WO2012147680A1 - 成膜方法 - Google Patents
成膜方法 Download PDFInfo
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- WO2012147680A1 WO2012147680A1 PCT/JP2012/060834 JP2012060834W WO2012147680A1 WO 2012147680 A1 WO2012147680 A1 WO 2012147680A1 JP 2012060834 W JP2012060834 W JP 2012060834W WO 2012147680 A1 WO2012147680 A1 WO 2012147680A1
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- source gas
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000001179 sorption measurement Methods 0.000 claims abstract description 73
- 239000000126 substance Substances 0.000 claims abstract description 62
- 239000000758 substrate Substances 0.000 claims abstract description 62
- 239000007789 gas Substances 0.000 claims description 244
- 150000004767 nitrides Chemical class 0.000 claims description 21
- 239000002994 raw material Substances 0.000 claims description 20
- 238000009832 plasma treatment Methods 0.000 claims description 17
- 238000011282 treatment Methods 0.000 claims description 11
- 239000001257 hydrogen Substances 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 5
- 229910000077 silane Inorganic materials 0.000 claims description 5
- LXEXBJXDGVGRAR-UHFFFAOYSA-N trichloro(trichlorosilyl)silane Chemical compound Cl[Si](Cl)(Cl)[Si](Cl)(Cl)Cl LXEXBJXDGVGRAR-UHFFFAOYSA-N 0.000 claims description 5
- 150000004820 halides Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 16
- 239000010408 film Substances 0.000 description 120
- 239000010410 layer Substances 0.000 description 75
- 239000000460 chlorine Substances 0.000 description 28
- 238000005121 nitriding Methods 0.000 description 20
- 238000009792 diffusion process Methods 0.000 description 14
- 238000000231 atomic layer deposition Methods 0.000 description 13
- 239000012535 impurity Substances 0.000 description 13
- 239000004065 semiconductor Substances 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 10
- 239000002585 base Substances 0.000 description 8
- 230000005284 excitation Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 229910052801 chlorine Inorganic materials 0.000 description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 229910052814 silicon oxide Inorganic materials 0.000 description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 4
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- -1 hafnium nitride Chemical class 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 2
- LZESIEOFIUDUIN-UHFFFAOYSA-N 2-[amino(tert-butyl)silyl]-2-methylpropane Chemical compound CC(C)(C)[SiH](N)C(C)(C)C LZESIEOFIUDUIN-UHFFFAOYSA-N 0.000 description 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- 229910004469 SiHx Inorganic materials 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 229910001195 gallium oxide Inorganic materials 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 229910000449 hafnium oxide Inorganic materials 0.000 description 1
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Images
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
- C23C16/345—Silicon nitride
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
- C23C16/45536—Use of plasma, radiation or electromagnetic fields
- C23C16/4554—Plasma being used non-continuously in between ALD reactions
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
- C23C16/511—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using microwave discharges
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02164—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 being a silicon oxide, e.g. SiO2
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—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
- H01L21/0217—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 being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02205—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition
- H01L21/02208—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02211—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 being a silane, e.g. disilane, methylsilane or chlorosilane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
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- H—ELECTRICITY
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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
- H01L21/02225—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
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/0228—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition deposition by cyclic CVD, e.g. ALD, ALE, pulsed CVD
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/318—Inorganic layers composed of nitrides
Definitions
- the present invention relates to a film forming method, and more particularly to a film forming method used for manufacturing a semiconductor element.
- ALD atomic layer deposition
- Patent Document 1 Japanese Patent Application Laid-Open No. 2007-138295
- the ALD process will be briefly described as follows. First, a gas for chemical adsorption is supplied into the processing container, and the atomic layer is chemically adsorbed on the surface of the substrate to be processed. Then, the processing container is exhausted. Specifically, excess gas that has not been chemically adsorbed or gas that has been physically adsorbed on the chemical adsorption layer is removed. Thereafter, the chemically adsorbed layer is subjected to nitriding treatment, oxidation treatment, or the like for modification. Such a series of steps is repeated until a desired film thickness is reached.
- An object of the present invention is to provide a film forming method capable of improving throughput and forming a high quality film.
- the film forming method according to the present invention is a film forming method for forming a film on a substrate to be processed, wherein a first source gas is supplied onto the substrate to be processed, and the first source gas is supplied onto the substrate to be processed.
