KR102255545B1 - 반도체 장치 및 반도체 장치의 제조 방법 - Google Patents
반도체 장치 및 반도체 장치의 제조 방법 Download PDFInfo
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Abstract
(해결 수단) N 채널형 MOS 트랜지스터를 정전기 보호 소자로 하는 반도체 장치에 있어서, N 채널형 MOS 트랜지스터는 N 형 고농도 드레인 영역으로부터 하방으로 향해 감소하는 3 종류의 상이한 불순물 농도를 갖는 종방향의 전계 완화 영역과, N 형 고농도 드레인 영역으로부터 채널 영역으로 향해 감소하는 3 종류의 상이한 불순물 농도를 갖는 횡방향의 전계 완화 영역과, 종방향의 전계 완화 영역과 횡방향의 전계 완화 영역에 접하는 가장 불순물 농도가 낮은 전계 완화 영역을 갖는 구조로 했다.
Description
도 2 는 본 발명의 실시예인 반도체 장치의 정전기 보호 소자의 특성도이다.
도 3 은 본 발명의 실시예인 반도체 장치의 정전기 보호 소자의 특성도이다.
도 4 는 본 발명의 실시예인 반도체 장치의 정전기 보호 소자의 특성도이다.
도 5 는 N 채널형 MOS 트랜지스터의 IDS-VDS 특성도이다.
101 : P 형 웰 영역
102 : N 형 웰 영역
103 : N 형 저농도 확산 영역 (제 2 N 형 웰 영역)
104 : 필드 산화막
105 : N 형 중농도 확산 영역
106 : 게이트 산화막
107 : 채널 영역
108 : 게이트 전극
109 : N 형 고농도 소스 영역
110 : N 형 고농도 드레인 영역
X1 : 채널 영역~N 형 저농도 확산 영역간 거리
X2 : N 형 저농도 확산 영역~N 형 웰 영역간 거리
X3 : N 형 저농도 확산 영역~N 형 고농도 드레인 영역간 거리
a, b, c, d, e, f : N 형 확산 영역 (전계 완화 영역)
Claims (7)
- 반도체 기판 상에 형성된 필드 산화막 및 게이트 산화막과,
상기 게이트 산화막 상에 형성되고, 일단이 상기 필드 산화막 상에 연장되어 배치된 게이트 전극과,
상기 게이트 전극의 타단에 형성된 N 형 고농도 소스 영역과,
상기 N 형 고농도 소스 영역과 상기 필드 산화막의 일방의 단부 사이에 끼워져 상기 게이트 산화막 아래에 형성된 채널 영역과,
상기 필드 산화막의 상기 일방의 단부의 반대측이 되는 타방의 단부에 형성된 N 형 고농도 드레인 영역과,
상기 필드 산화막의 하방으로서, 상기 N 형 고농도 드레인 영역의 주위에 형성된 복수의 전계 완화 영역으로 이루어지는 N 채널형 MOS 트랜지스터를 갖는 반도체 장치로서,
상기 복수의 전계 완화 영역은 상기 N 형 고농도 드레인 영역으로부터 하방으로 향해 감소하는 3 종류의 상이한 불순물 농도를 갖는 종방향의 전계 완화 영역과, 상기 N 형 고농도 드레인 영역으로부터 상기 채널 영역으로 향해 감소하는 3 종류의 상이한 불순물 농도를 갖는 횡방향의 전계 완화 영역과, 상기 종방향의 전계 완화 영역과 상기 횡방향의 전계 완화 영역에 접하는 가장 불순물 농도가 낮은 전계 완화 영역을 가지고 있고,
상기 종방향의 전계 완화 영역은, N 형 웰 영역으로 이루어지는 영역 a 와, 상기 N 형 웰 영역과 N 형 저농도 확산 영역이 중첩된 영역 b 와, 상기 N 형 웰 영역과 상기 N 형 저농도 확산 영역과 N 형 중농도 확산 영역이 중첩된 영역 c 를 포함하고,
상기 횡방향의 전계 완화 영역은, 상기 영역 c 와, P 형 웰 영역과 상기 N 형 저농도 확산 영역과 상기 N 형 중농도 확산 영역이 중첩된 영역 d 와, 상기 P 형 웰 영역과 상기 N 형 중농도 확산 영역이 중첩된 영역 e 를 포함하고,
상기 가장 불순물 농도가 낮은 전계 완화 영역은, 상기 P 형 웰 영역과 상기 N 형 저농도 확산 영역이 중첩된 영역 f 를 포함하는 것을 특징으로 하는 반도체 장치. - 제 1 항에 있어서,
