JP7352649B2 - 半導体プラグが堆積された三次元メモリデバイス及びその形成方法 - Google Patents
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Description
Claims (14)
- 三次元(3D)メモリデバイスであって、
基板と、
前記基板上の複数の交互に配置された導体層及び誘電体層を含むメモリデッキと、
前記メモリデッキを垂直に貫通するメモリストリングと、
を備え、
前記複数の交互に配置された導体層のうちの底部導体層及び誘電体層は、前記メモリストリングと交差し、前記メモリストリングに接触し、
前記メモリストリングが、前記メモリストリングの下部で前記基板に接続された半導体プラグを備え、
前記半導体プラグ全体が、前記基板の表面よりも上方に位置し、
前記半導体プラグの上面は、前記底部導体層の上面よりも低く、
前記半導体プラグは、堆積されたポリシリコンプラグである、三次元(3D)メモリデバイス。 - 前記メモリストリングが、前記メモリデッキを垂直に貫通した開口の側壁に沿って、かつ前記半導体プラグに接触するように前記メモリストリングに沿って延在する半導体チャネルを備える、請求項1に記載の3Dメモリデバイス。
- 前記メモリデッキと前記基板との間に底部誘電体層をさらに備え、前記半導体プラグは前記底部誘電体層内にあり、前記底部誘電体層は約10nm~約50nmの範囲内の厚さを有する、請求項2に記載の3Dメモリデバイス。
- 前記メモリデッキ及び前記底部誘電体層を貫通して前記基板に接触する支持ピラーをさらに備える、請求項3に記載の3Dメモリデバイス。
- 前記支持ピラーの横径は、前記メモリストリングの横径よりも小さく、前記支持ピラーは酸化ケイ素で充填されている、請求項4に記載の3Dメモリデバイス。
- 三次元(3D)メモリデバイスであって、
基板と、
それぞれが前記基板の上に複数の交互に配置された導体層及び誘電体層を有する複数のメモリデッキを備えるメモリスタックと、
それぞれのメモリサブストリングを各メモリデッキが有する、前記メモリスタックを垂直に貫通する複数のメモリサブストリングを有するメモリストリングと、
を備え、
前記複数の交互に配置された導体層のうちの底部導体層及び誘電体層は、前記メモリストリングと交差し、前記メモリストリングに接触し、
前記メモリストリングが、前記メモリストリングの下部で前記基板に接続された半導体プラグを備え、
前記半導体プラグ全体が、前記基板の表面よりも上方に位置し、
前記半導体プラグの上面は、前記底部導体層の上面よりも低く、
前記半導体プラグは、堆積されたポリシリコンプラグを含む、三次元(3D)メモリデバイス。 - 前記メモリストリングが、前記メモリデッキを垂直に貫通した開口の側壁に沿って、かつ前記半導体プラグに接触するように前記メモリストリングに沿って延在する半導体チャネルを備える、請求項6に記載の3Dメモリデバイス。
- 前記メモリスタックと前記基板との間に底部誘電体層をさらに備え、前記半導体プラグは前記底部誘電体層内にあり、前記底部誘電体層は約10nm~約50nmの範囲内の厚さを有する、請求項7に記載の3Dメモリデバイス。
- 三次元(3D)メモリデバイスを形成するための方法であって、
基板の上に底部犠牲層を形成することと、
前記底部犠牲層の上に複数の交互に配置された犠牲層及び誘電体層を含む誘電体デッキを形成することと、
前記誘電体デッキ及び前記底部犠牲層を貫通し、前記基板に接触するメモリストリングを形成することと、
前記誘電体デッキ及び前記底部犠牲層を貫通して前記基板に接触する支持ピラーを形成することと、
前記底部犠牲層を前記誘電体デッキと前記基板との間の底部誘電体層と置き換えることと、
