JP5363978B2 - 互いに接続されたシールド電極及びゲート電極を有するシールドゲートトレンチfetの構造及びこれを形成する方法 - Google Patents
互いに接続されたシールド電極及びゲート電極を有するシールドゲートトレンチfetの構造及びこれを形成する方法 Download PDFInfo
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Description
Claims (27)
- 電界効果トランジスタ(FET)であって、
半導体領域内に延在し、前記FETのアクティブ領域に設けられているトレンチと、
前記トレンチの下部に設けられ且つシールド誘電体により前記半導体領域から絶縁されるシールド電極と、
前記シールド電極上に設けられた電極間誘電体(IED)と、
前記トレンチの上部に設けられ、前記IED上に設けられ且つゲート誘電体により前記半導体領域から絶縁されているゲート電極と、を含み、
前記シールド電極、前記IED及び前記ゲート電極は前記トレンチから外に延在し、前記FETの非アクティブ領域に至り、
前記FETは、
前記シールド電極の表面が露出されるように前記IEDによって画定された第1部分と少なくとも一部が前記ゲート電極の側壁によって画定された第2部分とを有し、前記FETの前記非アクティブ領域に設けられた1つの接触開口部と、
前記接触開口部内に設けられ、前記シールド電極を前記ゲート電極と電気的に接続する相互接続層と、をさらに含むことを特徴とするFET。 - 前記半導体領域は、
第1の導電型のドリフト領域と、
前記ドリフト領域上に延在する第2の導電型のボディ領域と、
前記トレンチに隣接する前記ボディ領域に設けられた前記第1の導電型のソース領域と、を含んでいることを特徴とする請求項1に記載のFET。 - 前記相互接続層は第1の相互接続層であり、
前記ゲート電極は、前記トレンチにおいて前記半導体領域の上面より下に凹設され、
前記FETは、
前記ソース領域及び前記ボディ領域を接続する第2の相互接続層と、
前記ゲート電極上に設けられて、前記ゲート電極を前記第2の相互接続層から絶縁する誘電体材料と、をさらに含むことを特徴とする請求項2に記載のFET。 - 前記第1の導電型の基板をさらに含み、前記ドリフト領域は前記基板上に延在し、前記トレンチは前記ボディ領域を通って延在して前記ドリフト領域内で終端することを特徴とする請求項2に記載のFET。
- 前記第1の導電型の基板をさらに含み、前記ドリフト領域は前記基板上に延在し、前記トレンチは前記ボディ領域及び前記ドリフト領域を通って延在して前記基板内で終端することを特徴とする請求項2に記載のFET。
- 前記接触開口部は前記非アクティブ領域のゲートランナ領域に所定の間隔で設けられた複数の接触開口部のうちの1つであることを特徴とする請求項1に記載のFET。
- 前記シールド電極は前記トレンチ内の前記IEDを介して電気的接続部により前記ゲート電極にさらに電気的に接続されることを特徴とする請求項1に記載のFET。
- 前記ゲート電極は、前記トレンチ内の前記IEDにおける少なくとも1つの開口部を通って前記シールド電極にさらに電気的に接続されることを特徴とする請求項1に記載のFET。
- 前記非アクティブ領域は前記FETを含む半導体ダイの周縁に沿って延在する終端領域を含み、前記接触開口部は前記終端領域に設けられていることを特徴とする請求項1に記載のFET。
- 半導体ダイにおける電界効果トランジスタ(FET)であって、
少なくとも1つのアクティブセルを含むアクティブ領域と、
非アクティブ領域と、
第1の導電型のドリフト領域と、
前記ドリフト領域上に設けられた第2の導電型のボディ領域と、
前記ボディ領域を通り前記ドリフト領域に延在するトレンチと、を含み、
前記トレンチは前記トレンチ内に設けられたシールド電極、電極間誘電体(IED)及びゲート電極を有し、前記シールド電極は前記IED上に設けられ、前記IEDは前記ゲート電極の下に配置されており、
前記FETは、
前記IEDによって画定された第1部分と少なくとも一部が前記ゲート電極の端部によって画定された第2部分とを有し、前記非アクティブ領域に設けられた1つの接触開口部と、
前記接触開口部内に設けられ、前記シールド電極を前記ゲート電極と電気的に接続するゲート相互接続層と、をさらに含むことを特徴とするFET。 - 前記トレンチに隣接する前記ボディ領域に設けられた前記第1の導電型のソース領域と、
前記ソース領域に隣接する前記ボディ領域に設けられた前記第2の導電型の高濃度ボディ領域と、をさらに含むことを特徴とする請求項10に記載のFET。 - 前記ゲート電極は、前記トレンチにおいて前記ソース領域の上面より下に凹設され、
前記FETは、前記ソース領域及び前記高濃度ボディ領域を電気的に接続する別の相互接続層と、
前記ゲート電極上に設けられて、前記ゲート電極を前記別の相互接続層から絶縁する誘電体材料と、をさらに含むことを特徴とする請求項11に記載のFET。 - 前記第1の導電型の基板をさらに含み、
前記ドリフト領域は前記基板上に延在し、前記トレンチは前記ドリフト領域内で終端することを特徴とする請求項10に記載のFET。 - 前記第1の導電型の基板をさらに含み、
前記ドリフト領域は前記基板上に延在し、前記トレンチは前記ドリフト領域を通り前記基板内で終端することを特徴とする請求項10に記載のFET。 - 前記シールド電極は前記IEDを介して電気的接続部により前記ゲート電極にさらに電気的に接続されることを特徴とする請求項10に記載のFET。
- 前記非アクティブ領域は前記半導体ダイの中間部分を経て延在するゲートランナ領域を有し、
前記接触開口部は前記ゲートランナ領域に設けられていることを特徴とする請求項10に記載のFET。 - 前記非アクティブ領域は前記半導体ダイの周縁に沿って延在する終端領域を有し、
