JP2021034407A - 成膜方法 - Google Patents
成膜方法 Download PDFInfo
- Publication number
- JP2021034407A JP2021034407A JP2019149132A JP2019149132A JP2021034407A JP 2021034407 A JP2021034407 A JP 2021034407A JP 2019149132 A JP2019149132 A JP 2019149132A JP 2019149132 A JP2019149132 A JP 2019149132A JP 2021034407 A JP2021034407 A JP 2021034407A
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- Prior art keywords
- gas
- silicon oxide
- oxide film
- rotary table
- region
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 238000000151 deposition Methods 0.000 title claims abstract description 9
- 239000007789 gas Substances 0.000 claims abstract description 256
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 49
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 34
- 230000003647 oxidation Effects 0.000 claims abstract description 21
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000001590 oxidative effect Effects 0.000 claims abstract description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000003213 activating effect Effects 0.000 claims abstract description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims description 51
- 238000002407 reforming Methods 0.000 claims description 28
- 238000001179 sorption measurement Methods 0.000 claims description 15
- 238000010926 purge Methods 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- 238000009832 plasma treatment Methods 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 238000005530 etching Methods 0.000 abstract description 16
- 239000010408 film Substances 0.000 description 101
- 235000012431 wafers Nutrition 0.000 description 57
- 239000012495 reaction gas Substances 0.000 description 41
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 17
- 230000002093 peripheral effect Effects 0.000 description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 229910052710 silicon Inorganic materials 0.000 description 11
- 239000010703 silicon Substances 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001878 scanning electron micrograph Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 229910007991 Si-N Inorganic materials 0.000 description 3
- 229910006294 Si—N Inorganic materials 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000003028 elevating effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000006187 pill Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02337—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour
- H01L21/0234—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour treatment by exposure to a plasma
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- C—CHEMISTRY; METALLURGY
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
- C23C16/04—Coating on selected surface areas, e.g. using masks
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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
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- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/40—Oxides
- C23C16/401—Oxides containing silicon
- C23C16/402—Silicon dioxide
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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]
- C23C16/45544—Atomic layer deposition [ALD] characterized by the apparatus
- C23C16/45548—Atomic layer deposition [ALD] characterized by the apparatus having arrangements for gas injection at different locations of the reactor for each ALD half-reaction
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- C—CHEMISTRY; METALLURGY
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- C23C16/45563—Gas nozzles
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- 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
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- 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
- C23C16/513—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 plasma jets
