JP2005528796A - トレンチ・ゲート半導体装置と製造方法 - Google Patents
トレンチ・ゲート半導体装置と製造方法 Download PDFInfo
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Abstract
Description
エッチングにより前記半導体本体内に第一の溝を設け、
前記第一の溝の横壁近傍に複数のスペーサを形成し、該複数スペーサ間に開口が確定され、
前記複数スペーサ間の開口を介してエッチングにより前記半導体本体内に第二の溝を設け、該第二の溝は前記第一の溝の底部から前記ドレイン・コンタクト領域へ向かって延在し、そして、前記第二の溝は前記第一の溝より狭く、
前記第二の溝の底部と横壁を酸化させてフィールド・プレート絶縁層を形成する工程を備えたことを特徴とする方法を提供する。
前記第一及び第二の溝に電極材料を充填し、そして、前記フィールド・プレート絶縁層が露出するまで前記電極材料をエッチバックして前記第二の溝内の前記フィールド・プレート絶縁層上部に前記フィールド・プレートを設け、
前記複数スペーサを除去し、
前記フィールド・プレート上部と、そして、前記第一の溝の前記底部上と前記横壁上にゲート絶縁層を形成し、
前記ゲート絶縁層上部に前記ゲートを設ける工程を含む。
前記複数スペーサを除去し、
前記第一の溝の前記底部と前記横壁との上部にゲート絶縁層を形成し、
前記第一及び第二の溝に電極材料を充填して前記ゲートと前記フィールド・プレートとを形成する工程を含む。
Claims (10)
- 絶縁ゲートを内部に有するトレンチの第一の部分と、該第一のトレンチ部分の底部から延在する前記トレンチの第二の部分とを確定する半導体本体を含むトレンチ・ゲート半導体装置の製造方法であって、前記半導体本体は、前記第一のトレンチ部分近傍のチャネル形成領域により分離された第一の導電型のソース領域とドレイン領域とを備え、該ドレイン領域はドレイン・ドリフト領域とドレイン・コンタクト領域とを備え,前記ドレイン・ドリフト領域は前記チャネル形成領域と前記ドレイン・コンタクト領域との間にあり、前記ドレイン・ドリフト領域は前記ドレイン・コンタクト領域より軽度にドーピングされ、前記ゲートと前記ドレイン・コンタクト領域との間の前記トレンチの前記第二の部分内に設けられたフィールド・プレートとを備え、前記方法は、
エッチングにより前記半導体本体内に第一の溝を設け、
前記第一の溝の横壁近傍に複数のスペーサを形成し、該複数スペーサ間に開口が確定され、
前記複数スペーサ間の開口を介してエッチングにより前記半導体本体内に第二の溝を設け、該第二の溝は前記第一の溝の底部から前記ドレイン・コンタクト領域へ向かって延在し、そして、前記第二の溝は前記第一の溝より狭く、
前記第二の溝の底部と横壁を酸化させてフィールド・プレート絶縁層を形成する工程を備えたことを特徴とする方法。 - 前記第一及び第二の溝に電極材料を充填し、そして、前記フィールド・プレート絶縁層が露出するまで前記電極材料をエッチバックして前記第二の溝内の前記フィールド・プレート絶縁層上部に前記フィールド・プレートを設け、
前記複数スペーサを除去し、
前記フィールド・プレート上部と、そして、前記第一の溝の前記底部上と前記横壁上にゲート絶縁層を形成し、
前記ゲート絶縁層上部に前記ゲートを設ける工程を含むことを特徴とする請求項1に記載の方法。 - 前記複数スペーサを除去し、
前記第一の溝の前記底部と前記横壁との上部にゲート絶縁層を形成し、
前記第一及び第二の溝に電極材料を充填して前記ゲートと前記フィールド・プレートとを形成する工程を含むことを特徴とする請求項1に記載の方法。 - 前記第一のトレンチ部分の幅が前記第二のトレンチ部分の幅より大きいことを特徴とする請求項1乃至3いずれかに記載の方法により製造されたトレンチ・ゲート半導体装置。
- 前記フィールド・プレートが前記ソース領域に接続されていることを特徴とする請求項2に記載の方法により製造されたトレンチ・ゲート半導体装置。
- 前記フィールド・プレートがゲート電位より高く、そして、前記ドレイン・ドリフト領域のバルク破壊電圧に近いバイアス電位に接続されていることを特徴とする請求項2に記載の方法により製造されたトレンチ・ゲート半導体装置。
- 請求項6の装置を備えたモジュールであって、前記フィールド・プレートが前記モジュールの内部電圧線に接続されていることを特徴とするモジュール。
- 前記フィールド・プレートに電気的に接続された付加的外部端子が設けられていることを特徴とする請求項6の装置又は請求項7のモジュール。
- 前記バイアス電位は前記ドレイン・ドリフト領域の前記バルク破壊電圧の約60から100%であることを特徴とする請求項6又は請求項7の装置、又は,請求項7又は請求項8のモジュール。
- 前記バイアス電位は前記ドレイン・ドリフト領域の前記バルク破壊電圧の約80%であることを特徴とする請求項9の装置又はモジュール。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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GBGB0212564.9A GB0212564D0 (en) | 2002-05-31 | 2002-05-31 | Trench-gate semiconductor device |
GBGB0303162.2A GB0303162D0 (en) | 2002-05-31 | 2003-02-12 | Trench-gate semiconductor devices and the manufacture thereof |
PCT/IB2003/002230 WO2003103036A1 (en) | 2002-05-31 | 2003-05-21 | Trench-gate semiconductor device and method of manufacturing |
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JP2005528796A true JP2005528796A (ja) | 2005-09-22 |
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US (1) | US7232726B2 (ja) |
EP (1) | EP1514300A1 (ja) |
JP (1) | JP2005528796A (ja) |
CN (1) | CN100437942C (ja) |
AU (1) | AU2003232995A1 (ja) |
WO (1) | WO2003103036A1 (ja) |
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EP1514300A1 (en) | 2005-03-16 |
CN1656610A (zh) | 2005-08-17 |
US20050208722A1 (en) | 2005-09-22 |
CN100437942C (zh) | 2008-11-26 |
US7232726B2 (en) | 2007-06-19 |
WO2003103036A1 (en) | 2003-12-11 |
AU2003232995A1 (en) | 2003-12-19 |
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