Patent ID: 8354292
Filing Date: 2013-01-15
Classification: H01L

Abstract:
1. A method of manufacturing a CMOS image sensor, the method comprising: forming a P type epitaxial layer having a low concentration on an N type substrate that has an active pixel sensor array region and a peripheral circuit region; forming a deep P well having a high concentration in the P type epitaxial layer; forming a deep N well having a high concentration in a portion of the P type epitaxial layer in the active pixel sensor array region and through the deep P well to make contact with an operational voltage terminal; forming an isolation layer that has a first portion in the active pixel sensor array region and a second portion in the peripheral circuit region, the first portion having a thickness different from a thickness of the second portion; and a photodiode formed in the active pixel sensor array region isolated by the first portion of the isolation layer.