WO2010150861A1 - ポリシロキサン縮合反応物 - Google Patents
ポリシロキサン縮合反応物 Download PDFInfo
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- WO2010150861A1 WO2010150861A1 PCT/JP2010/060787 JP2010060787W WO2010150861A1 WO 2010150861 A1 WO2010150861 A1 WO 2010150861A1 JP 2010060787 W JP2010060787 W JP 2010060787W WO 2010150861 A1 WO2010150861 A1 WO 2010150861A1
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- condensation reaction
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- -1 polysiloxane Polymers 0.000 title claims abstract description 229
- 229920001296 polysiloxane Polymers 0.000 title claims abstract description 117
- 238000009833 condensation Methods 0.000 title claims abstract description 45
- 230000005494 condensation Effects 0.000 title claims abstract description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 116
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- 125000005843 halogen group Chemical group 0.000 claims abstract description 26
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 7
- 238000006482 condensation reaction Methods 0.000 claims description 206
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- 238000006243 chemical reaction Methods 0.000 claims description 59
- 238000004821 distillation Methods 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 37
- 238000004519 manufacturing process Methods 0.000 claims description 36
- 125000004432 carbon atom Chemical group C* 0.000 claims description 35
- 238000009835 boiling Methods 0.000 claims description 26
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- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 239000002612 dispersion medium Substances 0.000 description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
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- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 4
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- OHSYWAVRSCQMHG-UHFFFAOYSA-N methyl-[methyl(trimethylsilyloxy)-$l^{3}-silanyl]oxy-trimethylsilyloxysilicon Chemical compound C[Si](C)(C)O[Si](C)O[Si](C)O[Si](C)(C)C OHSYWAVRSCQMHG-UHFFFAOYSA-N 0.000 description 1
- ZIYVHBGGAOATLY-UHFFFAOYSA-N methylmalonic acid Chemical compound OC(=O)C(C)C(O)=O ZIYVHBGGAOATLY-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000001139 pH measurement Methods 0.000 description 1
- TWSRVQVEYJNFKQ-UHFFFAOYSA-N pentyl propanoate Chemical compound CCCCCOC(=O)CC TWSRVQVEYJNFKQ-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 229940090181 propyl acetate Drugs 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- RSNQKPMXXVDJFG-UHFFFAOYSA-N tetrasiloxane Chemical compound [SiH3]O[SiH2]O[SiH2]O[SiH3] RSNQKPMXXVDJFG-UHFFFAOYSA-N 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of 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; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
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- 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
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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
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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
- H01L21/02225—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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- 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
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- 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
- C08G77/02—Polysilicates
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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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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/016—Additives defined by their aspect ratio
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- 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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- 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
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/80—Constructional details
- H10K30/88—Passivation; Containers; Encapsulations
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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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31652—Of asbestos
- Y10T428/31663—As siloxane, silicone or silane
Definitions
- the present invention relates to a polysiloxane condensation reaction solution, and more particularly to a polysiloxane condensation reaction solution suitable for filling a trench formed in a semiconductor device, and more particularly to a trench filling suitable for an insulating protective film. Relates to a polysiloxane condensation reaction product solution.
- the present invention also relates to a method for producing the above polysiloxane condensation reaction product solution and the use of the polysiloxane condensation reaction solution.
- silicon oxide is widely and suitably used because high electrical insulation is required.
- a silicon oxide film is conventionally formed on a silicon substrate having a trench by a CVD method.
- the opening width tends to become narrower and the aspect ratio tends to increase. Therefore, when silicon oxide is buried in a trench having an opening width of 0.2 ⁇ m or less and an aspect ratio of 2 or more by CVD, voids (unfilled portions) or seams (seam-like unfilled portions) are formed in the trenches. ) Is likely to occur.
- a method is known in which fine grooves are embedded by a coating method and a silica film is formed by firing in an oxidizing atmosphere.
- materials used in this method polysilazane materials, polysilane materials, and silicone materials are known.
- the polysilane material has a problem that the applied polysilane compound is easily evaporated and cracks occur in the thick film (for example, Patent Document 2).
- the silicone material is accompanied by dehydration and dealcoholization condensation reactions when the coating film is baked, there is a problem that voids and cracks are generated in the obtained silicon oxide film.
- the density becomes non-uniform from the film surface toward the bottom of the trench because of the large shrinkage during conversion from the silicone material to the silicon oxide.
- Patent Document 3 As a method for avoiding the occurrence of voids and cracks using a silicone material, a composition comprising silica particles and a polysiloxane compound has been proposed (for example, Patent Document 3).
- the silica particles defined as the silicon oxide particles in Patent Document 3 and the polysiloxane compound defined as the silicon atom binder are only mixed, the pot life (storage stability at room temperature) of the solution is increased. There is a problem that it is bad, and there is a problem that voids are generated due to poor embedding in trenches having an opening width of 30 nm or less and an aspect ratio of 15 or more.
- Patent Documents 4 to 6 describe materials obtained by condensation reaction of silica particles and a polysiloxane compound.
- the materials described in Patent Documents 4 to 6 are materials designed for use as an interlayer insulating film. Since the embedding property in the trench is not required for the interlayer insulating film, these documents do not describe the embedding property in the trench.
- JP 2001-308090 A Japanese Patent Laid-Open No. 2003-31568 JP 2006-310448 A Japanese Patent No. 3320440 Japanese Patent No. 2851915 Japanese Patent No. 3163579
- Patent Documents 4 to 6 include examples of compounds having a silica particle ratio of 70% by mass or more, which are defined as silica sol. Since the particle ratio is high, it has been found that there is a problem that crack resistance and embedding in a trench are poor.
- An object of the present invention is to provide a condensation reaction product having a long pot life, a low shrinkage in curing when baked into silicon oxide, and excellent in crack resistance and HF resistance.
- the present invention further provides a condensation reaction product that can be suitably used for embedding in a trench having a narrow opening width and a high aspect formed in the substrate, and has a long pot life and good film formability and adhesion to the substrate. Therefore, it is possible to provide a condensation reaction product that has good embedding property in a trench when used for trench embedding, has a small shrinkage in curing when fired into silicon oxide, and is excellent in crack resistance and HF resistance. Objective.
- the present inventors have found that the condensation reaction product solution shown below has a long pot life and a small shrinkage in curing when baked into silicon oxide.
- the present inventors have found out that they are excellent in crack resistance and HF resistance, and in particular, found that they are useful as a composition for filling a trench due to good filling properties in the trench. That is, the present invention is as follows.
- the silane compound represented by the general formula (1) contains at least a tetrafunctional silane compound in which n is 0 in the general formula (1) and a trifunctional silane compound in which n is 1 in the general formula (1).
- a condensation reaction product solution which is two or more types of silane compounds.
- the condensation component contains a condensation conversion amount of the polysiloxane compound of 50% by mass to 90% by mass and 10% by mass to 50% by mass of the silica particles,
- the following general formula (2) in the polysiloxane compound SiX 2 4 (2) ⁇ Wherein X 2 is a halogen atom, an alkoxy group having 1 to 6 carbon atoms or an acetoxy group.
- the peak intensity (A) of all tetrafunctional siloxane components in the condensation reaction product and the peak intensity (B) of the component corresponding to the number of siloxane bonds in the condensation reaction product are 4 ⁇ (B) / (A) ⁇ ⁇ 0.50
- [6] The condensation reaction product solution according to any one of the above [1] to [5], which is used for filling a trench formed in a semiconductor element.
- [7] A method for producing the condensation reaction product solution according to any one of [1] to [6] above:
- a condensation component comprising a polysiloxane compound obtained in the first step in terms of a condensation conversion amount of 40% by mass to 99% by mass and silica particles of 1% by mass to 60% by mass is used as an alcohol having 1 to 4 carbon atoms.
- the condensation reaction product solution of the present invention has a long pot life, a small shrinkage in curing when fired into silicon oxide, excellent crack resistance and HF resistance, and when used for trench filling, into the trench. Excellent embeddability. Therefore, the condensation reaction product solution of the present invention is particularly suitable for embedding in a trench having a narrow opening width and a high aspect ratio formed in the substrate.
- Example 1 of the present invention It is a 29 SiNMR spectrum of Example 1 of the present invention. It is a 29 SiNMR spectrum of Comparative Example 3 of the present invention.
- the present invention relates to (i) the following general formula (1): R 1 n SiX 1 4-n (1) ⁇ Wherein n is an integer of 0 to 3, R 1 is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and X 1 is a halogen atom, an alkoxy group having 1 to 6 carbon atoms or An acetoxy group. ⁇
- the condensation component of the polysiloxane compound derived from the silane compound represented by the formula (ii) is condensed with a condensation component containing at least 40% by mass to 99% by mass and (ii) 1% by mass to 60% by mass of silica particles.
- a condensation reaction product solution that is two or more types of silane compounds containing at least a trifunctional silane compound in which n is 1.
- content in the condensation component described in this specification is when the total mass of all components in the condensation component (however, the amount of the polysiloxane compound and any silane compound is replaced with a condensation conversion amount) is 100% by mass. Is the amount.
- a condensation reaction in which a ratio of silica particles and a polysiloxane compound derived from two or more kinds of silane compounds is optimized is allowed to cause a thickening and an opening width. Narrow and high aspect ratio trench filling is possible.
- optimization of the composition of the condensation reaction product is effective for embedding the condensation reaction product without generating voids and seams in the trench, and more preferably, the viscosity of the condensation reaction product is reduced. We found that the reduction was effective. It was found that the viscosity can be lowered by optimizing the molecular weight of the condensation reaction product and the silanol group ratio of the Q structure.
- the condensation reaction product is represented by the above general formula (1), and a polysiloxane compound derived from two or more kinds of silane compounds containing at least a tetrafunctional silane compound and a trifunctional silane compound, and silica particles, have a predetermined composition. It is obtained by subjecting a condensation component contained in
- the polysiloxane compound used in the present invention is derived from the silane compound represented by the general formula (1). More specifically, the polysiloxane compound is a polycondensate of a silane compound represented by the general formula (1). Furthermore, the silane compound represented by the general formula (1) used in the present invention is a tetrafunctional silane compound in which n in the general formula (1) is 0 and n in the general formula (1) is 1. Two or more silane compounds containing at least a functional silane compound.
- R 1 in the general formula (1) include: methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, t-butyl, n-pentyl, iso-pentyl, neopentyl, cyclopentyl, Acyclic such as n-hexyl, iso-hexyl, cyclohexyl, n-heptyl, iso-heptyl, n-octyl, iso-octyl, t-octyl, n-nonyl, iso-nonyl, n-decyl, iso-decyl Or a cyclic aliphatic hydrocarbon group; acyclic and cyclic such as vinyl, propenyl, butenyl, pentenyl, hexenyl, cyclohexenyl, cyclohexenylethy
- R 1 includes a hydrogen atom.
