WO2007142000A1 - 多孔質膜の前駆体組成物及びその調製方法、多孔質膜及びその作製方法、並びに半導体装置 - Google Patents
多孔質膜の前駆体組成物及びその調製方法、多孔質膜及びその作製方法、並びに半導体装置 Download PDFInfo
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- WO2007142000A1 WO2007142000A1 PCT/JP2007/060027 JP2007060027W WO2007142000A1 WO 2007142000 A1 WO2007142000 A1 WO 2007142000A1 JP 2007060027 W JP2007060027 W JP 2007060027W WO 2007142000 A1 WO2007142000 A1 WO 2007142000A1
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- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 description 1
- TUQLLQQWSNWKCF-UHFFFAOYSA-N trimethoxymethylsilane Chemical compound COC([SiH3])(OC)OC TUQLLQQWSNWKCF-UHFFFAOYSA-N 0.000 description 1
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/48—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
- C08G77/56—Boron-containing linkages
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/48—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
- C08G77/58—Metal-containing linkages
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/14—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02126—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
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- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02203—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being porous
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02205—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition
- H01L21/02208—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and oxygen
- H01L21/02216—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and oxygen the compound being a molecule comprising at least one silicon-oxygen bond and the compound having hydrogen or an organic group attached to the silicon or oxygen, e.g. a siloxane
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02282—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process liquid deposition, e.g. spin-coating, sol-gel techniques, spray coating
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02337—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour
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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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02345—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to radiation, e.g. visible light
- H01L21/02348—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to radiation, e.g. visible light treatment by exposure to UV light
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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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/312—Organic layers, e.g. photoresist
- H01L21/3121—Layers comprising organo-silicon compounds
- H01L21/3122—Layers comprising organo-silicon compounds layers comprising polysiloxane compounds
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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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/31695—Deposition of porous oxides or porous glassy oxides or oxide based porous glass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
Definitions
- the present invention relates to a precursor composition of a porous film and a method for preparing the same, a porous film and a method for manufacturing the same, and a semiconductor device.
- a precursor composition of a porous film for producing a hydrophobic porous film having a low dielectric constant and a low refractive index and excellent mechanical strength and a method for preparing the same, and the precursor composition
- the present invention relates to a porous film obtained by using a material, a method for manufacturing the same, and a semiconductor device using the porous film.
- Non-Patent Document 2 a method in which a solution in which an alkoxysilane condensate and a surfactant are mixed in an organic solvent is applied to a substrate, and then the organic solvent is evaporated to prepare a film on the substrate.
- the target is related to hydrophobicity in heat-resistant ceramics, and is essentially different from a porous film as an interlayer insulating thin film for semiconductors, such as the presence or absence of impurities such as Na.
- Patent document 1 WO-91 / l 1390 pamphlet (claims, etc.)
- Non-Patent Document 1 Nature, 1996, 379 ⁇ (page 703)
- Non-Patent Document 2 Supramolecular Science, 1998, 5 ⁇ (247 pages, etc.)
- Patent Document 2 JP 2000-38509 A (paragraph numbers 0013, 0014, etc.)
- Patent Document 3 US Patent No. 6,208,014 (claims, abstracts, etc.)
- Non-Patent Document 3 J. Phys. Chem., B1997 ⁇ , 101 (6525, etc.)
- Patent Document 4 Japanese Patent Laid-Open No. 2002-3784 (Claims, paragraph number 0004, etc.)
- Patent Document 5 JP-A-2004-292304 (Claims, paragraph number 0020, etc.)
- Patent Document 6 US Pat. No. 5,939,141
- An object of the present invention is to solve the above-mentioned problems of the prior art, and has a low dielectric constant and a low refractive index, excellent mechanical strength, and improved hydrophobicity.
- porous membrane precursor composition of the present invention has the following general formula (1):
- R 1 represents a monovalent organic group
- R represents a hydrogen atom, a fluorine atom or a monovalent organic group
- R 2 represents a monovalent organic group
- a is an integer of 1 to 3
- R, R 1 and R 2 may be the same or different.
- thermally decomposable organic compound (C) When a compound having a thermal decomposition temperature of less than 250 ° C is used as the thermally decomposable organic compound (C), polymerization of alkoxysilanes represented by the general formulas (1) and (2) occurs. If this compound (C) decomposes quickly, it is difficult to obtain the designed pore size.
- the compound (E) By selecting a compound that thermally decomposes in the temperature range of 90 to 200 ° C as the compound (E), it does not act as a catalyst when added, and it is applied onto a substrate and acts as a catalyst after being heated. be able to.
- the catalyst When the pH is less than 6.5, the catalyst promotes hydrolysis by electrophilic reaction as a catalyst, and when the pH exceeds 8, the hydrolysis by electrophilic reaction is accelerated at the same time as addition, causing gelation. This is not preferable because it causes inconvenience when the porous material is used for a semiconductor.
- the thermally decomposable organic compound (C) contained in the precursor composition contains at least one surfactant having a molecular weight of 200 to 5,000.
- the molecular weight of the surfactant is less than 200, the pore size that can be formed is too small, and when it exceeds 5000, the pore size becomes too large.
- the metal ion impurity other than the element (D) contained in the precursor composition is lOppb or less.
- the metal ion impurity exceeds lOppb, it affects the reliability of the semiconductor device.
- the element (D) is B, Al, P, Zn, Ga, Ge, As, Se, In, Sn, Sb, Te, Rb, Cs, Ba, La, Hf, Ta, W, Re, It is characterized by Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, Po, At, and at least one element selected for the group force that is also a lanthanoid force.
- the compound (E) contained in the precursor composition is contained in a concentration of 0.03 to 0.13 mol with respect to 1 mol of Si atoms in the precursor composition. .
- the molar ratio with respect to Si atoms is less than 0.03 molar concentration, and if it exceeds 0.13 molar concentration, the relative dielectric constant of the obtained porous film is undesirably high.
- an organic compound containing at least one of a urea bond, a urethane bond and an amide bond in the molecule can be preferably used.
- Organic compounds containing urea bonds include those represented by general formula (3) R 2 OR 3
- A is an integer of 1 to 3, and is preferably at least one urea compound represented by Specific examples include urea, methylurea, 1,1-dimethylurea, 1,3-dimethylurea, ethylurea and the like. Of these, urea is particularly preferable.
