KR100957796B1 - 표면 브레이크다운 보호 기능을 갖는 저전압 펀치스루양방향 과도 전압 억압 디바이스 및 이를 제조하는 방법 - Google Patents
표면 브레이크다운 보호 기능을 갖는 저전압 펀치스루양방향 과도 전압 억압 디바이스 및 이를 제조하는 방법 Download PDFInfo
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Abstract
Description
Claims (18)
- 양방향 과도 전압 억압 디바이스로서,p 타입의 전도도를 갖는 하부 반도체 층과,p 타입의 전도도를 갖는 상부 반도체 층과,하부 및 상부 p-n 접합면이 형성되도록, 상기 하부 층과 상부 층에 인접하게 그 사이에 배치되는, n 타입의 전도도를 갖는 중간 반도체 층으로서, 상기 두 접합면 사이의 거리에 따라 취해진 상기 중간 반도체 층의 순(net) 도핑 농도의 총 합(integral)은, 브레이크다운(breakdown)이 일어날 때, 이 브레이크다운이 애벌란시 브레이크다운이 아니라 펀치스루 브레이크다운이 되도록 하고, 상기 순 도핑 농도의 총 합은 2 x 1012 내지 1 x 1013cm-2 범위에 있는, 중간 반도체 층과,상기 상부 층을 통해, 상기 중간 반도체 층을 통해, 그리고 상기 하부 층의 적어도 일부분을 통해, 이어져 있으며, 상기 디바이스에 대한 활성 영역을 한정하는, 메사 트렌치와,상기 상부 접합면과 하부 접합면에 해당하는 상기 메사 트렌치의 벽들의 적어도 일부분을 덮는 산화물 층으로서, 상기 상부 및 하부 접합면 사이의 거리가 상기 벽들에서 증가되는, 산화물 층을 포함하는,양방향 과도 전압 억압 디바이스.
- 제 1 항에 있어서, 상기 상부 층과 하부 층은 상기 중간 반도체 층보다도 더 높은 피크 순 도핑 농도를 가지는, 양방향 과도 전압 억압 디바이스.
- 제 1 항에 있어서, 상기 산화물 층은 열적으로 성장된 산화물 층인, 양방향 과도 전압 억압 디바이스.
- 제 3 항에 있어서, 상기 산화물 층은 습한 조건에서 열적으로 성장된, 양방향 과도 전압 억압 디바이스.
- 제 1 항에 있어서, 상기 반도체는 실리콘 반도체인, 양방향 과도 전압 억압 디바이스.
- 제 5 항에 있어서, 상기 p 타입의 전도도는 붕소 불순물에 의해 제공되며, 상기 n 타입의 전도도는 인 불순물에 의해 제공되는, 양방향 과도 전압 억압 디바이스.
- 제 1 항에 있어서, 상기 중간 반도체 층은 상기 두 접합면 사이의 중간점에서 최고가 되는 순 도핑 농도를 가지며, 그리고 상기 하부 층과 중간 반도체 층과 상부 층에 수직인 라인을 따른 도핑 윤곽(profile)은, 상기 중간 반도체 층의 중심면의 일측 위의 상기 도핑 농도 윤곽이, 상기 중간 반도체 층 내에 그리고 상기 하부 층과 상부 층의 적어도 일부분 내에서, 상기 중심면의 대향측 위의 상기 도핑 농도 윤곽에 대칭적(mirror)이 되도록 구성된, 양방향 과도 전압 억압 디바이스.
- 제 1 항에 있어서, 상기 기판은 p++ 기판이며, 상기 하부 층은 p+ 에피택시얼 층이며, 상기 중간 반도체 층은 n 에피택시얼 층이며, 상기 상부 층은 p+ 에피택시얼 층이며, 상기 하부 및 상부 p+ 에피택시얼 층의 각각의 피크 순 도핑 농도는 상기 n 에피택시얼 층의 피크 순 도핑 농도의 5 내지 20배 범위에 있는, 양방향 과도 전압 억압 디바이스.
- 삭제
- 양방향 과도 전압 억압 디바이스를 형성하는 방법으로서,p 타입의 반도체 기판을 제공하는 단계와,p 타입의 전도도를 갖는 하부 반도체 층을 에피택시얼 방식으로 증착하는 단계와,상기 하부 층 위에 n 타입의 전도도를 갖는 중간 반도체 층을 에피택시얼 방식으로 증착하는 단계로서, 상기 하부 층과 상기 중간 반도체 층은 하부 p-n 접합면을 형성하는, 중간 반도체 층 증착 단계와,상기 중간 반도체 층 위에 p 타입의 전도도를 갖는 상부 반도체 층을 에피택시얼 방식으로 증착하는 단계로서, 상기 중간 반도체 층과 상기 상부 층은 상부 p-n 접합면을 형성하는, 상부 반도체 층 증착 단계와,상기 기판과, 상기 하부 에피택시얼 층과, 상기 중간 에피택시얼 층과, 상기 상부 에피택시얼 층을 가열하는 단계와,상기 상부 층을 통해, 상기 중간 반도체 층을 통해, 그리고 상기 하부 층의 적어도 일부분을 통해 이어져 있으며, 상기 디바이스에 대한 활성 영역을 한정하는, 메사 트렌치를 에칭하는 단계와,상기 상부 접합면과 하부 접합면에 해당하는 상기 메사 트렌치의 벽들의 적어도 상기 일부분 위에 산화물 층을 열적으로 성장시키는 단계로서, 상기 상부 접합면과 하부 접합면 사이의 거리가 상기 벽들에서 증가되도록, 상기 산화물 층을 열적으로 성장시키는 단계를 포함하며,여기서 상기 상부 및 하부 접합면 사이의 거리에 따라 취해진 상기 중간 반도체 층의 순 도핑 농도의 총 합은, 브레이크다운이 일어날 때 이 브레이크다운이 애벌란시 브레이크다운이 아니라 펀치스루 브레이크다운이 되도록, 2 x 1012 내지 1 x 1013cm-2의 범위에 있는, 양방향 과도 전압 억압 디바이스를 형성하는 방법.