- R 1 is preferably a hydrogen atom, a methyl group or an ethyl group in that a condensation reaction product having a small weight loss and a small shrinkage rate can be provided upon conversion to silicon oxide during firing. More preferably a methyl group.
- X 1 in the general formula (1) include, for example: halogen atoms such as chlorine, bromine and iodine; methoxy group, ethoxy group, n-propyloxy group, iso-propyloxy group, n-butyloxy group , T-butyloxy group, n-hexyloxy group, cyclohexyloxy group and other alkoxy groups; acetoxy group; and the like.
- halogen atoms such as chlorine, bromine and iodine
- alkoxy groups such as methoxy group and ethoxy group
- acetoxy group are preferable because of high reactivity of the condensation reaction.
- the polysiloxane compound contains a component derived from a tetrafunctional silane compound in which n in the general formula (1) is 0, film formability and adhesion to the substrate are improved, and the general formula (1) By including a component derived from a trifunctional silane compound in which n is 1, crack resistance and HF resistance are improved, and embedding is further improved.
- a polysiloxane compound derived from two or more kinds of silane compounds having the above specific composition by using a polysiloxane compound derived from two or more kinds of silane compounds having the above specific composition, a condensation reaction having both film formability, adhesion to a substrate, crack resistance and HF resistance, and embedding properties. A product solution is obtained. Below, the more preferable aspect of a tetrafunctional silane compound and a trifunctional silane compound is demonstrated.
- the following general formula (2) SiX 2 4 (2) ⁇
- X 2 is a halogen atom, an alkoxy group having 1 to 6 carbon atoms or an acetoxy group.
- the ratio of the component originating in the tetrafunctional silane compound represented by these is 5 mol% or more and 40 mol% or less.
- the structure of X 2 in the general formula (2) corresponds to the structure of X 1 in the general formula (1), and the structure of the general formula (2) is a part of the structure of the general formula (1). Represents.
- the proportion of the component derived from the tetrafunctional silane compound represented by the general formula (2) in the polysiloxane compound is 5 mol% or more, it is preferable because the film formability and the adhesion to the substrate are good,
- the ratio is more preferably 10 mol% or more.
- the ratio is 40 mol% or less, it is preferable because HF resistance is good, and the ratio is more preferably 35 mol% or less, and still more preferably 30 mol% or less.
- X 2 in the general formula (2) include, for example: halogen atoms such as chlorine, bromine and iodine; methoxy group, ethoxy group, n-propyloxy group, iso-propyloxy group, n-butyloxy group , Alkoxy groups such as t-butyloxy group, n-hexyloxy group and cyclohexyloxy group; acetoxy group and the like.
- halogen atoms such as chlorine, bromine and iodine
- alkoxy groups such as methoxy group and ethoxy group
- acetoxy group are preferable because of high reactivity of the condensation reaction.
- the condensation component used in the present invention contains a condensation conversion amount of the polysiloxane compound represented by the general formula (1) of 50% by mass to 90% by mass and 10% by mass to 50% by mass of silica particles. And the aspect whose ratio of the component originating in the tetrafunctional silane compound represented by the said General formula (2) in this polysiloxane compound is 5 mol% or more and 40 mol% or less is especially preferable.
- R 2 SiX 3 3 (3) wherein R 2 is a hydrocarbon group having 1 to 10 carbon atoms, and X 3 is a halogen atom, an alkoxy group having 1 to 6 carbon atoms or an acetoxy group. ⁇ It is preferable that the ratio of the component originating in the trifunctional silane compound represented by these is 60 mol% or more and 95 mol% or less.
- the structure of X 3 in the general formula (3) corresponds to X 1 in the general formula (1), and the structure of R 2 in the general formula (3) is the same as that in the general formula (1). 2 represents a part of R 1 .
- the structure of the general formula (3) represents a part of the structure of the general formula (1).
- the proportion of the component derived from the trifunctional silane compound represented by the general formula (3) in the polysiloxane compound is 60 mol% or more, the HF resistance and crack resistance are good and the embedding property is good.
- the ratio is more preferably 65 mol% or more, still more preferably 70 mol% or more.
- the ratio is 95 mol% or less, it is preferable because the film formability and the adhesion to the substrate are good, and the ratio is more preferably 90 mol% or less.
- R 2 in the general formula (3) include: methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, t-butyl, n-pentyl, iso-pentyl, neopentyl, cyclopentyl, Acyclic such as n-hexyl, iso-hexyl, cyclohexyl, n-heptyl, iso-heptyl, n-octyl, iso-octyl, t-octyl, n-nonyl, iso-nonyl, n-decyl, iso-decyl Or a cyclic aliphatic hydrocarbon group; acyclic and cyclic such as vinyl, propenyl, butenyl, pentenyl, hexenyl, cyclohexenyl, cyclohexenylethy
- X 3 in the general formula (3) include, for example: halogen atoms such as chlorine, bromine and iodine; methoxy group, ethoxy group, n-propyloxy group, iso-propyloxy group, n-butyloxy group , T-butyloxy group, n-hexyloxy group, cyclohexyloxy group and other alkoxy groups; acetoxy group; and the like.
- halogen atoms such as chlorine, bromine and iodine
- alkoxy groups such as methoxy group and ethoxy group
- acetoxy group are preferable because of high reactivity of the condensation reaction.
- the polysiloxane compound can be produced, for example, by a method of polycondensing the above silane compound in the presence of water. At this time, it is preferably 0.1 equivalents or more and 10 equivalents or less, more preferably 0.4 equivalents or more, based on the number of X 1 contained in the silane compound represented by the general formula (1) in an acidic atmosphere. Polycondensation is carried out in the presence of water in the range of 8 equivalents or less. When the amount of water is within the above range, it is preferable because the pot life of the condensation reaction product solution can be lengthened and the crack resistance after film formation can be improved.
- the reaction system is acidic by adding water for the condensation reaction. In order to show this, it does not matter whether or not an acid catalyst is used in addition to the silane compound.
- X 1 in the general formula (1) is an alkoxy group, it is preferable to add an acid catalyst.
- Examples of the acid catalyst include inorganic acids and organic acids.
- Examples of the inorganic acid include hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, phosphoric acid, and boric acid.
- Examples of the organic acid 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, benzoic acid, and p-aminobenzoic acid.
- Examples include acid, p-toluenesulfonic acid, benzenesulfonic acid, trifluoroacetic acid, formic acid, malonic acid, sulfonic acid, phthalic acid, fumaric acid, citric acid, tartaric acid, citraconic acid, malic acid, glutaric acid and the like.
- the above inorganic acids and organic acids can be used alone or in combination of two or more.
- the amount of the acid catalyst used is an amount that adjusts the pH of the reaction system for producing the polysiloxane compound to a range of 0.01 to 7.0, preferably 5.0 to 7.0. preferable. In this case, the weight average molecular weight of the polysiloxane compound can be controlled well.
- the polysiloxane compound can be produced in an organic solvent or a mixed solvent of water and an organic solvent.
- organic solvent include alcohols, esters, ketones, ethers, aliphatic hydrocarbons, aromatic hydrocarbon compounds, amide compounds, and the like.
- the alcohols include: monohydric alcohols such as methyl alcohol, ethyl alcohol, propyl alcohol, and butyl alcohol; polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, glycerin, trimethylolpropane, and hexanetriol; ethylene glycol monomethyl Ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, pro Glycol monopropyl ether, mono ethers of polyhydric alcohols such as propylene glycol monobutyl ether; and the like.
- monohydric alcohols such as methyl alcohol, ethyl alcohol, propyl alcohol, and but
- esters examples include methyl acetate, ethyl acetate, butyl acetate and the like.
- ketones examples include acetone, methyl ethyl ketone, and methyl isoamyl ketone.
- ethers in addition to the monoethers of the above polyhydric alcohols, for example: ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dipropyl ether, ethylene glycol dibutyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, Polyhydric alcohol ethers obtained by alkyl etherifying all hydroxyl groups of polyhydric alcohols such as propylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, and diethylene glycol diethyl ether; tetrahydrofuran, 1,4-dioxane, anisole and the like.
- Examples of the aliphatic hydrocarbons include hexane, heptane, octane, nonane and decane.
- aromatic hydrocarbons examples include benzene, toluene, xylene and the like.
- amide compounds examples include dimethylformamide, dimethylacetamide, N-methylpyrrolidone and the like.
- alcohol solvents such as methanol, ethanol, isopropanol, butanol, ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, ethylene glycol monomethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl Ether solvents such as ether and amide compound solvents such as dimethylformamide, dimethylacetamide and N-methylpyrrolidone are preferred because they are easy to mix with water and disperse silica particles easily.
- ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, ethylene glycol monomethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl Ether solvents such as ether and amide compound solvents such as dimethylformamide, dimethylacetamide and
- the polysiloxane compound can be produced by hydrolysis polycondensation in an aqueous alcohol solution under weakly acidic conditions of pH 5 or more and less than 7.
- solvents may be used alone or in combination of plural kinds of solvents. Moreover, you may react in a bulk, without using the said solvent.
- the reaction temperature for producing the polysiloxane compound is not particularly limited, but it is preferably -50 ° C or higher and 200 ° C or lower, more preferably 0 ° C or higher and 150 ° C or lower. By performing the reaction in the above temperature range, the molecular weight of the polysiloxane compound can be easily controlled.
- the content of the polysiloxane compound in the condensation component is set to be 40% by mass or more and 99% by mass or less in terms of the condensation conversion amount of the polysiloxane compound.
- the polycondensation amount of the polysiloxane compound means that X 1 remaining in the polysiloxane compound (X 1 is as defined above for the general formula (1)) is 1 ⁇ 2 It means the amount obtained by replacing with oxygen atoms.
- the condensation conversion amount of 40% by mass or more is preferable from the viewpoint of good film formability and trench embeddability.
- the condensation conversion amount is more preferably 50% by mass or more, and still more preferably 55% by mass or more.
- the amount in terms of condensation is 99% by mass or less because a low shrinkage rate and good crack resistance can be obtained.
- the condensation conversion amount is more preferably 90% by mass or less, and still more preferably 85% by mass or less.
- silica particles examples of the silica particles used in the present invention include fumed silica and colloidal silica.
- the fumed silica can be obtained by reacting a compound containing a silicon atom with oxygen and hydrogen in the gas phase.
- silicon compound used as a raw material include silicon halide (for example, silicon chloride).
- the colloidal silica can be synthesized by a sol-gel method in which a raw material compound is hydrolyzed and condensed.
- a raw material compound for colloidal silica examples include alkoxy silicon (for example, tetraethoxysilane) and halogenated silane compounds (for example, diphenyldichlorosilane).
