WO2014038869A1 - 실리콘 옥사이드의 나노 패턴 형성 방법, 금속 나노 패턴의 형성 방법 및 이를 이용한 정보저장용 자기 기록 매체 - Google Patents
실리콘 옥사이드의 나노 패턴 형성 방법, 금속 나노 패턴의 형성 방법 및 이를 이용한 정보저장용 자기 기록 매체 Download PDFInfo
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- WO2014038869A1 WO2014038869A1 PCT/KR2013/008027 KR2013008027W WO2014038869A1 WO 2014038869 A1 WO2014038869 A1 WO 2014038869A1 KR 2013008027 W KR2013008027 W KR 2013008027W WO 2014038869 A1 WO2014038869 A1 WO 2014038869A1
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- WO
- WIPO (PCT)
- Prior art keywords
- nano
- block copolymer
- thin film
- silicon oxide
- forming
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 160
- 229910052814 silicon oxide Inorganic materials 0.000 title claims abstract description 118
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 95
- 239000002184 metal Substances 0.000 title claims abstract description 95
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 36
- 238000003860 storage Methods 0.000 title claims abstract description 16
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- 239000010409 thin film Substances 0.000 claims abstract description 145
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- 239000000758 substrate Substances 0.000 claims abstract description 25
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- 238000001020 plasma etching Methods 0.000 claims abstract description 12
- 125000004432 carbon atom Chemical group C* 0.000 claims description 24
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- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 20
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 9
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 3
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- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 10
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- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 6
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- 238000004630 atomic force microscopy Methods 0.000 description 6
- 239000004205 dimethyl polysiloxane Substances 0.000 description 6
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- 150000004706 metal oxides Chemical class 0.000 description 6
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- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 239000012703 sol-gel precursor Substances 0.000 description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
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- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 4
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/855—Coating only part of a support with a magnetic layer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/743—Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks
- G11B5/746—Bit Patterned record carriers, wherein each magnetic isolated data island corresponds to a bit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82B—NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
- B82B1/00—Nanostructures formed by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
- B82B1/001—Devices without movable or flexible elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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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
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8404—Processes or apparatus specially adapted for manufacturing record carriers manufacturing base layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/851—Coating a support with a magnetic layer by sputtering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C1/00—Manufacture or treatment of devices or systems in or on a substrate
- B81C1/00388—Etch mask forming
- B81C1/00396—Mask characterised by its composition, e.g. multilayer masks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C2201/00—Manufacture or treatment of microstructural devices or systems
- B81C2201/01—Manufacture or treatment of microstructural devices or systems in or on a substrate
- B81C2201/0101—Shaping material; Structuring the bulk substrate or layers on the substrate; Film patterning
- B81C2201/0147—Film patterning
- B81C2201/0149—Forming nanoscale microstructures using auto-arranging or self-assembling material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C2201/00—Manufacture or treatment of microstructural devices or systems
- B81C2201/01—Manufacture or treatment of microstructural devices or systems in or on a substrate
- B81C2201/0198—Manufacture or treatment of microstructural devices or systems in or on a substrate for making a masking layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2438/00—Living radical polymerisation
- C08F2438/03—Use of a di- or tri-thiocarbonylthio compound, e.g. di- or tri-thioester, di- or tri-thiocarbamate, or a xanthate as chain transfer agent, e.g . Reversible Addition Fragmentation chain Transfer [RAFT] or Macromolecular Design via Interchange of Xanthates [MADIX]
Definitions
- the present invention relates to a method for forming a nano pattern of silicon oxide, a method for forming a metal nanopattern, and a magnetic recording medium for information storage using the same. More specifically, the present invention can easily form a nano-pattern of the nano dot or nano-hole type, and the nano-silicon oxide of the metal oxide pattern that can be suitably applied to the magnetic recording medium for the next generation information storage, etc.
- the block copolymer lithography can overcome the technical limitations of the existing photolithography, for example, the limit of the pattern size that can be formed, and can be easily and cost-effectively through the self-assembly process of the block copolymer. Nanostructures or nanopatterns can be formed.
- the material structure of the block copolymer can be a polymer material of a series similar to the photoresist currently used, it can be more easily applied to the semiconductor production process currently applied.
- block copolymers are polymers in which polymer blocks having different chemical structures are connected through covalent bonds, and according to the composition, the length of chains, and the coefficient of mutual gravitation (Flory-Huggins parameter) between the blocks constituting the block copolymer.
- Flory-Huggins parameter the coefficient of mutual gravitation between the blocks constituting the block copolymer.
- nanostructures ranging from basic structures such as sphere ⁇ cylinders and lamellae to complex three-dimensional structures such as gyroid and hexagonal perforated lamellae (HPL) structures.
- the size of the nanostructures can be varied according to the chemical structure, the composition ratio of the block, or the molecular weight of the nanoparticles, the possibility of application of a non-destructive process, and the easy preparation of molds for the production of high density arrays of nanoscale patterns.
- block copolymer lithography in particular the fine phase of block copolymers.
- block copolymers having a cylindrical structure the block copolymer film or the lithography using the same is most commonly used due to various possibilities of flash memory, storage media, optical elements or electronic circuits. It is very important to easily adjust the orientation and arrangement of the nanostructure to the desired shape.
- silicon oxide nano dots or metal nano dots have been spotlighted as nano-patterns of materials applicable to fields such as optical devices, optical waveguides, chemical sensors, and magnetic storage media. Therefore, in recent years, studies are being actively conducted to form such nanodot-shaped nanopatterns using cylinder nanostructures of block copolymers.
- a sol-gel precursor such as poly (styrene-6-ethylene oxide) (PS-b-PEO)
- PS-b-PEO poly (styrene-6-ethylene oxide)
- silicon oxide is selectively reacted with the hydrophilic block PEO and calcined.
- a method of implementing a nanostructure of silicon oxide has been proposed.
- a vertically oriented poly (styrene-methyl methacrylate) (PS-3PMMA) thin film was formed as a template, and after irradiation with ultraviolet rays to decompose and remove PMMA, tetraethoxysilane was removed.
- PMMA there has also been proposed a method of implementing nanostructures of silicon oxide by treatment with tetraethoxysilane on the PMMA block on top of the PMMA block or without UV irradiation.
- a thin film such as poly (styrene-b-dimethylsiloxane) (PS-fe-PDMS) or poly (styrene-6-4-vinylpyridine) (PS-6-P4VP) is formed, and this is formed by ultraviolet / ozone light and the like.
- PS-fe-PDMS poly (styrene-6-4-vinylpyridine)
- PS-6-P4VP poly (styrene-6-4-vinylpyridine)
- nano dots of silicon oxide or the like by treating with or filling the pores in the thin film with PDMS and the like has been proposed.