- a first source gas supply step for adsorbing to form a first chemical adsorption layer, and a second different from the first source gas on the substrate to be processed on which the first chemical adsorption layer is formed A second raw material gas supply step of forming a second chemical adsorption layer by being adsorbed by the second raw material gas on the first chemical adsorption layer, and using microwave plasma,
- a plasma processing step of performing plasma processing on the first and second chemical adsorption layers is a film forming method for forming a film on a substrate to be processed, wherein a first source gas is supplied onto the substrate to be processed, and the first source gas is supplied onto the substrate to be processed.
- the plasma is applied to at least the first and second chemical adsorption layers formed by supplying the first and second source gases and adsorbing the first and second source gases. Since the treatment is performed, the number of plasma treatments can be reduced and the throughput can be improved when forming a film with a desired thickness. In addition, since the plasma treatment is performed on at least the first and second chemical adsorption layers to form a film having a desired film thickness, the possibility of causing plasma damage to the underlayer of the chemical adsorption layer is reduced. . Therefore, a high quality film can be formed.
- the method includes a first source gas exhaust step of exhausting the first source gas after the first source gas supply step and before the second source gas supply step.
- it includes a second source gas exhausting step for exhausting the second source gas after the second source gas supplying step.
- the first source gas supply step includes a step of supplying a gas containing a halide.
- the second source gas supply step includes a step of supplying a gas having a hydrogen bond.
- the first source gas supply step is a step of supplying a gas containing Si 2 Cl 6 (hexachlorodisilane), and the second source gas supply step contains SiH 4 (silane). Supplying a gas.
- the microwave plasma is generated by a radial line slot antenna (RLSA).
- RLSA radial line slot antenna
- the plasma processing step uses microwave plasma in the vicinity of the surface of the substrate to be processed, in which the plasma electron temperature is lower than 1.5 eV and the plasma electron density is higher than 1 ⁇ 10 11 cm ⁇ 3 . It was processing that was.
- the film forming method is a method of forming a nitride film or an oxide film.
- the plasma is applied to at least the first and second chemical adsorption layers formed by supplying the first and second source gases and adsorbing the first and second source gases. Since the treatment is performed, the number of plasma treatments can be reduced and the throughput can be improved when forming a film with a desired thickness. In addition, since the plasma treatment is performed on at least the first and second chemical adsorption layers to form a film having a desired film thickness, the possibility of causing plasma damage to the underlayer of the chemical adsorption layer is reduced. . Therefore, a high quality film can be formed as a whole.
- FIG. 1 is a schematic cross-sectional view showing a part of a MOS type semiconductor device having a film formed by a film forming method according to an embodiment of the present invention.
- the conductive layer is indicated by hatching.
- MOS type semiconductor element 11 includes element isolation region 13, p-type well 14a, n-type well 14b, high-concentration n-type impurity diffusion region 15a, high-concentration p-type impurity on silicon substrate 12. Diffusion region 15b, n-type impurity diffusion region 16a, p-type impurity diffusion region 16b, and gate oxide film 17 are formed.
- One of the high-concentration n-type impurity diffusion region 15a and the high-concentration p-type impurity diffusion region 15b formed so as to sandwich the gate oxide film 17 is a drain, and the other is a source.
- a gate electrode 18 serving as a conductive layer is formed on the gate oxide film 17, and a gate sidewall 19 serving as an insulating film is formed on a side portion of the gate electrode 18. Furthermore, an insulating film 21 is formed on the silicon substrate 12 on which the gate electrode 18 and the like are formed. In the insulating film 21, a contact hole 22 that is continuous with the high concentration n-type impurity diffusion region 15 a and the high concentration p-type impurity diffusion region 15 b is formed, and a buried electrode 23 is formed in the contact hole 22. Further, a metal wiring layer 24 serving as a conductive layer is formed thereon.
- an interlayer insulating film (not shown) to be an insulating layer and a metal wiring layer to be a conductive layer are alternately formed, and finally a pad (not shown) to be a contact point with the outside is formed.
- the MOS type semiconductor element 11 is formed.
- a semiconductor element having a film formed by the film forming method according to one embodiment of the present invention is adsorbed on the substrate to be processed by the first and second source gases to form a chemical adsorption layer.
- a silicon oxide film formed by performing plasma treatment on the multilayer chemical adsorption layer formed and adsorbed by the first and second source gases is included as the gate oxide film 17, for example.
- the insulating film formed by the film forming method according to an embodiment of the present invention is a silicon oxide film that constitutes the gate oxide film described above, and the first and second source gases are formed on the substrate to be processed.
- a chemical adsorption layer is formed by adsorbing with the first and second raw material gases, and a multilayer chemical adsorption layer formed by adsorption with the first and second source gases is subjected to plasma treatment.
- FIG. 2 is a schematic cross-sectional view showing the main part of the plasma processing apparatus used in the film forming method according to one embodiment of the present invention.