- alkoxy silicon for example, tetraethoxysilane
- halogenated silane compounds for example, diphenyldichlorosilane.
- the colloidal silica obtained from the alkoxy silicon is more preferable.
- the average primary particle diameter of the silica particles is preferably 1 nm or more and 120 nm or less, more preferably 40 nm or less, still more preferably 20 nm or less, and most preferably 15 nm or less.
- the average primary particle size is 1 nm or more, the crack resistance is good, and when it is 120 nm or less, the embedding property in the trench is good.
- the average secondary particle diameter of the silica particles is preferably 2 nm or more and 250 nm or less, more preferably 80 nm or less, still more preferably 40 nm or less, and most preferably 30 nm or less.
- the average secondary particle size is 2 nm or more, the crack resistance is good, and when the average secondary particle size is 250 nm or less, the embedding property in the trench is good.
- the average secondary particle diameter of the silica particles is within the above range and 0.1 to 3 times the minimum opening width of the trenches formed in the substrate. It is preferable in terms of goodness, and more preferably 0.1 to 2 times the minimum opening width.
- the average primary particle size is a value obtained by calculation from the specific surface area of BET, and the average secondary particle size is a value measured with a dynamic light scattering photometer.
- the shape of the silica particles can be spherical, rod-like, plate-like, fiber-like, or a combination of two or more of these, but preferably spherical.
- the term “spherical” as used herein includes not only true spheres, but also spheres such as spheroids and ovals.
- the specific surface area of the silica particles is preferably a BET specific surface area of 25 m 2 / g or more, more preferably 70 m 2 / g or more, still more preferably 140 m 2 / g or more, in view of good HF resistance. Preferably it is 180 m 2 / g or more.
- the BET specific surface area is a value measured by a method calculated from the pressure of N 2 molecules and the gas adsorption amount.
- the silica particles are not limited as long as they meet the above requirements, and commercially available products can also be used.
- colloidal silica such as LEVASIL series (manufactured by HC Starck), methanol silica sol, IPA-ST, MEK-ST, NBA-ST, XBA-ST, DMAC-ST, ST-UP.
- Silica particles can also be used in a form dispersed in a dispersion medium.
- the content in that case is calculated using a value obtained by multiplying the mass of the net silica particles, that is, the mass of the dispersion by the concentration of the silica particles.
- the content of silica particles in the condensation component is 1% by mass or more and 60% by mass or less.
- the content of 1% by mass or more is preferable in that a low shrinkage rate and good crack resistance can be obtained.
- the content is more preferably 10% by mass or more, and still more preferably 15% by mass or more.
- the content of 60% by mass or less is preferable from the viewpoint of good film formability and trench embeddability.
- the content is more preferably 50% by mass or less, and still more preferably 45% by mass or less.
- the condensation component used in the production of the condensation reaction product used in the present invention can be composed of the above polysiloxane compound and silica particles, or can contain other components.
- a silane compound represented by the general formula (1) can be used as the other component.
- the following two-stage condensation reaction can be employed. That is, a polysiloxane compound and silica particles are first subjected to a condensation reaction by a method of adding a polysiloxane compound solution to a dispersion in which silica particles are dispersed in a solvent to cause a condensation reaction (first step). Next, the silane compound represented by the general formula (1) is further reacted with the obtained reaction solution (second stage).
- the silane compound represented by the general formula (1) used as the condensation component may be one kind or plural kinds. When using a plurality of types of silane compounds, for example, in the second stage, they may be added to the reaction system one by one sequentially, or after mixing a plurality of types of silane compounds into the reaction system. Also good.
- the content of the silane compound in the condensation component is more than 0% by mass and 40% by mass or less in terms of the condensation conversion amount of the silane compound. It is preferable to set so.
- the condensation conversion amount of the silane compound means an amount obtained by substituting X 1 in the general formula (1) with 1/2 oxygen atom. It is preferable that the condensation conversion amount exceeds 0% by mass because the pot life of the condensation reaction product solution is long.
- the condensation conversion amount is more preferably 0.01% by mass or more, and still more preferably 0.03% by mass or more.
- the condensation conversion amount is 40% by mass or less from the viewpoint of good crack resistance.
- the condensation conversion amount is more preferably 30% by mass or less, and still more preferably 20% by mass or less.
- Q0 to Q4 component amounts corresponding to 0 to 4 siloxane bonds can be obtained from 29 Si NMR analysis of a solution or solid, respectively.
- all tetrafunctional siloxane components in the condensation reaction product that is, a component having a siloxane bond number of 0 (Q0 component), a component having a siloxane bond number of 1 (Q1 component) ), A component corresponding to two siloxane bonds (Q2 component), a component corresponding to three siloxane bonds (Q3 component), and a component corresponding to four siloxane bonds (Q4 component))
- the ratio of the peak intensity (A) to the peak intensity (B) of the component corresponding to four siloxane bonds in the condensation reaction product ie, Q4 component
- the ratio is more preferably ⁇ (B) / (A) ⁇ ⁇ 0.6, and further preferably ⁇ (B) / (A) ⁇ ⁇ 0.7.
- the condensation reaction product has few terminal groups such as silanol groups and alkoxy groups, so that the curing shrinkage ratio is small, the trench embedding property is good, and the pot life of the condensation reaction product solution is Long preferred.
- the peak intensity of each Q component is calculated from the peak area.
- the weight average molecular weight of the condensation reaction product is preferably 1,000 or more and 20,000 or less, and more preferably 1,000 or more and 10,000 or less.
- the weight average molecular weight is a value calculated using gel permeation chromatography and calculated in terms of standard polymethyl methacrylate.
- the molecular weight can be measured by using, for example, a gel permeation chromatography (GPC), HLC-8220, TSKgelGMH HR -M column manufactured by Tosoh, and using a 1% by mass solution of the condensation reaction product in an acetone solvent.
- GPC gel permeation chromatography
- HLC-8220 HLC-8220
- TSKgelGMH HR -M column manufactured by Tosoh
- RI rate meter
- the condensation reaction product solution of the present invention contains a solvent.
- the solvent include at least one solvent selected from alcohols, ketones, esters, ethers, and hydrocarbon solvents, and esters, ethers, and hydrocarbon solvents are more preferable. Moreover, it is preferable that the boiling point of these solvents is 100 degreeC or more and 200 degrees C or less.
- the content of the solvent in the condensation reaction product solution of the present invention is preferably 100 parts by mass or more and 1900 parts by mass or less, more preferably 150 parts by mass or more and 900 parts by mass or less with respect to 100 parts by mass of the condensation reaction product. When the content of the solvent is 100 parts by mass or more, the pot life of the condensation reaction product solution is long, and when it is 1900 parts by mass or less, the trench embedding property is favorable, which is preferable.
- alcohol, ketone, ester, ether, and hydrocarbon solvent include butanol, pentanol, hexanol, octanol, methoxyethanol, ethoxyethanol, propylene glycol monomethoxy ether, propylene glycol monoethoxy ether, and the like.
- Alcohol solvents methyl ethyl ketone, methyl isobutyl ketone, isoamyl ketone, ethyl hexyl ketone, cyclopentanone, cyclohexanone, ⁇ -butyrolactone and other ketone solvents, butyl acetate, pentyl acetate, hexyl acetate, propyl propionate, butyl propionate, Ester solvents such as pentyl propionate, hexyl propionate, propylene glycol monomethyl ether acetate, ethyl lactate, butyl ether Ether solvents such as ether, butyl propyl ether, dibutyl ether, anisole, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, propylene glycol dimethyl ether, propylene glycol monomethyl ether, propylene glycol diethyl ether, and hydrocarbon solvents such as to
- At least one solvent selected from alcohols, ketones, esters, ethers and hydrocarbon solvents having a boiling point of 100 ° C. or more and 200 ° C. or less is 50 mass of the total solvent contained in the condensation reaction product solution. % Or more is preferable.
- a solvent having a boiling point of 100 ° C. or lower may be mixed in the condensation reaction product solution.
- one or more solvents selected from alcohols, ketones, esters, ethers and hydrocarbon solvents having a boiling point of 100 ° C. or higher and 200 ° C. or lower constitute 50% by mass or more of the total solvent, the pot life of the condensation reaction product solution Is preferable because the film thickness is long and the film formability is good.
- R 1 n SiX 1 4-n (1) A preferred method for producing the above-described condensation reaction product solution of the present invention will be described below.
- Another aspect of the present invention is a method for producing the condensation reaction product solution of the present invention described above, The following general formula (1): R 1 n SiX 1 4-n (1) ⁇ Wherein n is an integer of 0 to 3, R 1 is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and X 1 is a halogen atom, an alkoxy group having 1 to 6 carbon atoms or An acetoxy group.
- Two types of silane compounds represented by general formula (1) containing at least a tetrafunctional silane compound in which n is 0 and a trifunctional silane compound in which n is 1 in general formula (1)
- the process of A method comprising:
- the solvent can be added or present in the reaction system at any timing in either or both of the first step and the second step. Further, after the second step, a third step of further adding a solvent can be optionally included. In the third step, after the addition of the solvent, for example, a solvent replacement treatment for removing a solvent having a boiling point of 100 ° C. or lower and water may be performed.
- silane compound represented by the general formula (1) As the silane compound represented by the general formula (1), The following general formula (2): SiX 2 4 (2) ⁇ Wherein X 2 is a halogen atom, an alkoxy group having 1 to 6 carbon atoms or an acetoxy group. ⁇ 5 mol% or more and 40 mol% or less of a tetrafunctional silane compound represented by the following general formula (3): R 2 SiX 3 3 (3) ⁇ Wherein R 2 is a hydrocarbon group having 1 to 10 carbon atoms, and X 3 is a halogen atom, an alkoxy group having 1 to 6 carbon atoms or an acetoxy group. ⁇ A silane compound in combination with 60 to 95 mol% of the trifunctional silane compound represented by the formula can be used.
- the first step can be performed by the method described in detail in the section on the production of the polysiloxane compound.
- the reaction when the silica particles are subjected to a condensation reaction with the polysiloxane compound, the reaction can be advanced using silica particles dispersed in a solvent.
- This solvent can be water or an organic solvent or a mixed solvent thereof.
- the type of organic solvent present in the reaction system during the condensation reaction varies depending on the dispersion medium in which the silica particles used are dispersed.
- the aqueous dispersion obtained by adding water and / or alcohol solvent to the silica particles may be reacted with the polysiloxane compound, or the aqueous dispersion of silica particles After the water contained in is replaced with an alcohol solvent, the alcohol dispersion of the silica particles may be reacted with the polysiloxane compound.
- the alcohol solvent that can be used is preferably an alcohol solvent having 1 to 4 carbon atoms, such as methanol, ethanol, n-propanol, 2-propanol, n-butanol, methoxyethanol, ethoxyethanol and the like. These are preferable because they can be easily mixed with water.