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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
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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
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- H01L21/02107—Forming insulating materials on a substrate
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- 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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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
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- H01L21/02107—Forming insulating materials on a substrate
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- 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
- H01L21/02219—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 nitrogen
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- 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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- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
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- 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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- 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
- H01L21/32—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 using masks
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- Engineering & Computer Science (AREA)
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- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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Abstract
【解決手段】本開示の一態様による成膜方法は、表面に凹部が形成された基板の上にアミノシランガスを吸着させるステップと、前記基板に酸化ガスを供給し、前記基板の上に吸着した前記アミノシランガスを酸化して前記基板の上にシリコン酸化膜を堆積させるステップと、前記シリコン酸化膜に窒素ガス及び水素ガスを含む混合ガスをプラズマにより活性化して供給し、前記シリコン酸化膜の改質処理を行うステップと、を有する。
【選択図】図9
Description
一実施形態の成膜方法を実施するのに好適な成膜装置について説明する。図1から図3までを参照すると、成膜装置は、ほぼ円形の平面形状を有する扁平な真空容器1と、真空容器1内に設けられ、真空容器1の中心に回転中心を有する回転テーブル2と、を備えている。真空容器1は、有底の円筒形状を有する容器本体12と、容器本体12の上面に対して、例えばOリング等のシール部材13(図1)を介して気密に着脱可能に配置される天板11とを有している。
一実施形態の成膜方法について、前述の成膜装置を用いてシリコン酸化膜(SiO2膜)を成膜する場合を例に挙げて説明する。図9は、一実施形態の成膜方法の流れを示す図である。図10は、一実施形態の成膜方法を説明するための模式図である。一実施形態では、図10(a)に示されるように、表面にトレンチTが形成されたウエハWのトレンチTにシリコン酸化膜を埋め込み成膜する場合を例に挙げて説明する。なお、トレンチTは、ウエハWの表面Uに形成されている凹部の一例であり、トレンチTの他、ビアホール等が形成されていてもよい。また、ウエハWの表面にシリコン窒化膜等の下地膜が形成されていてもよい。
改質ガスとしてAr/N2/H2ガスをプラズマで活性化して供給することにより、後のエッチング工程によってシームが生じにくいシリコン酸化膜を成膜できるメカニズムについて説明する。
一実施形態の成膜方法を実施し、実施結果の評価を行った実施例1について説明する。実施例1では、ウエハWとして、表面にトレンチが形成されたシリコンウエハを用いた。
処理圧力:240Pa
アミノシランガス:ジイソピロピルアミノシラン(DIPAS)ガス
酸化ガス:O3ガス
改質ガス:Ar/O2ガス、Ar/N2ガス、Ar/N2/H2ガス
高周波電力:4000W
回転テーブル2の回転速度:20rpm
続いて、走査型電子顕微鏡(SEM:Scanning Electron Microscope)を用いて、トレンチ内の一部分に埋め込まれたシリコン酸化膜を観察することにより、シリコン酸化膜の段差被覆性を評価した。
2 回転テーブル
P1 アミノシランガス吸着領域
P2 酸化ガス供給領域
P3 プラズマ処理領域
D 分離領域
Claims (8)
- 表面に凹部が形成された基板の上にアミノシランガスを吸着させるステップと、
前記基板に酸化ガスを供給し、前記基板の上に吸着した前記アミノシランガスを酸化して前記基板の上にシリコン酸化膜を堆積させるステップと、
前記シリコン酸化膜に窒素ガス及び水素ガスを含む混合ガスをプラズマにより活性化して供給し、前記シリコン酸化膜の改質処理を行うステップと、
を有する、
成膜方法。 - 前記改質処理を行うステップでは、NH活性種を生成する、
請求項1に記載の成膜方法。 - 前記窒素ガスの供給量に対する前記水素ガスの供給量の比は、1〜3の範囲内である、
請求項1又は2に記載の成膜方法。 - 前記アミノシランガスを吸着させるステップ、前記シリコン酸化膜を堆積させるステップ及び前記改質処理を行うステップは、繰り返し行われる、
請求項1乃至3のいずれか一項に記載の成膜方法。 - 前記アミノシランガスを吸着させるステップ、前記シリコン酸化膜を堆積させるステップ及び前記改質処理を行うステップは、前記凹部に前記シリコン酸化膜が充填されるまで繰り返される、
請求項1乃至4のいずれか一項に記載の成膜方法。 - 前記アミノシランガスを吸着させるステップと前記シリコン酸化膜を堆積させるステップとの間、及び前記改質処理を行うステップと前記アミノシランガスを吸着させるステップとの間には、前記基板に第1のパージガス及び第2のパージガスを供給するステップが各々設けられている、
請求項1乃至5のいずれか一項に記載の成膜方法。 - 前記基板は、真空容器内に設けられた回転テーブル上の周方向に沿って配置され、
前記真空容器内の前記回転テーブルの上方には、前記回転テーブルの回転方向に沿ってアミノシランガス吸着領域と、第1の分離領域と、酸化ガス供給領域と、プラズマ処理領域と、第2の分離領域とが設けられ、前記回転テーブルを回転させることにより前記アミノシランガスを吸着させるステップ、前記第1のパージガスを供給するステップ、前記シリコン酸化膜を堆積させるステップ、前記改質処理を行うステップ及び前記第2のパージガスを供給するステップが繰り返される、
請求項6に記載の成膜方法。 - 前記基板の表面には、シリコン窒化膜からなる下地膜が予め形成されている、
請求項1乃至7のいずれか一項に記載の成膜方法。
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