- 3 is a view of the slot antenna plate included in the plasma processing apparatus shown in FIG. 2 as viewed from the lower side, that is, from the direction of arrow III in FIG. In FIG. 2, some of the members are not hatched for easy understanding.
- a plasma processing apparatus 31 includes a processing container 32 that performs plasma processing on a substrate W to be processed therein, a gas for plasma excitation in the processing container 32, and a material used for plasma processing.
- Gas a gas supply unit 33 for supplying a raw material gas in ALD, a disk-like support base 34 for supporting the substrate W to be processed, and plasma for generating plasma in the processing chamber 32 using microwaves
- a generation mechanism 39 and a control unit (not shown) that controls the operation of the entire plasma processing apparatus 31 are provided.
- the control unit controls the entire plasma processing apparatus 31 such as a gas flow rate in the gas supply unit 33 and a pressure in the processing container 32.
- the processing container 32 includes a bottom portion 41 located on the lower side of the support base 34 and a side wall 42 extending upward from the outer periphery of the bottom portion 41.
- the side wall 42 is substantially cylindrical.
- An exhaust hole 43 for exhaust is provided in the bottom 41 of the processing container 32 so as to penetrate a part thereof.
- the upper side of the processing container 32 is open, and a lid 44 disposed on the upper side of the processing container 32, a dielectric window 36 described later, and a seal member interposed between the dielectric window 36 and the lid 44.
- the processing container 32 is configured to be hermetically sealed by an O-ring 45 as a sealing member.
- the gas supply unit 33 includes a first gas supply unit 46 that blows gas toward the center of the substrate to be processed W, and a second gas supply unit 47 that blows gas from the peripheral side of the substrate to be processed W. .
- the gas supply hole 30 for supplying gas in the first gas supply section 46 is more dielectric than the lower surface 48 of the dielectric window 36 which is the center in the radial direction of the dielectric window 36 and faces the support base 34. It is provided at a position retracted inward of the body window 36.
- the first gas supply unit 46 adjusts the flow rate and the like by a gas supply system 49 connected to the first gas supply unit 46, and the inert gas for plasma excitation, the material gas for plasma processing, and the raw material for ALD Supply gas.
- the second gas supply unit 47 is formed by providing a plurality of gas supply holes 50 for supplying plasma excitation gas, material gas, source gas, and the like in the processing vessel 32 in a part of the upper side of the side wall 42. Has been.
- the plurality of gas supply holes 50 are provided at equal intervals in the circumferential direction.
- the first gas supply unit 46 and the second gas supply unit 47 are supplied with the same kind of inert gas for plasma excitation, source gas, and the like from the same gas supply source.
- another gas can also be supplied from the 1st gas supply part 46 and the 2nd gas supply part 47, and those flow ratios etc. can also be adjusted.
- a high frequency power supply 58 for RF (radio frequency) bias is electrically connected to the electrode 61 in the support table 34 via the matching unit 59.
- the high frequency power supply 58 can output a high frequency of 13.56 MHz, for example, with a predetermined power (bias power).
- the matching unit 59 accommodates a matching unit for matching between the impedance on the high-frequency power source 58 side and the impedance on the load side such as the electrode 61, plasma, and the processing vessel 32. Includes a blocking capacitor for protecting the matching unit.
- the support base 34 can support the substrate W to be processed thereon by an electrostatic chuck (not shown).
- the support table 34 includes a temperature adjustment mechanism for heating and the like, and can be set to a desired temperature by a heater 29 provided inside the support table 34, for example.
- the support base 34 is supported by an insulating cylindrical support 51 that extends vertically upward from the lower side of the bottom 41.
- the exhaust hole 43 described above is provided so as to penetrate a part of the bottom 41 of the processing container 32 along the outer periphery of the cylindrical support part 51.
- An exhaust chamber (not shown) protruding downward is provided so as to surround the exhaust hole 43, and an exhaust device (not shown) is connected via an exhaust pipe (not shown) connected to the exhaust chamber.
- the exhaust device has a vacuum pump such as a turbo molecular pump.
- the inside of the processing container 32 can be depressurized to a predetermined pressure by the exhaust device.
- the plasma generation mechanism 39 is provided on the top and outside of the processing vessel 32.
- the plasma generation mechanism 39 is disposed at a position facing the microwave generator 35 for generating plasma excitation microwaves and the support base 34, and the microwave generated by the microwave generator 35 is placed in the processing container 32.
- a dielectric window 36 to be introduced and a plurality of slots 40 are provided.