- the silica particle dispersion medium used is a solvent such as alcohol, ketone, ester, or hydrocarbon
- water or a solvent such as alcohol, ether, ketone, or ester is used as a solvent to be present in the reaction system during the condensation reaction.
- the alcohol include methanol, ethanol, n-propanol, 2-propanol, and n-butanol.
- the ether include dimethoxyethane.
- the ketone include acetone, methyl ethyl ketone, and methyl isobutyl ketone.
- the ester include methyl acetate, ethyl acetate, propyl acetate, ethyl formate, propyl formate and the like.
- the second step can be performed in an aqueous alcohol solution having 1 to 4 carbon atoms.
- the pH within the above range is preferable because the weight average molecular weight of the condensation reaction product and the silanol group ratio of the Q component can be easily controlled.
- the condensation reaction between the polysiloxane compound and the silica particles is usually performed in the presence of an acid catalyst.
- an acid catalyst the same acid catalyst as mentioned above as what is used for manufacture of a polysiloxane compound can be mentioned.
- the acid catalyst is not removed after the production of the polysiloxane compound.
- the silica particles are reacted as they are, the polysiloxane compound and the silica particles can be reacted with the acid catalyst used when the polysiloxane compound is reacted without adding the acid catalyst again.
- an acid catalyst may be added again during the reaction between the polysiloxane compound and the silica particles.
- the reaction temperature between the polysiloxane compound and the silica particles is preferably 0 ° C. or higher and 200 ° C. or lower, more preferably 50 ° C. or higher and 150 ° C. or lower.
- the reaction temperature is within the above range, it is preferable because the weight average molecular weight of the condensation reaction product and the silanol group ratio of the Q component can be easily controlled.
- the condensation reaction between the polysiloxane compound and the silica particles is carried out in an aqueous alcohol solution having 1 to 4 carbon atoms at a temperature of 50 ° C. or higher under conditions of pH 6 to 8.
- the condensation reaction in the second step, after the condensation reaction (first stage) between the polysiloxane compound and the silica particles, the condensation reaction is generated.
- the product can be further reacted with a silane compound (second stage).
- the silane compound may be added neat or once diluted with a solvent.
- the solvent for dilution for example, alcohol-based, ether-based, ketone-based, ester-based, hydrocarbon-based, halogenated solvent and the like are used.
- the silane compound represented by the general formula (1) is preferably added to the reaction system in a concentration range of 1% by mass to 100% by mass (100% by mass in the case of neat), The concentration is more preferably 3% by mass or more and 50% by mass or less. When the concentration is within the above range, it is preferable because the amount of solvent used in the production of the condensation reaction product is small.
- a reaction product of a polysiloxane compound and silica particles is formed in the first stage, and subsequently, in the second stage, the silane compound represented by the general formula (1) is introduced into the reaction system. It is preferably added and reacted in the range of ⁇ 50 ° C. to 200 ° C. for 1 minute to 100 hours.
- the reaction temperature and the reaction time it is possible to control the viscosity of the condensation reaction product solution when forming the condensation reaction product, and when the reaction temperature and the reaction time are within the above ranges, The viscosity can be controlled within a particularly suitable range for film formation.
- the pH of the reaction solution after the condensation reaction (reaction between the polysiloxane compound and the silica particles or the reaction between the polysiloxane compound, the silica particles, and the silane compound) to 6 or more and 8 or less.
- the pH can be adjusted, for example, by removing the acid by distillation after the condensation reaction.
- the pot life of the condensation reaction product solution is preferably long.
- a solvent selected from alcohols, ketones, esters, ethers and hydrocarbon solvents (preferably having a boiling point of 100 ° C. or higher and 200 ° C. or lower) is subjected to a condensation reaction (reaction between a polysiloxane compound and silica particles, or a polysiloxane compound. Or the silica particles and the silane compound) may be added in advance, or after the condensation reaction, the third step may be provided or added at the timing of the both. May be.
- alcohol, ketone, ester, ether, and carbonization are added to the concentrate obtained by removing the solvent used in the condensation reaction by a method such as distillation.
- a solvent having a boiling point of 100 ° C. or higher and 200 ° C. or lower selected from hydrogen-based solvents may be further added.
- Solvent (especially organic solvent) used in the condensation reaction in the second step reaction of polysiloxane compound and silica particles, or reaction of polysiloxane compound, silica particles and silane compound
- the alcohol produced at this time has a boiling point lower than a solvent having a boiling point of 100 ° C. or more and 200 ° C. or less selected from the group consisting of alcohol, ketone, ester, ether and hydrocarbon solvent, during the condensation reaction or after the condensation reaction.
- a solvent having a boiling point of 100 ° C. or higher and 200 ° C. or lower selected from alcohols, ketones, esters, ethers and hydrocarbon solvents and then remove the low boiling point solvent by a method such as distillation.
- the pot life of the condensation reaction product solution can be increased.
- the reaction solution after the condensation reaction has at least one boiling point of 100 ° C. or more and 200 ° C. or less selected from the group consisting of alcohols, ketones, esters, ethers and hydrocarbon solvents.
- the solvent After adding the solvent, components having a boiling point of 100 ° C. or lower are distilled off.
- solvent replacement with a high boiling point solvent can be performed.
- a component having a boiling point of 100 ° C. or lower for example, when the first step and / or the second step are performed in a hydroalcoholic aqueous solution or in an alcohol having a boiling point of 100 ° C. or lower, water, or a boiling point of 100 ° C. or lower And alcohol.
- the condensation reaction reaction between polysiloxane compound and silica particles, or reaction between polysiloxane compound, silica particles and silane compound
- the above-mentioned after the condensation reaction After adding the solvent in the manner as described above, water and alcohol having a boiling point of 100 ° C. or lower are removed by a method such as distillation, and components having a boiling point of 100 ° C. or lower in the condensation reaction product solution (that is, water and alcohol having a boiling point of 100 ° C. or lower)
- the content of is preferably 1% by mass or less. When the content is in the above range, the pot life of the condensation reaction product solution is preferably long.
- purification may be performed to remove ions.
- Examples of the method for removing ions include ion exchange with an ion exchange resin, ultrafiltration, and distillation.
- a preferred embodiment of the present invention is a method for producing the condensation reaction product solution of the present invention, comprising: The following general formula (2): SiX 2 4 (2) ⁇ Wherein X 2 is a halogen atom, an alkoxy group having 1 to 6 carbon atoms or an acetoxy group. ⁇ 5 mol% or more and 40 mol% or less of a tetrafunctional silane compound represented by the following general formula (3): R 2 SiX 3 3 (3) ⁇ Wherein R 2 is a hydrocarbon group having 1 to 10 carbon atoms, and X 3 is a halogen atom, an alkoxy group having 1 to 6 carbon atoms or an acetoxy group.
- a condensation component comprising a polysiloxane compound obtained in the first step in terms of a condensation conversion amount of 40% by mass to 99% by mass and silica particles of 1% by mass to 60% by mass is used as an alcohol having 1 to 4 carbon atoms.
- the fluidity of the condensation reaction solution is low.
- the low fluidity is evaluated by the viscosity at 25 ° C. at a solid content concentration of 50 mass% of the condensation reaction product solution.
- the solid content concentration of the condensation reaction product solution means the concentration of the compound having Si atoms present in the solution.
- the solid content concentration can be measured by a method of measuring the weight before and after baking the condensation reaction product solution at 600 ° C. in a nitrogen atmosphere.
- the viscosity value at 25 ° C. means a value when the viscosity value is stabilized (variation is 2% or less) using an E-type viscometer.
- the viscosity at 25 ° C. when the solid content concentration of the condensation reaction product solution is 50% by mass is preferably 500 mPa ⁇ s or less.
- the viscosity is more preferably 200 mPa ⁇ s or less, still more preferably 100 mPa ⁇ s or less, and particularly preferably 70 mPa ⁇ s or less.
- the viscosity is in the above range, the filling property into the trench is good, which is preferable.
- the viscosity is preferably 70 mPa ⁇ s or less.
- the condensation reaction product solution of the present invention is suitably used, for example, for filling trenches formed in semiconductor elements.
- Another aspect of the present invention includes an application step of applying the above-described condensation reaction product solution of the present invention on a substrate to obtain a coated substrate, and a baking step of heating the coated substrate obtained in the coating step.
- a method for forming a film is provided.
- the condensation reaction product solution produced by the method as described above can be applied on the substrate by a usual method.
- the coating method include spin coating, dip coating, roller blade coating, and spray coating. Among them, the spin coating method is preferable in that the coating thickness during film formation is uniform.
- the substrate examples include a silicon (Si) substrate.
- the substrate may have a trench structure.
- the condensation reaction product solution when applied to a substrate having a trench structure by, for example, a spin coating method, it may be applied at a single rotational speed or a combination of multiple rotational speeds.
- the number of times of application of the condensation reaction product may be one or more, but it is more preferable to apply it once from the viewpoint of good film formability and manufacturing cost.
- a coated substrate can be obtained by the procedure as described above.
- the coated substrate is heated in the firing step.
- pre-curing is performed in the range of 50 ° C. to 200 ° C. in order to remove the residual solvent in the coating film.
- the temperature may be raised stepwise or continuously.
- the pre-curing atmosphere may be an oxidizing atmosphere or a non-oxidizing atmosphere.
- An insulating film can be obtained by heating and baking the film obtained by pre-curing.
- general heating means such as a hot plate, an oven, and a furnace can be applied. Heating and baking are preferably performed in a non-oxidizing atmosphere.
- the preferable heating temperature is preferably more than 200 ° C. and 850 ° C. or less, more preferably more than 300 ° C. and 800 ° C. or less, still more preferably more than 350 ° C. and 750 ° C. or less.
- the heating temperature is over 200 ° C., the resulting film quality is good, which is preferable, and when it is 850 ° C. or lower, the crack resistance is good, which is preferable.
- the non-oxidizing atmosphere is an inert atmosphere such as N 2 , Ar, or Xe under vacuum.
- concentration of an oxidizing gas such as oxygen or water vapor in the inert atmosphere is preferably 1000 ppm or less, more preferably 100 ppm or less, and still more preferably 10 ppm or less.
- limiting in particular in the total pressure of non-oxidizing atmosphere Any of pressurization, a normal pressure, and pressure reduction may be sufficient.
- the baking step in a gas containing hydrogen.
- the gas containing hydrogen used in the firing process may be introduced from the beginning of the firing process, that is, from the time when the substrate is still at a temperature of 700 ° C. or lower, or may be introduced after reaching 700 ° C.
- the first heating may be performed once at a temperature of 700 ° C. or more and 900 ° C. or less without using hydrogen, and then the second heating may be performed by introducing a gas containing hydrogen.
