KR101977957B1 - 전력 반도체 소자 및 그 제조방법 - Google Patents
전력 반도체 소자 및 그 제조방법 Download PDFInfo
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- KR101977957B1 KR101977957B1 KR1020170142732A KR20170142732A KR101977957B1 KR 101977957 B1 KR101977957 B1 KR 101977957B1 KR 1020170142732 A KR1020170142732 A KR 1020170142732A KR 20170142732 A KR20170142732 A KR 20170142732A KR 101977957 B1 KR101977957 B1 KR 101977957B1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 91
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 239000012535 impurity Substances 0.000 claims abstract description 78
- 230000004913 activation Effects 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims description 54
- 238000005224 laser annealing Methods 0.000 claims description 24
- 238000000137 annealing Methods 0.000 claims description 21
- 230000003213 activating effect Effects 0.000 claims description 13
- 239000002019 doping agent Substances 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 210000000746 body region Anatomy 0.000 description 4
- 238000005468 ion implantation Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 239000002178 crystalline material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Abstract
Description
도 2는 도 1의 A 영역에서 필드 스톱 영역의 두께에 따른 농도 프로파일과 효율과 강건성을 나타낸 표이다.
도 3은 일반적인 전력 반도체 소자에서 효율과 강건성의 관계를 나타낸 그래프이다.
도 4는 본 발명의 일 실시예에 따른 전력 반도체 소자에서 효율과 강건성을 도해하는 도면이다.
도 5는 본 발명의 일 실시예에 따른 예시적인 전력 반도체 소자에서 액티브 셀 영역의 단면을 도해하는 도면이다.
도 6 및 도 7은 본 발명의 일 실시예에 따른 전력 반도체 소자를 제조하는 과정 중의 일부를 도해하는 도면들이다.
도 8은 이온 주입 공정과 후속의 어닐링 공정에 따른 활성화에 따른 격자 변화를 도해하는 도면이다.
도 9는 본 발명의 실시예와 비교예에 따른 전력 반도체 소자에서 버퍼층 구성, 불순물 농도 프로파일, 효율성 및 강건성을 요약하여 정리한 표이다.
70 : 버퍼층으로서 필드 스톱 영역
70a : 제 1 도전형의 불순물의 활성화가 상대적으로 강한 영역
70b : 제 1 도전형의 불순물의 활성화가 상대적으로 약한 영역
71 : 콜렉터 영역
Claims (8)
- 액티브(active) 셀 영역의 일부를 구성하되, 제1 도전형의 불순물이 제1 농도로 도핑된 에피택셜층;
상기 에피택셜층 아래에 배치되되, 제1 도전형의 불순물이 제2 농도로 도핑되어 활성화된 필드 스톱 영역; 및
상기 필드 스톱 영역 아래에 배치되되, 제2 도전형의 불순물이 도핑된 콜렉터 영역;
을 포함하되,
상기 필드 스톱 영역은 두께가 상대적으로 두꺼운 영역과 두께가 상대적으로 얇은 영역이 교호적으로 반복 배치되며, 도핑된 상기 제1 도전형의 불순물의 활성화가 상대적으로 강한 영역과 약한 영역이 교호적으로 반복 배치되되, 상기 두께가 상대적으로 두꺼운 영역은 상기 활성화가 상대적으로 강한 영역에 해당하며, 상기 두께가 상대적으로 얇은 영역은 상기 활성화가 상대적으로 약한 영역에 해당하는것을특징으로하는,
전력 반도체 소자.
- 제 1 항에 있어서,
상기 전력 반도체 소자가 스위칭 온(switching on) 시, 상기 필드 스톱 영역 중 활성화가 상대적으로 약한 영역을 통과하는 홀 전류가 상기 필드 스톱 영역 중 활성화가 상대적으로 강한 영역을 통과하는 홀 전류 보다 더 크며, 상기 전력 반도체 소자가 스위칭 오프(switching off) 시, 상기 필드 스톱 영역 중 활성화가 상대적으로 강한 영역을 통과하는 전자 전류가 상기 필드 스톱 영역 중 활성화가 상대적으로 약한 영역을 통과하는 전자 전류 보다 더 큰 것을 특징으로 하는,
전력 반도체 소자.
- 제 1 항에 있어서,
상기 필드 스톱 영역에서 제 1 도전형의 불순물이 도핑된 제 2 농도는 상기 에피택셜층에서 제 1 도전형의 불순물이 도핑된 제 1 농도 보다 상대적으로 더 높은 것을 특징으로 하는,
전력 반도체 소자.
