JP7545583B2 - ゲートオールアラウンドデバイスの形成 - Google Patents
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Description
Claims (32)
- 半導体デバイスを形成する方法であって、
複数のナノシートチャネル層を予洗浄することであって、前記複数のナノシートチャネル層の各々は第1の厚さを有する、予洗浄すること、
前記複数のナノシートチャネル層の各々上に共形犠牲エピタキシャルシリコン層を形成すること、
自然酸化物及び/又は残留物を除去するために、前記共形犠牲エピタキシャルシリコン層を上に有する前記複数のナノシートチャネル層を予洗浄すること、並びに
前記ナノシートチャネル層上にシリコン酸化物層を形成するために、プラズマを使用して前記共形犠牲エピタキシャルシリコン層を酸化することであって、前記ナノシートチャネル層は第2の厚さを有する、酸化することを含む、方法。 - 前記共形犠牲エピタキシャルシリコン層は、0.5nmから2.5nmの範囲の厚さを有する、請求項1に記載の方法。
- 前記第1の厚さは、4nmから8nmの範囲にある、請求項1に記載の方法。
- 前記第2の厚さは、4nmから8nmの範囲にある、請求項1に記載の方法。
- 前記第2の厚さは、2.5nmから7.5nmの範囲にある、請求項1に記載の方法。
- 前記第1の厚さと前記第2の厚さは、実質的に等しい、請求項1に記載の方法。
- 予洗浄前に、複数の積層対内に交互に配置された前記複数のナノシートチャネル層と対応する複数の半導体材料層を備える超格子構造を選択的にエッチングして、前記複数の半導体材料層の各々を除去し、前記超格子構造内の複数のボイド、及びソース領域とドレイン領域との間で延在する前記複数のナノシートチャネル層を形成することを更に含む、請求項1に記載の方法。
- 前記ソース領域を前記超格子構造の第1の端部に隣接して形成し、前記ドレイン領域を前記超格子構造の第2の反対側の端部に隣接して形成することを更に含む、請求項7に記載の方法。
- 前記超格子構造が、基板の上面上に形成される、請求項7に記載の方法。
- 前記共形犠牲エピタキシャルシリコン層はシリコンを含み、前記共形犠牲エピタキシャルシリコン層を形成することは、500℃から800℃の範囲の温度で前記共形犠牲エピタキシャルシリコン層をエピタキシャル成長させることを含む、請求項1に記載の方法。
- 前記複数の半導体材料層はシリコンゲルマニウム(SiGe)を含み、前記複数のナノシートチャネル層はシリコン(Si)を含む、請求項7に記載の方法。
- 前記複数の半導体材料層はシリコン(Si)を含み、前記複数のナノシートチャネル層はシリコンゲルマニウム(SiGe)を含む、請求項7に記載の方法。
- 前記方法は、減圧を壊すことなしに処理チャンバ内で実行される、請求項1に記載の方法。
- 前記複数のナノシートチャネル層を予洗浄することは、ドライエッチングプロセスとウェットエッチングプロセスのうちの1以上を含む、請求項1に記載の方法。
- 前記共形犠牲エピタキシャルシリコン層を酸化することは、周囲圧力にある水素(H2)ガス及び酸素(O2)ガスの雰囲気内での500℃から900℃の範囲の温度における前記共形犠牲エピタキシャルシリコン層のラジカルプラズマ酸化(RPO)を含む、請求項1に記載の方法。
- 前記酸化物層上に高誘電率誘電体層を形成すること、及び
前記高誘電率誘電体層上に導電層を形成することを更に含む、請求項1に記載の方法。 - 半導体デバイスを形成する方法であって、
複数のナノシートチャネル層を予洗浄することであって、前記複数のナノシートチャネル層の各々は第1の厚さを有する、予洗浄すること、
前記複数のナノシートチャネル層の各々上に共形犠牲エピタキシャル層を形成すること、
前記共形犠牲エピタキシャル層を上に有する前記複数のナノシートチャネル層をアニーリングすること、及び
前記複数のナノシートチャネル層の各々上に酸化物層を形成するために、プラズマを使用して前記共形犠牲エピタキシャル層を酸化することであって、前記複数のナノシートチャネル層の各々は第2の厚さを有する、酸化することを含む、方法。 - 前記共形犠牲エピタキシャル層は、0.5nmから2.5nmの範囲の厚さを有する、請求項17に記載の方法。
- 前記第1の厚さは、4nmから8nmの範囲にある、請求項17に記載の方法。
- 前記第2の厚さは、2.5nmから10nmの範囲にある、請求項17に記載の方法。
- 前記第1の厚さと前記第2の厚さは、実質的に等しい、請求項17に記載の方法。
- 予洗浄前に、複数の積層対内に交互に配置された前記複数のナノシートチャネル層と対応する複数の半導体材料層を備える超格子構造を選択的にエッチングして、前記複数の半導体材料層の各々を除去し、前記超格子構造内の複数のボイド、及びソース領域とドレイン領域との間で延在する前記複数のナノシートチャネル層を形成することを更に含む、請求項17に記載の方法。
- 前記ソース領域を前記超格子構造の第1の端部に隣接して形成し、前記ドレイン領域を前記超格子構造の第2の反対側の端部に隣接して形成することを更に含む、請求項22に記載の方法。
- 前記超格子構造を基板の上面上に形成することを更に含む、請求項22に記載の方法。
- 前記共形犠牲エピタキシャル層はシリコンを含み、前記共形犠牲エピタキシャル層を形成することは、500℃から800℃の範囲の温度で前記共形犠牲エピタキシャル層をエピタキシャル成長させることを含む、請求項17に記載の方法。
- 前記複数の半導体材料層はシリコンゲルマニウム(SiGe)を含み、前記複数のナノシートチャネル層はシリコン(Si)を含む、請求項22に記載の方法。
- 前記複数の半導体材料層はシリコン(Si)を含み、前記複数のナノシートチャネル層はシリコンゲルマニウム(SiGe)を含む、請求項22に記載の方法。
- 前記方法は、減圧を壊すことなしに処理チャンバ内で実行される、請求項17に記載の方法。
- 前記複数のナノシートチャネル層を予洗浄することは、ドライエッチングプロセスとウェットエッチングプロセスのうちの1以上を含む、請求項17に記載の方法。
- 前記共形犠牲エピタキシャル層を酸化することは、周囲圧力にある水素(H2)ガス及び酸素(O2)ガスの雰囲気内での500℃から900℃の範囲の温度における前記共形犠牲エピタキシャル層のラジカルプラズマ酸化(RPO)を含む、請求項17に記載の方法。
- 前記複数のナノシートチャネル層は、水素(H2)を含む雰囲気内で5Torrから20Torrの範囲の圧力において600℃から900℃の範囲の温度でアニーリングされる、請求項17に記載の方法。
- 前記酸化物層上に高誘電率誘電体層を形成すること、及び
前記高誘電率誘電体層上に導電層を形成することを更に含む、請求項17に記載の方法。
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