- the present invention provides a method of forming a silicon oxide nano pattern that can easily form a nano pattern in the form of nano dots or nano holes.
- the present invention provides a method of forming a metal nanopattern using the silicon oxide nanopattern.
- the present invention also provides a magnetic recording medium for next generation information storage using the metal nano pattern and the like.
- the present invention on the silicon oxide on the substrate, of the formula Forming a thin film of a block copolymer including a hard segment including a repeating unit and a soft segment including a (meth) acrylate-based repeating unit of Formula 2; Selectively removing the soft segment from the thin film of block copolymer; And forming a nano dot or nano hole pattern of silicon oxide by semi-atom ion etching of silicon oxide using the block copolymer thin film having the soft segment removed thereon as a mask, to form a silicon oxide nano pattern comprising:
- n is an integer of 5 to 600 and R is hydrogen or
- Y is alkylene having 1 to 10 carbon atoms
- ⁇ is arylene having 6 to 20 carbon atoms
- R ′′ is a linear or branched hydrocarbon having 10 to 20 carbon atoms, or a linear or branched perfluorohydrocarbon having 10 to 20 carbon atoms.
- the present invention also provides a step of forming a thin film of a block copolymer comprising a hard segment including a repeating unit of Formula 1 and a soft segment including the (meth) acrylate-based repeating unit of Formula 2 on a substrate. ; Selectively removing the soft segment from the thin film of block copolymer; And depositing a metal on the block copolymer thin film from which the soft segment has been removed.
- the present invention also provides a magnetic recording medium for storing information comprising a metal nanopattern formed by the above-described method of forming a metal nanopattern.
- a method of forming a silicon oxide and a metal nanopattern according to a specific embodiment of the present invention, and a magnetic recording medium for storing next generation information using the same will be described in detail.
- the silicon oxide on the substrate of the block copolymer comprising a hard segment comprising a repeating unit of the formula (1) and a soft segment comprising a (meth) acrylate-based repeating unit of the formula (2)
- Forming a thin film Selectively removing the soft segment from the thin film of block copolymer; And forming a nano dot or nano hole pattern of silicon oxide by reactive ion etching silicon oxide using a mask of the block copolymer thin film from which the soft segment has been removed, thereby providing a method of forming a silicon oxime nano pattern.
- n is an integer of 5 to 600, R is hydrogen or
- ⁇ is alkylene of 1 to 10 carbon atoms
- ⁇ is arylene of 6 to 20 carbon atoms
- R ′′ is a linear or branched hydrocarbon of 10 to 20 carbon atoms, or a linear or branched perfluorohydrocarbon of 10 to 20 carbon atoms Carbon (perfluorohydrocarbon), in Formula 2, m is an integer of 30 to 1000, Rr hydrogen or methyl, F is 1 to 20 alkyl.
- the present inventors are novel by the method of sequentially polymerizing a predetermined (meth) acrylate type monomer and an acrylamide type monomer (The monomer of Formula 3 and 4 mentioned below; same as below.) Through RAFT polymerization method known as a living radical polymerization method.
- the block copolymer of the compound was synthesized and its properties were identified and patented with Korean Patent Application No. 2012-0027392.
- the soft segment is self-aligned in a cylindrical pattern on a hard segment while forming a thin film of the block copolymer by a solvent aging method or a heat treatment method, and then the soft segment is formed. It is possible to form nano dots or nano hole patterns of silicon oxide in a very simple manner by selectively removing and etching the underlying silicon oxide using a thin film of block copolymer in which hard segments remain.
- the nanopattern forming method of one embodiment can be suitably applied to a micropattern forming process of an electronic device including a next-generation semiconductor device requiring the formation of a nano dot or a nano hole pattern, or the manufacture of a nano biosensor.
- the polymer block constituting the hard segment may be obtained by polymerizing a predetermined acrylamide monomer described later.
- acrylamide-based monomers may cause intramolecular or intermolecular hydrogen bonds with arylene groups causing interaction of non-polar aliphatic hydrocarbons (more than 10 carbon atoms) that can be self-assembled with ⁇ - ⁇ orbitals.
- Amide groups have a chemical structure introduced. Through the self-assembly behavior of aliphatic long-chain hydrocarbons, the ⁇ - ⁇ interaction of arylene groups, and the intact hydrogen bonding of amide groups, the monomers can form a regular conformation in the solid state. have.
- each monomer molecule may be regularly arranged in the polymer chain. More specifically, through the polymerization reaction, well-oriented monomer molecules may be combined to form one polymer chain (for example, one and a polymer building block), and the polymer building blocks may be assembled to form a regularly arranged polymer. Can be formed. Therefore, due to the orderly arrangement of polymer building blocks in such polymers, the polymer blocks of the hard segment (ie, repeating units of Formula 1) have a self-assembled talk that defines a number of spaces of uniform size after polymerization. Can be represented.
- the polymer blocks of the hard segment ie, repeating units of Formula 1
- the block copolymer is prepared by polymerizing the acrylamide monomer in a state in which a polymer block forming a soft segment is formed by polymerization of the (meth) acrylate monomer.
- a plurality of spaces are defined by the self-assembly of the hard segment and the monomers constituting the acrylamide-based monomer, and polymer blocks of the hard segment are regularly and spontaneously arranged at the ends of the soft segment.
- the above-described block copolymer may be formed.
- These hard segments The regular arrangement of the polymer blocks appears to be due to the self-assembly behavior of the crystalline hard segments and the microphase separation with amorphous soft segments.
- the soft segment including the repeating unit of the formula (2) is a cylinder on the hard segment including the repeating unit of the formula (1).
- Nanostructures or nanopatterns regularly arranged in shape or the like may be expressed.
- the block copolymer and its thin film are nano-arranged in the cylinder form regularly arranged in a square array (hexagonal array), etc. It can have a structure or a nano pattern. Expression of such regular nanostructures or nanopatterns can be confirmed through atomic force microscopy (AFM) or scanning electron microscopy (SEM) analysis of thin films of the block copolymer.
- AFM atomic force microscopy
- SEM scanning electron microscopy
- the silicon oxide in the lower portion is etched using the thin film of the block copolymer in which the remaining hard segments remain.
- nano dots or nano hole patterns of silicon oxide can be formed without complicated subsequent steps such as the use of TEOS sol-gel precursors or PDMS coating processes.
- the process conditions for removing the soft segment, the type of the treatment material, or whether the substance is adsorbed such as metal oxide on the thin film from which the soft segment is removed Depending on the type of material, the concentration or processing time, or the conditions such as the reactive ion etching process for patterning silicon oxide or the number of times of progress, the desired pattern form (nano dot, nano hole, or the form in which they exist together) is easily obtained. It was confirmed that the nano-pattern can be formed under the control.
