JP4995907B2 - プラズマを閉じ込めるための装置、プラズマ処理装置及び半導体基板の処理方法 - Google Patents
プラズマを閉じ込めるための装置、プラズマ処理装置及び半導体基板の処理方法 Download PDFInfo
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Description
Claims (27)
- 下部電極と対面する上部電極を含むプラズマ処理装置で形成されたプラズマを閉じ込めるための装置であって、
前記下部電極はその上に基板を支持するように構成され、
プラズマは稼動中に前記基板と前記上部電極との間に生成され、
前記装置は、
前記上部電極を同心円状に囲むように構成された誘電性支持リングと、
前記誘電性支持リングの上に搭載された複数のコイル部と、
を備え、
前記複数のコイル部は、夫々前記誘電性支持リングの半径方向に置かれた強磁性コアと前記強磁性コアに巻き付けられ第1高周波電源に結合された第1コイルとを備え、
前記コイル部は、前記第1高周波電源より高周波電力を受けると、前記プラズマを閉じ込める電界及び磁界を生成することを特徴とする装置。 - 前記誘電性支持リングに配置され、前記上部電極が接地されるときに前記上部電極の有効接地面積を増加させるように構成された導電体リングを更に備えることを特徴とする請求項1に記載の装置。
- 前記導電体リングは非磁性の金属でできているか、
前記強磁性コアは半円形又はU形のロッドであり夫々の中央部の周りに前記第1コイルが巻き付けられているか、又は、
前記導電体リングは非磁性の金属でできており、かつ、前記強磁性コアは半円形又はU形のロッドであり夫々の中央部の周りに第1コイルが巻き付けられていることを特徴とする請求項2に記載の装置。 - 前記第1高周波電源の周波数は10KHz〜1MHzであるか、
少なくとも8つのコイル部が、その間に均一な間隔をおいて誘電性支持リングに搭載されているか、又は、
前記第1高周波電源の周波数は10KHz〜1MHzであり、かつ、少なくとも8つのコイル部が、その間に均一な間隔をおいて誘電性支持リングに搭載されていることを特徴とする請求項1に記載の装置。 - 前記第1コイルは同じ方向に巻き付けられ、前記電界は前記誘電性支持リングの円周方向に形成されることを特徴とする請求項1に記載の装置。
- 前記コイル部は夫々、前記強磁性コアに巻き付けられ前記第1高周波電源に結合された第2コイルを更に含み、前記第1コイルは前記強磁性コアの一端に位置し、前記第2コイルは前記強磁性コアの反対端に位置し、前記第1コイルと前記第2コイルの間には間隔があけられていることを特徴とする請求項1に記載の装置。
- 複数の前記第1コイルは直列に接続され、複数の前記第2コイルは直列に接続され、スイッチ構造により1つの第1高周波電源から前記複数の第1コイル又は前記複数の第2コイルに高周波電力が供給されることを特徴とする請求項6に記載の装置。
- 隣接したコイル部は、反対方向に巻き付けられていることを特徴とする請求項1に記載の装置。
- プラズマ処理装置であって、
第1高周波電源に結合された下部電極と、
前記下部電極の上に配置され、その上に載せられる基板をクランプする力を発生するように構成されたチャックと、
前記第1高周波電源に結合され、上記チャックの上に配置される上部電極と、
前記上部電極を囲む誘電性支持リングと、
前記誘電性支持リング上に搭載された複数のコイル部と、
を備え、
前記複数のコイル部は夫々、前記誘電性支持リングの半径方向に置かれた強磁性コアと前記強磁性コアに巻き付けられ第2高周波電源に結合された第1コイルとを含み、
前記下部電極と前記上部電極は、前記第1高周波電源によって前記下部電極及び前記上部電極の何れかへ高周波電力が供給されると、前記下部電極と上部電極の間にプラズマを形成するように構成され、
前記コイル部は、前記第2高周波電源より高周波電力を受けると、前記プラズマを閉じ込める電界と磁界を発生することを特徴とするプラズマ処理装置。 - 前記誘電性支持リングに配置され、前記上部電極が接地されるときに前記上部電極の有効接地面積を増加させるように構成された導電体リングを更に備えることを特徴とする請求項9に記載のプラズマ処理装置。
