发明授权
- 专利标题: Fabrication of image sensor with improved signal to noise ratio
- 专利标题(中): 具有提高信噪比的图像传感器制造
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申请号: US12454818申请日: 2009-05-22
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公开(公告)号: US07998782B2公开(公告)日: 2011-08-16
- 发明人: Jin-Ho Kim , Chang-Rok Moon , Seung-Hun Shin
- 申请人: Jin-Ho Kim , Chang-Rok Moon , Seung-Hun Shin
- 申请人地址: KR Suwon-si
- 专利权人: Samsung Electronics Co., Ltd.
- 当前专利权人: Samsung Electronics Co., Ltd.
- 当前专利权人地址: KR Suwon-si
- 代理商 Monica H. Choi
- 优先权: KR10-2008-0058047 20080619
- 主分类号: H01L21/8238
- IPC分类号: H01L21/8238
摘要:
For fabricating an image sensor, an isolation structure is formed to define a first active region of a semiconductor substrate. A first transistor and a second transistor of a unit pixel are formed in the first active region. In addition, a threshold voltage lowering region is formed in a portion of the semiconductor substrate near a portion of the isolation structure abutting the second transistor in the first active region. The threshold voltage lowering region causes the second transistor to have a respective threshold voltage magnitude that is lower than for the first transistor. The threshold voltage lowering region is formed simultaneously with a passivation region in a second active region having a photodiode formed therein.
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