- the nano-hole or the nano-hole on the large-area substrate can be easily controlled in the form of obtaining the nano-pattern of silicon oxide (nano dot, nano hole, or a form in which they exist together).
- the dot pattern nanopattern can be formed suitably.
- it will be described in more detail with respect to the method of forming the silicon oxide nano pattern according to an embodiment of the invention described above. More specifically, first, the block copolymer used in the method of the embodiment will be described, and the nanopattern forming method using the same will be described in detail for each step of the process.
- the block copolymer used in the method of one embodiment includes a hard segment comprising a repeating unit of formula (1).
- Z may be any arylene having 6 to 20 carbon atoms. Examples of such arylene include ortho-phenylene,
- R ′′ may be a linear or branched aliphatic hydrocarbon substituted at the ortho, meta or para position of the aromatic ring included in Z, the hydrocarbon is 10 or more carbon atoms, more specifically 10 to 20 carbon atoms
- the hydrocarbon of R ′′ may be substituted with fluorine
- R ′′ may be linear or branched perfluorohydrocarbon having 10 to 20 carbon atoms.
- the repeating unit of Formula 1 and the monomer of Formula 4 to be described later have such a long-chain hydrocarbon and arylene, the self-assembly characteristics of the hard segment or monomer may be prominent, and as a result, it is determined by the fine phase separation phenomenon.
- the amorphous soft segment may form a cylindrical nanostructure or nano pattern regularly arranged in a square shape or a hexagonal shape on the hard segment.
- the hard segment may include only one type of repeating unit belonging to Formula 1, but may include a repeating unit in the form of a copolymer, including two or more repeating units belonging to the category of Formula 1.
- the block copolymer used in the method of the embodiment includes a soft segment together with the above-mentioned hard segment, the soft segment may include a (meth) acrylate-based repeating unit of the formula (2).
- Such (meth) acrylate-based repeating units are conventional acrylate- or methacrylate-based monomers such as methyl acrylate (methyl acrylate;
- the soft segment may include only one type of repeating unit derived from a single acrylate-based or methacrylate-based monomer, but two or more kinds of acrylate-based or The repeating unit of the copolymer form derived from the methacrylate type monomer, ie, 2 or more types of repeating units may be included.
- the block copolymer may have a number average molecular weight of about 5000 to 200000, or a number average molecular weight of about 10000 to 100000.
- the soft segment included in the block copolymer may have a number average molecular weight of about 3000 to 100,000, or a number average molecular weight of about 5000 to 50000.
- the block copolymer of a hard segment may be included in about 40 to 90 parts by weight 0/0, or from about 50 to 80 weight 0/0, or 60 to 75 weight 0 /.
- Soft segment from about 60 to 10 increase 0 /., Or about 50 to 20% by weight, black may be included in the 40 to 25% by weight.
- the block copolymer meets these molecular weight characteristics and the content range of each segment, the block copolymer is treated by solvent aging or heat treatment to form a thin film of a block copolymer having a regular nanostructure or nano pattern. It can form suitably.
- a nano dot or a nano hole pattern of silicon oxide can be effectively formed using the thin film as a mask.
- the hard segment and the block copolymer including the hard segment may have a melting point (T m ) of about 200 to 30 CTC, or a melting point of about 220 to 280 ° C.
- the soft segment may have a glass transition temperature (Tg) of about 40 to 130 ° C, or a glass transition temperature of about 95 to 120 ° C.
- T m melting point
- Tg glass transition temperature
- the hard and soft segments have a melting point and a glass transition temperature range in this range, a thin film of a block copolymer in which a regular nanostructure or nanopattern is expressed can be more preferably formed.
- the above-described block copolymer is RAFT polymerization step of semi-ungmul containing at least one (meth) acrylate monomer of the formula (3) in the presence of a radical initiator and a RAFT reagent; And in the presence of the polymerization product, RAFT polymerization of a reactant comprising at least one monomer of 4 may be prepared by a process comprising:
- RAFT polymerization of the (meth) acrylate monomer of Formula 3 to form a polymer block to form a soft segment and in the presence of RAFT polymerization of the acrylamide monomer of Formula 4 to form a polymer block to form a hard segment
- the block copolymer used in the method of one embodiment can be easily produced. That is, when the first RAFT polymerization step is performed, a polymer in which the RAFT reagent is bound to both terminals thereof may be prepared while the monomer of Formula 3 is polymerized.
- the monomer of Formula 4 may be polymerized and bonded to the end of the macroinitiator, and as a result, the hard segment described above. And It is one that can be produced a block copolymer comprising a soft segment.
- the block copolymer and the thin film including the same may be used in the form of a cylindrical polymer due to the self-assembly of the hard segment polymerized with the monomer of Formula 4, and the like. It can represent an arrayed characteristic. Therefore, using the block copolymer, a thin film of a block copolymer in which the cylinder form is regularly arranged in a square shape or a hexagonal shape is manufactured, and by using the same according to the nano-pattern forming method of the embodiment of the silicon oxide Nano dots or nano hole patterns and the like can be formed.
- any of the well-known (meth) acrylate monomers may be used as the monomer of Formula 3, and specific examples thereof include methyl acrylate (MA) and methyl methacrylate (methyl). methacrylate; MMA), ethyl acrylate (EA), ethyl methacrylate (EMA), n-butyl acrylate (BA) or n-octyl acrylate (n- octyl acrylate; BA), and the like. Of course, two or more kinds of monomers selected from them may be used.
- the monomer of Formula 4 may be any monomer that striking the structure of Formula 4, specific examples thereof are paradodecylphenyl acrylamide [N- (p-dodecyl) phenyl acrylamide, DOPAM], para Tetradecylphenylacrylamide [N- (p-tetradecyl) phenyl acrylamide, TEPAM], paranuxadecylphenylacrylamide [N- (p-hexadecyl) phenyl acrylamide, HEPAM), paradodecylnaphthylacrylamide [N- ( p-dodecyl) naphthyl acrylamide, DONAM], paratetradecylnaphthyl acrylamide [N- (p-tetradecyl) napht yl acrylamide, TENAM], paranuxadecylnaphthyl acrylamide [N- (p-hexadecyl acryl
- the monomer molecules can be formed more regularly and polymer chains in which well-oriented monomer molecules are bound. As a result, more regular void spaces are formed on the hard segment prepared from the monomer of Formula 4, and soft segments are regularly arranged in the spaces, and a block in which better and regular nanostructures and nanopatterns are expressed.
