KR100760142B1 - 고해상도 cmos 이미지 센서를 위한 스택형 픽셀 - Google Patents
고해상도 cmos 이미지 센서를 위한 스택형 픽셀 Download PDFInfo
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Abstract
Description
이와 같이 본 발명은 핀드 포토다이오드 아래에 특수 전위 장벽을 배치함으로써, 깊은 벌크로부터 광-발생된 캐리어들을 전환하고, 이들이 용이하게 수집될 수 있고, 판독을 위해 저장될 수 있는 실리콘의 표면에 대한 협소 영역으로 이들을 흐르도록 하는 것이 가능하다. 따라서, 벌크로부터의 캐리어들은 실리콘 표면 근처의 포토다이오드에 인접한 저장영역(즉, 플로팅확산)에 편리하게 축적될 수 있다. 따라서, 미국특허 제6,894,265호에 개시된 기술처럼 매립된 포토다이오드들을 형성하고 실리콘 벌크에서 깊게 전하들을 수집 및 축적하는 것이 필요하지는 않은데, 이는 액세스, 판독 및 리셋하기에 어려움을 주는 문제점이 해결되는 것이다.
또한, 특수 전위 장벽을 상이한 픽셀에서의 상이한 깊이로 배치시키고, 그에 따라 픽셀들을 상이한 광 스펙트럼 영역에 대해 민감하게 하는 것이 가능하다. 따라서, 각 픽셀은 하나 대신에 둘 또는 그 이상의 상이하게 코딩된 칼라 신호들을 제공할 수 있다. 해상도는 종래 방법에서 만큼 희생되지 않고, 광 감도도 희생되지 않는데, 그 이유는 칼라 흡수 필터들이 사용되지 않거나 종래보다 덜 사용되기 때문이다. 모든 광-발생 전하를 실리콘 표면에 근접하여 축적하면, 임의의 저 노이즈 판독 및 거기에 위치된 리셋 회로를 공유하는 것이 가능하게 되고, 그에 따라 매우 작은 픽셀 크기로 고 성능을 달성하게 된다. 따라서, 본 발명은 고 수율을 갖는 현재 CMOS 기술에 구현하기에 매우 단순하고 용이하다.
한편, 본 발명에 따른 픽셀에 있어서, p+ 도핑영역으로된 전위장벽(223)은 픽셀 내의 깊이(Xb)(225)에 배치되어 있다. 전위장벽(223)은 픽셀 내의 포토사이트를 2개의 별개의 영역으로 분리한다. 깊이(Xb)(통상적으로 공핍됨) 내부에서 발생된 광-발생 전하(208)는 핀드 포토다이오드의 n형 도핑영역(205)에서 수집 및 축적된다. 실리콘의 비공핍 영역의 전위장벽(223) 아래에서 발생된 전하(210)는 전위장벽(223) 주위를 통해 공핍 영역(209)의 에지로 확산되고 FD 영역(206)에서 수집 및 축적된다.
칼라 필터의 완전한 제거는 포토다이오드 표면 위의 구조의 높이를 최소로 감소시키고, 그에 따라 최대 광 감도를 가지면서 넓은 광 입사 각도에 대해 최대 픽셀 성능을 달성한다.
Claims (14)
- 픽셀 어레이를 포함하는 이미지센서에 있어서,상기 픽셀 어레이의 적어도 어느한 픽셀은,반도체기판 표면 하부의 제1영역에 형성되어 광-발생된 전하(photo-generated carriers)를 포집하는 광감지/전하저장영역;상기 광감지/전하저장영역과 분리되어 상기 반도체기판의 표면에 근접한 영역에 형성된 분리된 전하저장영역; 및상기 반도체기판 내부의 상기 제1영역 하부의 제2영역에서 광-발생된 전하를 상기 전하저장영역으로 전환(diverting)하기 위하여 상기 제1영역과 제2영역 사이의 상기 반도체기판 내부에 형성된 전위장벽을 포함하는 이미지센서.
- 제1항에 있어서,상기 분리된 전하저장영역은 플로팅확산인 것을 특징으로 하는 이미지센서.
- 제1항에 있어서,상기 분리된 전하저장영역은 상기 반도체기판 표면에서 게이트전극 아래에 생성된 전위 웰인 것을 특징으로 하는 이미지센서.
- 제3항에 있어서,상기 광감지/전하저장영역과 상기 전위 웰은 하나의 전하검출노드를 공유하는 것을 특징으로 하는 이미지센서.
- 제1항 내지 제4항중 어느한 항에 있어서,상기 픽셀 어레이는 체커보드 방식으로 배열되며 마젠타 필터를 갖는 픽셀들과 시안 필터를 갖는 픽셀들로 구성되는 것을 특징으로 하는 이미지센서.
- 제1항 내지 제4항중 어느한 항에 있어서,상기 픽셀 어레이는 체커보드 방식으로 배열되며 시안 필터를 갖는 픽셀들과 칼라필터가 없는 픽셀들로 구성되는 것을 특징으로 하는 이미지센서.
- 제1항 내지 제4항중 어느한 항에 있어서,상기 픽셀 어레이는 칼라필터 없이 상기 반도체 기판의 표면으로부터 서로 상이한 깊이에 상기 전위장벽이 형성된 픽셀들이 체커보드 방식으로 배열되어 구성되는 것을 특징으로 하는 이미지센서.
- 제6항에 있어서,상기 시안 필터를 갖는 픽셀과 칼라필터가 없는 픽셀은 서로 다른 변환이득 팩터를 갖는 것을 특징으로 하는 이미지센서.
- 제7항에 있어서,상기 서로 상이한 깊이에 상기 전위장벽이 형성된 픽셀들은 서로 다른 변환이득 팩터를 갖는 것을 특징으로 하는 이미지센서.
- 제1항 내지 제4항 중 어느 한 항에 있어서,상기 광감지/전하저장영역은 핀드 포토다이오드인 것을 특징으로 하는 이미지센서.
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KR1020050068469A KR100760142B1 (ko) | 2005-07-27 | 2005-07-27 | 고해상도 cmos 이미지 센서를 위한 스택형 픽셀 |
US11/418,212 US7737475B2 (en) | 2005-07-27 | 2006-05-05 | Stacked pixel for high resolution CMOS image sensor |
TW095117065A TWI306286B (en) | 2005-07-27 | 2006-05-15 | Stacked pixel for high resolution cmos image sensor |
JP2006157213A JP5252783B2 (ja) | 2005-07-27 | 2006-06-06 | 高解像度cmosイメージセンサのためのスタック型ピクセル |
CN2010101979497A CN101866939B (zh) | 2005-07-27 | 2006-06-27 | 用于高分辨率cmos图像传感器的堆叠式像素 |
CN2006100905485A CN1905202B (zh) | 2005-07-27 | 2006-06-27 | 用于高分辨率cmos图像传感器的堆叠式像素 |
US12/782,637 US8686479B2 (en) | 2005-07-27 | 2010-05-18 | Stacked pixel for high resolution CMOS image sensor |
JP2013033449A JP2013153174A (ja) | 2005-07-27 | 2013-02-22 | 高解像度cmosイメージセンサのためのスタック型ピクセル |
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