JP2005197642A - 半導体素子の酸化膜形成方法 - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 121
- 239000004065 semiconductor Substances 0.000 title claims abstract description 75
- 239000000758 substrate Substances 0.000 claims abstract description 45
- 238000004140 cleaning Methods 0.000 claims abstract description 36
- 238000005530 etching Methods 0.000 claims abstract description 29
- 230000003647 oxidation Effects 0.000 claims description 19
- 238000007254 oxidation reaction Methods 0.000 claims description 19
- 238000000137 annealing Methods 0.000 claims description 16
- 238000009279 wet oxidation reaction Methods 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 238000011065 in-situ storage Methods 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 4
- 230000006866 deterioration Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 45
- 239000012298 atmosphere Substances 0.000 description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 6
- 230000002265 prevention Effects 0.000 description 5
- 238000005468 ion implantation Methods 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- 229910017855 NH 4 F Inorganic materials 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
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Abstract
【解決手段】低電圧素子領域と高電圧素子領域に区分された半導体基板上に第1酸化膜を形成する段階と、低電圧素子領域の第1酸化膜を目標の厚さだけ残留するように、エッチング工程で第1酸化膜を所定の厚さだけエッチングする段階と、前洗浄工程で第1酸化膜を完全に除去する段階と、低電圧素子領域に第2酸化膜を形成する段階とを含む。
【選択図】図2
Description
102、202、302 第1酸化膜
202a 第1酸化膜の残留膜
103、203、303 エッチング防止膜
104、204、305 第2酸化膜
304 犠牲酸化膜
Claims (20)
- 低電圧素子領域と高電圧素子領域に区分された半導体基板上に第1酸化膜を形成する段階と、
前記低電圧素子領域の前記第1酸化膜を目標の厚さだけ残留するように、エッチング工程によって第1酸化膜を所定の厚さだけエッチングする段階と、
前洗浄工程で第1酸化膜を完全に除去する段階と、
前記低電圧素子領域に第2酸化膜を形成する段階とを含む半導体素子の酸化膜形成方法。 - 前記第1酸化膜の残留厚さが20Å〜100Åであることを特徴とする請求項1記載の半導体素子の酸化膜形成方法。
- 前記エッチング工程の際にBOE溶液が使用されることを特徴とする請求項1記載の半導体素子の酸化膜形成方法。
- 前記前洗浄工程の際、H2SO4溶液、希釈されたHF溶液、及びSC−1溶液が使用されることを特徴とする請求項1記載の半導体素子の酸化膜形成方法。
- 前記第1酸化膜を形成する前に、前記半導体基板の表面に残留する異物又は自然酸化膜を除去するために洗浄工程を行う段階をさらに含むことを特徴とする請求項1記載の半導体素子の酸化膜形成方法。
- 前記洗浄工程の際、10:1〜100:1の割合で希釈されたHF溶液と、SC−1溶液が使用されることを特徴とする請求項5記載の半導体素子の酸化膜形成方法。
- 低電圧素子領域と高電圧素子領域に区分された半導体基板上に第1酸化膜を形成する段階と、
前記低電圧素子領域の第1酸化膜をエッチング工程で除去する段階と、
前記低電圧素子領域の半導体基板の表面に発生した損傷を除去するために酸化工程で前記低電圧素子領域の半導体基板の表面を酸化させて犠牲酸化膜を形成する段階と、
前洗浄工程で前記犠牲酸化膜を除去する段階と、
前記低電圧素子領域に第2酸化膜を形成する段階とを含む半導体素子の酸化膜形成方法。 - 前記第1酸化膜を形成する前に、前記半導体基板の表面に残留する異物又は自然酸化膜を除去するために洗浄工程を行う段階をさらに含むことを特徴とする請求項7記載の半導体素子の酸化膜形成方法。