- A is an integer of 1 to 3, and is preferably at least one urethane compound. Specific examples include methyl carbamate and ethyl carbamate.
- A is an integer of 1 to 3), and is preferably at least one of the amido compounds represented by: Specific examples include acetamide, N-methylformamide, N, N-dimethylformamide and the like.
- the compound (E) is an organic compound containing a urea bond represented by the general formula (3), and an organic compound containing a urethane bond represented by the general formula (4).
- an organic compound containing an amide bond represented by the general formula (5) may be used alone or in combination of two or more. Among these, it is preferable to use an organic compound containing a urea bond represented by the general formula (3).
- porous membrane precursor composition of the present invention is prepared by the following general formula (1):
- R 1 represents a monovalent organic group
- R represents a hydrogen atom, a fluorine atom or a monovalent organic group
- R 2 represents a monovalent organic group
- a is an integer of 1 to 3
- R, R 1 and R 2 may be the same or different.
- Element (D) or at least one compound containing this element (D) is mixed in an organic solvent, and the resulting mixture is further pyrolyzed within a temperature range of 90 ° C to 200 ° C. And a compound that generates amines by this thermal decomposition, and below this thermal decomposition temperature, ⁇ of an aqueous solution of this compound and Z or a mixed solution of water and alcohol The compound (E) in which ⁇ falls within the range of 6.5 to 8 is mixed.
- the method for preparing the precursor composition at least one selected from the compound (A) represented by the general formula (1) and the compound (B) represented by the general formula (2) is used.
- a seed compound and the thermally decomposable organic compound (C) are mixed in an organic solvent, and the obtained mixed solution contains at least one element (D) or at least one containing the element (D).
- the thermally decomposable organic compound (C), the metal ion impurity in the precursor composition, and the additive element (D) are also used.
- the molar concentration of the compound (E) with respect to 1 mol of Si atom in the compound (E) and the precursor composition is as described above.
- the method for producing a porous membrane of the present invention comprises a solution of the precursor composition of the porous membrane or a solution of the precursor composition of the porous membrane prepared by the method of preparing the precursor composition. It is coated on the substrate and dried in the temperature range of 100 to 400 ° C. Wavelength 157 ⁇ for the film! After irradiating with UV light of ⁇ 344 nm, a hydrophobic compound having at least one kind of hydrophobic group and polymerizable group selected for the vapor phase is reacted in a gas phase at a temperature range of 100-600 ° C to make hydrophobic It is characterized by producing a porous film.
- the porous film preparation method when the drying temperature is less than 100 ° C, no film is formed, and when it exceeds 400 ° C, the formation of pores is insufficient. In addition, when the reaction temperature of the gas phase reaction is less than 100 ° C, the gas phase reaction does not occur sufficiently, and when the reaction temperature exceeds 600 ° C, the porous film contracts to increase the relative dielectric constant. .
- the hydrophobic compound includes a hydrophobic group comprising an alkyl group having 1 to 6 carbon atoms or a CH group.
- a compound having at least one polymerizable group such as hydrogen atom, OH group or halogen atomic energy.
- the number of carbon atoms is 7 or more, the molecular size increases and the diffusion into the vacancies is affected.
- the hydrophobic compound is also Si-X-Si (wherein X represents an oxygen atom, NR 3 group, CH or CH represents n 2n 6 4, R 3 represents CH or CH, and n represents 1 or 2) Yes, m is 1
- m 2m + l is an integer from 6 5 to 6.
- Si-A A is a hydrogen atom, OH group, OC H
- b 2b + 1 or a halogen atom A in the same molecule may be the same or different.
- b is an integer of 1-6.
- n 3 or more
- m 7 or more
- b 7 or more.
- the size of the molecule will increase, affecting the diffusion into the vacancies.
- the halogen atoms are fluorine, chlorine, bromine and iodine.
- the porous membrane of the present invention is obtained according to the above-described method for producing a porous membrane.
- the semiconductor device of the present invention is obtained by using a porous film obtained according to the above-described method for producing a porous film.
- a porous film with improved mechanical strength can be produced by repeating the porous film production method a desired number of times.
- the hydrophobized porous film of the present invention can be obtained according to the above-described method for producing a porous film, and the semiconductor device of the present invention can be obtained using this hydrophobized porous film.
- porous membrane precursor composition of the present invention By using the porous membrane precursor composition of the present invention, a porous membrane having a low dielectric constant and a low refractive index, excellent mechanical strength, and improved hydrophobicity can be produced. If this porous film is used, a desired semiconductor device can be provided.
- a porous membrane having desired characteristics is represented by the following general formula (1):
- R 1 represents a monovalent organic group
- R represents a hydrogen atom, a fluorine atom or a monovalent organic group
- R 2 represents 1)
- a is an integer of 1 to 3
- R, R 1 and R 2 may be the same or different, and at least one compound selected from 200 to Thermally decomposable organic compound (C) with a molecular weight of 5000 and a surfactant that exhibits thermal decomposition at 250 ° C or higher, and elemental power with specific Pauling electronegativity, ionic radius, and atomic weight
- a compound, such as urea that decomposes with at least one element (D) in the temperature range of 90 ° C to 200 ° C and generates amines by this thermal decomposition, and below this thermal decomposition temperature
- the aqueous solution of this compound and the compound (E) whose pH of the mixed solution of Z or water and alcohol falls within the range of 6.5 to 8 and an organic solvent are contained.
- the solution of the precursor composition comprises at least one selected compound (A) and a compound (B) force, a thermally decomposable organic compound (C), and a predetermined compound.
- the element (D) or a compound containing the element (D) may be mixed in an organic solvent, and the compound (E) may be further mixed with this solution for preparation.
- the compound (A) and (B) force at least one selected compound and the thermally decomposable organic compound (C) in an organic solvent are mixed with the element (D) or May be prepared by adding and mixing the compound containing the element (D) and then mixing the compound (E).
- An example of a method of preparing the porous membrane precursor composition solution will be specifically described below.
- the Si—OH bridge proceeds linearly to form a two-dimensional network structure, and the general formulas (1) and ( Hydrolysis of the compound shown in 2) may not be completed completely. Therefore, the power that can be considered to bring the pH of the hydrolysis system to the acidic side in order to promote hydrolysis.