- the firing step is performed in a gas containing hydrogen, dangling bonds that are generated are terminated with hydrogen even if the chemical bond between the silicon atom and the organic group is cut at a high temperature exceeding 700 ° C. Therefore, the formation of silanol groups can be prevented.
- the heat treatment time in the firing step is preferably 1 minute to 24 hours, more preferably 30 minutes to 2 hours.
- heat firing in an oxidizing atmosphere and light treatment may be used in combination.
- the temperature when heating and light treatment are simultaneously performed is preferably 20 ° C. or more and 600 ° C. or less, and the treatment time is preferably 0.1 minutes or more and 120 minutes or less.
- light treatment visible light, ultraviolet light, far ultraviolet light, or the like can be used.
- low pressure or high pressure mercury lamp for the light treatment, low pressure or high pressure mercury lamp; deuterium lamp; discharge light of rare gas such as argon, krypton, xenon; YAG laser, argon laser, carbon dioxide laser, XeF, XeCl, XeBr, KrF, KrCl, An excimer laser such as ArF or ArCl; or the like can be used as a light source.
- These light sources preferably have an output of 10 to 5,000 W.
- the wavelength of light from these light sources is not limited as long as the condensation reaction product in the film applied to the substrate has any absorption, but it is preferably light having a wavelength of 170 nm to 600 nm.
- Irradiation amount is preferably 0.1 ⁇ 1,000J / cm 2, more preferably 1 ⁇ 100J / cm 2.
- Ozone may be generated simultaneously with the light treatment. For example, by performing the light treatment under the above conditions, the oxidation reaction of the condensation reaction product in the film applied to the substrate proceeds, and the film quality after baking can be improved.
- the surface of the insulating film may be exposed to a hydrophobizing agent.
- the silanol group in the insulating film formed in the baking step reacts with the hydrophobizing agent, and the surface of the insulating film can be hydrophobized.
- hydrophobizing agent known ones can be used, and for example, hexamethyldisilazane, diacetoxydisilazane, dihydroxydimethylsilane, halogenated organic silane and the like can be used. Cyclic siloxanes, organosilicon compounds, and cyclic silazanes can also be used.
- cyclic siloxane examples include, for example, (3,3,3-trifluoropropyl) methylcyclotrisiloxane, triphenyltrimethylcyclotrisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, octamethylcyclo Examples thereof include tetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetraphenylcyclotetrasiloxane, tetraethylcyclotetrasiloxane, and pentamethylcyclopentasiloxane.
- organosilicon compound examples include, for example, 1,2-bis (tetramethyldisiloxanyl) ethane, 1,3-bis (trimethylsiloxy) -1,3-dimethyldisiloxane, 1,1,3, 3-tetraisopropyldisiloxane, 1,1,3,3-tetramethyldisiloxane, 1,1,3,3-tetraethyldisiloxane, 1,1,3,3-tetraphenyldisiloxane, 1,1,4 , 4-tetramethyldisylethylene, 1,1,3,3,5,5-hexamethyltrisiloxane, 1,1,3,3,5,5-hexaethyltrisiloxane, 1,1,3,3 , 5,5-hexaisopropyltrisiloxane, 1,1,3,3,5,5,7,7-octamethyltetrasiloxane, 1,1,1,3,5,5-hexamethyltrisiloxane, 1, , ,
- cyclic silazane examples include 1,2,3,4,5,6-hexamethylcyclotrisilazane, 1,3,5,7-tetraethyl-2,4,6,8-tetramethylcyclotetra
- examples thereof include cyclic silazane compounds such as silazane and 1,2,3-triethyl-2,4,6-triethylcyclotrisilazane.
- hydrophobizing agents can be used alone or in combination of two or more.
- a method for exposing the surface of the insulating film to the hydrophobizing agent a method of applying the hydrophobizing agent to the surface of the insulating film in a liquid phase, a method of bringing the hydrophobizing agent into a gas phase and contacting the surface of the insulating film, etc. are applied. can do.
- a combination of the hydrophobic treatment agent and an organic solvent may be used.
- an organic silicon compound is combined with an organic solvent and applied to the surface of the insulating film in a liquid phase.
- the concentration of the organosilicon compound is not particularly limited and can be carried out at an arbitrary concentration.
- concentration There are no particular restrictions on the temperature and time for application in the liquid phase, but preferably 0 ° C. or more and 100 ° C. or less, more preferably 20 ° C. or more and 80 ° C. or less, preferably 0.1 minutes or more and 30 minutes or less, more Preferably it is 0.2 minutes or more and 10 minutes or less.
- the hydrophobizing agent When the hydrophobizing agent is brought into contact with the insulating film surface in the gas phase, the hydrophobizing agent is preferably diluted with gas.
- the gas for dilution include air, nitrogen, argon, hydrogen and the like. Further, instead of diluting with gas, contact under reduced pressure is also possible.
- the temperature and time when the hydrophobizing agent is brought into contact with the insulating film surface in the gas phase are not particularly limited, but are preferably 0 ° C. or higher and 500 ° C. or lower, more preferably 20 ° C. or higher and 400 ° C. or lower, preferably 0 .1 minutes to 30 minutes, more preferably 0.2 minutes to 10 minutes.
- Dehydration can be performed by heat-treating the insulating film in dry air or in an inert atmosphere.
- the temperature of the heat treatment is preferably 250 ° C. or higher and 850 ° C. or lower, more preferably 300 ° C. or higher and 850 ° C. or lower.
- the heat treatment time is preferably from 0.1 minute to 2 hours, more preferably from 0.2 minute to 1 hour. When the temperature is 250 ° C. or higher, moisture adsorbed on the insulating film can be removed well.
- the present inventors have optimized the ratio of the silica particles and the polysiloxane compound and the ratio of the components of the polysiloxane compound, thereby increasing the pot life and
- the inventors have invented a condensation reaction product solution that has good embeddability in the trench, has a low cure shrinkage when fired into silicon oxide, and is excellent in crack resistance and HF resistance. That is, in a particularly preferred embodiment, it is preferable that the condensation component used in the present invention contains a condensation conversion amount of the polysiloxane compound of 50% by mass to 90% by mass and 10% by mass to 50% by mass of silica particles.
- the above ratio is preferably 10% by mass or more from the viewpoint of low shrinkage rate and good crack resistance, and 50% by mass or less is preferable from the viewpoint of good film formability and trench embedding.
- the polysiloxane compound is derived from the component 10 mol% or more and 40 mol% or less derived from the tetrafunctional silane compound represented by the general formula (2) and the trifunctional silane compound represented by the general formula (3). It is particularly preferable that the component consists of 60 mol% or more and 90 mol% or less.
- the ratio of the component derived from the trifunctional silane compound is 60 mol% or more from the viewpoint of good HF resistance, crack resistance, and embedding property, and that it is 90 mol% or less is the film forming property and the substrate. It is preferable in terms of good adhesion.
- the insulating film obtained by using the condensation reaction product solution of the present invention includes an interlayer insulating film for electronic parts such as a liquid crystal display element, an integrated circuit element, a semiconductor memory element, and a solid-state imaging element, an element isolation film, an STI (Shallow). It is suitable for an insulating film for trench isolation, a PMD (Pre Metal Dielectric) film, a planarizing film, a surface protective film, a sealing film, and the like.
- a PMD Pre Metal Dielectric
- Viscosity measurement of a condensation reaction product solution with a solid content concentration of 50% by mass Condensation reaction product solution with a known concentration is concentrated with an evaporator to a solid content concentration of 50% by mass, and the temperature of the condensation reaction product solution after concentration is 25 ° C. or less. Viscosity was measured within 5 minutes. Place 1.1 ml of a sample with a solid content of 50% by mass into a sample cup of a viscometer (E-type viscometer (RE-85R type, manufactured by Toki Sangyo Co., Ltd., cone rotor: 1 ° 34 ' ⁇ R24)) The rotor was rotated at various rotation speeds. A value was obtained when the viscosity value was stable (when the variation was 2% or less).
- E-type viscometer RE-85R type, manufactured by Toki Sangyo Co., Ltd., cone rotor: 1 ° 34 ' ⁇ R24
- AAA or 10 or less trenches have voids or seams. AA or more than 10 and 100 or less trenches or seams. A, B when voids or seams exist in more than 100 trenches.
- Example 1 In a four-necked 500 mL flask having a distillation tower and a dropping funnel, 47.6 g of PL-06L (water dispersion silica particles having an average primary particle size of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries) and 80 g of ethanol are placed. The mixture was stirred for 5 minutes, and the polysiloxane compound synthesized in Production Example 1 was added dropwise thereto at room temperature. After completion of dropping, the mixture was stirred for 30 minutes and then refluxed for 4 hours.
- PL-06L water dispersion silica particles having an average primary particle size of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries
- Example 2 In a four-necked 500 mL flask having a distillation tower and a dropping funnel, PL-06L (water-dispersed silica particles having an average primary particle diameter of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries) and 6Og of ethanol were added. The mixture was stirred for 5 minutes, and the polysiloxane compound synthesized in Production Example 2 was added dropwise thereto at room temperature. After completion of dropping, the mixture was stirred for 30 minutes and then refluxed for 4 hours.
- PL-06L water-dispersed silica particles having an average primary particle diameter of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries
- PGMEA propylene glycol methyl ethyl acetate
- Example 3 In a four-necked 500 mL flask having a distillation tower and a dropping funnel, PL-06L (water-dispersed silica particles having an average primary particle diameter of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries) and 6Og of ethanol were added. The mixture was stirred for 5 minutes, and the polysiloxane compound synthesized in Production Example 3 was added dropwise thereto at room temperature. After completion of dropping, the mixture was stirred for 30 minutes and then refluxed for 4 hours.
- PL-06L water-dispersed silica particles having an average primary particle diameter of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries
- PGMEA propylene glycol methyl ethyl acetate
- Example 4 Into a four-necked 500 mL flask having a distillation tower and a dropping funnel, 33.3 g of PL-1 (water dispersion silica particles having an average primary particle diameter of 15 nm and a concentration of 12% by mass manufactured by Fuso Chemical Industries) and 80 g of ethanol were placed. The mixture was stirred for minutes, and the polysiloxane compound synthesized in Production Example 4 was added dropwise thereto at room temperature. After completion of dropping, the mixture was stirred for 30 minutes and then refluxed for 4 hours.
- PL-1 water dispersion silica particles having an average primary particle diameter of 15 nm and a concentration of 12% by mass manufactured by Fuso Chemical Industries
- PGMEA propylene glycol methyl ethyl acetate
- Example 5 In a four-necked 500 mL flask having a distillation column and a dropping funnel, 23.8 g of PL-06L (water dispersion silica particles having an average primary particle diameter of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries) and 80 g of ethanol were placed. The mixture was stirred for 5 minutes, and the polysiloxane compound synthesized in Production Example 5 was added dropwise thereto at room temperature. After completion of dropping, the mixture was stirred for 30 minutes and then refluxed for 4 hours.
