JP2004289185A - 多層拡張ドレイン構造を有する高電圧縦型トランジスタ - Google Patents
多層拡張ドレイン構造を有する高電圧縦型トランジスタ Download PDFInfo
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- JCALBVZBIRXHMQ-UHFFFAOYSA-N [[hydroxy-(phosphonoamino)phosphoryl]amino]phosphonic acid Chemical compound OP(O)(=O)NP(O)(=O)NP(O)(O)=O JCALBVZBIRXHMQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】 低いオン抵抗特性を有し、オフ状態において高電圧を維持する高電圧トランジスタは、多層拡張ドレイン構造の近傍に一又は二以上のソース領域が配置されており、この構造は、一又は二以上の誘電体層によってフィールドプレート部材から分離された拡張されたドリフト領域を含んでいる。フィールドプレート部材は最も低い回路ポテンシャルにおいて、トランジスタはオフ状態においてドレインに印加される高電圧を維持する。層状の構造は、種々の方法で製造することができる。MOSFET構造は、ソース領域近傍のデバイスに組み込まれるか、あるいはMOSFET構造を省略して、スタンドアロンのドリフト領域を有する高電圧トランジスタ構造を製造することができる。
【選択図】 図1
Description
第一の導電型のドレイン領域を含み、
第一の導電型の少なくとも一つのソース領域を含み、
前記第一の導電型とは反対の第二の導電型のボディ領域を含み、そのうちの少なくとも一つはソース領域と隣接しており、
ドレイン領域から少なくとも一つのボディ領域へ向かう第一の方向において、平行に配置された第一の導電型からなる複数のドリフト領域を含み、これらのドリフト領域は前記第一の方向と直交する第二の方向において誘電体層により分離されており、
誘電体層内に配置された少なくとも一つのフィールドプレート部材を含み、この少なくとも一つのフィールドプレート部材はドリフト領域から完全に分離されており、そして、
少なくとも一つのフィールドプレート部材と少なくとも一つのボディ領域の間に配置された絶縁ゲートを含み、チャネル領域が前記少なくとも一つのボディ領域内において絶縁ゲートの近くにおいて前記少なくとも一つのソース領域と少なくとも一つのドリフト領域の間に規定されている、
ことを特徴とする。
ドレイン領域に電気的に接続されたドレイン電極と、
を含むものである。
第一の導電型のドレイン領域を有し、
第一の導電型とは反対の第2の導電型の複数のボディ領域を有し、
第一の導電型の複数のドリフト領域を有し、各ドリフト領域はドレイン領域から一又は二以上のボディ領域に向かう第一の方向に延在しており、
第一の方向に延在する第一のフィールドプレート部材を含み、各フィールドプレート部材は第二の方向において離間し、誘電体層によってドリフト領域とは絶縁されており、
第一の導電型の複数のソース領域を含み、各ソース領域はボディ領域の一つに近接しており、
各ボディ領域の上に配置された少なくとも一つの絶縁ゲート部材を含み、これによりソース領域の一つからドリフト領域の一つへ向かう第二の方向に延在するチャネル領域を規定する、
ことを特徴とする。
前記ドレイン領域と電気的に接続したドレイン電極と、
前記ソース領域と電気的に接続したソース電極と、
を含むことを特徴とする。
基板を含み、
第一の導電型のソース領域を含み、
縦方向に延在してソース領域を基板と接続する第二の導電型のドリフト領域を含み、ドリフト領域は第一及び第二の側壁を有し、
第一及び第二の側壁にそれぞれ沿って配置された第一及び第二の誘電体層を含み、
それぞれ第一及び第二の誘電体層の近くで縦方向に延在する第一及び第二のフィールドプレート部材を含み、第一及び第二の誘電体層はそれぞれ第一及び第二の側壁から第一及び第二のフィールドプレート部材を絶縁し、第一及び第二のフィールドプレート部材は基板から絶縁され、第一及び第二の側壁と平行な方向とされており、
ソース領域と電気的に接続されたソース電極及び基板と電気的に接続されたドレイン電極を含み、
縦型高電圧トランジスタがオン状態で動作するときは、電流がソース電極からソース領域、ドリフト領域そして基板を通ってドレイン電極へ流れ、縦型高電圧トランジスタがオフ状態で動作するときは、ドリフト領域がピンチオフとされる、
ことを特徴とする。
Claims (30)
- 第一の導電型のドレイン領域と、
第一の導電型とは反対の第二の導電型の複数のボディ領域と、
第一の導電型の複数のドリフト領域であって、それぞれがドレイン領域から一または二以上のボディ領域へ向かう第一の方向に延び、
前記第一の方向へ延びる複数のフィールドプレート部材であって、それぞれが第二の方向において分離されており、かつ、誘電体層によってドリフト領域から絶縁されているフィールドプレート部材と、
第一の導電型の複数のソース領域であって、それぞれがボディ領域の一つと隣接したソース領域と、
各ボディ領域の上に配置され、これによりソース領域の一つからドリフト領域の一つへ向かう第二の方向に延びるチャネル領域を規定する、少なくとも一つの絶縁ゲート部材と、