- the final purpose of the present invention is to use the obtained porous film in a semiconductor device. Hydrolysis cannot be promoted by lowering the pH. Therefore, in the present invention, as described above, for example, the neutrality of the organic solvent (C) (for example, a surfactant) that exhibits neutrality below the vaporization temperature of the organic solvent, such as urea, is obtained.
- C organic solvent
- the compounds represented by the general formulas (1) and (2) in the precursor composition solution are thermally decomposed at a temperature lower than the decomposition temperature to produce a basic substance such as ammonia.
- the desired purpose is achieved by mixing the compound (E) capable of promoting the hydrolysis of in a desired step. That is, the compound (E) is a compound that thermally decomposes within a temperature range of 90 ° C. to 200 ° C. and generates amines by this thermal decomposition.
- the additive element (D) is added to and mixed with the mixed solution.
- element (D) alone Alternatively, the addition method and timing at which any of the compounds containing the element (D) may be added or mixed alone or in any combination are not particularly limited.
- each component may be added in order or all components may be added together and mixed.
- the mixing concentration is not particularly limited as long as it is not less than a concentration at which crosslinking of the silylated compound (hydrophobic compound) can be promoted during the silylation treatment and not more than a concentration at which sufficient insulation of the obtained film can be maintained. Absent. For example, a range of 50 to 5000 ppm is desirable.
- the finally obtained solution is stirred in the range of 20 to 50 ° C, preferably in the range of 25 to 30 ° C for 30 minutes to 24 hours to obtain a porous membrane precursor composition solution.
- a precursor solution obtained by further adding and mixing the above-described compound (E) such as urea to the precursor solution prepared by force is applied onto a substrate, and the thin film obtained is applied.
- the thermal decomposition temperature of this compound (E) amines serving as basic catalysts are generated, the unhydrolyzed portion in the precursor is completely hydrolyzed, and the basicity Si—OH three-dimensional crosslinking is also promoted. Accordingly, a porous silica film having a stronger silica network can be obtained.
- this compound (E) For example, if the process is performed as described above.
- the method of adding and treating the compound (E) as described above is generally called “homogeneous precipitation", but this method is used in the field of thin films, particularly in the field of porous thin films. There is no report using such a method.
- the amount of urea added is usually several tens to several hundreds times that in the present invention.
- the use of such a large amount of urea also damages the surface active agent and the like for pore formation, so that the ratio of the obtained porous membrane is finally obtained. It increases the dielectric constant.
- the range that does not affect the relative dielectric constant is, as will be apparent from the examples described below, the molar ratio with respect to 1 mol of Si atoms in the precursor composition, generally 0.03 to 0. 13 molarity.
- the compound (E) in order to improve the hydrophobicity of the porous membrane, the compound (E) is mixed.
- a solution of the precursor composition of the porous film or a solution of the precursor composition of the porous film mixed with the compound (E) prepared by the method for preparing the precursor composition is applied on a substrate, Dry in the temperature range of 100-400 ° C. Wavelength 157 ⁇ which is lower than Si—O bond energy and higher than Si—C bond energy for the porous film formed on this substrate!
- hydrophobic groups and polymerizable groups Forced hydrophobic compounds having at least one selected group, such as hydrophobic groups (for example, alkyl groups having 6 or less carbon atoms, A hydrophobic compound having at least one diaryl group) and a polymerizable group (for example, a hydrogen atom, an OH group, or a halogen atom) is subjected to a gas phase reaction in a temperature range of 100 to 600 ° C.
- hydrophobic groups for example, alkyl groups having 6 or less carbon atoms, A hydrophobic compound having at least one diaryl group
- a polymerizable group for example, a hydrogen atom, an OH group, or a halogen atom
- the firing temperature of porous silica was supposed to be 400 ° C, but in recent years, the requirement for processing semiconductor devices is that firing is possible at 350 ° C or below, and The firing atmosphere can be performed in an inert gas atmosphere such as nitrogen.
- ultraviolet rays having a wavelength of 157 nm to 344 nm having an energy lower than the Si—O bond energy and larger than the Si—C bond energy are irradiated to form an organic material.
- the silica wall is reinforced with a hydrophobic compound that is a silylated compound.
- the irradiation energy is not limited to ultraviolet rays.
- an electron beam accelerated to a desired energy state Etc. are also effective.
- the hydrophobic compound is introduced into the pores in the porous silica film in a gas phase state to form a hydrophobic polymer thin film on the inner wall of the pores.
- the existing element (D) is added to the membrane electrode. Dramatic acceleration of the gas-phase cross-linking reaction can be obtained by disturbing the gas neutrality and generating non-cross-linked oxygen in the oxide film of the porous film that is left uncrosslinked.
- this element acts like a so-called catalyst, it has low dielectric constant and high mechanical strength (improvement of elastic modulus and hardness by reinforcing the pore structure), which was impossible with conventional methods.
- a porous membrane with good hydrophobicity can be obtained.
- all heat treatment temperatures in the process can be lowered.
- a heat treatment at 400 ° C. which is generally performed, is performed at a low temperature baking treatment at 350 ° C. or lower. High mechanical strength can be obtained.
- the monovalent organic group of R, R 1 and R 2 includes an alkyl group, An aryl group, an aryl group, a glycidyl group and the like are included.
- Examples of the monovalent organic group in R 1 of the general formula (1) include an alkyl group and an aryl group.
- the alkyl group is preferably an alkyl group having 1 to 5 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, and a butyl group. These alkyl groups may be chained or branched, and a hydrogen atom may be replaced with a fluorine atom or the like.
- Examples of the aryl group include a phenyl group, a naphthyl group, a methylphenol group, an ethylphenol group, a black-and-white phenyl group, a bromophenol group, and a fluorophenol group.
- the monovalent organic group for R 1 an alkyl group and a phenyl group are preferable.
- Examples of the monovalent organic group in R and R 2 in the general formula (2) include the same organic groups as those in the case of R 1 in the general formula (1).
- alkoxysilanes represented by the general formulas (1) and (2) that can be used in the present invention are not particularly limited, and specific examples include the following. Can do.