- PL-06L water dispersion silica particles having an average primary particle diameter of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries
- PGMEA propylene glycol methyl ethyl acetate
- Example 6 Into a four-necked 500 mL flask having a distillation tower and a dropping funnel, 41.7 g of PL-1 (water dispersion silica particles having an average primary particle diameter of 15 nm and a concentration of 12% by mass manufactured by Fuso Chemical Industries) and 80 g of ethanol were added. The mixture was stirred for minutes, and the polysiloxane compound synthesized in Production Example 6 was added dropwise thereto at room temperature. After completion of dropping, the mixture was stirred for 30 minutes and then refluxed for 4 hours.
- PL-1 water dispersion silica particles having an average primary particle diameter of 15 nm and a concentration of 12% by mass manufactured by Fuso Chemical Industries
- PGMEA propylene glycol methyl ethyl acetate
- Example 7 In a four-necked 500 mL flask having a distillation tower and a dropping funnel, 15.9 g of PL-06L (water dispersion silica particles having an average primary particle size of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries) and 80 g of ethanol were placed. The mixture was stirred for 5 minutes, and the polysiloxane compound synthesized in Production Example 7 was added dropwise thereto at room temperature. After completion of dropping, the mixture was stirred for 30 minutes and then refluxed for 4 hours.
- PL-06L water dispersion silica particles having an average primary particle size of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries
- PGMEA propylene glycol methyl ethyl acetate
- Example 8 In a four-necked 500 mL flask having a distillation tower and a dropping funnel, 47.6 g of PL-06L (water dispersion silica particles having an average primary particle size of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries) and 80 g of ethanol are placed. The mixture was stirred for 5 minutes, and the polysiloxane compound synthesized in Production Example 8 was added dropwise thereto at room temperature. After completion of dropping, the mixture was stirred for 30 minutes and then refluxed for 4 hours.
- PL-06L water dispersion silica particles having an average primary particle size of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries
- PGMEA propylene glycol methyl ethyl acetate
- Example 9 In a four-necked 500 mL flask having a distillation tower and a dropping funnel, 47.6 g of PL-06L (water dispersion silica particles having an average primary particle diameter of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries) and 80 g of ethanol were placed. The mixture was stirred for 5 minutes, and the polysiloxane compound synthesized in Production Example 9 was added dropwise thereto at room temperature. After completion of dropping, the mixture was stirred for 30 minutes and then refluxed for 4 hours.
- PL-06L water dispersion silica particles having an average primary particle diameter of 6 nm and a concentration of 6.3% by mass manufactured by Fuso Chemical Industries
- PGMEA propylene glycol methyl ethyl acetate
- PGMEA propylene glycol methyl ethyl acetate
- PGMEA propylene glycol methyl ethyl acetate
- PGMEA propylene glycol methyl ethyl acetate
- PGMEA propylene glycol methyl ethyl acetate
- a PGMEA solution of a polysiloxane compound obtained by substituting 15 g of AD-1003 (isopropanol-dispersed silica particles having an average primary particle diameter of 7 nm and a concentration of 20% by mass made by Catalyst Chemical Industries) with PGMEA After mixing and stirring for 5 minutes, a PGMEA solution having a solid content concentration of 20% by mass was obtained.
- AD-1003 isopropanol-dispersed silica particles having an average primary particle diameter of 7 nm and a concentration of 20% by mass made by Catalyst Chemical Industries
- the insulating film obtained by using the condensation reaction product solution of the present invention includes an interlayer insulating film for an electronic component such as a liquid crystal display element, an integrated circuit element, a semiconductor memory element, a solid-state imaging element, an element isolation film, and an STI insulating film. , PMD (Pre Metal Dielectric) film, planarization film, surface protective film, sealing film and the like.
- PMD Pre Metal Dielectric
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Abstract
Description
しかしながら、特許文献3で酸化シリコン粒子と定義されるシリカ粒子とシリコン原子バインダーと定義されるポリシロキサン化合物とは混合されているだけであるため、溶液のポットライフ(室温での保存安定性)が悪いという問題があり、また開口幅30nm以下であり、かつアスペクト比が15以上のトレンチへの埋め込み性が悪く、ボイドが発生するといった問題があった。
R1 nSiX1 4-n (1)
{式中、nは、0~3の整数であり、R1は、水素原子又は炭素数1~10の炭化水素基であり、X1は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表されるシラン化合物に由来するポリシロキサン化合物の縮合換算量40質量%以上99質量%以下と、(ii)シリカ粒子1質量%以上60質量%以下と、を少なくとも含有する縮合成分を縮合反応させて得られる縮合反応物、及び
(II)溶媒
を含み、
該一般式(1)で表されるシラン化合物が、一般式(1)中のnが0である4官能シラン化合物及び一般式(1)中のnが1である3官能シラン化合物を少なくとも含有する2種類以上のシラン化合物である、縮合反応物溶液。
[2] 該縮合成分が、該ポリシロキサン化合物の縮合換算量50質量%以上90質量%以下と該シリカ粒子10質量%以上50質量%以下とを含有し、
該ポリシロキサン化合物中の、下記一般式(2):
SiX2 4 (2)
{式中、X2は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される4官能シラン化合物に由来する成分の割合が、5mol%以上40mol%以下である、上記[1]に記載の縮合反応物溶液。
[3] 該ポリシロキサン化合物中の、下記一般式(3):
R2SiX3 3 (3)
{式中、R2は、炭素数1~10の炭化水素基であり、X3は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される3官能シラン化合物に由来する成分の割合が、60mol%以上95mol%以下である、上記[1]又は[2]に記載の縮合反応物溶液。
[4] 29SiNMR分析における、該縮合反応物中の全4官能シロキサン成分のピーク強度(A)と、該縮合反応物中のシロキサン結合数4つに相当する成分のピーク強度(B)とが
{(B)/(A)}≧0.50
の関係を満たす、上記[1]~[3]のいずれかに記載の縮合反応物溶液。
[5] 該縮合反応物の重量平均分子量が、1,000以上20,000以下である、上記[1]~[4]のいずれかに記載の縮合反応物溶液。
[6] 半導体素子に形成されたトレンチの埋め込み用途に使用される、上記[1]~[5]のいずれかに記載の縮合反応物溶液。
[7] 上記[1]~[6]のいずれかに記載の縮合反応物溶液を製造する方法であって:
下記一般式(2):
SiX2 4 (2)
{式中、X2は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される4官能シラン化合物5mol%以上40mol%以下と、下記一般式(3):
R2SiX3 3 (3)
{式中、R2は、炭素数1~10の炭化水素基であり、X3は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される3官能シラン化合物60mol%以上95mol%以下とからなるシラン化合物を、アルコール水溶液中、pH5以上7未満の弱酸性条件で加水分解重縮合して、ポリシロキサン化合物を得る第1の工程と、
該第1の工程で得たポリシロキサン化合物の縮合換算量40質量%以上99質量%以下と、シリカ粒子1質量%以上60質量%以下と、からなる縮合成分を、炭素数1~4のアルコール水溶液中、pH6~8の条件下、50℃以上の温度で縮合反応させて、反応液を得る第2の工程と、
該第2の工程で得た反応液に、アルコール、ケトン、エステル、エーテル及び炭化水素系溶媒からなる群から選ばれる少なくとも1種類の沸点100℃以上200℃以下の溶媒を加えた後、蒸留により沸点100℃以下の成分を留去することによって、縮合反応物溶液を得る第3の工程と
を含む、方法。
[8] 上記[1]~[6]のいずれかに記載の縮合反応物溶液を基板上に塗布して塗布基板を得る塗布工程と、