- the slot antenna plate is disposed above the dielectric window 36 and radiates microwaves to the dielectric window 36.
- 37 and a dielectric member 38 that is disposed above the slot antenna plate 37 and that propagates a microwave introduced by a coaxial waveguide 56 to be described later in the radial direction.
- a microwave generator 35 having a matching mechanism 53 is connected to an upper portion of a coaxial waveguide 56 for introducing a microwave through a waveguide 55 and a mode converter 54.
- a TE mode microwave generated by the microwave generator 35 passes through the waveguide 55, is converted to a TEM mode by the mode converter 54, and propagates through the coaxial waveguide 56.
- 2.45 GHz is selected as the frequency of the microwave generated by the microwave generator 35.
- the dielectric window 36 has a substantially disc shape and is made of a dielectric. A part of the lower surface 48 of the dielectric window 36 is provided with an annular recess 57 that is recessed in a tapered shape for facilitating generation of a standing wave by the introduced microwave. Due to the concave portion 57, microwave plasma can be efficiently generated on the lower side of the dielectric window 36.
- Specific materials for the dielectric window 36 include quartz and alumina.
- the slot antenna plate 37 has a thin plate shape made of metal and has a disc shape. As shown in FIG. 2, the plurality of slot-like slots 40 are provided such that a pair of slots 40 are provided so as to be substantially perpendicular to the letter C, and the pair of slots 40 are predetermined in the circumferential direction. They are concentrically arranged at intervals. Also in the radial direction, a plurality of pairs of slots 40 are provided concentrically at predetermined intervals.
- the microwave generated by the microwave generator 35 is propagated to the dielectric member 38 through the coaxial waveguide 56.
- the microwave has a circulation path 60 for circulating a refrigerant or the like inside, and is sandwiched between the cooling antenna 52 and the slot antenna plate 37 for adjusting the temperature of the slot antenna plate 37, the dielectric window 36, the dielectric member 38, and the like.
- the inside of the dielectric member 38 spreads radially outward in the radial direction, passes through the dielectric window 36 from the plurality of slots 40 provided in the slot antenna plate 37, and is introduced into the processing container 32.
- the microwaves generate an electric field directly below the dielectric window 36 and generate plasma in the processing chamber 32.
- the microwave plasma to be processed in the plasma processing apparatus 31 is radiated from a radial line slot antenna (RLSA) including the cooling jacket 52, the slot antenna plate 37, and the dielectric member 38 having the above-described configuration. Is generated in the processing container 32 by the microwave.
- RLSA plasma the plasma generated in this way may be referred to as RLSA plasma.
- FIG. 4 is a graph showing the relationship between the distance from the lower surface 48 of the dielectric window 36 in the processing chamber 32 and the plasma electron temperature when plasma is generated in the plasma processing apparatus 31.
- FIG. 5 is a graph showing the relationship between the distance from the lower surface 48 of the dielectric window 36 in the processing container 32 and the electron density of the plasma when plasma is generated in the plasma processing apparatus 31.
- the region immediately below dielectric window 36, specifically, region 26 up to about 10 mm indicated by a one-dot chain line in FIG. 4 is called a so-called plasma generation region.
- the electron temperature is high and the electron density is higher than 1 ⁇ 10 12 cm ⁇ 3 .
- a region 27 exceeding 10 mm indicated by a two-dot chain line is called a plasma diffusion region.
- the electron temperature is about 1.0 to 1.3 eV, at least lower than 1.5 eV, and the electron density is about 1 ⁇ 10 12 cm ⁇ 3 , and at least higher than 1 ⁇ 10 11 cm ⁇ 3 .
- Plasma processing for the substrate W to be processed is performed in such a plasma diffusion region, for example. That is, in the plasma treatment, microwave plasma having a plasma electron temperature lower than 1.5 eV and a plasma electron density higher than 1 ⁇ 10 11 cm ⁇ 3 is used in the vicinity of the surface of the substrate W to be processed. desirable.
- FIG. 6 is a flowchart showing typical steps in the film forming method according to one embodiment of the present invention.
- the temperature of the support table 34 at the time of plasma processing described later for example, an arbitrary temperature between 300 to 400 ° C. is selected.
- a silicon nitride film (SiN film) is formed for film formation.
- a natural oxide film, an organic substance, or the like adheres to the surface of the substrate to be processed W for example, Si 2 Cl 6 (hexachlorodisilane (hereinafter also referred to as “HCD”) may be formed on the substrate W to be processed.