前記接触開口部は前記終端領域に設けられていることを特徴とする請求項10に記載のFET。 - 電界効果トランジスタ(FET)であって、
半導体領域に延在する複数のトレンチを含み、前記トレンチの各々はゲート電極及びシールド電極と、前記ゲート電極と前記シールド電極との間に設けられた電極間誘電体(IED)とを有し、前記トレンチの各々の前記シールド電極、前記IED及び前記ゲート電極は前記FETの非アクティブ領域に延在し、前記トレンチの各々の前記シールド電極及び前記ゲート電極は前記FETの前記非アクティブ領域内の1つの接触開口部に設けられた相互接続層を介して互いに電気的に接続され、前記接触開口部は前記IEDによって画定された第1部分と前記ゲート電極の側壁によって画定された第2部分とを有することを特徴とするFET。 - 電界効果トランジスタ(FET)を形成する方法であって、前記方法は、
半導体領域にトレンチを形成するステップと、
前記トレンチの下方側壁及び底面を覆いかつ前記トレンチから外にメサ領域まで延在するシールド誘電体層を形成するステップと、
前記トレンチの下部において前記トレンチから外に前記メサ領域まで延在するシールド電極を形成するステップと、
上方トレンチ側壁に沿って且つ前記シールド電極上に前記トレンチから外に前記メサ領域まで延在する電極間誘電体(IED)を形成するステップと、
前記トレンチ内において前記IED上に前記トレンチから外に前記メサ領域まで延在するゲート電極を形成するステップと、
前記シールド電極の表面が露出されるように前記IEDによって画定された第1部分と少なくとも一部が前記ゲート電極の側壁によって画定された第2部分とを有する1つの接触開口部を前記メサ領域に形成するステップと、
前記ゲート電極及び前記シールド電極を電気的に接続する相互接続層を前記接触開口部内に形成するステップと、を含むことを特徴とする方法。 - 前記メサ領域は前記FETを含む半導体ダイの非アクティブ領域に配置されていることを特徴とする請求項19に記載の方法。
- 前記IEDを形成するステップはシリコンの酸化を行うステップを含むことを特徴とする請求項19に記載の方法。
- 前記半導体領域は第1の導電型の基板上に設けられた前記第1の導電型のエピタキシャル層を含み、前記方法は、
前記エピタキシャル層に第2の導電型のボディ領域を形成するステップと、
前記トレンチに隣接する前記第1の導電型のソース領域を前記ボディ領域に形成するステップと、
前記ボディ領域に、前記ソース領域に隣接する前記第2の導電型の高濃度ボディ領域を形成するステップと、をさらに含むことを特徴とする請求項19に記載の方法。 - 前記ゲート電極を形成するステップの前に、前記トレンチ内の前記IEDの所定の部分に1つ以上の開口部を形成するステップをさらに含み、それにより前記ゲート電極を形成するステップは前記ゲート電極が前記IEDの前記所定の部分の前記1つ以上の開口部を通って前記シールド電極と電気的に接続される結果となることを特徴とする請求項19に記載の方法。
- アクティブ領域及び非アクティブ領域を有する電界効果トランジスタ(FET)を半導体ダイに形成する方法であって、前記方法は、
前記半導体ダイの前記アクティブ領域に半導体領域に延在するトレンチを形成するステップと、
前記トレンチを充填し且つ前記半導体ダイの前記非アクティブ領域におけるメサ領域上に延在する第1のポリシリコン層を形成するステップと、
前記トレンチ内において前記第1のポリシリコン層を凹設するステップと、を含み、
前記トレンチ内において前記第1のポリシリコン層を凹設するステップにより、前記トレンチの底部にシールド電極が形成され、前記シールド電極は前記トレンチから前記メサ領域に連続しており、
前記方法はさらに、
シリコンの酸化により誘電体層を形成するステップを含み、
前記誘電体層は、(i)前記トレンチの露出した上方側壁、(ii)前記シールド電極の上方表面、及び(iii)前記メサ領域における前記第1のポリシリコン層の表面領域を覆い、
前記方法はさらに、
前記トレンチを充填し且つ前記メサ領域における前記誘電体層上に延在する第2のポリシリコン層を形成するステップと、
前記トレンチ内において前記第2のポリシリコン層を凹設し、前記トレンチの上部にゲート電極を形成するステップと、を含み、
前記ゲート電極は前記トレンチから前記メサ領域に連続しており、
前記方法はさらに、
前記第1のポリシリコン層の表面が露出されるように前記誘電体層によって画定された第1部分と少なくとも一部が前記ゲート電極の端部によって画定された第2部分とを有する1つの接触開口部を前記メサ領域に形成するステップと、
前記接触開口部を充填するゲート相互接続層を形成し、前記第1のポリシリコン層及び前記第2のポリシリコン層を電気的に接続するステップと、を含むことを特徴とする方法。 - 前記第1のポリシリコン層を形成するステップの前に、前記トレンチの側壁及び底部を覆い且つ前記メサ領域上に延在するシールド誘電体層を形成するステップと、
前記第1のポリシリコン層を前記トレンチ内に凹設するステップの後に、前記トレンチ内に前記シールド誘電体層を凹設して前記トレンチの上方側壁を露出させるステップと、をさらに含むことを特徴とする請求項24に記載の方法。 - 前記半導体領域は第1の導電型の基板上に設けられた前記第1の導電型のエピタキシャル層を含み、
前記方法は、
前記エピタキシャル層に第2の導電型のボディ領域を形成するステップと、
前記トレンチに隣接する前記第1の導電型のソース領域を前記ボディ領域に形成するステップと、
前記ボディ領域に、前記ソース領域に隣接する前記第2の導電型の高濃度ボディ領域を形成するステップと、をさらに含むことを特徴とする請求項24に記載の方法。 - 電界効果トランジスタ(FET)を形成する方法であって、