該塗布工程で得た塗布基板を加熱する焼成工程と
を含む、絶縁膜の形成方法。
[9] 該基板がトレンチ構造を有する、上記[8]に記載の絶縁膜の形成方法。
本発明は、(i)下記一般式(1):
R1 nSiX1 4-n (1)
{式中、nは、0~3の整数であり、R1は、水素原子又は炭素数1~10の炭化水素基であり、X1は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}で表されるシラン化合物に由来するポリシロキサン化合物の縮合換算量40質量%以上99質量%以下と、(ii)シリカ粒子1質量%以上60質量%以下と、を少なくとも含有する縮合成分を縮合反応させて得られる縮合反応物、及び(II)溶媒を含み、該一般式(1)で表されるシラン化合物が、一般式(1)中のnが0である4官能シラン化合物及び一般式(1)中のnが1である3官能シラン化合物を少なくとも含有する2種類以上のシラン化合物である、縮合反応物溶液を提供する。なお本明細書で記載する縮合成分中の含有量は、縮合成分における全成分合計質量(但し、ポリシロキサン化合物及び任意のシラン化合物の量については縮合換算量に置き換える)を100質量%としたときの量である。
縮合反応物は、上記一般式(1)で表され、4官能シラン化合物及び3官能シラン化合物を少なくとも含有する2種類以上のシラン化合物に由来するポリシロキサン化合物と、シリカ粒子と、を所定の組成で含有する縮合成分を縮合反応させて得られる。
本発明において使用されるポリシロキサン化合物は、上記一般式(1)で表されるシラン化合物に由来する。より具体的には、該ポリシロキサン化合物は、上記一般式(1)で表されるシラン化合物の重縮合物である。更に、本発明で用いる、一般式(1)で表されるシラン化合物は、一般式(1)中のnが0である4官能シラン化合物及び一般式(1)中のnが1である3官能シラン化合物を少なくとも含有する2種類以上のシラン化合物である。
SiX2 4 (2)
{式中、X2は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される4官能シラン化合物に由来する成分の割合は、5mol%以上40mol%以下であることが好ましい。なお上記一般式(2)中のX2の構造は上記一般式(1)中のX1の構造に対応しており、一般式(2)の構造は一般式(1)の構造の一部を表している。ポリシロキサン化合物中の、一般式(2)で表される4官能シラン化合物に由来する成分の割合が5mol%以上である場合、成膜性及び基板への密着性が良好であるため好ましく、該割合はより好ましくは10mol%以上である。一方、該割合が40mol%以下である場合、HF耐性が良好であるため好ましく、該割合はより好ましくは35mol%以下、更に好ましくは30mol%以下である。
R2SiX3 3 (3)
{式中、R2は、炭素数1~10の炭化水素基であり、X3は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される3官能シラン化合物に由来する成分の割合は、60mol%以上95mol%以下であることが好ましい。なお上記一般式(3)中のX3の構造は上記一般式(1)中のX1に対応しており、上記一般式(3)中のR2の構造は上記一般式(1)中のR1の一部の態様を表している。すなわち一般式(3)の構造は一般式(1)の構造の一部を表している。ポリシロキサン化合物中の、一般式(3)で表される3官能シラン化合物に由来する成分の割合が60mol%以上である場合、HF耐性及びクラック耐性が良好であるとともに埋め込み性が良好であるため好ましく、該割合はより好ましくは65mol%以上、更に好ましくは70mol%以上である。一方、該割合が95mol%以下である場合、成膜性及び基板への密着性が良好であるため好ましく、該割合はより好ましくは90mol%以下である。
ポリシロキサン化合物は、例えば上記したシラン化合物を水の存在下で重縮合させる方法により製造できる。このとき、酸性雰囲気下、上記一般式(1)で表されるシラン化合物に含有されるX1の数に対して、好ましくは0.1当量以上10当量以下、より好ましくは0.4当量以上8当量以下の範囲で水を存在させて重縮合を行う。水の存在量が上記の範囲内である場合、縮合反応物溶液のポットライフを長くし、成膜後のクラック耐性を向上させることができるため好ましい。
本発明において使用されるシリカ粒子としては、例えばヒュームドシリカ、コロイダルシリカ等が挙げられる。
本発明において用いる縮合反応物の製造の際に用いる縮合成分は、上記のポリシロキサン化合物及びシリカ粒子からなることもできるし、他の成分を含むこともできる。他の成分としては、例えば上記一般式(1)で表されるシラン化合物を使用できる。この場合、例えば以下の2段階の縮合反応を採用できる。すなわち、シリカ粒子を溶媒中に分散させた分散体にポリシロキサン化合物溶液を加えて縮合反応させる方法等によって、ポリシロキサン化合物とシリカ粒子とをまず縮合反応させる(第1段階)。次いで、得られた反応液に、上記一般式(1)で表されるシラン化合物を更に反応させる(第2段階)。縮合成分として使用される上記一般式(1)で表されるシラン化合物は1種類でもよいし複数種でもよい。複数種のシラン化合物を使用する場合には、例えば上記の第2段階において、1種類ずつ順次反応系中に加えてもよいし、複数種のシラン化合物を混合させてから反応系中に加えてもよい。
シリカ粒子、及び上記一般式(1)で表されるシラン化合物のうちn=0の(すなわち上記一般式(2)で表される)4官能シラン化合物に由来する4官能シロキサン成分をQ成分とすると、溶液又は固体の29SiNMR分析より、シロキサン結合数が0~4にそれぞれ相当するQ0~Q4成分量を求めることができる。本発明においては、29SiNMR分析における、縮合反応物中の全4官能シロキサン成分(すなわち、シロキサン結合数が0に相当する成分(Q0成分)、シロキサン結合数が1つに相当する成分(Q1成分)、シロキサン結合数が2つに相当する成分(Q2成分)、シロキサン結合数が3つに相当する成分(Q3成分)、及びシロキサン結合数が4つに相当する成分(Q4成分)の合計)のピーク強度(A)と、該縮合反応物中のシロキサン結合数4つに相当する成分(すなわちQ4成分)のピーク強度(B)との比が、{(B)/(A)}≧0.50の関係を満たすことが好ましい。上記比は、より好ましくは{(B)/(A)}≧0.6であり、更に好ましくは{(B)/(A)}≧0.7である。上記比が上記範囲内である場合、縮合反応物中の、シラノール基、アルコキシ基等の末端基が少ないため、硬化収縮率が小さく、トレンチ埋め込み性が良好で、縮合反応物溶液のポットライフが長く好ましい。なお、各Q成分のピーク強度はピーク面積から算出する。
本発明の縮合反応物溶液は溶媒を含有する。溶媒としては、例えば、アルコール、ケトン、エステル、エーテル、及び炭化水素系溶媒から選ばれる少なくとも1種類の溶媒が挙げられ、エステル、エーテル、及び炭化水素系溶媒がより好ましい。また、これらの溶媒の沸点は100℃以上200℃以下であることが好ましい。本発明の縮合反応物溶液中の溶媒の含有量は、縮合反応物100質量部に対して、好ましくは100質量部以上1900質量部以下、より好ましくは150質量部以上900質量部以下である。溶媒の上記含有量が100質量部以上である場合、縮合反応物溶液のポットライフが長く、1900質量部以下である場合、トレンチ埋め込み性が良好であるため好ましい。
上述した本発明の縮合反応物溶液の好ましい製造方法について以下に説明する。
本発明の別の態様は、上述した本発明の縮合反応物溶液を製造する方法であって、
下記一般式(1):
R1 nSiX1 4-n (1)
{式中、nは、0~3の整数であり、R1は、水素原子又は炭素数1~10の炭化水素基であり、X1は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表されるシラン化合物であって、該一般式(1)中のnが0である4官能シラン化合物及び一般式(1)中のnが1である3官能シラン化合物を少なくとも含有する2種類以上のシラン化合物、を加水分解重縮合して、ポリシロキサン化合物を得る第1の工程と、
該第1の工程で得たポリシロキサン化合物の縮合換算量40質量%以上99質量%以下と、シリカ粒子1質量%以上60質量%以下と、を少なくとも含有する縮合成分を縮合反応させる、第2の工程と、
を含む方法を提供する。
下記一般式(2):
SiX2 4 (2)
{式中、X2は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される4官能シラン化合物5mol%以上40mol%以下と、下記一般式(3):
R2SiX3 3 (3)
{式中、R2は、炭素数1~10の炭化水素基であり、X3は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される3官能シラン化合物60mol%以上95mol%以下との組合せのシラン化合物を使用できる。
下記一般式(2):
SiX2 4 (2)
{式中、X2は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される4官能シラン化合物5mol%以上40mol%以下と、下記一般式(3):
R2SiX3 3 (3)
{式中、R2は、炭素数1~10の炭化水素基であり、X3は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される3官能シラン化合物60mol%以上95mol%以下とからなるシラン化合物を、アルコール水溶液中、pH5以上7未満の弱酸性条件で加水分解重縮合して、ポリシロキサン化合物を得る第1の工程と、
該第1の工程で得たポリシロキサン化合物の縮合換算量40質量%以上99質量%以下と、シリカ粒子1質量%以上60質量%以下と、からなる縮合成分を、炭素数1~4のアルコール水溶液中、pH6~8の条件下、50℃以上の温度で縮合反応させて、反応液を得る第2の工程と、
該第2の工程で得た反応液に、アルコール、ケトン、エステル、エーテル及び炭化水素系溶媒からなる群から選ばれる少なくとも1種類の沸点100℃以上200℃以下の溶媒を加えた後、蒸留により沸点100℃以下の成分を留去することによって、縮合反応物溶液を得る第3の工程と
を含む方法を提供する。
縮合反応物溶液を、開口幅が狭く高アスペクト比なトレンチ内に埋め込むためには、縮合反応物溶液の流動性が低いことが好ましい。本発明では、該流動性の低さを、縮合反応物溶液の固形分濃度50質量%における25℃での粘度で評価する。
本発明の別の態様は、上述した本発明の縮合反応物溶液を基板上に塗布して塗布基板を得る塗布工程と、該塗布工程で得た塗布基板を加熱する焼成工程とを含む、絶縁膜の形成方法を提供する。前述したような方法により製造された縮合反応物溶液は、通常の方法で基板上に塗布することができる。塗布方法としては例えばスピンコート法、ディップコート法、ローラーブレード塗布法、スプレー塗布法等が挙げられる。中でも成膜時の塗布厚みが均一である点でスピンコート法が好ましい。
絶縁膜の表面を疎水化処理剤にさらす方法としては、疎水化処理剤を絶縁膜表面に液相で塗布する方法、疎水化処理剤を気相にして絶縁膜表面に接触させる方法等を適用することができる。
(1) 縮合反応物のNMR測定(Q4成分量測定)
サンプル調製:縮合反応物濃度(実験上は固形分濃度とした)25質量%の重アセトン溶液にクロミニウムアセチルアセトネートを0.9質量%添加し、サンプル調製を行った。
測定条件:日本電子製の核磁気共鳴(NMR)装置:ECA700、プローブSI10を使用し、待ち時間を120秒、積算回数を512回で積算を行った。
ピーク解析:各Q成分のピーク面積を用い、縮合反応物中の全4官能シロキサン成分のピーク強度(A)と、該縮合反応物中のシロキサン結合数4つに相当する成分(すなわちQ4成分)のピーク強度(B)から、以下の式:Q4量={(B)/(A)}×100(%)、に従ってQ4量を算出した。
東ソー製のゲルパーミエーションクロマトグラフィー(GPC)、HLC-8220、TSKgelGMHHR-Mカラムを使用した。アセトン溶媒中、縮合反応物を1質量%溶液にして測定し、示差屈折率計(RI)により標準ポリメチルメタクリレート換算の重量平均分子量(Mw)を求めた。
固形分濃度20質量%の縮合反応物溶液に等量(質量基準)の水を加え攪拌し、この混合溶液をpH試験紙につけてpHを測定した。
固形分濃度20質量%の縮合反応物溶液の水分含有量を、島津製作所社製のガスクロマトグラフ(GC-14B)を使用し、TCD検出器を用いて内部検量線法により求めた。
固形分濃度20質量%の縮合反応物溶液のアルコール含有量を、島津製作所社製のガスクロマトグラフ(GC-14B)を使用し、TCD検出器を用いて内部検量線法により求めた。
既知濃度の縮合反応物溶液を固形分濃度50質量%までエバポレーターで濃縮し、濃縮後の縮合反応物溶液の温度が25℃以下になってから5分以内に粘度測定を行った。固形分濃度50質量%のサンプルを粘度計(東機産業(株)製 E型粘度計(RE-85R型)、コーンローター:1°34′×R24)のサンプルカップに1.1ml入れ、適切な回転数でローターを回転させた。粘度の値が安定したとき(ばらつきが2%以下となったとき)の値を求めた。
縮合反応物溶液を室温で2週間放置した後目視でゲル化の有無を観察した。ゲル化が観察される場合をB、観察されない場合をAとした。
(8) 成膜性
Si基板に縮合反応物膜を成膜した後、100℃で2分間、続いて140℃で5分間、ホットプレート上で段階的にプリベークした。その後、膜の表面を光学顕微鏡にて観察し、ストライエーション又はコメットが観察される場合をB、観察されない場合をAとした。
Si基板に縮合反応物膜を種々の厚みで成膜した後、100℃で2分間、続いて140℃で5分間、ホットプレート上で段階的にプリベークした。その後700℃、N2雰囲気下で焼成し、焼成後の膜の表面を光学顕微鏡にて観察した。光学顕微鏡にて、膜にクラックが入っているか否かを判定した。クラック限界膜厚が0.8μm未満の場合をB、0.8μm以上1.0μm未満の場合をA、1.0μm以上1.5μm未満の場合をAA、1.5μm以上の場合をAAAとした。
