 1 mole of the component (D). 0.1-3. Omol is more preferable 0.5. ⁇ 2.5 mol is most preferred. By setting the content in the above range, the resist pattern can be improved in stability over time and development defects can be reduced.
- the positive resist composition of the present invention there are further additives that are miscible as desired, for example, an additional grease for improving the performance of the resist film, and a surfactant for improving the coating property.
- an additional grease for improving the performance of the resist film for example, a surfactant for improving the coating property.
- a dissolution inhibitor, a plasticizer, a stabilizer, a colorant, an antihalation agent, a dye, and the like can be appropriately added and contained.
- the resist pattern forming method of the present invention can be performed, for example, as follows.
- a positive resist composition will be described. That is, first, a positive resist yarn and a composition are applied onto a substrate such as a silicon wafer with a spin coater and the like, and a pre-beta for 40 to 120 seconds, preferably 60, under a temperature condition of 80 to 150 ° C. Apply for ⁇ 90 seconds to form a resist film.
- ArF excimer laser light is selectively exposed through a desired mask pattern using, for example, an ArF exposure apparatus, and then subjected to PEB (post-exposure heating) of 40 to 120 at a temperature of 80 to 150 ° C.
- PEB post-exposure heating
- Seconds preferably 60 to 90 seconds.
- This is then developed using an alkaline developer such as an aqueous solution of 0.1 to: LO mass% tetramethylammonium hydroxide. In this way, a resist pattern faithful to the mask pattern can be obtained.
- 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, ArF excimer laser, KrF excimer laser, F excimer laser, EUV (extreme ultraviolet), VUV (vacuum ultraviolet), EB (electron beam),
- the present invention is effective for an ArF excimer laser.
- the resist composition of the present invention is preferably applied to a substrate having a nitrogen-containing layer. That is, the resist composition of the present invention is suitable for a substrate having a nitrogen-containing layer. When a substrate having a nitrogen-containing layer is used, the tailing phenomenon is particularly likely to occur in the resist pattern in contact with the nitrogen-containing layer, but this can be reduced by applying the present invention.
- the nitrogen-containing layer is usually provided as an insulating layer, a metal layer or the like on the substrate according to the purpose of use, and contains nitrogen.
- the insulating layer include silicon nitride (SiN), tetratetranitride (SiN), and the like.
- metal layers include titanium nitride (TiN).
- the nitrogen-containing layer is formed by vapor deposition or the like on a substrate such as a silicon substrate.
- a substrate having such a nitrogen-containing layer is called, for example, a “nitrogen-containing substrate”.
- the resist composition of the present invention is provided with an antireflection film [an organic antireflection film (an antireflection film made of an organic compound) or an inorganic antireflection film (an antireflection film made of an inorganic compound)].
- an organic antireflection film is particularly preferred.
- the tailing of the resist pattern in contact with the antireflection film is particularly important. This phenomenon is likely to occur, but this can be reduced by applying the present invention.
- organic antireflection film examples include AR46 (product name: manufactured by Shipley Co., Ltd.). Especially, when AR46 is used, tailing phenomenon tends to occur, but this can be suppressed by applying the present invention. Monkey.
- the thermal flow process is performed after the resist pattern is formed as described above.
- the thermal flow process can be performed, for example, as follows. That is, the resist pattern after image processing is softened by heating at least once, preferably 2 to 3 times, and the resist is allowed to flow, whereby the resist pattern pattern size (for example, the hole pattern hole diameter is line and space). (Space width) is reduced (narrower) than the size immediately after development.
- a suitable heating temperature depends on the composition of the resist composition and is not particularly limited as long as it is not lower than the soft spot of the resist pattern, but is preferably 80 to 180 ° C, more preferably 110 to 150. Within the range of ° C. By setting the heating temperature within this range, there are advantages such as easy control of the no-turn size.
- the suitable heating time is not particularly limited as long as it is within a range in which a desired pattern size that does not hinder the throughput can be obtained.
- it is preferably 10 to 300 seconds, more preferably about 30 to 180 seconds.
- the resist composition of the present invention can suppress the precipitation of the component (B) even when the thermal flow process is performed, and the resist composition can be gasified even when heated in the thermal flow process. Deterioration is difficult to occur.
- the use of an oxime sulfonate-based acid generator makes it possible to reduce the problem of such bubbles. Therefore, the resist composition of the present invention is also suitable for a thermal flow process.
- a positive resist composition having the following composition was produced.
- Methyl-n-amyl ketone PGMEA mixed at a mass ratio of 4: 6.