- quaternary alkoxysilanes such as tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane, tetrabutylsilane; trimethoxyfluorosilane, triethoxyfluor Tertiary alkoxysilane such as fluorosilane, triisopropoxyfluorosilane, tributoxyfluorosilane;
- Fluorine-containing alkoxysilanes such as CH 2 CH 3 Si (OCH 2 CH 3);
- Tertiary alkoxyalkyl silanes such as trimethoxymethyl silane, triethoxymethyl silane, trimethoxyethyl silane, triethoxytyl silane, trimethoxy propyl silane, triethoxy propyl silane;
- Tertiary alkoxysilane silanes such as trimethoxyphenylsilane, triethoxyphenylsilane, trimethoxychlorosilane, and triethoxychlorosilane;
- Tertiary alkoxyphenethylsilane such as trimethoxyphenethylsilane and triethoxyphenethylsilane;
- Secondary alkoxyalkyl silanes such as dimethoxydimethylsilane and jetoxydimethylsilane can be exemplified.
- one or more selected from the above alkoxysilanes can be used in combination.
- Examples of the organic solvent that can be used in the present invention include methanol, ethanol, n Propanol, i-propanol, n-butanol, i-butanol, sec butanol, t-butanol, n-pentanol, i-pentanol, 2-methylbutanol, sec pentanol, t-pentanol, 3-methoxybutanol, n— Hexanol, 2 methyl pentanol, sec hexanol, 2-ethylenobutanol, sec heptanol, heptanol 1, n-octanol, 2 ethylhexanol, sec-octanol, n-nor alcohol, 2, 6 Dimethylheptanol-4, n-decanol, sec undecyl anolenoconole, trimethino lenenoleano
- Polyhydric alcohol solvents such as xylenediol 1,3, diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol, glycerin;
- Diethyleneglycololetinoleateol diethyleneglycololemonore- n- butinoreetherenore, diethyleneglycolenoresi n-butinoreethenore, diethyleneglycololemonore-n-hexyl ether, ethoxytriglycol, tetraethyleneglycolene n— Butenourenore, Propylene Glycolanol Monomethinoreate Nore, Propylene Glyconole Monoethyle Norenoatere, Propylene Glycol Monopropyl Ether, Propylene Glycol Monobutinoreether, Dipropylene Glycol Nole Monomethinole Ether, Dipropylene Glynole Monoethino Ether solvents such as ether, tripropylene glycolenomonomethylenoether, tetrahydrofuran, 2-methyltetrahydrofuran;
- Jetyl carbonate methyl acetate, ethyl acetate, ⁇ -butyrolatatone, ⁇ -valerolatatone, ⁇ -propyl acetate, i-propyl acetate, n-butyl acetate, i-butyl acetate, sec-butyl acetate, n-pentyl acetate, sec-pentyl acetate , 3-methoxybutyl acetate, methylpentyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, benzyl acetate, cyclohexyl acetate, methyl cyclohexyl acetate, n-nor acetate, methyl acetate acetate, acetyl acetate , Ethylene glycol monomethyl ether acetate, Ethylene glycol acetate Monore monoethylenoate
- system solvents examples thereof include system solvents.
- one or two or more selected from the above-mentioned organic solvent power can be used in combination.
- the catalyst that can be used in the precursor composition solution is at least one kind of acidic catalyst or basic catalyst.
- Examples of the acidic catalyst include inorganic acids and organic acids.
- Examples of the inorganic acid include hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, phosphoric acid, boric acid, and hydrobromic acid.
- organic acids include acetic acid, propionic acid, butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, oxalic acid, maleic acid, methylmalonic acid, adipic acid, Sebacic acid, gallic acid, butyric acid, melicic acid, arachidonic acid, shikimic acid, 2-ethylhexanoic acid, oleic acid, stearic acid, linoleic acid, linolenic acid, salicylic acid, benzoic acid, P-aminobenzoic acid, ⁇ Toluenesulfonic acid, benzenesulfonic acid, monochrome oral acetic acid, dichloroacetic acid, trichloro oral acetic acid, trifluoroacetic acid, formic acid, malonic acid, sulfonic acid,
- Examples of the basic catalyst include ammonia salts and nitrogen-containing compounds.
- ammonium salt examples include hydroxyammonium tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, and tetraptylammonium hydroxide.
- Examples of the nitrogen-containing compound include pyridine, pyrrole, piperidine, 1-methylpiperidine, 2-methylpiperidine, 3-methylpiperidine, 4-methylpiperidine, piperazine, 1-methylpiperazine. , 2-methylpiperazine, 1,4-dimethylpiperazine, pyrrolidine, 1 methylpyrrolidine, picoline, monoethanolamine, diethanolamine, dimethyl monoethanolamine, monomethyljetanolamine, triethanolamine, diazabi crootaten, Diazabicyclononane, diazabicycloundecene, 2-pyrazoline, 3-pyrophylline, quinuclidine, ammonia, methylamine, ethylamine, propylamine, butylamine, ⁇ , ⁇ dimethylamine, ⁇ , ⁇ jetylamine, ⁇ , ⁇ dipropylamine, ⁇ , ⁇ -Dibutylamine, trimethylamine, triethylamine, tripropylamine,
- any acid-basic compound containing the additive element (D) used in the present invention can also be used as a catalyst.
- the surfactant that can be used in the solution of the precursor composition in the present invention is a target in a gas phase reaction after the formation of vacancies where the vacancies formed are small when the molecular weight is small. It is difficult for the compound to penetrate into the vacancies sufficiently, and when the molecular weight is large, the vacancies formed are too large. It will never be done.
- Preferable examples include the following surfactants.
- a compound having a long-chain alkyl group and a hydrophilic group preferably has 8 to 24 carbon atoms, more preferably 12 to 18 carbon atoms, and the hydrophilic group includes, for example, quaternary ammonia. Salt, amino group, nitroso group, hydroxyl group, carboxyl group, etc., among which quaternary ammonium salt or hydroxy group is desirable.
- surfactants have the general formula:
- a is an integer from 0 to 2
- b is an integer from 0 to 4
- n is an integer from 8 to 24
- m is an integer from 0 to 12
- L is from 1 to 24 represents an integer of 24
- X represents a halide ion, HSO— or a monovalent organic cation.
- the vacancies formed will be of an appropriate size, and the target compound will be used in the gas phase reaction after vacancy formation. Sufficiently penetrates into the pores and the desired polymerization reaction occurs.
- (I) A compound having a polyalkylene oxide structure examples include a polyethylene oxide structure, a polypropylene oxide structure, a polytetramethylene oxide structure, and a polybutylene oxide structure.
