JP6017361B2 - 成膜方法および成膜装置 - Google Patents
成膜方法および成膜装置 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 52
- 230000001590 oxidative effect Effects 0.000 claims description 85
- 239000007800 oxidant agent Substances 0.000 claims description 65
- 229910044991 metal oxide Inorganic materials 0.000 claims description 39
- 150000004706 metal oxides Chemical class 0.000 claims description 39
- 238000010926 purge Methods 0.000 claims description 33
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 31
- 239000013110 organic ligand Substances 0.000 claims description 23
- 239000002243 precursor Substances 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 15
- 125000002524 organometallic group Chemical group 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 227
- 239000010408 film Substances 0.000 description 111
- 235000012431 wafers Nutrition 0.000 description 34
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 20
- 229910052751 metal Inorganic materials 0.000 description 19
- 239000002184 metal Substances 0.000 description 19
- 230000007246 mechanism Effects 0.000 description 13
- 239000006185 dispersion Substances 0.000 description 10
- 239000003446 ligand Substances 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- 239000010453 quartz Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 229910001928 zirconium oxide Inorganic materials 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000006200 vaporizer Substances 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910013504 M-O-M Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical group [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Description
図1はこの発明の一実施形態に係る成膜方法を実施することが可能な成膜装置の一例を示す縦断面図、図2は図1に示す成膜装置の横断面図である。なお、図2においては、加熱装置を省略している。
次に、この発明の一実施形態に係る成膜方法の一例を説明する。本例は、成膜される膜が酸化物膜であり、酸化物膜の中でも金属酸化物膜を成膜する例である。図3はこの発明の一実施形態に係る成膜方法におけるガス供給タイミングの一例を示すタイミングチャート、図4(A)〜図4(D)は上記一例の主要な工程における被処理体の状態を模式的に示す図である。
O3ガス濃 度: 50〜200g/Nm3
(O2+O3)ガス流量:5〜20slm
処 理 時 間: 30sec〜2min
処 理 温 度: 200〜300℃
処 理 圧 力: 66.5〜266Pa(0.5〜2Torr)
なお、本明細書においては、1Paを133Torrと定義する。また、上記(O2+O3)ガス流量とは、O3発生用のO2の残りと、発生したO3とを合計した合計流量を示している。
O3ガス濃 度: 200〜500g/Nm3
(O2+O3)ガス流量:10〜20slm
処 理 時 間: 30sec〜3min
処 理 温 度: 200〜300℃
処 理 圧 力: 66.5〜266Pa(0.5〜2Torr)
図5(A)は、比較例に係る成膜方法にしたがって成膜された金属酸化物膜を示す断面図、図5(B)は、一実施形態に係る成膜方法の一例にしたがって成膜された金属酸化物膜を示す断面図である。
次に、この発明の一実施形態に係る成膜方法に好適に使用することが可能な酸化剤ガス供給機構の一例を説明する。
その他、この発明はその要旨を逸脱しない範囲で様々に変形することができる。
Claims (9)
- (1) 被処理体が収容された処理室内に、有機金属プリカーサを含む成膜原料ガスを供給する工程と、
(2) 前記(1)工程の後、前記処理室内を排気、及び/又は前記処理室内にパージガスを供給して、前記処理室内に残留するガスを除去する工程と、
(3) 前記処理室内に、酸化剤ガスとしてオゾンガスを供給する工程と、
(4) 前記(3)工程の後、前記処理室内を排気、及び/又は前記処理室内にパージガスを供給して、前記処理室内に残留するガスを除去する工程とを備え、
前記(1)〜(4)工程を複数回繰り返して被処理体上にALDプロセスにより金属酸化物膜を成膜する成膜方法であって、
前記(3)工程が、
(5) 前記処理室に、前記有機金属プリカーサの炭化水素を含む有機リガンドを脱離させるのみで、酸化させない条件で第1の濃度のオゾンガスを供給する第1の供給工程と、
(6) 緻密な膜質の金属酸化物膜を形成するために前記第1の濃度よりも濃度を高めた第2の濃度のオゾンガスを供給する第2の供給工程とを含むことを特徴とする成膜方法。 - 前記(5)工程と前記(6)工程との間に、
(7) 前記処理室内を排気し、前記有機金属プリカーサから脱離された前記有機リガンドを、前記処理室内から除去する工程を、備えることを特徴とする請求項1に記載の成膜方法。 - 前記(5)工程における前記酸化剤ガスの第1の濃度は50g/Nm3以上200g/Nm3以下の範囲から選択され、
前記(6)工程における前記酸化剤ガスの第2の濃度は200g/Nm3以上500g/Nm3以下の範囲から選択されることを特徴とする請求項1または請求項2に記載の成膜方法。 - 前記(5)工程は、オゾナイザによって発生させたオゾンガスを、前記処理室内に供給することで行われ、
前記(6)工程は、前記オゾナイザによって発生させたオゾンガスを濃縮させた後、前記処理室内に供給することで行われることを特徴とする請求項1から請求項3のいずれか一項に記載の成膜方法。 - 前記酸化剤ガスの濃縮は前記(6)工程を除いた前記金属酸化物膜の成膜中に行われ、前記(6)工程を除いた前記金属酸化物膜の成膜中に濃縮オゾンガスを生成することを特徴とする請求項4に記載の成膜方法。
- 前記(6)工程を除いた前記金属酸化物膜の成膜中に生成された前記濃縮オゾンガスを、バッファタンクにチャージし、
前記(6)工程は、前記バッファタンクにチャージされている前記濃縮オゾンガスを、前記処理室内に供給することで行われることを特徴とする請求項5に記載の成膜方法。 - 被処理体を収容し、収容した前記被処理体上に金属酸化物膜を成膜する処理室と、
前記処理室内に、有機金属プリカーサを含む成膜原料ガスを供給する成膜原料ガス供給源と、
前記処理室内に、酸化剤ガスとしてオゾンガスを供給する酸化剤ガス供給源と、
前記処理室内に、パージガスを供給するパージガス供給源と、
前記処理室内を、排気する排気装置と、
前記成膜原料ガス供給源、前記酸化剤ガス供給源、前記パージガス供給源および前記排気装置を制御する制御装置とを備え、
前記制御装置は、請求項1から請求項3のいずれか一項に記載された成膜方法を実行するように、前記成膜原料ガス供給源、前記酸化剤ガス供給源、前記パージガス供給源および前記排気装置を制御することを特徴とする成膜装置。 - 前記酸化剤供給源は、
オゾンガスを発生させるオゾナイザと、
前記オゾナイザから発生されたオゾンガスを濃縮させ、濃縮オゾンガスを生成するオゾンブースタとを備え、
前記制御装置は、請求項4又は請求項5に記載された成膜方法を実行するように、前記オゾナイザおよび前記オゾンブースタを、さらに制御することを特徴とする請求項7に記載の成膜装置。 - 前記酸化剤ガスブースタは、前記濃縮オゾンガスをチャージするバッファタンクをさらに備え、
前記制御装置は、請求項6に記載された成膜方法を実行するように、前記バッファタンクを備えた前記オゾンブースタを、制御することを特徴とする請求項8に記載の成膜装置。
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