Si基板に縮合反応物膜を成膜した後、100℃で2分間、続いて140℃で5分間、ホットプレート上で段階的にプリベークした。このときの膜厚T1、及び、その後、700℃、酸素濃度10ppm以下の雰囲気下で焼成した焼成後の膜厚T2を、J.A.Woollam社製分光エリプソメーターM-2000U-Xeで測定した。焼成前後の膜厚から、以下の式:収縮率=(1-T2/T1)×100(%)、に従って収縮率を求めた。収縮率が15%以上の場合をB、12%以上15%未満の場合をA、8%以上12%未満の場合をAA、8%未満の場合をAAAとした。
上記(10)と同様の手順で700℃、酸素濃度10ppm以下の雰囲気下での焼成までを行った。焼成後の膜を、質量比がHF:水=1:299のHF水溶液に10分間浸し、HF試験前後の膜厚を分光エリプソメーターで測定した。Si基板上の膜が溶解するHFレートが50nm/min以上でかつHF浸漬後の屈折率変化が0.01以上であればB、上記HFレートが50nm/min未満でかつHF浸漬後の屈折率変化が0.01以上であればA、上記HFレートが10nm/min未満でかつHF浸漬後の屈折率変化が0.01未満であればAAとした。
上記(10)と同様の手順で700℃、酸素濃度10ppm以下の雰囲気下での焼成までを行った。焼成後の膜に、カッターで格子パターンの各方向に1mm間隔で6本切り込みを入れて、1mm×1mmの25個の格子パターンを形成し、そこへ透明感圧付着テープを密着させ、テープを剥がした。その後の格子パターンを観察し、25個全て剥がれていない場合をAA、1~4個剥がれている場合をA、5個以上剥がれている場合をBとした。
開口幅20nm、深さ1μm(すなわちアスペクト比50)のトレンチを有するSi基板に縮合反応物を成膜した後、100℃で2分間、続いて140℃で5分間、ホットプレート上で段階的にプリベークした。その後、700℃、酸素濃度10ppm以下の雰囲気下で焼成した。焼成後、トレンチを有するSi基板を割断し、FIB加工をした後、日立製作所製、走査型電子顕微鏡(SEM)S4800を使用し、加速電圧1kVで観察した。1つの割断した基板中、1000箇所のトレンチ部分を観察した。全ての箇所でボイド又はシームが無くトレンチ内が埋まっていればAAA、10個以下のトレンチにボイド又はシームがある場合をAA、10個より多く100個以下のトレンチにボイド又はシームがある場合をA、100個より多いトレンチにボイド又はシームがある場合をBとした。
[製造例1]
ナスフラスコに、メチルトリメトキシシラン(MTMS)11.6g、テトラエトキシシラン(TEOS)4.4g、及びエタノール20gを入れて攪拌し、ここへ水11.5gとpH調整のための適切量の濃硝酸との混合水溶液を室温で滴下してpHを6~7に調整した。滴下終了後、30分間攪拌し、24時間静置した。
表1記載の原料を用いた他は製造例1と同様にして合成を行った。
以下に、製造例1~14で作製したポリシロキサン化合物とシリカ粒子とを反応させて縮合反応物を得る例を示す。
各実施例及び各比較例においては、ポリシロキサン化合物の縮合換算量とシリカ粒子の仕込み量との比率を変化させることにより、様々な組成比の縮合反応物を得た。なお表2中のシリカ粒子量は、ポリシロキサン化合物の縮合換算量とシリカ粒子量との合計質量基準である。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)47.6g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例1で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。生成した縮合反応物溶液の、上記(1)~(7)で示される物性評価を行い、評価結果を表3に示した。29SiNMRスペクトルを図1に示した。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)63.5g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例2で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)63.5g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例3で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-1(扶桑化学工業製の平均一次粒子径15nm、12質量%濃度の水分散シリカ粒子)33.3g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例4で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)23.8g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例5で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-1(扶桑化学工業製の平均一次粒子径15nm、12質量%濃度の水分散シリカ粒子)41.7g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例6で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)15.9g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例7で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)47.6g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例8で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔および滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)47.6g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例9で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)47.6g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例10で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)127g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例11で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
製造例12で合成したポリシロキサン化合物にプロピレングリコールメチルエチルアセテート(PGMEA)を50g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)47.6g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例13で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)127g及びエタノール80gを入れ、5分間攪拌し、ここへ製造例14で合成したポリシロキサン化合物を室温で滴下した。滴下終了後30分間攪拌した後、4時間還流した。還流後、プロピレングリコールメチルエチルアセテート(PGMEA)を150g添加し、オイルバスを昇温させて、蒸留ラインよりメタノール、エタノール、水、及び硝酸を留去し、縮合反応物のPGMEA溶液を得た。該縮合反応物のPGMEA溶液を濃縮し、固形分濃度20質量%のPGMEA溶液を得た。
500mLナスフラスコに、メチルトリメトキシシラン11.6g、テトラエトキシシラン4.4g、及びエタノール20gを入れ、5分間攪拌した後、PL-06L(扶桑化学工業製の平均一次粒子径6nm、6.3質量%濃度の水分散シリカ粒子)47.6gを添加した。1分間攪拌し、ここへ濃硝酸10μlを滴下し、30分間攪拌した。濃縮及びエタノール添加によって濃度を調整し、縮合反応物の固形分濃度20質量%のエタノール溶液を得た。
蒸留塔及び滴下ロートを有する4つ口の500mLフラスコに、メチルトリメトキシシラン11.6g、テトラエトキシシラン4.4g、及びPGMEA20gを入れ、5分間攪拌した後、溶液の温度を50℃に設定し、ここへ水11.5gと濃硝酸10μlとの混合水溶液を滴下した。次いで、50℃で3時間攪拌した後、PGMEAを50gを追加した。その後、オイルバスを昇温させて、蒸留ラインよりエタノール、水、及び硝酸を留去し、ポリシロキサン化合物のPGMEA溶液を得た。次いで、得られたポリシロキサン化合物のPGMEA溶液と、AD-1003(触媒化成工業製の平均一次粒子径7nm、20質量%濃度のイソプロパノール分散シリカ粒子)15gをPGMEAに置換したPGMEA分散シリカ粒子とを混合し、5分間攪拌して、固形分濃度20質量%のPGMEA溶液を得た。
Claims (9)
- (I)(i)下記一般式(1):
R1 nSiX1 4-n (1)
{式中、nは、0~3の整数であり、R1は、水素原子又は炭素数1~10の炭化水素基であり、X1は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表されるシラン化合物に由来するポリシロキサン化合物の縮合換算量40質量%以上99質量%以下と、(ii)シリカ粒子1質量%以上60質量%以下と、を少なくとも含有する縮合成分を縮合反応させて得られる縮合反応物、及び
(II)溶媒
を含み、
該一般式(1)で表されるシラン化合物が、一般式(1)中のnが0である4官能シラン化合物及び一般式(1)中のnが1である3官能シラン化合物を少なくとも含有する2種類以上のシラン化合物である、縮合反応物溶液。 - 該縮合成分が、該ポリシロキサン化合物の縮合換算量50質量%以上90質量%以下と該シリカ粒子10質量%以上50質量%以下とを含有し、
該ポリシロキサン化合物中の、下記一般式(2):
SiX2 4 (2)
{式中、X2は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される4官能シラン化合物に由来する成分の割合が5mol%以上40mol%以下である、請求項1に記載の縮合反応物溶液。 - 該ポリシロキサン化合物中の、下記一般式(3):
R2SiX3 3 (3)
{式中、R2は、炭素数1~10の炭化水素基であり、X3は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される3官能シラン化合物に由来する成分の割合が60mol%以上95mol%以下である、請求項1又は2に記載の縮合反応物溶液。 - 29SiNMR分析における、該縮合反応物中の全4官能シロキサン成分のピーク強度(A)と、該縮合反応物中のシロキサン結合数4つに相当する成分のピーク強度(B)とが
{(B)/(A)}≧0.50
の関係を満たす、請求項1又は2に記載の縮合反応物溶液。 - 該縮合反応物の重量平均分子量が、1,000以上20,000以下である、請求項1又は2に記載の縮合反応物溶液。
- 半導体素子に形成されたトレンチの埋め込み用途に使用される、請求項1又は2に記載の縮合反応物溶液。
- 請求項1又は2に記載の縮合反応物溶液を製造する方法であって:
下記一般式(2):
SiX2 4 (2)
{式中、X2は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される4官能シラン化合物5mol%以上40mol%以下と、下記一般式(3):
R2SiX3 3 (3)
{式中、R2は、炭素数1~10の炭化水素基であり、X3は、ハロゲン原子、炭素数1~6のアルコキシ基又はアセトキシ基である。}
で表される3官能シラン化合物60mol%以上95mol%以下とからなるシラン化合物を、アルコール水溶液中、pH5以上7未満の弱酸性条件で加水分解重縮合して、ポリシロキサン化合物を得る第1の工程と、
該第1の工程で得たポリシロキサン化合物の縮合換算量40質量%以上99質量%以下と、シリカ粒子1質量%以上60質量%以下と、からなる縮合成分を、炭素数1~4のアルコール水溶液中、pH6~8の条件下、50℃以上の温度で縮合反応させて、反応液を得る第2の工程と、
該第2の工程で得た反応液に、アルコール、ケトン、エステル、エーテル及び炭化水素系溶媒からなる群から選ばれる少なくとも1種類の沸点100℃以上200℃以下の溶媒を加えた後、蒸留により沸点100℃以下の成分を留去することによって、縮合反応物溶液を得る第3の工程と
を含む、方法。 - 請求項1又は2に記載の縮合反応物溶液を基板上に塗布して塗布基板を得る塗布工程と、
該塗布工程で得た塗布基板を加熱する焼成工程と
を含む、絶縁膜の形成方法。 - 該基板がトレンチ構造を有する、請求項8に記載の絶縁膜の形成方法。
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Also Published As
Publication number | Publication date |
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TWI527845B (zh) | 2016-04-01 |
CN102459423A (zh) | 2012-05-16 |
TW201434881A (zh) | 2014-09-16 |
US8906153B2 (en) | 2014-12-09 |
KR20120022878A (ko) | 2012-03-12 |
CN102459423B (zh) | 2015-05-20 |
US20120100298A1 (en) | 2012-04-26 |
TW201120103A (en) | 2011-06-16 |
CN103642386A (zh) | 2014-03-19 |
EP2447303A1 (en) | 2012-05-02 |
EP2447303A4 (en) | 2012-10-10 |
KR101294452B1 (ko) | 2013-08-07 |
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