- 前記洗浄工程の際、10:1〜100:1の割合で希釈されたHF溶液と、SC−1溶液が使用されることを特徴とする請求項7記載の半導体素子の酸化膜形成方法。
- 前記第1酸化膜が750℃〜850℃の温度でウェット酸化工程によって形成されることを特徴とする請求項7記載の半導体素子の酸化膜形成方法。
- 前記第1酸化膜が200Å〜400Åの厚さに形成されることを特徴とする請求項7記載の半導体素子の酸化膜形成方法。
- 前記犠牲酸化膜が20Å〜100Åの厚さに形成されることを特徴とする請求項7記載の半導体素子の酸化膜形成方法。
- 前記犠牲酸化膜が750℃〜850℃の温度で行うウェット酸化工程、或いは800℃〜1050℃の温度で行うドライ酸化工程で形成されることを特徴とする請求項7記載の半導体素子の酸化膜形成方法。
- 前記前洗浄工程の際、H2SO4溶液、希釈されたHF溶液、及びSC−1溶液の少なくとも1種以上が使用されることを特徴とする請求項7記載の半導体素子の酸化膜形成方法。
- 前記前洗浄工程の際、前記H2SO4溶液、前記希釈されたHF溶液及び前記SC−1溶液が順次使用されるか、或いは前記希釈されたHF溶液が使用された後前記SC−1溶液が使用されるか、或いは前記SC−1溶液が使用された後希釈されたHF溶液が使用されることを特徴とする請求項14記載の半導体素子の酸化膜形成方法。
- 前記第2酸化膜が750℃〜850℃で行うウェット酸化工程、或いは900℃〜1100℃で行うドライ酸化工程で形成されることを特徴とする請求項7記載の半導体素子の酸化膜形成方法。
- 前記第2酸化膜の形成後、窒素雰囲気のアニーリング工程を行って第2酸化膜を窒化酸化膜にする段階をさらに含むことを特徴とする請求項16記載の半導体素子の酸化膜形成方法。
- 前記窒素雰囲気のアニーリング工程の際、NO又はN2Oガスが供給され、5分〜30分間前記窒素雰囲気のアニーリング工程が行われることを特徴とする請求項17記載の半導体素子の酸化膜形成方法。
- 前記窒素雰囲気のアニーリング工程が300Torr〜760Torrの圧力と800℃〜1100℃で行われることを特徴とする請求項17記載の半導体素子の酸化膜形成方法。
- 前記窒素雰囲気のアニーリング工程がインシチュー方式で行われることを特徴とする請求項17記載の半導体素子の酸化膜形成方法。
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007234964A (ja) * | 2006-03-02 | 2007-09-13 | Siltronic Ag | 半導体基板の洗浄方法 |
CN104835787A (zh) * | 2014-02-08 | 2015-08-12 | 北大方正集团有限公司 | 双栅氧器件的制造方法和双栅氧器件 |
JP2020515082A (ja) * | 2017-01-24 | 2020-05-21 | アプライド マテリアルズ インコーポレイテッドApplied Materials,Incorporated | 誘電体膜の選択的堆積のための方法及び装置 |
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KR100676599B1 (ko) * | 2005-02-28 | 2007-01-30 | 주식회사 하이닉스반도체 | 플래쉬 메모리 소자의 제조방법 |
KR100841845B1 (ko) * | 2006-12-21 | 2008-06-27 | 동부일렉트로닉스 주식회사 | 반도체 장치 제조 방법 |
CN104952805B (zh) * | 2014-03-31 | 2018-11-16 | 中芯国际集成电路制造(上海)有限公司 | 一种制作嵌入式闪存的方法 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007234964A (ja) * | 2006-03-02 | 2007-09-13 | Siltronic Ag | 半導体基板の洗浄方法 |
CN104835787A (zh) * | 2014-02-08 | 2015-08-12 | 北大方正集团有限公司 | 双栅氧器件的制造方法和双栅氧器件 |
JP2020515082A (ja) * | 2017-01-24 | 2020-05-21 | アプライド マテリアルズ インコーポレイテッドApplied Materials,Incorporated | 誘電体膜の選択的堆積のための方法及び装置 |
JP6992089B2 (ja) | 2017-01-24 | 2022-01-13 | アプライド マテリアルズ インコーポレイテッド | 誘電体膜の選択的堆積のための方法及び装置 |
Also Published As
Publication number | Publication date |
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US7030036B2 (en) | 2006-04-18 |
KR20050070530A (ko) | 2005-07-07 |
TW200522210A (en) | 2005-07-01 |
US20050142889A1 (en) | 2005-06-30 |
TWI248648B (en) | 2006-02-01 |
KR100567530B1 (ko) | 2006-04-03 |
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