- the source gas chemical adsorption layer may not be formed even if the source gas containing the gas is supplied, in which case hydrogen plasma is generated in the processing chamber 32 and the surface of the substrate W to be processed is hydrogenated. Such a problem may deteriorate the uniformity and quality of the film to be formed, so that the surface condition of the substrate W to be processed can be obtained by performing the pretreatment process as described above.
- the pretreatment process can be appropriately changed according to the type of the substrate to be processed W, the type of film to be formed, and the required film quality, for example, when the substrate to be processed W is a Si substrate, Chemisorption Without being performed, the substrate to be processed W may be directly subjected to nitridation using plasma, or organic substances may be removed by irradiating the substrate to be processed W with ultraviolet rays. These are optional steps performed as necessary, and can be omitted.
- a first source gas containing a chlorine-based gas for example, Si 2 Cl 6 (HCD) is supplied from the gas supply units 46 and 47 to the surface of the substrate W to be processed, and is adsorbed by the first source gas.
- a first chemical adsorption layer is formed (FIG. 6A).
- the surface of the substrate to be processed W is terminated with hydrogen, so that H (hydrogen) on the surface of the substrate to be processed W and Cl (chlorine) of Si 2 Cl 6 (HCD) are formed. It reacts and becomes HCl.
- the first chemical adsorption layer is formed by the chemical adsorption of SiCl 3 on the surface of the substrate W to be processed. In this case, the surface of the substrate to be processed W is terminated with chlorine.
- the first raw material gas remaining unnecessarily in the processing container 32 is exhausted (FIG. 6B).
- the gas in the processing container 32 can be removed from the exhaust hole 43 while supplying the purge gas for exhaust from the gas supply units 46 and 47.
- argon (Ar) gas is used as the purge gas.
- a second source gas different from the first source gas for example, a SiH 4 (silane) gas having a hydrogen bond
- a SiH 4 (silane) gas having a hydrogen bond is supplied from the gas supply units 46 and 47.
- a second chemical adsorption layer adsorbed by the second raw material gas is formed (FIG. 6C).
- Cl (chlorine) on the surface of the substrate W to be processed reacts with H of SiH 4 as the second source gas to be desorbed as HCl.
- the second chemical adsorption layer is formed by chemical adsorption of Si compounds (SiHx such as SiH, SiH 2 and SiH 3 ) on the surface of the substrate W to be processed.
- SiHx such as SiH, SiH 2 and SiH 3
- the second source gas is exhausted in the processing container 32 (FIG. 6D).
- the exhaust gas is supplied from the gas supply units 46 and 47 while the purge gas for exhaust is being supplied from the exhaust hole 43 in the same manner as the exhaust of the first source gas described above.
- the gas in 32 can be removed.
- the formation of the first chemical adsorption layer by supplying the first raw material gas and the formation of the second chemical adsorption layer by supplying the second raw material gas are performed.
- the steps shown in FIGS. 6A to 6D that is, the formation of the chemical adsorption layers of the first and second source gases are alternately performed a plurality of times, and a desired plasma treatment is performed.
- a film thickness can be formed. For example, a film thickness of 0.2 to 20 nm is good.
- the first and second chemisorption layers are alternately formed a plurality of times to form a desired film thickness, and the first and second chemisorption layers are subjected to plasma treatment with a nitrogen-containing gas plasma.
- plasma nitriding is performed using the microwave plasma generated by the plasma processing apparatus 31 described above.
- a gas for plasma processing or the like for example, an argon (Ar) gas as a plasma excitation gas and an ammonia (NH 3 ) gas as a nitrogen-containing gas from a gas supply unit 46 or 47 to supply a nitrogen-containing gas
- the plasma nitriding treatment of the first and second chemical adsorption layers is performed with the plasma of the nitrogen-containing gas.
- plasma oxidation is performed using a mixed gas of argon (Ar) gas and oxygen (O 2 ) gas as a plasma excitation gas.
- FIGS. 6A to 6F After this plasma treatment, the plasma treatment gas is exhausted (FIG. 6F). Then, the steps of FIGS. 6A to 6F are repeated again to obtain a nitride film having a desired film thickness.
- the first and second source gases are supplied, and the formed first and second chemical adsorption layers are subjected to plasma treatment.
- the number of plasma treatments can be reduced, and the throughput can be improved.
- the risk of plasma damage to the underlayer of the chemical adsorption layer is reduced. Therefore, a high quality film can be formed.
- ALD can be performed at a relatively low temperature, and it is not necessary to perform a treatment such as 600 ° C. or higher unlike thermal ALD, so that a high-quality film can be formed at a low temperature.
- the manufacturing process can be liberalized.