- the copolymer and the thin film can be prepared. Since the monomer of Formula 4 and a method of preparing the same are apparent to those skilled in the art, such as Korean Patent Application No. 2011-0087290 (Korean Patent Registration No. 1163659), the detailed description thereof will be omitted.
- the radical initiator, the RAFT reagent and the monomer of Formula 3 may be prepared as a reaction solution dissolved in an organic solvent, and the RAFT polymerization process may be performed in the semi-aqueous solution state.
- the organic solvent is methylene chloride
- Such an organic solvent may be used in about 2 to 10 times the weight of the monomer of formula (3). This organic solvent may be used as a reaction medium in the RAFT polymerization step
- radical initiator any initiator known to be usable for radical polymerization can be used without particular limitation.
- radical initiators are azobisisobutyronitrile (AIBN), 2,2'-azobis-2,4-dimethylvaleronitrile (2,2'-azobis- (2,4-dimethylvaleronitrile), Benzoyl peroxide (BPO) or di-t-butyl peroxide (DTBP), and the like, and two or more selected from them may be used. The same may be used in the polymerization step for the monomer of 4.
- AIBN azobisisobutyronitrile
- BPO Benzoyl peroxide
- DTBP di-t-butyl peroxide
- S-1-dodecyl -S '-(a, ⁇ '-dimethyl- ⁇ "-acetic acid) trithiocarbonate [S-1 -dodecyl-S'-(a, a ' -dimethyl-a "-acetic acid) trithiocarbonate], cyanoisopropyl dit iobenzoate, cumyl thiobenzoate, cumyl phenylthioacetate, 1-phenylethyl- 1-phenyldithioacetate (1 -phenylethyl-1 -phenyldithioacetate), or 4-cyano-4- (thiobenzoylthio) -N-succinimidebarrate (4-cyano-4- (thiobenzoylthio) -N- pyrolysis initiators such as succinimide valerate) may be used, and two or more combinations thereof may be used.
- the RAFT reagent may be used in a ratio of about 0.001 to 5.0 mol% based on the weight of the monomer of Formula 3, wherein the radical initiator is It may be used in a molar equivalent ratio of about 0.1 to 1.0 relative to the RAFT reagent. With this content, the RAFT polymerization process can be effectively carried out using radical initiators and RAFT reagents.
- a kind of macroinitiator of the type in which the RAFT reagent is bonded to both ends of the (meth) acrylate polymer polymerized with the monomer of Formula 3 may be obtained.
- Such macroinitiators may have a molecular weight that matches the soft segments of the final block copolymer, and may have a number average molecular weight of about 3000 to 100000, or a number average molecular weight of about 5000 to 50000.
- the RAFT polymerization step for the monomer of the formula (4) in the presence of the macroinitiator and the radical initiator of the polymerization product thereof.
- This RAFT polymerization process can be carried out using the radical initiator and the organic solvent in the same kind and amount as in the first RAFT polymerization process, but in the presence of the above-mentioned macroinitiator in place of the RAFT reagent.
- the macroinitiator, the radical initiator, the monomer of Formula 4 and the organic solvent are uniformly mixed to form a solution, and after removing the oxygen present in the solution under a nitrogen atmosphere, The RAFT polymerization step for the monomer of Formula 4 may be performed.
- each RAFT polymerization process for the monomers of Formulas 3 and 4 is performed at a reaction temperature of about 30 to 140 ° C., or 60 to 130 ° C., about 30 to 200 hours, or about 50 to 170 hours. May proceed.
- the step of precipitating the polymerization product thereof in the non-solvent can be further proceeded.
- the above-mentioned block copolymer can be obtained with high purity.
- a solvent which does not dissolve the above-described polymerization product for example, a polymer and a block copolymer for each segment
- examples of such non-solvents include methanol, ethane, normal propane, isopropane, or And polar solvents such as ethylene glycol and nonpolar solvents such as petrolium ether, and two or more mixed solvents selected from them may be used.
- a thin film of the above-described block copolymer is formed on the silicon oxide on the substrate.
- the silicon oxide may be formed on a substrate such as a silicon substrate or a wafer by a conventional method such as deposition or thermal oxidation of the substrate.
- the block copolymer may be dissolved in an organic solvent and coated on a substrate.
- the block copolymer may have a number average molecular weight of about 5000 to 200000, and may include a hard segment of about 40 to 90 weight 0 /. And a soft segment of about 60 to 10 weight 0 /. As described above.
- the block copolymer As the block copolymer satisfies such a molecular weight and the content range of each segment, the block copolymer is treated by solvent aging or heat treatment, and thus a thin film of a block copolymer having a regular nanostructure or nanopattern is expressed. Can be formed.
- the molecular weight of the blotting copolymer or the content range of each segment it is possible to appropriately adjust the shape, size or spacing, etc. of the nano-pattern finally formed.
- the organic solvent for dissolving the block copolymer is n-nucleic acid, n-heptane, n-octane, cyclonucleic acid, methylene chloride, 1,2-dichloroethane, chloroform, ethyl ether, benzene, chlorobenzene, dichloro
- One or more solvents selected from nonpolar or polar solvents such as benzene, toluene, THF, acetone, dioxane, ethyl acetate, DMF, DMAC, or DMSO can be used.
- the amount of the organic solvent may be about 10 times or more based on the weight of the block copolymer.
- the organic solution of the block copolymer is spin-coated on a substrate with a spin coater or the like.
- a thin film can be formed.
- the number and concentration of the solvent, as well as the rotational speed and rotational time of the spin coater is important, in consideration of this point the rotational speed and time can be adjusted between about 2000-4000 rpm, about 20-60 seconds respectively.
- the step of orienting each segment of the block copolymer by solvent aging or heat treatment of the thin film can be carried out.
- the same organic solvent as that used for dissolving the block copolymer may be used, but it is preferable to use two or more mixed solvents each selected from a nonpolar solvent and a polar solvent.
- the solvent aging may proceed for about 4 to 96 hours at the temperature of the phase silver.
- the nanostructure or nanopattern in the form of more regular soft segments may be expressed on the thin film of the block copolymer.
- the thin film may be heat treated to orient each segment of the block copolymer.
- T m melting point of the repeating unit of Formula 1 forming the hard segment
- Heat treatment may be performed at temperatures above the glass transition temperature (T g ) of the repeating unit of 2.
- T g glass transition temperature
- the arrangement of the nano-pattern having the cylindrical form or the like to adjust to a variety of shapes, such as square or hexagon shape, or the size of each pattern or the spacing between patterns Can be.
- the molecular weight of the block copolymer or the chemical structure or composition ratio of each segment may also be appropriately adjusted.
- the step of adsorbing a material selectively adsorbable on the hard segment may be performed on the thin film.
