JP2014112668A5 - - Google Patents

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JP2014112668A5
JP2014112668A5 JP2013230782A JP2013230782A JP2014112668A5 JP 2014112668 A5 JP2014112668 A5 JP 2014112668A5 JP 2013230782 A JP2013230782 A JP 2013230782A JP 2013230782 A JP2013230782 A JP 2013230782A JP 2014112668 A5 JP2014112668 A5 JP 2014112668A5
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oxide layer
dielectric oxide
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  1. 基板における高アスペクト比ギャップ内に誘電酸化物を共形に蒸着する方法であって、
    (a)約5:1よりも大きな深さ対幅のアスペクト比を各々有する1つ以上のギャップを備える基板を反応チャンバ内に準備し、
    (b)共形膜蒸着(CFD)によって、第1の誘電酸化物層を前記1つ以上のギャップ内に蒸着し、CFDによって前記第1の誘電酸化物層を前記1つ以上のギャップ内に蒸着することは、
    前記基板表面上に第1の反応物質を吸着可能な条件下で、前記反応チャンバ内に前記第1の反応物質を気相状態で導入し、
    前記第1の反応物質が前記基板表面上に吸着された状態で、前記反応チャンバ内に第2の反応物質を気相状態で導入し、前記第2の反応物質は、前記第1の反応物質を前記反応チャンバ外にスイープさせることなく導入され、
    前記基板表面をプラズマに暴露させることによって、前記基板表面上で前記第1の反応物質と前記第2の反応物質との間の反応を促進させ、前記第1の誘電酸化物層を形成すること、を含み、
    (c)プラズマエッチングを用いて、前記第1の誘電酸化物層の一部をエッチングし、前記第1の誘電酸化物層の一部のエッチングは、各ギャップの上面近傍における前記第1の誘電酸化物層の一部のエッチング速度を前記ギャップの底面近傍におけるエッチング速度よりも速くすることにより実行され、これにより前記第1の誘電酸化物層は各ギャップの前記上面から前記底面に向かいテーパする形状を有し、
    (d)CFDによって、前記1つ以上のギャップ内で、前記第1の誘電酸化物層の上に第2の誘電酸化物層を蒸着すること、
    を備える、方法。
  2. 請求項1に記載の方法であって、さらに、
    前記(b)〜(d)を繰り返して、前記1つ以上のギャップを実質的に埋め込むことを備える、方法。
  3. 請求項1に記載の方法であって、
    前記第2の誘電酸化物層を蒸着すること、前記1つ以上のギャップを実質的に埋め込むことを含む、方法。
  4. 請求項1に記載の方法であって、さらに、
    プラズマ活性エッチャントを生成するために遠隔プラズマ内にフッ素含有種を流入させ、
    前記第1の誘電酸化物層と反応させて前記エッチングを実行するために前記プラズマ活性エッチャントを前記反応チャンバ内に流入させること、
    を備える、方法。
  5. 請求項4に記載の方法であって、
    前記フッ素含有種は、三フッ化窒素(NF)を含む、方法。
  6. 請求項4に記載の方法であって、さらに、
    前記第1の誘電酸化物層の一部のエッチングを行う際に、前記反応チャンバ内に水素(H)を流すことを備える、方法。
  7. 請求項6に記載の方法であって、
    前記フッ素含有種に対する水素の流量比は、約1:1〜5:1の間である、方法。
  8. 請求項1に記載の方法であって、
    前記第1の誘電酸化物層及び前記第2の誘電酸化物層は各々、二酸化ケイ素(SiO)を含む、方法。
  9. 請求項1に記載の方法であって、
    前記第1の誘電酸化物層の厚みは、約100Å〜500Åである、方法。
  10. 基板における高アスペクト比ギャップ内に誘電酸化物を共形に蒸着する装置であって、
    反応チャンバと、
    前記反応チャンバに接続されているプラズマ源と、
    制御部であって、
    (a)約5:1よりも大きな深さ対幅のアスペクト比を各々有する1つ以上のギャップを備える基板を前記反応チャンバ内に準備し、
    (b)共形膜蒸着(CFD)によって、第1の誘電酸化物層を前記1つ以上のギャップ内に蒸着し、CFDによって前記第1の誘電酸化物層を前記1つ以上のギャップ内に蒸着することは、
    前記基板表面上に第1の反応物質を吸着可能な条件下で、前記反応チャンバ内に前記第1の反応物質を気相状態で導入し、
    前記第1の反応物質が前記基板表面上に吸着された状態で、前記反応チャンバ内に第2の反応物質を気相状態で導入し、前記第2の反応物質は、前記第1の反応物質を前記反応チャンバ外にスイープさせることなく導入され、
    前記基板表面をプラズマに暴露させることによって、前記基板表面上で前記第1の反応物質と前記第2の反応物質との間の反応を促進させ、前記第1の誘電酸化物層を形成すること、を含み、
    (c)プラズマエッチングを用いて、前記第1の誘電酸化物層の一部をエッチングし、前記第1の誘電酸化物層の一部のエッチングは、各ギャップの上面近傍における前記第1の誘電酸化物層の一部のエッチング速度を前記ギャップの底面近傍におけるエッチング速度よりも速くすることにより実行され、これにより前記第1の誘電酸化物層は各ギャップの前記上面から前記底面に向かいテーパする形状を有し、
    (d)CFDによって、前記1つ以上のギャップ内で、前記第1の誘電酸化物層の上に第2の誘電酸化物層を蒸着すること、を実行する命令を備える制御部、
    を備える装置。
  11. 請求項10に記載の装置であって、
    前記制御部は、さらに、前記(b)〜(d)を繰り返して、前記1つ以上のギャップを実質的に埋め込むことを実行する命令を備える、装置。
  12. 請求項10に記載の装置であって、
    前記第2の誘電酸化物層を蒸着する命令を備える前記制御部は、さらに、前記1つ以上のギャップを実質的に埋め込む命令を備える、装置。
  13. 請求項10に記載の装置であって、
    前記制御部は、さらに、
    プラズマ活性エッチャントを生成するために前記プラズマ源内にフッ素含有種を流入させ、
    前記第1の誘電酸化物層と反応させて前記エッチングを実行するために前記プラズマ活性エッチャントを前記反応チャンバ内に流入させる、ことを実行する命令を備える、装置。
  14. 請求項13に記載の装置であって、
    前記制御部は、さらに、前記第1の誘電酸化物層の一部のエッチングを行う際に、前記反応チャンバ内に水素(H)を流入させることを実行する命令を備える、装置。
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