JP7293530B2 - スプリットゲート横方向拡張ドレインmosトランジスタの構造及びプロセス - Google Patents
スプリットゲート横方向拡張ドレインmosトランジスタの構造及びプロセス Download PDFInfo
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- JP7293530B2 JP7293530B2 JP2018543025A JP2018543025A JP7293530B2 JP 7293530 B2 JP7293530 B2 JP 7293530B2 JP 2018543025 A JP2018543025 A JP 2018543025A JP 2018543025 A JP2018543025 A JP 2018543025A JP 7293530 B2 JP7293530 B2 JP 7293530B2
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Description
Claims (18)
- 半導体デバイスであって、
p型である半導体材料を含む基板と、
スプリットゲートトランジスタであって、
前記基板に配置されて前記基板の頂部表面まで延在するp型のボディと、
前記基板に配置されて前記ボディに隣接するn型のドレインドリフト領域であって、前記ボディよりも浅く前記基板内に延在し、前記ボディと前記ドレインドリフト領域との間の境界が前記基板の前記頂部表面まで延在する、前記ドレインドリフト領域と、
前記基板に配置されて前記ドレインドリフト領域に隣接するドレインウェル領域であって、前記ドレインドリフト領域よりも深く前記基板内に延在し、前記ドレインドリフト領域よりも大きい不純物濃度を有する、前記ドレインウェル領域と、
前記ドレインウェル領域に配置されるドレイン領域と、
前記基板の前記頂部表面の上に配置されるゲート誘電体層であって、前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の前記境界の上に位置し、前記ボディの上に少なくとも部分的に延在して前記ドレインドリフト領域の上に少なくとも部分的に延在する、前記ゲート誘電体層と、
前記ゲート誘電体層の上に配置される第1のゲートであって、前記ボディの上に少なくとも部分的に延在する、前記第1のゲートと、
前記第1のゲートに横方向に近接して前記ゲート誘電体層の上に配置される第2のゲートであって、前記ドレインドリフト領域の上に少なくとも部分的に延在し、前記第2のゲートの第1の部分がフィールド酸化物によって前記ドレインドリフト領域から垂直方向に分離され、前記第2のゲートの第2の部分が前記フィールド酸化物ではなくて前記ゲート誘電体層によって前記ドレインドリフト領域から垂直方向に分離され、10ナノメートル~250ナノメートルのギャップによって前記第1のゲートから横方向に分離され、前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の境界が、前記第1のゲートと前記第2のゲートと前記第1のゲートと前記第2のゲートとの間の前記ギャップとを含む領域の下に位置する、前記第2のゲートと、
を含む、前記スプリットゲートトランジスタと、
を含む、半導体デバイス。 - 請求項1に記載の半導体デバイスであって、
前記第1のゲートと前記第2のゲートとの間の前記ギャップに配置される誘電材料を更に含む、半導体デバイス。 - 請求項1に記載の半導体デバイスであって、
前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の前記境界が前記第1のゲートの下に位置する、半導体デバイス。 - 請求項1に記載の半導体デバイスであって、
前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の前記境界が前記第1のゲートと前記第2のゲートとの間の前記ギャップの下に位置する、半導体デバイス。 - 請求項1に記載の半導体デバイスであって、
前記第1のゲートが前記第2のゲートに上に重ならず、第2のゲートが前記第1のゲートに上に重ならない、半導体デバイス。 - 請求項1に記載の半導体デバイスであって、
前記第1のゲートと前記第2のゲートとの一方が、前記第1のゲートと前記第2のゲートとの他方に上に重なる、半導体デバイス。 - 請求項1に記載の半導体デバイスであって、
前記第2のゲートが前記半導体デバイスのゲート電圧ノードに電気的に結合される、半導体デバイス。 - 請求項1に記載の半導体デバイスであって、
前記第2のゲートが前記半導体デバイスのゲート信号ノードに電気的に結合される、半導体デバイス。 - 半導体デバイスであって、
p型である半導体材料を含む基板と、
スプリットゲートトランジスタであって、
前記基板に配置されて前記基板の頂部表面まで延在するp型のボディと、
前記基板に配置されて前記ボディに隣接するn型のドレインドリフト領域であって、前記ボディよりも浅く前記基板内に延在し、前記ボディと前記ドレインドリフト領域との間の境界が前記基板の前記頂部表面まで延在する、前記ドレインドリフト領域と、
前記基板の前記頂部表面の上に配置されるゲート誘電体層であって、前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の前記境界の上に位置し、前記ボディの上に少なくとも部分的に延在して前記ドレインドリフト領域の上に少なくとも部分的に延在する、前記ゲート誘電体層と、
