JP2020534668A - 複数の埋込電極を有する基板支持体 - Google Patents
複数の埋込電極を有する基板支持体 Download PDFInfo
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Abstract
Description
本明細書で説明する諸実施形態は、概して、半導体製造で用いられる処理チャンバに関し、具体的には、基板にバイアスをかけるように構成された基板支持アセンブリを有する処理チャンバ及び基板にバイアスをかける方法に関する。
高アスペクト比のフィーチャーを確実に作り出すことは、半導体デバイスの超大規模集積(VLSI)及び超超大規模集積(ULSI)という次世代に向けた重要な技術課題の1つである。高アスペクト比のフィーチャーを形成する、ある1つの方法では、プラズマ支援エッチング処理を用いて、基板の誘電体層などの材料層に高アスペクト比の開口部を形成している。典型的なプラズマ支援エッチング処理では、処理チャンバ内でプラズマを形成し、プラズマからのイオンを、基板とその上のマスクに形成された開口部とに向けて加速させて、マスク表面の下の材料層に開口部を形成する。通常は、400kHzから2MHzの範囲の低周波RF電力を基板に結合させることにより、イオンは基板に向かって加速され、これにより、そこにバイアス電圧が発生する。しかしながら、RF電力を基板に結合すると、基板にはプラズマに対する単一の電圧が印加されない。一般的に用いられる構成では、基板とプラズマの間の電位差は、ゼロに近い値から最大となる負の値までRF電力の周波数で振動する。プラズマから基板へイオンを加速させている電位が単一でないことにより、基板表面及びその材料層に形成される開口部(フィーチャー)では広範囲のイオンエネルギーがもたらされる。加えて、RFバイアスに起因するイオン軌跡の相違により、基板表面に対するイオンの角度分布は大きくなる。アスペクト比の高いフィーチャーの開口部をエッチングする場合、イオンエネルギーの範囲が広いことは望ましくない。それは、イオンが、望ましいエッチング速度を維持するのに十分な高エネルギーを有してフィーチャーの底部にまで到達しないからである。基板表面に対するイオンの角度分布が大きいことも望ましくない。それは、大きな角度分布は、フィーチャープロファイルの変形(その垂直側壁のくびれや曲がりなど)を引き起こすからである。
Claims (15)
- 基板支持体内の複数の第1電極であって、
複数の第1電極の各電極は、複数の第1電極のうちの他のすべての電極から電気的に絶縁され、それらの電極と同一平面上にあり、
複数の第1電極の各電極は、パルスDC電力を、基板の領域に対してそれとの容量結合によって供給するように構成されている第1電極と、
基板支持体内に配置され、複数の第1電極から電気的に絶縁された第2電極であって、基板を基板支持体に電気的にクランプする第2電極とを備える基板支持アセンブリ。 - 複数の第1電極の各電極の少なくとも一部が、第2電極と同一平面上にある、請求項1に記載の基板支持アセンブリ。
- 複数の第1電極の1つ以上の電極の少なくとも一部は、第2電極よりも基板支持体の基板支持面の近くにある、請求項1に記載の基板支持アセンブリ。
- 第2電極は単一の伝導体を含み、この単一の伝導体は複数の第1電極から、その中に形成された複数の開口部によって電気的に絶縁されている、請求項1に記載の基板支持アセンブリ。
- 複数の第1スイッチであって、複数の第1スイッチの各スイッチは、複数の第1電極のうちの1つの電極に電気的に接続されている第1スイッチと、
複数の第2スイッチであって、複数の第2スイッチの各スイッチは、複数の第1電極のうちの1つの電極に電気的に接続されている第2スイッチとを備えるスイッチングシステムをさらに備える、請求項1に記載の基板支持アセンブリ。 - 複数の第1スイッチの各スイッチは、最大約100kHzまでの周波数で切り替わるように構成されたソリッドステートスイッチである、請求項5に記載の基板支持アセンブリ。
- 処理容積を画定する1つ以上の側壁及び底部と、
基板支持体であって、
基板支持体内の複数の第1電極であって、
複数の第1電極の各電極は、複数の第1電極のうちの他のすべての電極から電気的に絶縁され、それらの電極と同一平面上にあり、
複数の第1電極の各電極は、パルスDCバイアスを、基板の領域に対してそれとの容量結合によって供給するように構成されている第1電極と、
基板支持体内に配置され、複数の第1電極から電気的に絶縁された第2電極であって、基板を基板支持体に電気的にクランプする第2電極とを備える基板支持体とを備える処理チャンバ。 - 複数の第1スイッチであって、
複数の第1スイッチの各スイッチは、第1周期的DC電圧を供給するように構成され、
複数の第1スイッチの各スイッチは、複数の第1電極のうちの1つの電極に電気的に接続されている第1スイッチと、
複数の第2スイッチであって、
複数の第2スイッチの各スイッチは、第2周期的DC電圧を供給するように構成され、
複数の第2スイッチの各スイッチは、複数の第1電極のうちの1つの電極に電気的に接続されている第2スイッチとを備えるスイッチングシステムをさらに備える、請求項7に記載の処理チャンバ。 - 複数の第1電極の各電極の少なくとも一部が第2電極と同一平面上にある、請求項7に記載の処理チャンバ。
- 複数の第1電極のうちの1つ以上の電極の少なくとも一部が、第2電極よりも基板支持体の基板支持面の近くにある、請求項7に記載の処理チャンバ。
- 第2電極は単一の伝導性材料部分を含み、この単一の伝導性材料部分は、単一の伝導性材料部分に形成された複数の開口部によって複数の第1電極から電気的に絶縁されている、請求項7に記載の処理チャンバ。
- 処理ガスを処理チャンバに流入させる工程と、
処理ガスからプラズマを形成する工程と、
処理チャンバに配置された基板支持体に、基板支持体に配置されたチャック電極を用いて基板を電気的にクランプする工程であって、基板支持体は、第1誘電体層及び第2誘電体層を含んでいる工程と、
基板支持体内に配置された複数のバイアス電極に複数の周期的DC電圧を供給する工程であって、それぞれの周期的DC電圧は、個々のパルスDCバイアスを、基板の領域に対してそれとの容量結合によって供給している工程とを含む、基板を処理する方法。 - 複数の周期的DC電圧は2つ以上の極性を含んでいる、請求項12に記載の方法。
- 複数の周期的DC電圧は、約10Hzから約100kHzの間の2つ以上の周波数を含んでいる、請求項12に記載の方法。
- チャック電極は単一の伝導性材料部分を含み、この単一の伝導性材料部分は複数のバイアス電極から、その中に形成された複数の開口部によって電気的に絶縁されている、請求項12に記載の方法。
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US15/710,753 US10510575B2 (en) | 2017-09-20 | 2017-09-20 | Substrate support with multiple embedded electrodes |
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PCT/US2018/042956 WO2019060028A1 (en) | 2017-09-20 | 2018-07-19 | SUBSTRATE SUPPORT WITH MULTIPLE INTEGRATED ELECTRODES |
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JP2023182644A (ja) | 2023-12-26 |
KR20200031184A (ko) | 2020-03-23 |
CN115799030A (zh) | 2023-03-14 |
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JP7357664B2 (ja) | 2023-10-06 |
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