半導体領域に延在するトレンチを形成するステップと、
前記FETの非アクティブ領域に延在するシールド電極を前記トレンチの底部に形成するステップと、
前記トレンチ及び前記FETの前記非アクティブ領域内の前記シールド電極上に電極間誘電体(IED)を形成するステップと、
前記FETの前記非アクティブ領域に延在するゲート電極を前記シールド電極上の前記トレンチの上部に形成するステップと、
前記シールド電極の表面が露出されるように前記IEDによって画定された第1部分と少なくとも一部が前記ゲート電極の端部によって画定された第2部分とを有する1つの接触開口部を前記FETの前記非アクティブ領域に形成するステップと、
前記シールド電極及び前記ゲート電極を電気的に接続するゲート相互接続層を形成するステップと、を含むことを特徴とする方法。
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US11/471,279 US7319256B1 (en) | 2006-06-19 | 2006-06-19 | Shielded gate trench FET with the shield and gate electrodes being connected together |
US11/471,279 | 2006-06-19 | ||
PCT/US2007/069329 WO2007149666A2 (en) | 2006-06-19 | 2007-05-21 | Structure and method for forming a shielded gate trench fet with the shield and gate electrodes being connected together |
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2006
- 2006-06-19 US US11/471,279 patent/US7319256B1/en active Active
-
2007
- 2007-05-21 WO PCT/US2007/069329 patent/WO2007149666A2/en active Application Filing
- 2007-05-21 KR KR1020087030499A patent/KR101437701B1/ko active IP Right Grant
- 2007-05-21 CN CN2010102251608A patent/CN101908562B/zh not_active Expired - Fee Related
- 2007-05-21 DE DE112007001454T patent/DE112007001454T5/de not_active Withdrawn
- 2007-05-21 CN CN2007800230139A patent/CN101473443B/zh not_active Expired - Fee Related
- 2007-05-21 AT AT0928507A patent/AT505888A2/de not_active Application Discontinuation
- 2007-05-21 JP JP2009516615A patent/JP5363978B2/ja active Active
- 2007-05-21 MY MYPI20085046A patent/MY147032A/en unknown
- 2007-05-25 TW TW096118749A patent/TWI443824B/zh active
- 2007-11-12 US US11/938,583 patent/US7473603B2/en active Active
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CN101473443A (zh) | 2009-07-01 |
KR101437701B1 (ko) | 2014-09-03 |
TW200810113A (en) | 2008-02-16 |
MY147032A (en) | 2012-10-15 |
US20110204436A1 (en) | 2011-08-25 |
KR20090018638A (ko) | 2009-02-20 |
CN101908562B (zh) | 2012-08-29 |
AT505888A2 (de) | 2009-04-15 |
US20070290257A1 (en) | 2007-12-20 |
US20080064168A1 (en) | 2008-03-13 |
CN101908562A (zh) | 2010-12-08 |
US7473603B2 (en) | 2009-01-06 |
WO2007149666A3 (en) | 2008-07-24 |
CN101473443B (zh) | 2010-09-01 |
US20090057754A1 (en) | 2009-03-05 |
US7859047B2 (en) | 2010-12-28 |
JP2009542002A (ja) | 2009-11-26 |
US7319256B1 (en) | 2008-01-15 |
DE112007001454T5 (de) | 2009-04-30 |
WO2007149666A2 (en) | 2007-12-27 |
TWI443824B (zh) | 2014-07-01 |
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