- a gas containing BTBAS bis-tert-butyl-amino-silane
- the ALD gas a gas containing BTBAS (bis-tert-butyl-amino-silane)
- BTBAS bis-tert-butyl-amino-silane
- a gas containing a relatively large molecular weight such as BTBAS is generally expensive and at least more expensive than a gas containing at least the relatively low molecular weight hexachlorodisilane or silane. Therefore, it is disadvantageous to use a large amount of such an expensive gas in the above-described film formation in view of cost.
- the raw material gas supplied in the processing vessel is not chemically adsorbed but is relatively excessive and finally exhausted. From such a viewpoint, it is advantageous from the viewpoint of cost reduction to use the gas containing hexachlorodisilane or the gas containing silane.
- the microwave plasma is generated by a radial line slot antenna (RLSA). Then, plasma damage during film formation can be greatly reduced. Therefore, according to such a film forming method, a high quality film can be formed. That is, since the plasma generated by the microwave emitted from the RLSA is used, the generated plasma is processed at a relatively low electron temperature. Moreover, since radicals are mainly generated, nitriding is performed using radicals. Then, when forming the nitride film, it is possible to greatly reduce physical damage due to charging damage or ion irradiation to the underlayer. Therefore, a high quality film can be formed.
- RLSA radial line slot antenna
- the first source gas in addition to the above-described Si 2 Cl 6 , SiCl 4 , Si 3 Cl 8 , SiH 2 Cl 2 or the like can be used as a chlorine-based gas. Further, a gas containing aluminum chloride or a gas containing Ge 2 Cl 6 is used. Specifically, the second source gas includes Si 2 H 4 , Si 3 H 8 , SiH 2 Cl 2 , and trimethylaluminum (TMAl) in addition to SiH 4 described above. A gas or a gas containing GeH 4 is used. Further, as the second source gas, a gas having an amino group or a gas having an alkyl group such as a methyl group or an ethyl group is used.
- a pattern using a gas containing aluminum chloride as the first source gas, a gas using a gas containing trimethylaluminum as the second source gas, and Ge 2 Cl 6 as the first source gas There is a pattern using a gas and using a gas containing GeH 4 as the second source gas.
- the formed film includes a nitride film and an oxide film.
- silicon oxide film there are a silicon oxide film, a silicon nitride film, an aluminum oxide film, an aluminum nitride film, a gallium oxide film, a gallium nitride film, a hafnium oxide film, a hafnium nitride film, a ruthenium oxide film, a ruthenium nitride film, and the like.
- FIG. 7 is a graph showing the relationship between the nitride film thickness and the nitriding time.
- the vertical axis represents the nitride film thickness ( ⁇ (angstrom))
- the horizontal axis represents the nitriding time (minutes).
- the nitride film thickness that is, the film thickness that can be nitrided by plasma treatment is between 12 and 14 angstroms. That is, in nitriding in plasma processing, there are few factors due to time, and nitriding can be performed in a short plasma nitriding time by setting the chemical adsorption layer within the above-described film thickness range. Therefore, in the above process, in the initial stage of the film forming process, in consideration of the influence on the target substrate W, a plasma nitriding process may be performed after a chemical adsorption layer of about 12 to 14 angstroms is formed.
- FIG. 8 is a graph showing the relationship between the oxide film thickness and the oxidation time.
- the vertical axis represents the oxide film thickness ( ⁇ (angstrom))
- the horizontal axis represents the oxidation time (seconds).
- the oxide film thickness increases as the oxidation time increases. That is, in the plasma oxidation, the chemical adsorption layer can be formed to an arbitrary thickness, and then the plasma oxidation treatment can be performed for a time corresponding to the thickness, whereby the film can be appropriately formed. Compared with plasma nitridation, the time efficiency of plasma oxidation is about 1/10.
- the process conditions in the film formation include a temperature range of room temperature to less than 600 ° C., preferably 200 to 400 ° C., as the adsorption step.
- the pressure range in the film formation is mainly in the range of 0.1 to 10 Torr. Further, in the case of forming a nitride film, it is 3 to 8 Torr, and in the case of forming an oxide film, it is 50 to 500 mTorr. The range is mainly adopted.
- Table 1 shows a part of specific steps in forming the nitride film.
- the initial nitriding step (step 1) plasma nitriding is performed on the substrate surface.
- NH 3 gas is supplied at a flow rate of 400 sccm
- N 2 gas is supplied at a flow rate of 900 sccm
- Ar gas is supplied at a flow rate of 1200 sccm
- the pressure is set at 5 Torr
- the microwave power is set at 4000 W.
- the surface state of the substrate to be processed is H-terminated.