- Specific examples of the compound having such a polyalkylene oxide structure include polyoxyethylene polyoxyethylene.
- Ether type compounds such as oxypropylene block copolymer, polyoxyethylene polyoxybutylene block copolymer, polyoxyethylene polyoxypropylene alkyl ether, polyethylene alkyl ether, polyoxyethylene alkyl ether, polyoxyethylene glycerin fatty acid
- ether ester compounds such as esters, polyoxyethylene sorbitan fatty acid esters, polyethylene sorbitol fatty acid esters, sorbitan fatty acid esters, propylene glycol fatty acid esters, and sucrose fatty acid esters.
- one or two or more selected from the above-mentioned surfactant power can be used in combination.
- the additive element (D) used in the present invention is SiO 2 from the viewpoint of promoting the gas phase polymerization reaction in the present invention.
- Si—o which is the basic skeleton of the porous membrane, increases non-bridging oxygen and promotes the gas phase polymerization reaction
- an element having a Pauling electronegativity greater than 1.8 of Si, such as oxygen is 3.5
- carbon has 2.5, a porous film with Si—O and, in some cases, Si—C bonds, having a higher electronegativity is more likely to have a covalent bond. It is not suitable for achieving the object of the present invention to increase the non-bridging oxygen by forming an ionic bond with the metal element and promote the catalytic action by the metal element.
- the metal element contained in the porous film has a property when it is stably present in the film regardless of what kind of stress, especially electrical stress is applied, or the porous film.
- a property that does not adversely affect elements other than the porous film in a semiconductor device is required. If the element contained at this time is a normal metal element, it adversely affects the performance of the semiconductor itself, which is not appropriate. However, even if it is an element that does not adversely affect the semiconductor, such as a metal, for example, if it is an amphoteric element such as Al, Zn, Sn, Pb, etc., there are already examples of use in semiconductor devices. Absent.
- Typical elements (D) that satisfy the above-described properties and can be used in the present invention include, for example, B, Al, P, Zn, Ga, Ge, As, Se, In, Sn, Sb, Te, Examples include Rb, Cs, Ba, La, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, Po, At, and lanthanoids.
- the group force consisting of Cs, Ba, lanthanoid, Hf, P, Pb, Bi ⁇ Po, Se, Te, As, Rb, Al, and Sn is at least one element selected. These elements should be present in at least one kind in the precursor composition of the porous membrane! /.
- the addition method there is no particular limitation on the addition method, whether it is an element itself or a compound containing the target element. Yes.
- This compound is not particularly limited.
- nitrate compounds, oxide compounds, organometallic compounds, basic compounds, and other known compounds that can form the metal element in the present invention may be used.
- Each element can be introduced.
- the compound is preferably introduced as a mixture of water and an organic solvent such as alcohol.
- the concentration of the additive element may be a catalytic amount, but as is clear from Reference Example 2 below, it is preferably 50 to 5000 ppm with respect to the solution of the precursor composition.
- the hydrophobic compound that can be used in the present invention includes a hydrophobic group composed of an alkyl group having 1 to 6 carbon atoms or an H group, and a polymerizable group consisting of a hydrogen atom, an OH group, or a halogen atomic energy.
- a compound having at least one functional group is preferred.
- the alkyl group include a methyl group, an ethyl group, a propyl group, and a butyl group. These alkyl groups may be chained or branched, and hydrogen atoms may be converted to fluorine atoms or the like. May be substituted.
- the halogen atom is selected from fluorine, chlorine, bromine and iodine.
- hydrophobic compound examples include 1,2 bis (tetramethyldisiloxale) ethane, 1,3 bis (trimethylsiloxy) 1,3 dimethyldisiloxane, 1, 1,3,3— Tetraisopropyldisiloxane, 1,1,3,3-tetraphenyldisiloxane, 1,1,3,3-tetraethyldisiloxane, 1,1,4,4-tetramethyldisylethylene, 1,1,3,3 , 5, 5 Hexamethyltrishi Loxane, 1,1, 3, 3, 5, 5 Hexaisopropyltrisiloxane, 1,1, 3, 3, 5, 5, 7,7 Otamethinoretetrasiloxane, 1, 1, 1,3, 5 , 5 Hexamethinoretrisiloxane, 1,1,1,3,3,5,7,7-Otamethyltetrasiloxane, 1,3 Dimethyltetramethoxydisiloxane, 1,1,3,3-Tetramethyl-1, 3 Die
- Hydrophobic I ⁇ product can be used in the present invention also provides, Si- X- Si bond unit (X is an oxygen atom, NR 3 group represents a CH group or a CH group, R 3 is CH group or CH group is represented by n 2n 6 4 m 2m + l 6 5, n is 1 or 2, m is an integer of 1 to 6) and Si—A bond unit (A is a hydrogen atom, OH group, OC H group or halogen atom, A b 2b + l in the same molecule
- B is an integer from 1 to 6.
- a cyclic siloxane can be used as the hydrophobic compound.
- examples of the cyclic siloxanes include the following general formula:
- R 4 and R 5 may be the same or different, respectively, hydrogen atom, CH group, CH
- 6 5 c represents a 2c group, a CF (CF) (CH) group, a halogen atom, c is an integer of 1 to 3, and d is 0 to 10
- E is an integer from 0 to 4
- n is an integer from 3 to 8.
- the cyclic siloxane compound represented by the above formula preferably has at least two Si—H bonds, and at least one of R 4 and R 5 is a hydrogen atom. Is also preferable. Even when such a cyclic siloxane is used, the hydrophobicity of the resulting porous silica film increases, and the dielectric constant decreases.
- cyclic siloxanes include tri (3,3,3 trifluoropropyl) trimethylcyclotrisiloxane, triphenyltrimethylcyclotrisiloxane, 1,3,5,7— Tetramethylcyclotetrasiloxane, Otamethylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetraphenylcyclotetrasiloxane, 1,3,5,7-tetraethylcyclo Examples thereof include tetrasiloxane and pentamethylcyclopentasiloxane.
- the cyclic siloxanes that can be used in the present invention can be used alone or in combination of two or more thereof. Of the above cyclic siloxanes, 1,3,5,7-tetramethylcyclotetrasiloxane is preferred.