- 제 10 항에 있어서, 상기 상부 층과 하부 층은 상기 중간 반도체 층보다도 더 높은 피크 순 도핑 농도를 가지는, 양방향 과도 전압 억압 디바이스를 형성하는 방법.
- 제 10 항에 있어서, 상기 산화물 층을 형성하는 단계는 습식 열적 성장 단계인, 양방향 과도 전압 억압 디바이스를 형성하는 방법.
- 제 10 항에 있어서, 상기 디바이스는 상기 산화물 층을 형성한 후에 보상 확산 단계를 거치는, 양방향 과도 전압 억압 디바이스를 형성하는 방법.
- 제 10 항에 있어서, 상기 반도체는 실리콘 반도체인, 양방향 과도 전압 억압 디바이스를 형성하는 방법.
- 제 14 항에 있어서, 상기 p 타입의 전도도는 붕소 불순물에 의해 제공되며, 상기 n 타입의 전도도는 인 불순물에 의해 제공되는, 양방향 과도 전압 억압 디바이스를 형성하는 방법.
- 제 10 항에 있어서, 상기 중간 반도체 층은, 상기 두 접합면 사이의 중간점에서 최고가 되는 순 도핑 농도를 가지며, 그리고 상기 하부 층과 중간 반도체 층과 상부 층에 수직인 라인을 따른 도핑 윤곽은, 상기 중간 반도체 층의 중심면의 일측 위의 도핑 윤곽이 상기 중간 반도체 층 내에 그리고 상기 하부 층과 상부 층의 적어도 일부분 내에서 상기 중심면의 대향 측 위의 도핑 윤곽을 반영하도록 구성되는, 양방향 과도 전압 억압 디바이스를 형성하는 방법.
- 제 10 항에 있어서, 상기 기판은 p++ 기판이며, 상기 하부 층은 p+ 에피택시얼 층이며, 상기 중간 반도체 층은 n 에피택시얼 층이며, 상기 상부 층은 p+ 에피택시얼 층이며, 상기 하부 및 상부 p+ 에피택시얼 층의 각각의 피크 순 도핑 농도는 상기 n 에피택시얼 층의 피크 순 도핑 농도의 5 내지 20 배 범위에 있는, 양방향 과도 전압 억압 디바이스를 형성하는 방법.
- 삭제
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US09/903,107 | 2001-07-11 | ||
US09/903,107 US6600204B2 (en) | 2001-07-11 | 2001-07-11 | Low-voltage punch-through bi-directional transient-voltage suppression devices having surface breakdown protection and methods of making the same |
PCT/US2002/021953 WO2003015248A2 (en) | 2001-07-11 | 2002-07-11 | Low-voltage punch-through bi-directional transient-voltage suppression devices having surface breakdown protection and methods of making the same |
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KR20040017288A KR20040017288A (ko) | 2004-02-26 |
KR100957796B1 true KR100957796B1 (ko) | 2010-05-13 |
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US (2) | US6600204B2 (ko) |
EP (1) | EP1405347A4 (ko) |
JP (1) | JP4358622B2 (ko) |
KR (1) | KR100957796B1 (ko) |
CN (1) | CN100416836C (ko) |
AU (1) | AU2002355597A1 (ko) |
TW (1) | TWI257697B (ko) |
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JP4358622B2 (ja) | 2009-11-04 |
AU2002355597A1 (en) | 2003-02-24 |
US20030010995A1 (en) | 2003-01-16 |
CN1605127A (zh) | 2005-04-06 |
US6600204B2 (en) | 2003-07-29 |
US6858510B2 (en) | 2005-02-22 |
WO2003015248A3 (en) | 2003-05-30 |
KR20040017288A (ko) | 2004-02-26 |
JP2005502190A (ja) | 2005-01-20 |
WO2003015248A2 (en) | 2003-02-20 |
EP1405347A4 (en) | 2009-08-19 |
TWI257697B (en) | 2006-07-01 |
US20030205775A1 (en) | 2003-11-06 |
CN100416836C (zh) | 2008-09-03 |
EP1405347A2 (en) | 2004-04-07 |
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