- metal Oxides can be used, for example oxides of transition metals such as Ru or Os.
- the adsorption step of such materials on the thin film of the block copolymer from about 0.05 to 1.0 wt. 0/0, or from about 0.1 to 0.8 weight 0 /., Black is about 0.1 to 0.6 weight 0/0 concentration a solution of the metal oxide may be carried out in a manner to process (e. g., a solution of Ru0 4 or OsO 4).
- kinds of substances that can be adsorbed to such hard segments may determine the shape of the nanopattern. Therefore, by controlling the treatment conditions and reaction conditions of the material, not only can control the silicon oxide nano-pattern (nano dot, nano holes or nano-structure that they are present) to be formed, but also the size or spacing of the nano-pattern Etc. can also be easily controlled.
- the step of selectively removing the soft segment from the thin film is performed.
- ultraviolet rays may be irradiated to the thin film of the block copolymer. Through the ultraviolet irradiation, the soft segment is selectively decomposed, and then the thin film of the block copolymer is selectively treated with an acid to remove the soft segment decomposed by the ultraviolet.
- ultraviolet rays having a wavelength of about 254 nm may be irradiated for about 1 to 60 minutes at an intensity of about 5 to 50 Joules per square centimeter (cm 2 ), and then an acid of the block copolymer may be used.
- the thin film may be processed to remove soft segments decomposed into ultraviolet rays.
- an aqueous solution such as hydrochloric acid, acetic acid or trifluoroacetic acid may be used, and various acids or aqueous solutions thereof may be used.
- 99.5% acetic acid or trifluoroacetic acid aqueous solution or 3.5-11.8 M hydrochloric acid aqueous solution may be used. From about 1 to 20 mL of the aqueous acid solution, or from about 2 to 10 mL
- the decomposed soft segment By treating the thin film of block copolymer for 1 hour, the decomposed soft segment can be satisfactorily removed.
- the step of washing the thin film of the block copolymer with deionized water may further proceed.
- the soft segment is selectively removed from the block copolymer thin film, and the hard segment is left to form a nano structure or a nano pattern.
- a thin film of the block copolymer can be formed.
- the shape, size, or spacing of nanopatterns formed on the block copolymer thin film may be controlled and / or partially modified. can do.
- this phenomenon appears to be due to the polymer chain structure and the chemical reaction properties of the hard segment of the block copolymer, because these polymer chains cause a chemical reaction depending on the specific conditions of the soft segment removal process.
- the shape, size, or spacing of the silicon oxide nanopattern finally formed may be more easily controlled.
- silicon oxide on the substrate may be exposed in the portion where the nano-pattern such as a cylinder form was formed. Accordingly, when a thin film of such a block copolymer is used as a mask and semi-atom etching of silicon oxide is performed, the silicon oxide is selectively etched and removed only at the exposed portion, thereby forming a desired pattern shape, for example, a nano dot or nano hole pattern. Can be formed.
- the reactive ion etching step may be performed under conditions of about 40 to 60/20 to 40 sccm, about 60 to 100 Watts and 1 to 10 minutes, using, for example, CF 4 / Ar gas ions.
- a step of removing the thin film of the block copolymer by treating with an oxygen plasma is further performed, so that the thin film of the block copolymer remaining on the patterned silicon oxide (eg, hard segment).
- the shape, size or spacing of the silicon oxide nanopattern finally formed in one embodiment may be easily controlled.
- the shape of the final nano pattern may be changed from nano hole pattern form to nano dot pattern form or nano hole and nano dot form. Can be.
- the nano-pattern of silicon oxide formed by the method of the above-described embodiment has a form in which silicon oxide nano dots having a diameter of about 5 to 60 nm are formed at intervals of about 10 to 100 nm.
- the "diameter" of a nano dot or nano hole may mean the longest distance of a straight line connecting any two points on the outer circumference of one nano dot or nano hole, and is referred to as an "interval (or pitch)". May refer to the shortest straight distance of the distance between the adjacent nano dots or nano holes.
- the nano hole pattern may be reduced to a nano dot pattern, a nano dot pattern, or a nano hole by reducing an acid treatment time for removing a soft segment or reducing an acid throughput or concentration. It was found that the holes could be converted into a pattern of common shapes.
- the type of acid treated in the above process is By changing, increasing the concentration of the substance adsorbed on the blotting copolymer thin film, or controlling the molecular weight of the block copolymer, the nano-pattern shape, size (diameter) or spacing, etc. can also be controlled within the above-mentioned range. have.
- the shape of the silicon oxide nanopattern or the aspect ratio thereof can be controlled by changing the conditions or the number of recovery or etching conditions of the semi-astringent ear.
- the nano dot or nano hole pattern of silicon oxide formed according to an embodiment may be a nano pattern having a relatively low aspect ratio and a portion of the adjacent nano dots or nano holes connected to each other.
- a nano pattern including silicon oxide nano dots having a high aspect ratio of about 1.2 or more, or about 1.4 or more, or nano holes on the silicon oxide, and under the control of the above-described process conditions, such a nano pattern Shape and size can easily be controlled.
- the present invention is suitable for various optical devices, optical waveguides, chemical sensors, electronic devices, or magnetic storage media, etc., than nanopatterns having various shapes, sizes, and spacings, such as nano dots or nano holes having various shapes and sizes. Applicable
- the metal nano-pattern forming method includes forming a thin film of a block copolymer including a hard segment including a repeating unit of Formula 1 and a soft segment including the (meth) acrylate-based repeating unit of Formula 2 on a substrate. Making; Selectively removing the soft segment from the thin film of block copolymer; And depositing a metal on the block copolymer thin film from which the soft segment has been removed.
- the method of another embodiment may further comprise the step of forming a silicon oxide between the substrate and the thin film of the block copolymer, in this case, before the metal deposition step, using a block copolymer thin film having the soft segment removed,
- the method may further include forming a nano dot or nano hole pattern of silicon oxide by semi-atom ion etching the silicon oxide. That is, in another embodiment, the nano-pattern of the block copolymer may be formed, and the metal nano-pattern may be formed directly using the nano-pattern, and after forming the nano-hole pattern of silicon oxide, etc. according to the exemplary embodiment of the present invention, Metal nano-patterns may be formed using this.
- FIG. 6A is a view schematically showing a method of forming the metal nanopattern according to an example of the invention
- FIG. 6B is a schematic view of a plan view of the metal nanopattern having a nano dot shape formed according to the method of FIG. 6A. The figure is shown.
- a thin film of a block copolymer in which a nano-pattern or a nanostructure is expressed in a cylinder form is formed, and then the soft segment is irradiated with ultraviolet rays. Can be selectively removed.