- cyclic siloxanes may also have the following general formula:
- R 6 , R 7 , R 8 , R 9 , R 10 , R 11 may be the same or different, respectively, hydrogen atom, CH group, CH group, CF (CF) (CH) group Represents a halogen atom, and f is an integer of 1 to 3
- G is an integer from 0 to 10
- h is an integer from 0 to 4
- L is an integer from 0 to 8
- m is an integer from 0 to 8
- n is from 0 to 8 It is an integer, 3 ⁇ L + m + n ⁇ 8, and contains at least two Si—H bonds.
- at least one kind of cyclic siloxane compound represented by (1) Specifically, for example, 1,2,3,4,5,6 hexamethylcyclotrisiloxane, 1,3,5,7-tetraethyl-2,4,6,8-tetramethylcyclotetrasiloxane, Examples include 1,2,3-triethyl 2,4,6 triethylcyclotrisiloxane and the like.
- cyclic siloxane compound represented by the formula (wherein R 5 is as defined above).
- R 5 is as defined above.
- 1,3,5,7-tetramethylcyclotetra examples thereof include siloxane, 1,3,5,7-tetraethylcyclotetrasiloxane, 1,3,5,7-tetraphenyl cyclotetrasiloxane, and pentamethylcyclopentasiloxane.
- siloxane 1,3,5,7-tetraethylcyclotetrasiloxane
- 1,3,5,7-tetraphenyl cyclotetrasiloxane 1,3,5,7-tetraphenyl cyclotetrasiloxane
- pentamethylcyclopentasiloxane One or more of these can be used in combination.
- the hydrophobic compound may be in an amount sufficient to form a polymer thin film on the inner wall of the pore with respect to the raw material porous silica membrane.
- concentration in the gas is 0.1 lvol%. That's all.
- the substrate is not particularly limited, and examples thereof include glass, quartz, a silicon wafer, and stainless steel.
- the shape is not particularly limited, and may be any of a plate shape, a dish shape, and the like.
- the method for applying the solution of the precursor composition of the porous film to the substrate is not particularly limited, and examples thereof include general methods such as a spin coating method, a casting method, and a dip method. Can do.
- a spin coating method a substrate is placed on a spinner, a coating solution is dropped on the substrate, and the rotation speed is 500 to 10,000 rpm.
- the present invention it is possible to obtain a porous silica film excellent in low dielectric constant, hydrophobicity, and the like. Therefore, after the modified porous silica film is produced, the hydrophobization treatment may be further performed. Not necessary.
- the porous silica film after the gas phase reaction has almost no unpolymerized residue of the hydrophobic compound, but it was obtained even if there was an organic residue.
- another metal thin film, an insulating film or the like is laminated on the modified porous silica film, the adhesion between these films is improved by the unpolymerized residue.
- the inside of the chamber is once depressurized, and thereafter, the vapor of the hydrophobic compound is introduced, and this reduced pressure is maintained. Since a moderate polymerization reaction can be performed, the diffusibility of the hydrophobic compound into the chamber is improved, and the concentration in the pores becomes uniform.
- the modified porous silica film of the present invention is excellent in both dielectric constant and hydrophobicity and also in mechanical strength, so that it is a semiconductor such as an interlayer insulating film or an inter-wiring insulating film.
- Materials Can be used as optical functional materials and electronic functional materials such as molecular recording media, transparent conductive films, solid electrolytes, optical waveguides, and color members for LCDs.
- interlayer dielectric films and inter-wiring insulation films of semiconductor materials are required to have low dielectric constant, hydrophobicity and high mechanical strength. It is advantageous to use a superior modified porous silica membrane of the present invention.
- a modified porous silica film is formed on the substrate surface.
- a hard mask and a photoresist are formed on the modified porous silica film in accordance with known manufacturing process conditions, and etching is performed according to the pattern of the photoresist.
- a barrier film having titanium nitride (TiN) or tantalum nitride (TaN) isotropic force is formed on the surface of the porous silica film by vapor deposition (CVD).
- a barrier film is formed on the surface of the porous silica film of the present invention
- a copper wiring is formed by a metal CVD method, a sputtering method or an electrolytic plating method according to a known process condition, and further, a film is formed by CMP. Smooth.
- a cap film is formed on the surface of the film. Further, if necessary, a hard mask can be formed and the above-described steps can be repeated to make a multilayer, and the semiconductor device of the present invention can be manufactured.
- the application of the present invention is not limited to this application.
- surface processing in an aqueous solution is required. It can also be applied to applications such as waterproof membrane electrical materials, catalyst materials, and filter materials.
- Ananoloxysilanes tetraethoxysilane, dimethinoletoxysilane (manufactured by Yamanaka Semi-Conductor, electronics industry grade).
- H 2 O Deionized metal with a resistance of 18 ⁇ ⁇ or higher.
- Organic solvent ethanol (manufactured by Wako Pure Chemical Industries, electronics industry grade).
- Surfactant Poly (alkylene oxide) block copolymer, HO (CH CH O) (CH
- Additive element or element-containing compound manufactured by High Purity Chemical Laboratory.
- Silylating agent 1,3,5,7-tetramethylcyclotetrasiloxane (manufactured by Trichemical, electronic grade).
- Film thickness, refractive index Measured using spectroscopic ellipsometry (SOPRA, GES5).
- Dielectric constant Measured using a mercury probe measurement method (SSM2000, manufactured by SSM).
- TEOS Tetraethoxysilane O. 48 mol, H Ol. 6 mol, dimethyl jetoxysilane
- DMDEOS DMDEOS
- nonionic surfactant trade name: P45, average molecular weight: 230 0, OH (CH CH O) (CH (CH) CH O) (CH CH O) H) 0.1 mol
- P45 average molecular weight: 230 0, OH (CH CH O) (CH (CH) CH O) (CH CH O) H) 0.1 mol
- ethanol e.g., ethanol
- the amount of DMDEOS is not particularly limited.
- the pores of the porous film obtained by firing should be arranged in a two-dimensional hexagonal manner. X-ray diffraction peaks are observed, and it is difficult to obtain a wormhole-like hole structure.
- a semiconductor Si substrate was spin-coated at 1200 rpm, and then the substrate was baked at 400 ° C for 1 hour in an air atmosphere.
- the heating time to 400 ° C was 15 minutes.
- the temperature, temperature rise time and holding time are not particularly limited as long as the quality of the obtained porous membrane is within a range that does not impair the membrane performance. Yes.
