JP4955539B2 - シャワーヘッド電極及びヒータを備えるプラズマ処理用の装置 - Google Patents
シャワーヘッド電極及びヒータを備えるプラズマ処理用の装置 Download PDFInfo
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Description
ヒータ700には、どんなタイプの能動ヒータも含まれ得る。ヒータ700は少なくとも1つの抵抗加熱素子を有する金属板を備えることが好ましく、抵抗加熱素子は、板を加熱して、上部シャワーヘッド電極200を均一に加熱する。いかなるヒータ構成を使用し得るが、熱伝導板と組み合わせた抵抗加熱素子が好ましく、板は、アルミニウム、アルミニウム合金、又は同様のもの等の金属材料で作られることが好ましく、金属材料は上部シャワーヘッド電極200と親和性がある形状に機械加工されることが好ましい。例えば、ヒータ700は、鋳造アルミニウム合金の板の中に、少なくとも1つの抵抗加熱素子を備えることができる。
天板800は、ヒータ700と協働して、上部シャワーヘッド電極200の温度を制御することが好ましく、天板800を使用して、ヒータ700を貫通する熱的な経路を介して、ヒータ700及び/又は上部シャワーヘッド電極200を冷却してもよい。天板800は、どんな熱伝導性材料を使用してもよいが、アルミニウム又はアルミニウム合金から作られることが好ましい。シャワーヘッドアセンブリは、設置されたとき、室の内部の天板800の下側を覆うことが好ましい。
装置100は、上部シャワーヘッド電極200の温度を監視するために、熱電対又は光ファイバ装置等、1つ以上の温度センサ950を含み得る。好ましい一実施形態では、温度センサ950は、温度制御装置900によって監視され、温度制御装置900は、電力供給装置250からヒータ700への電力を制御し、かつ/又は、監視温度の機能として、流体制御装置850から天板800を介した流体の流れを制御する。したがって、上部シャワーヘッド電極200を所定の温度若しくは温度範囲で又はその周辺で、加熱し、冷却し、又は維持するために、温度センサ950によって温度制御装置900に提供されるデータにより、電力供給装置250又は流体制御装置850は、温度制御装置900によってアクティブにされ、連続的又は間欠的な態様で、電力又は冷却流体を、それぞれヒータ700及び/又は天板800に供給することができるようになる。能動的な加熱及び/又は冷却の結果として、上部シャワーヘッド電極200の温度は、現在の下限温度又は閾値温度を下回ること、若しくは、現在の上限温度を超えて増大することが防止され、又は、予め定められた温度又はその周辺に保持され得る。
前述の通り、装置100は、上部シャワーヘッド電極200と流体連通し、上部シャワーヘッド電極200の上に配置されるガス分配部材500を含み得る。好ましくは、ガス分配部材500と組み合わせて上部シャワーヘッド電極200を使用することにより、プロセスガスは、処理中の基板上にある1つ以上のガス分配区画に送り届けられる。さらに、バフルにガスの流れを制御させる必要もなく、ガス分配部材500を使用して、ガスを上部シャワーヘッド電極200の裏面に分配することができる。例えば、本願の譲受人に譲渡された米国特許第6,508,913号を参照されたい。そこには、混合ガスを室の中の各区画に送り届けるための複数のガス供給装置及びガス供給ラインを備える、半導体基板を処理するためのガス分配システムが開示されており、ここに参考として、その全体を本明細書に援用する。
装置には、絶縁体600も含まれ得る。絶縁体600は、熱伝導性であるが電気的に絶縁性であることが好ましく、窒化アルミニウム又は窒化ホウ素等のセラミックであることがより好ましい。この絶縁体600は、上部シャワーヘッド電極200に加えられるRF電力を、他の電力源、及び、ヒータ700用等の他の電力源に関連する他の導電部分から絶縁する助けとして有用である。したがって、ヒータのAC又はDC電力と上部シャワーヘッド電極200のRF電力との間の電気的な干渉が低減された状態で、上部シャワーヘッド電極200を加熱することができるように、絶縁体600により、ヒータ700を電気的に絶縁するが上部シャワーヘッド電極200と熱的に接触して配置することができる。
装置100の各構成部品を構造的に支持するために、機械的な留め具を使用して、構成部品を互いに対して所定の位置に保持する。金属ボルトを機械的な留め具として使用することが好ましく、ボルトを使用して、装置100内で構成部品の各々を取り付ける。2つの別々のサブアセンブリを使用して、装置100のアセンブリを簡略化すること、及び、装置100内の構成部品の保守及び置換えをうまく進めることが好ましい。