- BCP patterns of the block copolymer may be formed.
- the nano hole pattern of silicon oxide may be formed by the method of the embodiment using the same, and then the metal nano pattern may be formed using the same.
- the metal nano pattern in the form of nano dots as shown in the bottom view of FIG. 6A and FIG. 6B may be formed.
- each step before the metal deposition step may proceed in accordance with the silicon oxide nano pattern formation method of one embodiment, and the metal deposition step may proceed in accordance with a general metal deposition process, More detailed description will be omitted.
- the metal is a magnetic metal, for example, a magnetic metal selected from the group consisting of cobalt, chromium, platinum, nickel and iron, Or a magnetic alloy containing two or more selected from these.
- the metal may be deposited to a thickness of about 10 to 50 nm by a method such as electron vapor deposition, vacuum sputtering, or vacuum deposition.
- the metal nano dot pattern as shown in the bottom view of FIG. 6A and FIG. 6B may be formed.
- the metal nano dot pattern includes the above-described magnetic metal, it may be suitably applied to a magnetic recording medium for next generation information storage.
- the metal nanopattern forming method can be appropriately applied to the production of various electronic devices such as memory semiconductors, solar cells, displays or sensors.
- the block copolymer thin film on which the metal is deposited is lifted off and removed.
- the steps may be further performed.
- a metal nanopattern having the shape shown in FIG. 7A and the bottom view of FIG. It can be suitably applied to the production of.
- FIG. 8. 6 and 7 in the metal deposition step, the soft segment is removed and metal having a lower thickness than the thin film of the remaining block copolymer is deposited.
- a metal having a higher thickness is deposited so that the thin film pattern or the nano hole pattern is embedded.
- the metal may be deposited to a thickness of about 30 to 70 nm by electron vapor deposition, vacuum sputtering, or vacuum evaporation.
- the removal may be further performed by etching.
- the metal on the block copolymer thin film forming the skeleton of the block copolymer thin film pattern or the nano hole pattern is etched and removed over the entire surface, and then all the metal on the thin film pattern or the non-copolymer thin film is removed.
- a block copolymer thin film may be selectively removed. This is because the block copolymer thin film and the like can be etched and removed at several to tens of times the speed of the metal.
- a metal dot pattern in the form of a nano dot may be formed, and the metal nano pattern may also be used in various electronic devices such as next generation magnetic stock media, memory semiconductors, solar cells, displays, or sensors. It can be suitably applied to manufacturing.
- a magnetic recording medium for storing information comprising a metal nano pattern formed by the above-described method.
- the nano dot pattern of the magnetic metal needs to be formed to include nano dots having a center distance of about 30 nm or less and a diameter of about 15 nm or less.
- conventional photolithography has physical limitations in forming such a small size metal nano dot pattern.
- an electronic lithography method capable of forming ultra-high density nanopatterns has also been considered, but its mass production was very weak and could not be used for commercialization.
- block copolymers When using lithography, there are limitations such as the need for additional processing in the vertical alignment, uneven alignment of the block copolymer pattern, or a very complicated subsequent process after the formation of the block copolymer nano-drain pattern. There was no choice but to form a dot pattern, and the commercialization of the next generation magnetic recording media was facing limitations.
- the magnetic metal nanopattern obtained according to another embodiment can be applied to the manufacture of the magnetic recording medium for the next generation information storage, and can greatly contribute to the commercialization of such a next generation magnetic recording medium.
- the nano-pattern forming method of the above-described embodiment is clearly revealed, when using a unique block copolymer including a repeating unit of Formula 1, the nano dot pattern shape, size and spacing, etc. can be very easily controlled. However, it is possible to easily form a nano dot pattern having a larger aspect ratio. For example, even when the metal nanopattern is formed according to the example method shown in FIG. 6, the thin film pattern of the block copolymer may have an extremely high height and aspect ratio, and even when a metal having a relatively large thickness is deposited, the metal on the thin film pattern may be formed. And short-circuit or interconnection between the metals between the thin film patterns can be effectively suppressed. Therefore, the magnetic metal nanopattern formed by the method of another embodiment can be applied very suitably to the manufacture of various next generation magnetic recording media.
- the magnetic recording medium according to another embodiment may be in accordance with a conventional configuration except that it includes a metal nano-pattern formed by another embodiment, further description thereof will be omitted.
- TEOS sol-gel precursor As described above, according to the present invention the use of TEOS sol-gel precursor, Alternatively, a nano dot or nano hole pattern of silicon oxide may be easily formed without a complicated subsequent process such as a PDMS coating process. In addition, according to the present invention, it is possible to easily form a metal nano pattern in the form of nano dots without having to go through a complicated subsequent process or the like.
- the nano-pattern may be formed while controlling the shape, size, or spacing of the nano-dot or nano-hole pattern of the silicon oxide or the metal to a desired range very easily.
- the nanopattern forming method of the present invention can be suitably applied to the process of forming a micropattern of an electronic device including a next-generation semiconductor device, or to manufacturing a nano biosensor, and the metal nanopattern forming method is a magnetic recording medium for next-generation information storage. It can be applied to the production of such a large contribution to its commercialization.
- Figure 1a is a photograph of the nanostructure measured by the AFM after forming the block copolymer thin film by solvent aging in Example 5.
- FIG. 1B is a SEM photograph after selectively removing a soft segment by irradiating ultraviolet rays to the block copolymer thin film of FIG. 1A.
- FIG. 1C is a SEM photograph of the silicon oxide nano hole pattern formed on the lower portion of the block copolymer thin film by selectively removing the soft segment in FIG. 1B and then performing semiungung ion etching and oxygen plasma treatment.
- FIG. 2A is a SEM photograph after selectively removing a soft segment by irradiating ultraviolet rays to the block copolymer thin film in Example 6.
- FIG. 2B is a SEM photograph of the silicon oxide nano dot pattern formed on the lower portion of the block copolymer thin film by selectively removing the soft segment in FIG. 2A and then performing semiungung ion etching and oxygen plasma treatment.
- FIG. 2C is a SEM photograph of the surface and cross section of the resultant in which the nano dot pattern of FIG. 2B is formed.
- Figure 3a is semi-atom ion etching and oxygen plasma treatment in Example 7 SEM process after the process is performed once to form a silicon oxide nano dot pattern under the block copolymer thin film.
- FIG. 3B is a SEM photograph after forming a silicon oxide nano dot pattern on the bottom of the block copolymer thin film by performing semi-ungular ion etching and oxygen plasma treatment twice in Example 7.
- FIG. 3B is a SEM photograph after forming a silicon oxide nano dot pattern on the bottom of the block copolymer thin film by performing semi-ungular ion etching and oxygen plasma treatment twice in Example 7.