を含むことを特徴とする縦型高電圧トランジスタ。 - さらに、前記ドレイン領域と電気的に接続したドレイン電極、および前記ソース領域に電気的に接続したソース電極を含んでいる請求項1に記載の縦型高電圧トランジスタ。
- 前記ドリフト領域は、その長さ方向が前記第一の方向であり、幅方向が前記第二の方向であり、長さは幅の5倍よりも長いものである、請求項1に記載の縦型高電圧トランジスタ。
- 前記ドレイン領域は、実質的に平坦な底面を有する基板を含み、前記第一の方向は基板の底面に直交する方向であり、前記第二の方向は、基板の底面に平行な方向である、請求項1に記載の高電圧トランジスタ。
- 前記誘電体層は、二酸化ケイ素からなる請求項1に記載の縦型高電圧トランジスタ。
- 前記ドリフト領域は、前記ドレイン領域近傍でより高く、前記ボディ領域の近傍でより低いドーピングを有する、請求項1に記載の縦型高電圧トランジスタ。
- 前記ドリフト領域は、線型的に変化するドーピングプロファイルを有している請求項1に記載の縦型高電圧トランジスタ。
- 第一の導電型のドレイン領域と、
第一の導電型のソース領域と、
前記第一の導電型とは反対の第二の導電型であって、前記ソース領域に隣接するボディ領域と、
前記ドレイン領域からボディ領域へ向かう第一の方向に延びるよう平行に配列された前記第一の導電型の複数のドリフト領域であって、前記ドレイン領域とボディ領域が前記第一の方向において少なくとも15ミクロンの距離だけ隔てられ、前記ドリフト領域の隣接するもの同士が前記第一の方向と直交する第二の方向において誘電体層によって分離されているドリフト領域と、
前記誘電体層内に配置された高濃度の導電材料からなるフィールドプレート部材と、
前記ボディ領域に隣接して配置された絶縁ゲートと、
を含むことを特徴とする高電圧トランジスタ。 - 前記第一の導電型はn型であり、前記第二の導電型はp型である、請求項8に記載の高電圧トランジスタ。
- 前記フィールドプレート部材は、高い濃度にドープされたポリシリコンからなる、請求項8に記載の高電圧トランジスタ。
- 各ドリフト領域は、線形的に変化するドーピングプロファイルを有している、請求項8に記載の高電圧トランジスタ。
- 第一の導電型のドレイン領域と、
第一の導電型のソース領域と、
前記第一の導電型とは反対の第二の導電型であって、前記ソース領域に隣接するボディ領域と、
前記ドレイン領域からボディ領域へ向かう第一の方向に延びるよう平行に配列された前記第一の導電型の複数のドリフト領域であって、前記ドリフト領域の隣接するもの同士が前記第一の方向と直交する第二の方向において誘電体層によって分離されているドリフト領域と、
前記誘電体層内に配置されたフィールドプレート部材であって、その上部が、前記ボディ領域の最下端部よりも上に延びているフィールドプレート部材と、
前記ボディ領域に隣接して配置された絶縁ゲートと、
を含むことを特徴とする高電圧トランジスタ。 - さらに、前記ソース領域に電気的に接続したソース電極、および前記ドレイン領域と電気的に接続したドレイン電極を含んでいる請求項12に記載の高電圧トランジスタ。
- 平坦な底面を有する半導体基板上に作製され、前記第一の方向は前記平坦な底面に実質的に直交し、前記第二の方向は前記平坦な底面と実質的に平行である、請求項12に記載の高電圧トランジスタ。
- 前記第一の導電型はn型であり、前記第二の導電型はp型である、請求項12に記載の高電圧トランジスタ。
- 少なくとも一つの前記フィールドプレート部材は、高い濃度にドープされたポリシリコンからなる、請求項12に記載の高電圧トランジスタ。
- 前記ドリフト領域は、前記ドレイン領域近傍でより高く、前記ボディ領域の近傍でより低いドーピングを有する、請求項12に記載の高電圧トランジスタ。
- 第一の導電型のドレイン領域と、
第一の導電型のソース領域と、
前記第一の導電型とは反対の第二の導電型であって、前記ソース領域に隣接するボディ領域と、
前記ドレイン領域からボディ領域へ向かう第一の方向に延びるよう平行に配列された前記第一の導電型の複数のドリフト領域であって、各ドリフト領域は前記第二の方向の幅と最大ドーピング濃度を有し、前記幅と前記最大ドーピング濃度の積が1×1013cm-2よりも小さく、かつ、前記ドリフト領域の隣接するもの同士が前記第一の方向と直交する第二の方向において誘電体層によって分離されているドリフト領域と、
前記誘電体層内に配置されたフィールドプレート部材と、
前記ボディ領域に隣接して配置された絶縁ゲートと、
を含むことを特徴とする高電圧トランジスタ。 - さらに、前記ソース領域に電気的に接続したソース電極、および前記ドレイン領域と電気的に接続したドレイン電極を含んでいる請求項18に記載の高電圧トランジスタ。
- 平坦な底面を有する半導体基板上に作製され、前記第一の方向は前記平坦な底面に実質的に直交し、前記第二の方向は前記平坦な底面と実質的に平行である、請求項18に記載の高電圧トランジスタ。
- 前記第一の導電型はn型であり、前記第二の導電型はp型である、請求項18に記載の高電圧トランジスタ。
- 前記ドリフト領域は、前記ドレイン領域近傍でより高く、前記ボディ領域の近傍でより低いドーピングを有する、請求項18に記載の高電圧トランジスタ。
- 前記各ドリフト領域は、線型的に変化するドーピングプロファイルを有している請求項18に記載の高電圧トランジスタ。