前記誘電体デッキを通って前記基板内に延在するソース構造体を形成することと、を含む、方法。 - 前記底部犠牲層を形成することは、前記基板上の前記誘電体デッキの上にエッチング停止材料の層を堆積させることを含み、前記エッチング停止材料は、複数の犠牲層の材料とは異なり、前記エッチング停止材料の前記層を堆積させることが、タングステン、コバルト、アルミニウム、又は銅のうちの少なくとも1つを堆積させることを含む、請求項9に記載の方法。
- 前記メモリストリングを形成することは、
前記誘電体デッキを貫通する開口を形成して前記底部犠牲層を露出させることと、
前記開口の下部に半導体プラグを形成することであって、前記半導体プラグは、前記底部犠牲層を貫通し、前記基板に接触する、半導体プラグを形成することと、
前記開口の側壁の上に前記基板に接触して、ブロッキング材料の層、メモリ材料の層、トンネル材料の層、及び半導体材料の層を順次堆積させることと、
前記メモリ材料の前記層、前記トンネル材料の前記層、及び前記半導体材料の前記層の下に、前記底部犠牲層を貫通するプラグ開口を形成し、前記基板を露出させることと、
前記半導体材料の前記層の上に前記半導体材料の別の層を堆積させて前記プラグ開口を充填することと、
誘電体コア材料を堆積させて前記開口を充填することと、
前記誘電体デッキを平坦化して、前記誘電体コア材料の層、前記半導体材料の前記層、前記トンネル材料の前記層、及び前記メモリ材料の前記層の上部を除去することと、
前記誘電体コア材料の前記層、前記半導体材料の前記層、前記トンネル材料の前記層、及び前記メモリ材料の前記層の上部を除去して、前記誘電体コア材料の前記層、前記半導体材料の前記層、前記トンネル材料の前記層、及び前記メモリ材料の前記層の上にチャネルプラグ開口を形成することと、
導電性材料の層を堆積させて、前記チャネルプラグ開口を充填し、それぞれ誘電体コア、半導体層、トンネル層、メモリ層、及びブロッキング層を形成することと、
前記導電性材料の層を平坦化して前記チャネルプラグを形成することと、を含む、請求項9に記載の方法。 - 前記プラグ開口を形成することは、
ドライエッチングプロセスを実行し、前記ブロッキング材料の前記層、前記メモリ材料の前記層、前記トンネル材料の前記層、及び前記半導体材料の前記層の一部を除去して前記底部犠牲層を露出させ、前記ブロッキング材料の前記層、前記メモリ材料の前記層、前記トンネル材料の前記層、及び前記半導体材料の前記層を貫通する初期プラグ開口を形成して前記底部犠牲層を露出させることであって、前記初期プラグ開口の横方向寸法は、前記プラグ開口の横方向寸法よりも小さい、ドライエッチングプロセスを実行することと、
ウェットエッチングプロセスを実行し、前記初期プラグ開口の前記横方向寸法及び垂直方向寸法を増加させ、前記ブロッキング材料の前記層、前記メモリ材料の前記層、前記トンネル材料の前記層、及び前記半導体材料の前記層の下部、並びに前記底部犠牲層の一部を除去して前記基板を露出させ、したがって、前記プラグ開口が前記メモリ材料の前記層、前記トンネル材料の前記層、及び前記半導体材料の前記層の下にあり、前記基板を露出させることと、
を含む、請求項11に記載の方法。 - 前記底部犠牲層を底部誘電体層と置き換えることは、
ピラー開口を形成することと同じ工程で、前記誘電体デッキ及び前記底部犠牲層を貫通するスリット構造を形成し、前記基板を露出させることと、
前記スリット構造の上に堆積された誘電体材料を除去して、前記底部犠牲層及び前記基板を露出させることと、
前記底部犠牲層を除去することと、
前記誘電体デッキと前記基板との間に底部誘電体層を形成することと、を含む、請求項9に記載の方法。 - 前記底部犠牲層の前記除去が、ウェットエッチングプロセスを含み、
前記底部誘電体層の形成は、
シリコンを含む前記基板を酸化することによって前記基板の自然酸化物を形成することと、
酸素ガス及び水素ガスを使用してin-situ水蒸気生成酸化プロセスを実行することと、
酸素ガス及びシランガスを使用してシラン酸化反応を実行することと、のうちの少なくとも1つを含む、請求項13に記載の方法。
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