- the porous membrane obtained as described above is subjected to 1, 3, 5, 7-tetramethylcyclotetrasiloxane (TMCTS) vapor in a pressure of 90 kPa at 400 ° C for 30 minutes.
- TMCTS 1, 3, 5, 7-tetramethylcyclotetrasiloxane
- N which is an inert gas as a carrier gas, and always flows during firing.
- Coating and baking were carried out in the same manner as in Reference Example 1 except that a solution obtained by adjusting and adding to the range of 5000 ppm was used.
- the obtained Cs-containing porous membrane was treated with TMCTS in the same manner as in Reference Example 1 to obtain a porous silica membrane.
- Table 1 shows the physical property values of the film obtained in this reference example.
- the concentration of the metal element is generally 0.1 ppm or more, preferably 1 ppm or more and 5000 ppm. The following is sufficient.
- Figure 1 shows the leakage current density (AZcm 2 ) measured for the film obtained when the Cs concentration was lOppm.
- Fig. 2 shows the cumulative frequency distribution (%) for the same film, with the withstand voltage (V (MVZcm)) measured for the same film.
- Fig. 3 shows the cumulative frequency distribution (%) when the leakage current density (AZcm 2 ) was measured for the film obtained when the Cs concentration was lOOppm
- Fig. 4 shows the withstand voltage (V (MVZcm) for the same film.
- the cumulative frequency distribution (%) is shown for Fig. 1 and
- Fig. 3 and Fig. 2 are compared with Fig. 4.
- Cs element is lOOppm
- the relative permittivity is not affected, but the electrical characteristics are affected. I understand.
- Elemental force La element is mixed with La O / H 2 O so that the concentration is OOOppm.
- the mixture of Tl (NO) / H 2 O is adjusted to a concentration of lOOOppm so that the concentration of T1 (NO) / H 2 O
- Coating and baking were carried out in the same manner as in Reference Example 1 except that a solution obtained by adding and adjusting to a concentration of ppm was used.
- Each obtained metal-containing porous membrane was treated with TMCTS in the same manner as in Reference Example 1 to obtain a porous silica membrane.
- Table 2 shows the physical properties (refractive index, relative dielectric constant, elastic modulus, and hardness) of the film obtained in this reference example.
- the concentration of metal elements is generally 0.1 ppm or more, preferably 1 ppm or more and 5000 ppm. The following is sufficient.
- the obtained porous membrane was irradiated with ultraviolet light having a wavelength of 172 nm under a pressure of about lPa in a nitrogen atmosphere at 350 ° C for 5 to 20 minutes, and then 1, 3, 5, 7—
- a porous silica film was formed by calcination in a vapor of tetramethylcyclotetrasiloxane (TMCTS) at 400 ° C for 30 minutes under a pressure of 90 kPa.
- TMCTS tetramethylcyclotetrasiloxane
- pores of the porous silica film having a low dielectric constant were covered with polymethylolsiloxane, which is a hydrophobic polymer thin film.
- TMCTS-treated film obtained as described above and the TMCTS-treated film were measured for refractive index, film thickness, and relative dielectric constant. Table 3 shows the results.
- TEOS Tetraethoxysilane O. 48 mol, H Ol. 6 mol, dimethyl jetoxysilane
- DMDEOS DMDEOS
- nonionic surfactant trade name: P45, average molecular weight: 230 0, OH (CH CH O) (CH (CH) CH O) (CH CH O) H) 0.1 mol
- P45 average molecular weight: 230 0, OH (CH CH O) (CH (CH) CH O) (CH CH O) H) 0.1 mol
- ethanol e.g., ethanol
- urea was further adjusted to an element ratio of 0 to 0.25 molar with respect to Si, and a coating solution was prepared.
- This coating solution was spin-coated on a semiconductor Si substrate at 1200 rpm, and then the substrate was dried and fired at 400 ° C for 1 hour in an air atmosphere to obtain a porous film.
- the heating time to 400 ° C was 15 minutes.
- the temperature, the temperature raising time, and the holding time are not particularly limited as long as the film quality of the obtained porous film is within a range that does not impair the film performance.
- the obtained porous membrane was irradiated with ultraviolet light having a wavelength of 172 nm under a pressure of about lPa at 350 ° C in a nitrogen atmosphere for 5 to 20 minutes, and then 1, 3, 5, 7—
- a porous silica film was formed by calcination in a vapor of tetramethylcyclotetrasiloxane (TMCTS) at 400 ° C for 30 minutes under a pressure of 90 kPa.
- TMCTS tetramethylcyclotetrasiloxane
- pores of the porous silica film having a low dielectric constant were covered with polymethylsiloxane, which is a hydrophobic polymer thin film.
- the TMCTS-treated film obtained and the TMCTS-treated film were measured for refractive index, film thickness, relative dielectric constant, elastic modulus and hardness of the film, Table 4 shows.
- Example 2 instead of the coating solution used in Example 1, the element ratio of urea to Si was compared to the solution obtained by adding a mixture of Cs (NO) / HO so that the Cs element would be 100 ppm. Coating and baking were carried out in the same manner as in Example 1 except that the coating solution obtained by adjusting the addition to 0.06 molar concentration was used. The obtained porous membrane was irradiated with ultraviolet rays in the same manner as in Example 1 and then treated with TMCTS to obtain a porous silica membrane.
- Example 1 the amount of surfactant in Example 1 was set to 1Z4, the mixture of Cs (NO s ) / HO was adjusted to 15 ppm of Cs element, and urea was mixed with Si. 0.03 in element ratio
- a coating solution prepared according to Example 1 was used so as to have a molar concentration. After spin coating using this solution on a semiconductor Si substrate at 1600 rpm, (1) the substrate is nitrided. Baking treatment was performed at 350 ° C for 1 hour in an atmosphere. In this case, the temperature raising time to 350 ° C. was 50 minutes, and after holding at 350 ° C. for 60 minutes, the temperature was lowered to room temperature and the substrate was taken out. (2) The extracted substrate was irradiated with ultraviolet light having a wavelength of 172 nm for 5 to 20 minutes under a pressure of about 1 Pa in a nitrogen atmosphere at 350 ° C in another apparatus, and then the temperature was lowered and the substrate was taken out.
- each metal-containing solution used in Reference Example 3 was used, and urea had an element ratio of 0.06 molar ratio to Si.
- Coating and baking are carried out according to Example 1 using the coating solution obtained by adding calorie as described above.