- 제 1 항에 있어서,
상기 제 1 도전형 및 상기 제 2 도전형은 서로 반대의 도전형을 가지되 p형 및 n형 중 각각 어느 하나인,
전력 반도체 소자.
- 액티브(active) 셀 영역의 일부를 구성하되, 반도체 웨이퍼 상에 제1 도전형의 불순물이 제1 농도로 도핑된 에피택셜층을 형성하는 단계;
상기 에피택셜층 상에 게이트 구조체를 형성하는 단계;
상기 반도체 웨이퍼 중 테두리를 제외한 부분을 제거하는 단계;
상기 에피택셜층의 하부에 제1 도전형의 불순물을 제2 농도로 도핑한 후 제1 레이저 어닐링 공정으로 어닐링하여 활성화시켜 필드 스톱 영역을 형성하는 단계; 및
상기 에피택셜층의 하부 중에서 상기 필드 스톱 영역의 아래에 제2 도전형의 불순물을 도핑한 후 제2 레이저 어닐링 공정으로 어닐링하여 활성화시켜 콜렉터 영역을 형성하는 단계;
를 포함하되,
상기 필드 스톱 영역은 두께가 상대적으로 두꺼운 영역과 두께가 상대적으로 얇은 영역이 교호적으로 반복 배치되되, 제2 농도로 도핑된 상기 제1 도전형의 불순물의 활성화가 상대적으로 강한 영역과 약한 영역이 교호적으로 반복 배치되며,
상기 제1 레이저 어닐링 공정은 상기 두께가 상대적으로 두꺼운 영역은 상기 활성화가 상대적으로 강한 영역에 해당하며, 상기 두께가 상대적으로 얇은 영역은 상기 활성화가 상대적으로 약한 영역에 해당되도록 수행되는것을 특징으로하는,
전력 반도체 소자의 제조방법.
- 액티브(active) 셀 영역의 일부를 구성하되, 반도체 웨이퍼 상에 제1 도전형의 불순물이 제1 농도로 도핑된 에피택셜층을 형성하는 단계;
상기 에피택셜층 상에 게이트 구조체를 형성하는 단계;
상기 반도체 웨이퍼 중 테두리를 제외한 부분을 제거하는 단계;
상기 에피택셜층의 하부에 제2 도전형의 불순물을 도핑한 후 제2 레이저 어닐링 공정으로 어닐링하여 활성화시켜 콜렉터 영역을 형성하는 단계; 및
상기 에피택셜층의 하부 중에서 상기 콜렉터 영역 상에 제1 도전형의 불순물을 제2 농도로 도핑한 후 제1 레이저 어닐링 공정으로 어닐링하여 활성화시켜 필드 스톱 영역을 형성하는 단계;
를 포함하되,
상기 필드 스톱 영역은 두께가 상대적으로 두꺼운 영역과 두께가 상대적으로 얇은 영역이 교호적으로 반복 배치되되, 제2 농도로 도핑된 상기 제1 도전형의 불순물의 활성화가 상대적으로 강한 영역과 약한 영역이 교호적으로 반복 배치되며,
상기 제1 레이저 어닐링 공정은 상기 두께가 상대적으로 두꺼운 영역은 상기 활성화가 상대적으로 강한 영역에 해당하며, 상기 두께가 상대적으로 얇은 영역은 상기 활성화가 상대적으로 약한 영역에 해당되도록 수행되는것을 특징으로 하는,
전력 반도체 소자의 제조방법.
- 제 5 항 또는 제 6 항에 있어서,
상기 필드 스톱 영역은 도핑된 상기 제 1 도전형의 불순물의 활성화가 상대적으로 강한 영역과 약한 영역이 교호적으로 반복 배치되어 구성되도록 상기 제 1 레이저 어닐링 공정은 레이저 에너지 및 어닐링 시간 중의 적어도 어느 하나가 상기 활성화가 상대적으로 강한 영역과 약한 영역에 차등적으로 적용되도록 수행되는 것을 특징으로 하는,
전력 반도체 소자의 제조방법.
- 제 5 항 또는 제 6 항에 있어서,
상기 반도체 웨이퍼 중 테두리를 제외한 부분을 제거하는 단계는 타이코 프로세스 그라인딩 공정을 이용하여 제거하는 단계를 포함하는,
전력 반도체 소자의 제조방법.
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