- the solid content of the strike composition was adjusted to 10% by mass.
- Table 1 shows the types and amounts of components (D) and (E). The amount of component (E) is shown in moles per mole of component (D).
- the prepared resist compositions of Examples 1 to 4 and Comparative Examples 1 to 6 were stored in a frozen state (20 ° C.) or 40 ° C. for 2 weeks, respectively.
- resist compositions of Examples 1 to 4 and Comparative Examples 1 to 6 For the resist composition (R1) stored frozen for 2 weeks and the resist composition (R2) stored at 40 ° C for 2 weeks, respectively, an organic antireflection coating material (8 Product name: AR 46) was applied and baked at 225 ° C for 60 seconds to form an antireflection film with a film thickness of 29 nm.
- an organic antireflection coating material (8 Product name: AR 46) was applied and baked at 225 ° C for 60 seconds to form an antireflection film with a film thickness of 29 nm.
- the positive resist composition obtained above is uniformly applied using a spinner, pre-betaned on a hot plate at 120 ° C. for 60 seconds, and dried to form a resist having a thickness of 240 nm. A layer was formed.
- an ArF exposure apparatus wavelength 193 nm
- selective exposure was performed through a mask.
- CZH pattern the resist pattern of the contact hole (1: 1) was formed by swinging and drying.
- the dimensional difference of the resist pattern was calculated by the following formula. The smaller the absolute value of the resist pattern dimensional difference, the better the resist composition is.
- the resist compositions of Examples 1 to 4 and Comparative Examples 1 to 6 which were stored frozen for 1 week were prepared on an 8-inch silicon wafer with an organic antireflection coating material (trade name: AR46, manufactured by Shipley Co., Ltd.). Was applied and baked at 225 ° C for 60 seconds to form an antireflection film having a thickness of 29 nm to obtain a substrate.
- an organic antireflection coating material trade name: AR46, manufactured by Shipley Co., Ltd.
- the positive resist composition obtained above is uniformly applied using a spinner, pre-betaned on a hot plate at 120 ° C. for 60 seconds, and dried to form a resist having a thickness of 240 nm. A layer was formed.
- an ArF exposure apparatus wavelength 193 nm
- selective exposure was performed through a mask.
- PEB treatment was performed at 120 ° C for 60 seconds, followed by paddle development with an aqueous solution of 2.38 mass% tetramethylammonium hydroxide at 23 ° C for 60 seconds, and then rinsed with pure water for 30 seconds. Then, by shaking off and drying, a 130 nm line and space (1: 1) resist pattern (hereinafter referred to as LZS pattern) was formed.
- LZS pattern 130 nm line and space (1: 1) resist pattern
- Table made by KLA Tencor Measurements were made using a surface defect observation device KLA2132 (product name) to evaluate the number of defects in the wafer. Three wafers were used for the test, and the average value was obtained.
- the resist compositions of Examples 1 to 4 had a dimensional difference of less than 7 nm and very few development defects of 60 or less.
- Comparative Examples 1 and 6 although development defects could be reduced, the dimensional differences showed very large values of 64.57 nm and 57.53 nm, respectively.
- Comparative Examples 2, 3, and 5 the dimensional difference was small. The development defects could not be reduced.
- Comparative Example 4 both dimensional differences and development defects could not be reduced.
- the temporal stability of the resist pattern can be improved and development defects can be reduced.