- the obtained porous film is irradiated with ultraviolet light in the same manner as in Example 1, and then treated with TMCTS to obtain a porous silicon film.
- the obtained film has improved electrical characteristics (leakage current density (A / cm 2 ) and withstand voltage (V (MV / cm)).
- a porous silica film having a low dielectric constant and a low refractive index, excellent mechanical strength, and improved water repellency can be provided.
- Semiconductor field Can be used as a low-refractive-index film in the field of low relative dielectric constant insulating film, display, and the like.
- FIG. 1 is a graph showing the relationship between leakage current density (AZcm 2 ) and cumulative frequency distribution (%) for a porous membrane with a Cs concentration of 10 ppm obtained in Reference Example 2.
- MVZcm is a graph showing the relationship between cumulative frequency distribution (%).
- FIG. 3 is a graph showing the relationship between the leakage current density (AZcm 2 ) and the cumulative frequency distribution (%) for the porous film with a Cs concentration of lOOppm obtained in Reference Example 2.
- MVZcm is a graph showing the relationship between cumulative frequency distribution (%).
- FIG. 5 shows the leakage current density (AZcm 2 ) and cumulative frequency distribution (%) for the porous film obtained in Example 3 with the urea addition amount obtained as 0.06 molar concentration in terms of the element ratio with Si.
- FIG. 6 Relationship between withstand voltage (V) and cumulative frequency distribution (%) for a porous membrane obtained with the urea addition amount obtained in Example 3 at an element ratio of 0.06 mol with respect to Si. Graph showing.
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- Formation Of Insulating Films (AREA)
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Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07743462A EP2025709A4 (en) | 2006-06-02 | 2007-05-16 | PREPARATION COMPOSITION FOR POROUS MEMBRANE, PROCESS FOR PREPARATION COMPOSITION, POROUS MEMBRANE, METHOD FOR PRODUCING THE POROUS MEMBRANE AND SEMICONDUCTOR DEVICE |
CN2007800276217A CN101490145B (zh) | 2006-06-02 | 2007-05-16 | 多孔膜的前体组合物及其制备方法、多孔膜及其制作方法、以及半导体装置 |
KR1020087031601A KR101105622B1 (ko) | 2006-06-02 | 2007-05-16 | 다공질막의 전구체 조성물 및 그 조제 방법, 다공질막 및 그 제조 방법, 그리고 반도체 장치 |
US12/303,240 US8394457B2 (en) | 2006-06-02 | 2007-05-16 | Precursor composition for porous thin film, method for preparation of the precursor composition, porous thin film, method for preparation of the porous thin film, and semiconductor device |
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JP2006-154846 | 2006-06-02 | ||
JP2006154846A JP5030478B2 (ja) | 2006-06-02 | 2006-06-02 | 多孔質膜の前駆体組成物及びその調製方法、多孔質膜及びその作製方法、並びに半導体装置 |
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WO2007142000A1 true WO2007142000A1 (ja) | 2007-12-13 |
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PCT/JP2007/060027 WO2007142000A1 (ja) | 2006-06-02 | 2007-05-16 | 多孔質膜の前駆体組成物及びその調製方法、多孔質膜及びその作製方法、並びに半導体装置 |
Country Status (7)
Country | Link |
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US (1) | US8394457B2 (ja) |
EP (1) | EP2025709A4 (ja) |
JP (1) | JP5030478B2 (ja) |
KR (1) | KR101105622B1 (ja) |
CN (1) | CN101490145B (ja) |
TW (1) | TWI412562B (ja) |
WO (1) | WO2007142000A1 (ja) |
Cited By (1)
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WO2009123104A1 (ja) * | 2008-04-02 | 2009-10-08 | 三井化学株式会社 | 組成物及びその製造方法、多孔質材料及びその形成方法、層間絶縁膜、半導体材料、半導体装置、並びに低屈折率表面保護膜 |
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- 2007-05-16 CN CN2007800276217A patent/CN101490145B/zh not_active Expired - Fee Related
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Cited By (6)
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WO2009123104A1 (ja) * | 2008-04-02 | 2009-10-08 | 三井化学株式会社 | 組成物及びその製造方法、多孔質材料及びその形成方法、層間絶縁膜、半導体材料、半導体装置、並びに低屈折率表面保護膜 |
JP2010090389A (ja) * | 2008-04-02 | 2010-04-22 | Mitsui Chemicals Inc | 組成物及びその製造方法、多孔質材料及びその形成方法、層間絶縁膜、半導体材料、半導体装置、並びに低屈折率表面保護膜 |
JP4598876B2 (ja) * | 2008-04-02 | 2010-12-15 | 三井化学株式会社 | 組成物の製造方法、多孔質材料及びその形成方法、層間絶縁膜、半導体材料、半導体装置、並びに低屈折率表面保護膜 |
JPWO2009123104A1 (ja) * | 2008-04-02 | 2011-07-28 | 三井化学株式会社 | 組成物の製造方法、多孔質材料及びその形成方法、層間絶縁膜、半導体材料、半導体装置、並びに低屈折率表面保護膜 |
KR101220029B1 (ko) | 2008-04-02 | 2013-01-21 | 미쓰이 가가쿠 가부시키가이샤 | 조성물 및 그 제조 방법, 다공질 재료 및 그 형성 방법, 층간 절연막, 반도체 재료, 반도체 장치, 및 저굴절률 표면 보호막 |
US8603588B2 (en) | 2008-04-02 | 2013-12-10 | Mitsui Chemicals, Inc. | Composition and method for production thereof, porous material and method for production thereof, interlayer insulating film, semiconductor material, semiconductor device, and low-refractive-index surface protection film |
Also Published As
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US8394457B2 (en) | 2013-03-12 |
CN101490145A (zh) | 2009-07-22 |
EP2025709A4 (en) | 2010-03-24 |
US20090186210A1 (en) | 2009-07-23 |
CN101490145B (zh) | 2012-04-18 |
KR101105622B1 (ko) | 2012-01-18 |
KR20090027675A (ko) | 2009-03-17 |
EP2025709A1 (en) | 2009-02-18 |
JP2007321092A (ja) | 2007-12-13 |
TWI412562B (zh) | 2013-10-21 |
JP5030478B2 (ja) | 2012-09-19 |
TW200804523A (en) | 2008-01-16 |
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