- this initial nitriding step (step 1) may be omitted if the substrate surface is in a state where an adsorption layer can be formed by supplying the source gas.
- a Cl-based gas (first source gas) is supplied to form a first chemical adsorption layer on the surface of the substrate to be processed.
- Ar gas is supplied at 1000 sccm
- HCD gas as a Cl-based gas is supplied at a flow rate of 100 sccm
- the pressure is set at 1 Torr.
- unnecessary residual material gas is exhausted (step 3).
- the surface state of the substrate to be processed is Cl-terminated.
- step 4 second chemical adsorption layer forming step
- an H-based gas (second raw material gas) is supplied to the second chemical adsorption layer on the second chemical adsorption layer.
- a chemisorbed layer is formed.
- Ar gas is supplied at a flow rate of 1000 sccm
- SiH 4 gas as an H-based gas is supplied at a flow rate of 100 sccm
- the pressure is set at 1 Torr.
- unnecessary remaining source gas is exhausted (step 5).
- Steps 4 and 5 the surface state of the substrate to be processed is H-terminated.
- the Cl-based gas is supplied again to form the first chemical adsorption layer.
- Ar gas is supplied at a flow rate of 1000 sccm
- HCD gas as a Cl-based gas is supplied at 100 sccm
- the pressure is set at 1 Torr.
- unnecessary residual material gas is exhausted (step 7).
- the surface state of the substrate to be processed is again Cl-terminated.
- the H-based gas adsorption step (step 8), the H-based gas is supplied again to form a second chemical adsorption layer.
- Ar gas is supplied at 1000 sccm
- SiH 4 gas as H-based gas is supplied at a flow rate of 100 sccm
- the pressure is set at 1 Torr.
- unnecessary remaining source gas is exhausted (step 9).
- Steps 8 and 9 the surface state of the substrate to be processed is again H-terminated.
- Step 10 the Cl-based gas is supplied again to form the first chemical adsorption layer.
- Ar gas is supplied at 1000 sccm
- HCD gas as Cl-based gas is supplied at a flow rate of 100 sccm
- the pressure is set at 1 Torr.
- unnecessary residual material gas is exhausted (step 11).
- Steps 10 and 11 the surface state of the substrate to be processed is again Cl-terminated.
- the H-based gas is supplied again to form a second chemical adsorption layer.
- Ar gas is supplied at 1000 sccm
- SiH 4 gas as H-based gas is supplied at a flow rate of 100 sccm
- the pressure is set at 1 Torr.
- unnecessary residual material gas is exhausted (step 13).
- Steps 12 and 13 the surface state of the substrate to be processed is again H-terminated.
- adsorption by the Cl-based gas and the adsorption by the H-based gas are alternately performed three times while providing an exhaust process between the steps in the gas adsorption step.
- a first chemisorption layer by supplying a Cl-based gas and a second chemisorption layer by supplying an H-based gas are formed alternately in three layers, and the first six atomic layers are chemisorbed. The layer will be adsorbed.
- nitriding treatment is performed with plasma of atoms adsorbed by six atomic layers (step 14).
- NH 3 gas is flowed at 400 sccm
- N 2 gas is flowed at 900 sccm
- Ar gas is flowed at 1200 sccm
- the pressure is set at 5 Torr
- the microwave power is set at 4000 W.
- plasma nitriding treatment formation of the first nitride film of the atomic layer adsorbed by 6 atomic layers is performed.
- the surface state of the substrate to be processed is H-terminated.
- the flow from step 2 to step 14 is one cycle.
- Steps 15 to 26 are repeated in the same manner as Steps 2 to 13 described above to adsorb the second 6 atomic layer chemical adsorption layer on the first nitride film, and to the second 6 atomic layer portion.
- Plasma nitridation of the chemical adsorption layer is performed (step 27). That is, step 15 to step 27 are the next cycle. In this way, the second nitride film is formed.
- a second nitride film is formed on the first nitride film, and a cycle necessary for gas adsorption and plasma nitridation is repeated so as to obtain a desired film thickness. Then, a nitride film having a desired film thickness formed on the substrate to be processed is obtained.
- the first source gas exhausting step is included between the first source gas supplying step and the second source gas supplying step.
- the first source gas may be exhausted only by supplying the source gas.
- the second raw material gas exhausting step is included after the second raw material gas supplying step.
- the present invention is not limited thereto, and the second raw material gas supplying step and the plasma processing gas supplying step include the second raw material gas exhausting step. You may comprise so that only exhaust of source gas may be performed.