Claims (21)
- 真空室の内部に搭載され、シャワーヘッド電極と半導体基板が支持される下部電極との間のプラズマが生成されるギャップにプロセスガスを供給するように適合された前記シャワーヘッド電極と、
軸方向に延びるハブと横方向に延びる金属板とを含み、前記シャワーヘッド電極に取り付けられたガス分配部材と、
前記ハブを囲む電気絶縁性材料の板を含み、前記ガス分配部材に取り付けられた熱経路部材と、
前記ハブを囲む熱伝導性材料の板を含み、前記熱経路部材に取り付けられたヒータと、
を備え、
前記ヒータは、前記ガス分配部材及び前記熱経路部材を備える熱経路を介して、前記シャワーヘッド電極に熱を伝達することを特徴とするシャワーヘッド電極アセンブリ。 - 前記熱経路部材は熱伝導性かつ電気絶縁性材料の環状板を備えることを特徴とする請求項1に記載のシャワーヘッド電極アセンブリ。
- 前記熱経路部材は窒化物材料を備えることを特徴とする請求項1に記載のシャワーヘッド電極アセンブリ。
- 前記熱経路部材は、窒化アルミニウム又は窒化ホウ素を備えることを特徴とする請求項1に記載のシャワーヘッド電極アセンブリ。
- 請求項1に記載のシャワーヘッド電極アセンブリを備える真空室であって、前記ガス分配部材の前記ハブは、前記真空室の温度制御された上端壁内の開口部に延び、前記ガス分配部材の前記横方向に延びる金属板は、前記シャワーヘッド電極を完全に覆って延びることを特徴とする真空室。
- 前記真空室の前記温度制御された上端壁は、前記ヒータ、前記熱経路部材、前記ガス分配部材及び前記シャワーヘッド電極を貫通する熱経路を介して、前記シャワーヘッド電極から熱を取り出すことを特徴とする請求項5に記載の真空室。
- 前記シャワーヘッド電極は、RF電力が加えられた電極であり、前記ガス分配部材は、前記ガス分配部材の前記ハブから前記ガス分配部材の前記横方向に延びる金属板及び次いで前記シャワーヘッド電極にRF電力を分配する導電性材料であることを特徴とする請求項5に記載の真空室。
- 前記ガス分配部材の前記横方向に延びる金属板は、前記シャワーヘッド電極の裏面上の断面積の0.1から99.9%に接触する突起を含み、前記突起は、前記ガス分配部材と前記シャワーヘッド電極の前記裏面との間にプレナムを形成することを特徴とする請求項7に記載の真空室。
- 前記シャワーヘッド電極を囲む環状の接地電極をさらに備え、前記ギャップ及び電気絶縁体に面する露出面を備える前記接地電極は、前記接地電極の内周部と前記シャワーヘッド電極の外周部との間に配置されることを特徴とする請求項1に記載のシャワーヘッド電極アセンブリ。
- 請求項1に記載のシャワーヘッド電極アセンブリを含むプラズマエッチング室内のプラズマエッチングを制御する方法であって、
前記プラズマエッチング室内の前記ヒータに電力を加える工程と、
前記ヒータから前記シャワーヘッド電極に熱を導くことによって、前記プラズマエッチング室内の前記シャワーヘッド電極の少なくとも一部分を所定の温度に加熱する工程と、
前記シャワーヘッド電極を介して前記プラズマエッチング室にプロセスガスを供給し、前記プロセスガスを前記シャワーヘッド電極と半導体基板が支持される前記下部電極との間のギャップに流入させる工程と、
RF電力を前記シャワーヘッド電極に加え、前記プロセスガスをプラズマ状態に励起することにより、前記プラズマエッチング室内で半導体基板をエッチングする工程と、
を含み、
前記ヒータに加えられる前記電力及び前記シャワーヘッド電極に加えられる前記電力は、前記熱経路部材によって互いに電気的に分離されている方法。 - 前記シャワーヘッド電極を加熱する前記工程は、
(a)前記シャワーヘッド電極の少なくとも一部分を、少なくとも80℃の温度で加熱し維持すること、
(b)前記シャワーヘッド電極の少なくとも一部分を、少なくとも100℃の温度で加熱し維持すること、又は、
(c)前記シャワーヘッド電極の少なくとも一部分を、少なくとも150℃の温度で加熱し維持すること
を含むことを特徴とする請求項10に記載の方法。 - (a)前記シャワーヘッド電極を加熱する前記工程は、前記半導体基板の前記エッチングより前に存在する、
(b)前記エッチングは、前記半導体基板上の酸化物層内の開口部をエッチングすることを含み、前記開口部は、パターン化されたフォトレジストによって画定されている、
(c)前記プロセスガスは、フルオロカーボン及び/又はハイドロフルオロカーボンガスを含み、前記シャワーヘッド電極を加熱する前記工程は、前記プロセスガス中のフッ素ラディカル密度を制御することにより、前記フォトレジスト上の線条を低減させる、又は、