- 前記第2高周波電源の周波数は10KHz〜1MHzであるか、
少なくとも8つのコイル部が、その間に均一な間隔をおいて誘電性支持リングに搭載されているか、又は、
前記第2高周波電源の周波数は10KHz〜1MHzであり、かつ、少なくとも8つのコイル部が、その間に均一な間隔をおいて誘電性支持リングに搭載されていることを特徴とする請求項9に記載のプラズマ処理装置。 - 前記第1コイルは同じ方向に巻き付けられており、前記電界は前記誘電性支持リングの円周方向に形成されることを特徴とする請求項9に記載のプラズマ処理装置。
- 前記コイル部は夫々、前記強磁性コアに巻き付けられ前記第2高周波電源に結合された第2コイルを更に含み、前記第1コイルは前記強磁性コアの一端に位置し、前記第2コイルは前記強磁性コアの反対端に位置し、前記第1コイルと前記第2コイルの間には間隔があけられており、スイッチ構造を介して前記第1コイル又は前記第2コイルに高周波電力が供給されることを特徴とする請求項9に記載のプラズマ処理装置。
- 前記第1コイルは直列に接続され前記強磁性コアに同じ方向に巻き付けられており、前記第2コイルは直列に接続され前記第1コイルとは反対方向に巻き付けられていることを特徴とする請求項13に記載のプラズマ処理装置。
- 隣接したコイル部は、反対方向に巻き付けられていることを特徴とする請求項9に記載のプラズマ処理装置。
- 前記第1高周波電源は、単一の周波数を用いる単一の高周波電源又は異なる周波数を用いる多重高周波電源であることを特徴とする請求項9に記載のプラズマ処理装置。
- 前記第1高周波電源と、前記上部電極又は前記下部電極との間に入る1つ以上のマッチング回路を更に備えることを特徴とする請求項16に記載のプラズマ処理装置。
- 前記第1高周波電源と、前記上部電極又は前記下部電極との間に入る蓄電器を更に備えることを特徴とする請求項16に記載のプラズマ処理装置。
- 前記下部電極は前記第1高周波電源に結合され、前記上部電極は単一の高周波電源及び多重高周波電源より選択された第3高周波電源と結合されていることを特徴とする請求項13に記載のプラズマ処理装置。
- 前記第3高周波電源と前記上部電極との間に入る1つ以上のマッチング回路を更に備えることを特徴とする請求項19に記載のプラズマ処理装置。
- 前記第3高周波電源と前記上部電極との間に蓄電器を更に備えることを特徴とする請求項19に記載のプラズマ処理装置。
- 前記上部電極を前記第3高周波電源に接続、又は前記上部電極を接地させるためのスイッチを更に備えることを特徴とする請求項19に記載のプラズマ処理装置。
- 前記チャックは静電チャックであることを特徴とする請求項9に記載のプラズマ処理装置。
- 前記プラズマ処理装置に処理気体流を注入する気体注入システムを更に含むことを特徴とする請求項9に記載のプラズマ処理装置。
- 前記電界及び磁界を囲む複数の閉じ込めリングを更に備えることを特徴とする請求項9に記載のプラズマ処理装置。
- 請求項9に記載のプラズマ処理装置内で半導体基板を支持する工程と、
前記上部電極と前記下部電極との間の空間にプラズマを形成する工程と、
前記半導体基板を前記プラズマで処理する工程と、
を含むことを特徴とする半導体基板の処理方法。 - 前記半導体基板はウェハーであり、
前記処理工程は前記ウェハー上の材料の層をプラズマエッチングすることを含むことを特徴とする請求項26に記載の方法。
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PCT/US2007/015928 WO2008010943A2 (en) | 2006-07-18 | 2007-07-13 | Hybrid rf capacitively and inductively coupled plasma source using multifrequency rf powers and methods of use thereof |
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