상기 N 형 웰 영역의 반도체 기판내 깊이는 상기 N 형 저농도 확산 영역보다 깊고, 상기 N 형 저농도 확산 영역의 반도체 기판내 깊이는 상기 N 형 중농도 확산 영역보다 깊은 것을 특징으로 하는 반도체 장치. - 제 1 항에 있어서,
상기 N 형 저농도 확산 영역이 상기 필드 산화막 상에 연장된 상기 게이트 전극과 중첩되지 않는 것을 특징으로 하는 반도체 장치. - 제 1 항 내지 제 3 항 중 어느 한 항에 기재된 반도체 장치의 제조 방법으로서,
반도체 기판의 표면에 P 형 웰 영역 및 N 형 웰 영역을 형성하는 공정과,
N 형 저농도 확산 영역을 상기 N 형 웰 영역보다 얕게 형성하는 공정과,
필드 산화막의 형성 영역 아래에 N 형 불순물을 이온 주입하고, 산화 확산시켜 상기 필드 산화막과 N 형 중농도 확산 영역을 동시에 형성하는 공정과,
상기 필드 산화막이 없는 영역에 채널 영역을 형성하는 공정과,
상기 채널 영역의 표면에 게이트 산화막을 형성하는 공정과,
상기 게이트 산화막 상에 게이트 전극을 형성하는 공정과,
상기 게이트 전극 및 상기 필드 산화막을 마스크로 하여 고농도의 N 형 불순물을 이온 주입하여 N 형 고농도 소스 영역 및 N 형 고농도 드레인 영역을 형성하는 공정과,
층간 절연막 형성 공정과,
컨택트 비아 형성 공정과,
배선 공정과,
보호막 형성 공정으로 이루어지는 것을 특징으로 하는 반도체 장치의 제조 방법. - 제 4 항에 있어서,
상기 채널 영역과 상기 N 형 저농도 확산 영역 사이의 거리를 조정하는 공정과, 상기 N 형 저농도 확산 영역과 상기 N 형 고농도 드레인 영역 사이의 거리를 조정하는 공정을 추가로 갖는 것을 특징으로 하는 반도체 장치의 제조 방법. - 제 4 항에 있어서,
상기 N 형 저농도 확산 영역과 상기 N 형 웰 영역 사이의 거리를 조정하는 공정과, 상기 N 형 저농도 확산 영역과 상기 N 형 고농도 드레인 영역 사이의 거리를 조정하는 공정을 추가로 갖는 것을 특징으로 하는 반도체 장치의 제조 방법. - 삭제
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US11804561B2 (en) * | 2019-03-20 | 2023-10-31 | Sony Semiconductor Solutions Corporation | Light receiving element, method of manufacturing light receiving element, and imaging apparatus |
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US5369045A (en) * | 1993-07-01 | 1994-11-29 | Texas Instruments Incorporated | Method for forming a self-aligned lateral DMOS transistor |
US6198131B1 (en) * | 1998-12-07 | 2001-03-06 | United Microelectronics Corp. | High-voltage metal-oxide semiconductor |
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JP2007266473A (ja) | 2006-03-29 | 2007-10-11 | Mitsumi Electric Co Ltd | 半導体装置 |
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US8174070B2 (en) * | 2009-12-02 | 2012-05-08 | Alpha And Omega Semiconductor Incorporated | Dual channel trench LDMOS transistors and BCD process with deep trench isolation |
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