(d)前記エッチングは、酸化ケイ素層内に高いアスペクト比の接触開口部を形成する、
ことを特徴とする請求項10に記載の方法。 - 前記シャワーヘッド電極から、前記ガス分配部材、前記熱経路部材、前記ヒータ、1つ以上のサーマルチョーク及び前記プラズマエッチング室の上端壁に延びる熱経路に沿って熱を導くことにより、前記シャワーヘッド電極を冷却する工程をさらに含むことを特徴とする請求項10に記載の方法
- 前記シャワーヘッド電極に電力を加える前記工程は、前記プラズマエッチング室の外部の電力源から、前記ガス分配部材、及び、前記ガス分配部材と前記シャワーヘッド電極との間の複数の接触点を介して、前記ガス分配部材上に配置される電力入力口にRF電力を供給することを含むことを特徴とする請求項13に記載の方法。
- 前記ガスを供給する工程は、前記ガス分配部材から、前記シャワーヘッド電極の裏面における1つ以上のプレナムにガスを供給することを含むことを特徴とする請求項13に記載の方法。
- 前記ガスを供給する工程は、前記基板と前記シャワーヘッド電極の間の前記ギャップ内の中心領域に第1の混合ガスを供給することと、前記中心領域を囲む前記ギャップ内の環状領域に第2の混合ガスを供給することとを含み、前記第2の混合ガスは、前記第1の混合ガスとは異なるか、又は、前記第2の混合ガスは、前記1の混合ガスと同じであるが前記1の混合ガスとは異なる流量で供給されることを特徴とする請求項10に記載の方法。
- 前記プラズマエッチング室内で一群のウエハを1つずつエッチングする工程を含み、前記シャワーヘッド電極は、前記一群のウエハを処理する間、実質上均一な温度に維持されることを特徴とする請求項10に記載の方法。
- 前記ヒータの上面に配置されたサーマルチョークと、
前記シャワーヘッド電極の上方で、前記横方向に延びる金属板の下面に配置された接触点と、
前記シャワーヘッド電極の上面と前記横方向に延びる金属板との間に配置された裏当て部材と、
をさらに備え、
前記裏当て部材の下面は、前記シャワーヘッド電極の前記上面と、前記シャワーヘッド電極にプロセスガスを供給するために前記ガス分配部材中に設置される、半径方向に延びる流路、環状の分配管、出口およびガス供給口とに接触している、
ことを特徴とする請求項1に記載のシャワーヘッド電極アセンブリ。 - 前記ガス分配部材は、前記シャワーヘッド電極と前記横方向に延びる金属板との間の中央プレナムにプロセスガスを供給する第1のガス流路と、前記シャワーヘッド電極と前記横方向に延びる金属板との間の外方プレナムにプロセスガスを供給する第2のガス流路とを含む、ことを特徴とする請求項1に記載のシャワーヘッド電極アセンブリ。
- 前記ガス分配部材は、前記シャワーヘッド電極の前記裏面上の断面積の15%から30%に接触することを特徴とする請求項8に記載の真空室。
- コンタクトボルトが前記シャワーヘッド電極の部分を機械的に一体に結合する、ことを特徴とする請求項1に記載のシャワーヘッド電極アセンブリ。
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PCT/US2005/012221 WO2005111268A2 (en) | 2004-04-30 | 2005-04-11 | Apparatus including showerhead electrode and heater for plasma processing |
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CN1950545B (zh) | 2015-11-25 |
CN1950545A (zh) | 2007-04-18 |
KR20070015599A (ko) | 2007-02-05 |
US7712434B2 (en) | 2010-05-11 |
WO2005111268A3 (en) | 2006-03-23 |
WO2005111268A2 (en) | 2005-11-24 |
JP2007535817A (ja) | 2007-12-06 |
US20100151687A1 (en) | 2010-06-17 |
US20050241765A1 (en) | 2005-11-03 |
TW200541413A (en) | 2005-12-16 |
KR101166740B1 (ko) | 2012-07-27 |
TWI414211B (zh) | 2013-11-01 |
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