前記ゲート誘電体層の上に配置される第1のゲートであって、前記ボディの上に少なくとも部分的に延在する、前記第1のゲートと、
前記第1のゲートに横方向に近接して前記ゲート誘電体層の上に配置される第2のゲートであって、前記ドレインドリフト領域の上に少なくとも部分的に延在し、10ナノメートル~250ナノメートルのギャップによって前記第1のゲートから横方向に分離され、前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の前記境界が、前記第2のゲートの下に位置し、前記第1のゲートの下に位置しない、前記第2のゲートと、
を含む、前記スプリットゲートトランジスタと、
を含む、半導体デバイス。 - 半導体デバイスを形成する方法であって、
p型半導体材料を含む基板を提供することと、
前記基板に前記半導体デバイスのスプリットゲートトランジスタのn型のドレインドリフト領域を形成することであって、前記ドレインドリフト領域が前記スプリットゲートトランジスタのp型のボディに隣接して前記ボディよりも浅く前記基板内に延在する、前記ドレインドリフト領域を形成することと、
前記ドレインドリフト領域に隣接するドレインウェル領域を形成することであって、前記ドレインウェル領域がn型であって前記ドレインドリフト領域よりも大きい不純物濃度を有し、前記ドレインウェル領域が前記ドレインドリフト領域よりも深く前記基板内に延在する、前記ドレインウェル領域を形成することと、
前記基板の頂部表面の上に前記スプリットゲートトランジスタのゲート誘電体層を形成することであって、前記ゲート誘電体層が前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の境界の上に位置し、前記ゲート誘電体層が前記ボディの上に少なくとも部分的に延在して前記ドレインドリフト領域の上に少なくとも部分的に延在する、前記ゲート誘電体層を形成することと、
前記ゲート誘電体層の上に前記スプリットゲートトランジスタの第1のゲートを形成することであって、前記第1のゲートが前記ボディの上に少なくとも部分的に延在する、前記第1のゲートを形成することと、
前記第1のゲートに横方向に近接して、前記ゲート誘電体層の上に前記スプリットゲートトランジスタの第2のゲートを形成することであって、前記第2のゲートが前記ドレインドリフト領域の上に少なくとも部分的に延在し、前記第2のゲートの第1の部分がフィールド酸化物によって前記ドレインドリフト領域から垂直方向に分離され、前記第2のゲートの第2の部分が前記フィールド酸化物ではなくて前記ゲート誘電体層によって前記ドレインドリフト領域から垂直方向に分離され、前記第2のゲートが10ナノメートル~250ナノメートルのギャップによって前記第1のゲートから横方向に分離され、前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の前記境界が、前記第1のゲートと前記第2のゲートと前記第1のゲートと前記第2のゲートとの間の前記ギャップとを含む領域の下に位置する、前記第2のゲートを形成することと、
を含む、方法。 - 請求項10に記載の方法であって、
前記第1のゲートと前記第2のゲートとの間の前記ギャップに誘電材料を形成することを更に含む、方法。 - 請求項10に記載の方法であって、
前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の前記境界が前記第1のゲートの下に位置するように、前記第1のゲートが形成される、方法。 - 請求項10に記載の方法であって、
前記第1のゲートを形成することと前記第2のゲートを形成することとが、
前記ゲート誘電体層の上にゲート材料の層を形成することと、
前記ゲート材料の層の上にゲートマスクを形成することであって、前記ゲートマスクが、前記第1のゲートのためのエリアを覆う第1のマスク要素と、前記第2のゲートのためのエリアを覆う第2のマスク要素とを含む、前記ゲートマスクを形成することと、
前記第1のゲートと前記第2のゲートとを形成するために前記ゲートマスクによって露出される箇所の前記ゲート材料の層を除去することと、
その後、前記ゲートマスクを除去することと、
を含む、方法。 - 請求項10に記載の方法であって、
前記第1のゲートを形成することと前記第2のゲートを形成することとが、
前記ゲート誘電体層の上にゲート材料の第1の層を形成することと、
前記ゲート材料の第1層の上に第1のゲートマスクを形成することであって、前記第1のゲートマスクが前記第1のゲートのためのエリアを覆う、前記第1のゲートマスクを形成することと、
前記第1のゲートを形成するために前記第1のゲートマスクによって露出される箇所の前記ゲート材料の第1の層を除去することと、
その後、前記第1のゲートマスクを除去することと、
前記ゲート誘電体層の上と前記第1のゲートの上とにゲート材料の第2の層を形成することと、
前記ゲート材料の第2の層の上に第2のゲートマスクを形成することであって、前記第2のゲートマスクが前記第1のゲートに部分的に上に重なる前記第2のゲートのためのエリアを覆う、前記第2のゲートマスクを形成することと、