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- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
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- Materials For Photolithography (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
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Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/575,062 US7582406B2 (en) | 2004-09-13 | 2005-08-19 | Resist composition and method for forming resist pattern |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004-266055 | 2004-09-13 | ||
| JP2004266055 | 2004-09-13 | ||
| JP2005226487A JP4708113B2 (ja) | 2004-09-13 | 2005-08-04 | レジスト組成物、レジストパターン形成方法 |
| JP2005-226487 | 2005-08-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006030604A1 true WO2006030604A1 (ja) | 2006-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/015165 Ceased WO2006030604A1 (ja) | 2004-09-13 | 2005-08-19 | レジスト組成物、レジストパターン形成方法 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7582406B2 (ja) |
| JP (1) | JP4708113B2 (ja) |
| KR (1) | KR100877498B1 (ja) |
| TW (1) | TWI303747B (ja) |
| WO (1) | WO2006030604A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010270260A (ja) * | 2009-05-22 | 2010-12-02 | Maruzen Petrochem Co Ltd | フォトレジスト用共重合体ならびにその製造方法および保存方法 |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4801550B2 (ja) | 2006-09-26 | 2011-10-26 | 富士通株式会社 | レジスト組成物、レジストパターンの形成方法、及び半導体装置の製造方法 |
| TWI550338B (zh) * | 2010-08-30 | 2016-09-21 | 富士軟片股份有限公司 | 感光性樹脂組成物、肟基磺酸酯化合物、硬化膜之形成方法、硬化膜、有機el顯示裝置、及液晶顯示裝置 |
| JP5846888B2 (ja) * | 2011-12-14 | 2016-01-20 | 東京応化工業株式会社 | レジスト組成物、レジストパターン形成方法 |
| JP6353681B2 (ja) * | 2014-03-31 | 2018-07-04 | 富士フイルム株式会社 | 感活性光線性又は感放射線性樹脂組成物の製造方法、感活性光線性又は感放射線性膜の製造方法、感活性光線性又は感放射線性膜を備えたマスクブランクスの製造方法、フォトマスクの製造方法、パターン形成方法及び電子デバイスの製造方法 |
| EP3244262A4 (en) * | 2015-01-08 | 2018-07-04 | JSR Corporation | Radiation-sensitive composition and pattern forming method |
| JP2024520263A (ja) | 2021-05-28 | 2024-05-24 | メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | 厚膜レジスト組成物およびそれを用いたレジスト膜の製造方法 |
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| JPH1090901A (ja) * | 1996-07-24 | 1998-04-10 | Tokyo Ohka Kogyo Co Ltd | 化学増幅型レジスト組成物及びそれに用いる酸発生剤 |
| JPH10171109A (ja) * | 1996-12-10 | 1998-06-26 | Tokyo Ohka Kogyo Co Ltd | ネガ型化学増幅型レジスト組成物 |
| JPH1195434A (ja) * | 1997-09-16 | 1999-04-09 | Sumitomo Chem Co Ltd | ポジ型フォトレジスト組成物 |
| JP2000347392A (ja) * | 1999-06-02 | 2000-12-15 | Sumitomo Chem Co Ltd | 化学増幅ネガ型レジスト組成物 |
| JP2002072480A (ja) * | 2000-08-31 | 2002-03-12 | Tokyo Ohka Kogyo Co Ltd | ポジ型レジスト組成物及びそれを用いたレジストパターン形成方法 |
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| US6004720A (en) | 1993-12-28 | 1999-12-21 | Fujitsu Limited | Radiation sensitive material and method for forming pattern |
| JP2004333548A (ja) * | 2003-04-30 | 2004-11-25 | Tokyo Ohka Kogyo Co Ltd | ポジ型ホトレジスト組成物およびレジストパターン形成方法 |
| JP4494061B2 (ja) * | 2004-03-30 | 2010-06-30 | 東京応化工業株式会社 | ポジ型レジスト組成物 |
| JP4279204B2 (ja) * | 2004-05-31 | 2009-06-17 | 東京応化工業株式会社 | ポジ型レジスト組成物およびこれに用いられる化合物 |
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2005
- 2005-08-04 JP JP2005226487A patent/JP4708113B2/ja not_active Expired - Fee Related
- 2005-08-19 KR KR1020077005300A patent/KR100877498B1/ko not_active Expired - Fee Related
- 2005-08-19 WO PCT/JP2005/015165 patent/WO2006030604A1/ja not_active Ceased
- 2005-08-19 US US11/575,062 patent/US7582406B2/en not_active Expired - Lifetime
- 2005-08-24 TW TW094128989A patent/TWI303747B/zh not_active IP Right Cessation
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| JPH1090901A (ja) * | 1996-07-24 | 1998-04-10 | Tokyo Ohka Kogyo Co Ltd | 化学増幅型レジスト組成物及びそれに用いる酸発生剤 |
| JPH10171109A (ja) * | 1996-12-10 | 1998-06-26 | Tokyo Ohka Kogyo Co Ltd | ネガ型化学増幅型レジスト組成物 |
| JPH1195434A (ja) * | 1997-09-16 | 1999-04-09 | Sumitomo Chem Co Ltd | ポジ型フォトレジスト組成物 |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW200617594A (en) | 2006-06-01 |
| US7582406B2 (en) | 2009-09-01 |
| JP4708113B2 (ja) | 2011-06-22 |
| US20090004598A1 (en) | 2009-01-01 |
| KR20070040836A (ko) | 2007-04-17 |
| TWI303747B (en) | 2008-12-01 |
| JP2006106693A (ja) | 2006-04-20 |
| KR100877498B1 (ko) | 2009-01-07 |
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