JP4950888B2 - プラズマ処理を用いて高誘電率層を有するゲート誘電体積層体を改善する方法 - Google Patents
プラズマ処理を用いて高誘電率層を有するゲート誘電体積層体を改善する方法 Download PDFInfo
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- 150000004767 nitrides Chemical class 0.000 claims description 6
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Description
Claims (23)
- ゲート誘電体積層体を特性改善するための方法であって:
基板において形成される高誘電率層を有する前記ゲート誘電体積層体を備える段階;
第1希ガス及び酸素含有ガスを有する第1プロセスガスから中性酸素ラジカルの量及びイオン性酸素ラジカルの量を有する第1プラズマを生成し、前記第1プラズマにおいて前記のイオン性酸素ラジカルの量に対して前記の中性酸素ラジカルの量を増加させるように有効な前記第1プロセスガスについての圧力を選択する段階;
前記ゲート誘電体積層体を前記第1プラズマに曝すことにより前記ゲート誘電体積層体を特性改善する段階;
第2希ガス及び窒素含有ガスを有する第2プロセスガスからイオン性窒素ラジカルの量及び中性窒素ラジカルの量を有する第2プラズマを生成し、前記第2プラズマにおいて前記の中性窒素ラジカルの量に対して前記のイオン性窒素ラジカルの量を増加させるように有効な前記第2プロセスガスについての圧力を選択する段階;並びに
前記第1プラズマを用いずに、前記第2プラズマに前記特性改善されたゲート誘電体積層体を曝す段階;
を有する方法。 - ゲート誘電体積層体を特性改善するための方法であって:
基板において形成される高誘電率層を有する前記ゲート誘電体積層体を備える段階;
第1希ガス及び窒素含有ガスを有する第1プロセスガスからイオン性窒素ラジカルの量及び中性窒素ラジカルの量を有する第1プラズマを生成し、前記第1プラズマにおいて前記の中性窒素ラジカルの量に対して前記のイオン性窒素ラジカルの量を増加させるように有効な前記第1プロセスガスについての圧力を選択する段階;
前記ゲート誘電体積層体を前記第1プラズマに曝すことにより前記ゲート誘電体積層体を特性改善する段階;
第2希ガス及び酸素含有ガスを有する第2プロセスガスから中性酸素ラジカルの量及びイオン性酸素ラジカルの量を有する第2プラズマを生成し、前記第2プラズマにおいて前記のイオン性酸素ラジカルの量に対して前記の中性酸素ラジカルの量を増加させるように有効な前記第2プロセスガスについての圧力を選択する段階;並びに
前記第1プラズマを用いずに、前記第2プラズマに前記特性改善されたゲート誘電体積層体を曝す段階;
を有する方法。 - 請求項1又は2に記載の方法であって、前記基板は、Si基板、Ge含有Si基板、Ge基板又は化合物半導体基板を有する、方法。
- 請求項1又は2に記載の方法であって、前記高誘電率層は、Ta2O5、TiO2、ZrO2、Al2O3、Y2O3、HfSiOx、HfO2、ZrSiOx、TaSiOx、SrOx、SrSiOx、LaOx、LaSiOx、YOx、YSiOx若しくは前記Ta2O5、TiO2、ZrO2、Al2O3、Y2O3、HfSiOx、HfO2、ZrSiOx、TaSiOx、SrOx、SrSiOx、LaOx、LaSiOx、YOx、YSiOxの2つ又はそれ以上の組み合わせを有する、方法。
- 請求項1又は2に記載の方法であって、前記酸素含有ガスは、O2、O3、H2O、H2O2若しくは前記O2、O3、H2O、H2O2の2つ又はそれ以上の組み合わせを有する、方法。
- 請求項1に記載の方法であって、前記第1プロセスガスの圧力は0.5Torr乃至5Torrの範囲内にある、方法。
- 請求項1に記載の方法であって、前記酸素含有ガスに対する前記第1希ガスの比は5乃至20の範囲内にある、方法。
- 請求項1に記載の方法であって、前記第1プロセスガスはAr及びO2を有し、Ar/O2の比は5乃至20の範囲内にある、方法。
- 請求項1又は2に記載の方法であって、前記特性改善する段階において、150℃乃至450℃の範囲内の温度に前記基板を保つ段階を更に有する、方法。
- 請求項1に記載の方法であって、前記特性改善する段階は、5秒乃至60秒の範囲内の時間期間の間に前記第1プラズマに前記ゲート誘電体積層体を曝す段階を有する、方法。
- 請求項1に記載の方法であって、前記特性改善する段階は、前記高誘電率層の酸素含有量を増加させるために十分な時間の間、実行される、方法。
- 請求項1又は2に記載の方法であって、前記ゲート誘電体積層体は、前記高誘電率層と前記基板との間に界面層を更に有する、方法。
- 請求項12に記載の方法であって、前記界面層は、酸化物層、窒化物層又は酸窒化物層を有する、方法。
- 請求項1又は2に記載の方法であって、前記窒素含有ガスは、N2、NH3又は前記N2、NH3の組み合わせを有する、方法。
- 請求項1又は2に記載の方法であって、前記第1希ガス及び前記第2希ガスは、He、Ar、Ne、Kr、Xe若しくは前記He、Ar、Ne、Kr、Xeの2つ又はそれ以上の組み合わせを有する、方法。
- 請求項1に記載の方法であって、前記第2希ガスの圧力は10mTorr乃至400mTorrの範囲内にある、方法。
- 請求項2に記載の方法であって、前記高誘電率層は金属酸化物層又は金属シリケート層を有する、方法。
- 請求項2に記載の方法であって、前記第1希ガスの圧力は10mTorr乃至400mTorrの範囲内にある、方法。
- 請求項2に記載の方法であって、前記窒素含有ガスに対する前記第1希ガスの比は20乃至500の範囲内にある、方法。
- 請求項2に記載の方法であって、前記第1プロセスガスはAr及びN2を有し、Ar/O2の比は20乃至500の範囲内にある、方法。
- 請求項2に記載の方法であって、前記ゲート誘電体積層体は、60秒乃至300秒の範囲内の時間期間の間に前記第1プラズマに曝される、方法。
- 請求項2に記載の方法であって、前記特性改善する段階は、前記高誘電率層の前記窒素含有量を増加させるために十分な時間の間、実行される、方法。
- 請求項2に記載の方法であって、前記第2希ガスの圧力は0.5Torr乃至5Torrの範囲内にある、方法。
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US10/920,990 US7163877B2 (en) | 2004-08-18 | 2004-08-18 | Method and system for modifying a gate dielectric stack containing a high-k layer using plasma processing |
US10/920,990 | 2004-08-18 | ||
PCT/US2005/028610 WO2006023373A1 (en) | 2004-08-18 | 2005-08-11 | A method and system for modifying a gate dielectric stack containing a high-k layer using plasma processing |
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US7163877B2 (en) | 2007-01-16 |
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KR20080009675A (ko) | 2008-01-29 |
WO2006023373A1 (en) | 2006-03-02 |
JP2008510319A (ja) | 2008-04-03 |
CN101006566A (zh) | 2007-07-25 |
TW200618091A (en) | 2006-06-01 |
CN100568462C (zh) | 2009-12-09 |
US20060040483A1 (en) | 2006-02-23 |
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