前記第2のゲートを形成するために前記第2のゲートマスクによって露出される箇所の前記ゲート材料の第2の層を除去することであって、前記第2のゲートが前記第1のゲートに部分的に上に重なる、前記ゲート材料の第2の層を除去することと、
その後、前記第2のゲートマスクを除去することと、
を含む、方法。 - 請求項10に記載の方法であって、
シャロートレンチアイソレーション(STI)プロセスによって前記フィールド酸化物を形成することであって、前記フィールド酸化物の要素が前記ドレインドリフト領域の一部の上に形成され、前記第2のゲートが前記ドレインドリフト領域の上のフィールド酸化物の前記要素に部分的に上に重なるように、前記フィールド酸化物を形成することを更に含む、方法。 - 請求項10に記載の方法であって、
50ナノメートル~150ナノメートルの厚みの薄いフィールド酸化物としての前記フィールド酸化物を形成することであって、前記薄いフィールド酸化物の要素が前記ドレインドリフト領域の一部の上に形成され、前記第2のゲートが前記ドレインドリフト領域の上の薄いフィールド酸化物の前記要素に部分的に上に重なるように、前記フィールド酸化物を形成することを更に含む、方法。 - 半導体デバイスを形成する方法であって、
p型半導体材料を含む基板を提供することと、
前記基板に前記半導体デバイスのスプリットゲートトランジスタのn型のドレインドリフト領域を形成することであって、前記ドレインドリフト領域が前記スプリットゲートトランジスタのp型のボディに隣接して前記ボディよりも浅く前記基板内に延在する、前記ドレインドリフト領域を形成することと、
前記基板の頂部表面の上に前記スプリットゲートトランジスタのゲート誘電体層を形成することであって、前記ゲート誘電体層が前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の境界の上に位置し、前記ゲート誘電体層が前記ボディの上に少なくとも部分的に延在して前記ドレインドリフト領域の上に少なくとも部分的に延在する、前記ゲート誘電体層を形成することと、
前記ゲート誘電体層の上に前記スプリットゲートトランジスタの第1のゲートを形成することであって、前記第1のゲートが前記ボディの上に少なくとも部分的に延在する、前記第1のゲートを形成することと、
前記第1のゲートに横方向に近接して、前記ゲート誘電体層の上に前記スプリットゲートトランジスタの第2のゲートを形成することであって、前記第2のゲートが前記ドレインドリフト領域の上に少なくとも部分的に延在し、前記第2のゲートの第1の部分がフィールド酸化物によって前記ドレインドリフト領域から垂直方向に分離され、前記第2のゲートの第2の部分が前記フィールド酸化物ではなくて前記ゲート誘電体層によって前記ドレインドリフト領域から垂直方向に分離され、前記第2のゲートが10ナノメートル~250ナノメートルのギャップによって前記第1のゲートから横方向に分離され、前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の前記境界が前記第2のゲートの下に位置して前記第1のゲートの下に位置しないように前記第2のゲートが形成される、前記第2のゲートを形成することと、
を含む、方法。 - 半導体デバイスを形成する方法であって、
p型半導体材料を含む基板を提供することと、
前記基板に前記半導体デバイスのスプリットゲートトランジスタのn型のドレインドリフト領域を形成することであって、前記ドレインドリフト領域が前記スプリットゲートトランジスタのp型のボディに隣接して前記ボディよりも浅く前記基板内に延在する、前記ドレインドリフト領域を形成することと、
前記基板の頂部表面の上に前記スプリットゲートトランジスタのゲート誘電体層を形成することであって、前記ゲート誘電体層が前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の境界の上に位置し、前記ゲート誘電体層が前記ボディの上に少なくとも部分的に延在して前記ドレインドリフト領域の上に少なくとも部分的に延在する、前記ゲート誘電体層を形成することと、
前記ゲート誘電体層の上に前記スプリットゲートトランジスタの第1のゲートを形成することであって、前記第1のゲートが前記ボディの上に少なくとも部分的に延在する、前記第1のゲートを形成することと、
前記第1のゲートに横方向に近接して、前記ゲート誘電体層の上に前記スプリットゲートトランジスタの第2のゲートを形成することであって、前記第2のゲートが前記ドレインドリフト領域の上に少なくとも部分的に延在し、前記第2のゲートの第1の部分がフィールド酸化物によって前記ドレインドリフト領域から垂直方向に分離され、前記第2のゲートの第2の部分が前記フィールド酸化物ではなくて前記ゲート誘電体層によって前記ドレインドリフト領域から垂直方向に分離され、前記第2のゲートが10ナノメートル~250ナノメートルのギャップによって前記第1のゲートから横方向に分離され、前記基板の前記頂部表面における前記ボディと前記ドレインドリフト領域との間の前記境界が前記第1のゲートと前記第2のゲートとの間の前記ギャップの下に位置して前記第1のゲートの下に位置しないように、前記第1のゲートと前記第2のゲートとが形成される、前記第2のゲートを形成することと、
を含む、方法。
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