- 第一の導電型のドレイン領域と、
第一の導電型のソース領域と、
前記第一の導電型とは反対の第二の導電型であって、前記ソース領域に隣接するボディ領域と、
前記ドレイン領域からボディ領域へ向かう第一の方向に延びるよう平行に配列された前記第一の導電型の複数のドリフト領域であって、前記ドレイン領域とボディ領域が前記第一の方向において少なくとも15ミクロンの距離だけ隔てられ、前記ドリフト領域の隣接するもの同士が前記第一の方向と直交する第二の方向において誘電体層によって分離されているドリフト領域と、
前記誘電体層内に配置され、前記ドレイン領域から電気的に分離されているフィールドプレート部材と、
前記ボディ領域に隣接して配置された絶縁ゲートと、
を含むことを特徴とする高電圧トランジスタ。 - 前記第一の導電型はn型であり、前記第二の導電型はp型である、請求項24に記載の高電圧トランジスタ。
- 前記フィールドプレート部材は金属又は合金からなる、請求項25に記載の高電圧トランジスタ。
- 第一の導電型のドレイン領域と、
第一の導電型のソース領域と、
前記第一の導電型とは反対の第二の導電型であって、前記ソース領域に隣接するボディ領域と、
前記ドレイン領域からボディ領域へ向かう第一の方向に延びるよう平行に配列された前記第一の導電型の複数のドリフト領域であって、前記ドレイン領域とボディ領域が前記第一の方向において少なくとも15ミクロンの距離だけ隔てられ、前記ドリフト領域の隣接するもの同士が前記第一の方向と直交する第二の方向において誘電体層によって分離されているドリフト領域と、
前記誘電体層内に配置され、かつ、隣接するドリフト領域から前記第二の方向において少なくとも2ミクロンの距離だけ離間しているフィールドプレート部材と、
前記ボディ領域に隣接して配置された絶縁ゲートと、
を含むことを特徴とする高電圧トランジスタ。 - 前記第一の導電型はn型であり、前記第二の導電型はp型である、請求項27に記載の高電圧トランジスタ。
- 前記フィールドプレート部材は金属又は合金からなる、請求項27に記載の高電圧トランジスタ。
- 前記フィールドプレート部材は、高い濃度にドープされたポリシリコンからなる、請求項27に記載の高電圧トランジスタ。
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- 2002-08-16 EP EP04078400A patent/EP1528600B1/en not_active Expired - Lifetime
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- 2002-08-16 AT AT04078400T patent/ATE551725T1/de active
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Also Published As
Publication number | Publication date |
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EP1528600A2 (en) | 2005-05-04 |
US6573558B2 (en) | 2003-06-03 |
US7648879B2 (en) | 2010-01-19 |
JP5403747B2 (ja) | 2014-01-29 |
US20030197220A1 (en) | 2003-10-23 |
EP2264778A2 (en) | 2010-12-22 |
US7791132B2 (en) | 2010-09-07 |
US6781198B2 (en) | 2004-08-24 |
JP4436598B2 (ja) | 2010-03-24 |
US7829944B2 (en) | 2010-11-09 |
EP1291926A3 (en) | 2004-02-04 |
US6882005B2 (en) | 2005-04-19 |
JP2010034579A (ja) | 2010-02-12 |
US20090061585A1 (en) | 2009-03-05 |
EP1528600A3 (en) | 2008-08-06 |
US20030047768A1 (en) | 2003-03-13 |
JP4564793B2 (ja) | 2010-10-20 |
JP2003179229A (ja) | 2003-06-27 |
EP1291926A2 (en) | 2003-03-12 |
EP2264778A3 (en) | 2011-02-02 |
ATE551725T1 (de) | 2012-04-15 |
US20050023571A1 (en) | 2005-02-03 |
EP1528600B1 (en) | 2012-03-28 |
US20030047769A1 (en) | 2003-03-13 |
US20030047793A1 (en) | 2003-03-13 |
US6787847B2 (en) | 2004-09-07 |
US20100109077A1 (en) | 2010-05-06 |
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