- FIG. 4 is a SEM photograph after forming a silicon oxide nano pattern (including nano dots and nano holes together) in Example 8.
- FIG. 4 is a SEM photograph after forming a silicon oxide nano pattern (including nano dots and nano holes together) in Example 8.
- Figure 5a is a photograph of the nanostructure measured by AFM after the block copolymer thin film formed by solvent aging in Example 9.
- FIG. 5B is a SEM photograph after forming a silicon oxide nano dot pattern by irradiating ultraviolet rays to the block copolymer thin film of FIG. 5A and performing a reactive ion etching and oxygen plasma treatment process on the lower silicon oxide.
- 6A is a view schematically illustrating a method of forming a metal nano pattern in the form of a nano dot according to an embodiment of the present invention.
- FIG. 6B schematically illustrates a plan view of a metal nano pattern in the form of a nano dot formed according to the method of FIG. 6A.
- FIG. 7A is a view schematically illustrating a method of forming a metal nanopattern in the form of a nano dot according to another example of the present invention.
- FIG. 7B schematically illustrates a plan view of a metal nano pattern in the form of a nano dot formed according to the method of FIG. 7A.
- FIG. 8 is a view schematically illustrating a method of forming a metal nano pattern in the form of a nano dot according to another embodiment of the present invention.
- FIG. 9A is a SEM photograph after forming a nano pattern (nano dot) of a ferromagnetic material through the method of Example 10 shown schematically in FIG. 8.
- FIG. 9B is a ferromagnetic Ni 0. 0 method through the method of Example 10 schematically shown in FIG. 8.
- FIG. 8 Fe 0 . 2 is a SEM image after forming a nano pattern (Nano dot). [Specific contents to carry out invention]
- the reaction solution was immersed in 200 mL of methane as an extractant, filtered under reduced pressure, and dried to obtain a macrochromic initiator (Macra-PMMA) -I having a RAFT reagent bound to both ends of the polymer (PMMA) of MMA.
- Macra-PMMA macrochromic initiator
- the polymerization conversion, number average molecular weight (M n ), molecular weight distribution (M w / M n ) and glass transition temperature (T g ) were 95%, 19400, 1.11 and 119 ° C., respectively.
- composition ratio of the soft segment to the block copolymer -1 hard segment was found to be 65% by weight 0 / ° to 35% by weight.
- Polymerization conversion, number average molecular weight, molecular weight distribution, T g and melting temperature (T m ) were 56%, 54900, 1.30, 119 ° C. and 236 ° C., respectively.
- T m melting temperature
- Example 2 except that 0.774 g of acrylamide-based monomer DOPAM synthesized in Example 1 of Korean Patent Application No. 1163659, 0.3 g of the macroinitiator obtained in Example 3, 3.0 mg of AIBN, and 4.011 mL of benzene were used. Proceed in the same manner to prepare a light yellow new block copolymer-2.
- the composition ratio of the soft segment to the hard segment (ratio of the number average molecular weight measured by GPC) was found to be 66 weight 0 / ⁇ to 34 weight 0 / ⁇ . Conversion ratio, number average molecular weight , The molecular weight distribution, T g and T m were 66%, 32400, 1.30, 119 ° C. and 235 ° C., respectively.
- Examples 5 to 9 Formation and Identification of Silicon Oxide Nano Patterns
- the block copolymer -1 prepared in Example 2 was dissolved in a chloroform solvent to make a 1.Owt% solution, and then coated on a substrate of a silicon wafer on which silicon oxide was formed on the surface by using a spin coater at a speed of 3000 rpm for 60 seconds. A block copolymer thin film was formed. This thin film was kept in an atmosphere of mixed solvent vapor of THF / cyclonucleic acid 8/2 (v / v, volume ratio). Into the desiccator and aged for 24 hours to express the nanostructure on the surface of the thin film.
- the nanostructured thin film was placed in a vial containing 0.1 weight 0 / ⁇ Ru0 4 liquid and adsorbed Ru0 4 for 2 minutes, and then irradiated with UV light having a wavelength of 254 nm for 20 minutes and 99.5%. After dipping in 2.5 ml of acetic acid solution for 20 minutes, taken out, washed several times with deionized water and dried to prepare a thin film engraved with nano-pattern selectively soft block of block copolymer-1.
- RIE reactive ion etching
- FIG. 1a is a photograph taken after the formation of a thin film of the block copolymer -1 nanostructure expressed by the solvent aging method by AFM, confirming that the cylindrical nano-pattern is well arranged in a two-dimensional hexagonal shape do.
- FIG. 1B is a SEM photograph after selectively removing the soft segment by irradiating ultraviolet rays to the thin film of the block copolymer-1, and the black cylinder-shaped nano pattern in which the soft segment is selectively removed has a two-dimensional hexagonal shape. It is confirmed that it is well arranged. At this time, the diameter and the spacing (pitch) of the cylindrical nanopattern are confirmed to be about 25 nm and 45 nm, respectively.
- FIG. 1C shows a surface and a cross-sectional view of the surface after cross-sectional formation of the silicon oxide nanopattern under the thin film of the block copolymer -1 by selectively removing the soft segment, and then performing semi-ungsung etching and oxygen plasma treatment. It is a photograph taken. According to this FIG. 1C, it is confirmed that on a large area (3x / m) silicon wafer substrate, a nano hole pattern including nano holes on silicon oxide is well arranged in a vertical hexagon shape. At this time, the diameters and pitches (pitch) of the nano holes are confirmed to be about 25 nm and 45 nm, respectively.
- Example 6 Formation of Silicon Oxide Nano Dot Pattern (Nano Dot-1) Using Block Copolymer-1
- FIG. 2A is a SEM photograph after forming a thin film of block copolymer -1 expressing a nanostructure, and selectively removing soft segments by irradiating ultraviolet rays thereto, wherein p yDOPAM forming a hard segment of the block copolymer is a nano dot pattern It is confirmed that the two-dimensional hexagonal shape is well arranged.
- FIG. 2B is a SEM image of the surface after forming the silicon oxide nanopattern on the bottom of the thin film of the fluoropolymer-1 by performing the semiungung ion etching and oxygen plasma treatment after selectively removing the soft segment. It is a photograph. According to this FIG. 2B, it is confirmed that the nano dot pattern including the silicon oxide nano dots ' is well arranged in a vertically hexagonal shape on a large area (3 ⁇ 2 / zm) silicon wafer substrate. At this time, the diameter and pitch of the nano dots are confirmed to be about 25 nm and 45 nm, respectively.