- a cover member that covers the support base is disposed, and the source gas is supplied in the space covered by the cover member. Good. By doing so, the amount of source gas can be reduced and the time can be shortened, and the film can be formed more efficiently.
- the first and second source gases are alternately supplied, and the first chemical adsorption layer by the supply of the first source gas and the second chemical by the supply of the second source gas are supplied.
- the adsorption layers are alternately formed, the present invention is not limited to this.
- a third source gas different from the first and second source gases is supplied between them, and a third chemistry by supplying the third source gas is performed.
- An adsorption layer may be formed.
- other different types of source gases may be used. That is, in the present invention, at least two different source gases are supplied, a chemical adsorption layer is formed, and this is subjected to plasma treatment to form a film.
- the plasma processing is performed by the microwave by RLSA using the slot antenna plate.
- the present invention is not limited to this, and the microwave plasma processing apparatus having the comb-shaped antenna unit, the magnetron type A plasma processing apparatus may be used.
- MOS type semiconductor element 12 silicon substrate, 13 element isolation region, 14a p type well, 14b n type well, 15a high concentration n type impurity diffusion region, 15b high concentration p type impurity diffusion region, 16a n type impurity diffusion region, 16b p-type impurity diffusion region, 17 gate oxide film, 18 gate electrode, 19 gate sidewall, 21 insulating film, 22 contact hole, 23 buried electrode, 24 metal wiring layer, 26, 27 region, 29 heater, 30, 50 gas Supply hole, 31 plasma processing apparatus, 32 processing container, 33 gas supply unit, 34 support base, 35 microwave generator, 36 dielectric window, 37 slot antenna plate, 38 dielectric member, 39 plasma generation mechanism, 40 slot hole , 41 bottom, 42 side walls, 43 exhaust holes, 44 lids , 45 O-ring, 46, 47 gas supply part, 48 lower surface, 49 gas supply system, 51 cylindrical support part, 52 cooling jacket, 53 matching mechanism, 54 mode converter, 55 waveguide, 56 coaxial waveguide, 57 recess, 58 high frequency power supply, 59 matching unit,
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Abstract
Description
Claims (9)
- 被処理基板に成膜を行う成膜方法であって、
前記被処理基板上に、第一の原料ガスを供給し、前記被処理基板上に第一の原料ガスにより吸着して第一の化学吸着層を形成する第一の原料ガス供給工程と、
前記第一の化学吸着層が形成された前記被処理基板上に、前記第一の原料ガスとは異なる第二の原料ガスを供給し、前記第一の化学吸着層上に第二の原料ガスにより吸着して第二の化学吸着層を形成する第二の原料ガス供給工程と、
マイクロ波プラズマを用い、少なくとも前記第一および第二の化学吸着層に対して、プラズマ処理を行うプラズマ処理工程とを含む、成膜方法。 - 前記第一の原料ガス供給工程の後であって前記第二の原料ガス供給工程の前に、前記第一の原料ガスの排気を行う第一の原料ガス排気工程を含む、請求項1に記載の成膜方法。
- 前記第二の原料ガス供給工程の後に、前記第二の原料ガスの排気を行う第二の原料ガス排気工程を含む、請求項1に記載の成膜方法。
- 前記第一の原料ガス供給工程は、ハロゲン化物を含むガスを供給する工程を含む、請求項1に記載の成膜方法。
- 前記第二の原料ガス供給工程は、水素結合を有するガスを供給する工程を含む、請求項1に記載の成膜方法。
- 前記第一の原料ガス供給工程は、Si2Cl6(ヘキサクロロジシラン)を含むガスを供給する工程であり、
前記第二の原料ガス供給工程は、SiH4(シラン)を含むガスを供給する工程を含む、請求項5に記載の成膜方法。 - 前記マイクロ波プラズマは、ラジアルラインスロットアンテナ(RLSA)により生成されている、請求項1に記載の成膜方法。
- 前記プラズマ処理工程は、前記被処理基板の表面近傍において、プラズマの電子温度が1.5eVよりも低く、かつプラズマの電子密度が1×1011cm-3よりも高いマイクロ波プラズマを用いた処理である、請求項1に記載の成膜方法。
- 窒化膜または酸化膜を成膜する、請求項1に記載の成膜方法。
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Cited By (6)
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KR20140019803A (ko) | 2014-02-17 |
JP5660205B2 (ja) | 2015-01-28 |
TW201305380A (zh) | 2013-02-01 |
US20140051263A1 (en) | 2014-02-20 |
US9034774B2 (en) | 2015-05-19 |
KR101657341B1 (ko) | 2016-09-13 |
JPWO2012147680A1 (ja) | 2014-07-28 |
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