- FIG. 2C is a SEM photograph of the surface and the cross section of the resultant in which the nano dot pattern of FIG. 2B is formed. It is confirmed that the aspect ratio of the nano dots is about 1.5, which is very high.
- a nano pattern of silicon oxide was formed in the same manner as in Example 5, except that 2.668 mL of a 3.5M aqueous hydrochloric acid solution was used instead of the acetic acid solution.
- the reactive ion etching and oxygen plasma treatment processes were repeatedly performed twice under the same conditions. These nano The pattern was found to be a nano dot pattern comprising silicon oxide nano dots.
- FIG. 3A is a SEM photograph after forming the silicon oxide nano dot pattern below the block copolymer thin film by performing the semi-ungular ion etching and oxygen plasma treatment process only once
- FIG. 3B illustrates the reactive ion etching and oxygen plasma treatment processes. It is a SEM photograph after repeating twice and forming the silicon oxide nano dot pattern. In FIG. 3A, it is confirmed that some of the nano dots are connected to each other. However, in FIG. 3B, it is confirmed that the nano dots forming the nano dot pattern are formed independently without being connected to each other.
- the nanopattern of silicon oxide was formed in the same manner as in Example 5, except that the time for immersing the nanostructure-expressing thin film in acetic acid solution was increased to 40 minutes. Referring to FIG. 4, the nanopattern was found to be a silicon oxide nanopattern in a form including silicon oxide nanoholes and nanodots together.
- Example 5 Carried out using a block copolymer -2 prepared in Example 4, and into a thin film with a nanostructured expression to 0.4 weight 0/0 of Ru0 4 vial (vial) containing a liquid except for adsorption for four minutes the RuO 4 In the same manner as in Example 5 A nano pattern of oxides was formed. This nanopattern was found to be a nanodot pattern comprising silicon oxide nanodots.
- Figure 5a is a photograph taken after the formation of a thin film of the block copolymer -2 expressed nanostructure by the solvent aging method by AFM, confirming that the cylindrical nano-pattern is well arranged in a two-dimensional hexagonal shape do. At this time, the diameter and pitch of the cylindrical nano-pattern are confirmed to be about 15 nm and 31 nm, respectively.
- 5B shows a surface view of the surface after forming a silicon oxide nanopattern under the thin film of the block copolymer-2 by selectively removing the soft segment from the thin film and performing semi-ungular ion etching and oxygen plasma treatment. It is a photograph taken. According to this FIG.
- the nano dot pattern including the silicon oxide nano dots is well arranged in a hexagonal shape on the silicon wafer substrate.
- the diameter and pitch of the nano dots are confirmed to be about 15 nm and 31 nm, respectively.
- Example 4 Using the block copolymer -2 prepared in Example 4 and in the same manner as in Example 5 to form a nano hole pattern of silicon oxide. Subsequently, Co metal black with ferromagnetic properties is Ni 0. By electron beam evaporation or sputtering. 8 Fe 0 . Alloy 2 (permalloy) was deposited to form a ferromagnetic metal thin film. In this case, the ferromagnetic metal thin film was deposited and formed to a thickness of about 70 nm larger than this to fill the nano hole pattern.
- the ferromagnetic metal thin film After the formation of the ferromagnetic metal thin film, it is etched with a CF 4 vacuum plasma (plasma) formed with a power of 100 to 500 W, the metal present on the nano-pattern of the block copolymer forming the skeleton of the nano-hole pattern, and the block The nano pattern of the copolymer was selectively removed.
- plasma CF 4 vacuum plasma
- the metal on the nanopattern of the block copolymer is entirely removed, and once the nanopattern of the block copolymer is removed. After exposure, the nanopattern of the block copolymer may be etched away much faster than the metal.
- FIGS. 9A and 9B SEM images of such ferromagnetic metal nano patterns are shown in FIGS. 9A and 9B.
- 9A is a SEM photograph of the nanopattern formed of a ferromagnetic Co metal
- FIG. 9B is a SEM photograph of the nanopattern formed of a ferromagnetic Ni 0.8 Fe 0.2 alloy, each having a diameter of about 15 nm to 25 nm. It was confirmed that they were formed relatively regularly on a large area substrate.
- the ferromagnetic metal nanopattern in the form of nano dots is expected to be applicable as a magnetic recording medium for storing next-generation large-capacity information.
- the soft segment is selectively removed by UV irradiation, and the silicon oxide is masked using the thin film of the block copolymer as a mask. It was confirmed that by semi-eutectic etching, a good silicon oxide nano dot or nano hole pattern can be formed very easily.
- the nano-dot pattern can easily form a ferromagnetic metal nano pattern in the form of a nano dot applicable as a magnetic recording medium for storing large-capacity information.
- the type or concentration of acid treated to remove the soft segment after the ultraviolet irradiation, the type or concentration of acid treated to remove the soft segment, the deionized water washing time after the acid treatment, and also the metal oxide adsorbed on the thin film from which the soft segment has been removed, such as RuO 4 or Os0 4
- the black semi-ungular ion etching and the conditions or the number of times of the oxygen plasma treatment process the nano pattern of the desired form (nano dot, nano hole, or the form in which they exist together) can be easily formed. It was confirmed that.
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JP2015525374A JP6042986B2 (ja) | 2012-09-10 | 2013-09-05 | シリコンオキサイドのナノパターン形成方法、金属ナノパターンの形成方法およびこれを用いた情報貯蔵用磁気記録媒体 |
EP13834601.0A EP2894660B1 (en) | 2012-09-10 | 2013-09-05 | Method for forming silicon oxide nanopattern |
CN201380046681.9A CN104662641B (zh) | 2012-09-10 | 2013-09-05 | 形成氧化硅纳米图案的方法,形成金属纳米图案的方法以及使用其的信息存储用磁性记录介质 |
US14/419,616 US9495991B2 (en) | 2012-09-10 | 2013-09-09 | Method for forming silicon oxide and metal nanopattern's, and magnetic recording medium for information storage using the same |
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KR101490405B1 (ko) * | 2012-10-19 | 2015-02-06 | 주식회사 엘지화학 | 금속 나노와이어 또는 금속 나노메쉬의 금속 나노구조체의 형성 방법 |
WO2015084121A1 (ko) | 2013-12-06 | 2015-06-11 | 주식회사 엘지화학 | 블록 공중합체 |
EP3101043B1 (en) | 2013-12-06 | 2021-01-27 | LG Chem, Ltd. | Block copolymer |
US10160822B2 (en) | 2013-12-06 | 2018-12-25 | Lg Chem, Ltd. | Monomer and block copolymer |
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KR20140033761A (ko) | 2014-03-19 |
EP2894660A4 (en) | 2016-03-30 |
US20150228298A1 (en) | 2015-08-13 |
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