Patent ID: 6627475
Filing Date: 2003-09-30
Classification: H01L

Abstract:
A method of forming an image sensor comprising:providing a partially processed semiconductor wafer containing a p-type region; forming an n-type photodiode region within said p-type region, where said n-type photodiode region is formed singly, separately, independently and before the formation of isolation, gate, and source/drain regions; forming a field oxide isolation region which extends beyond said p-type region and covers said p-type region except for an active region and an overlap part of said n-type photodiode region, which will overlap a source/drain region of an n-channel MOSFET; forming an n-channel MOSFET in said active region, said n-channel MOSFET containing a gate electrode, a gate oxide layer and source/drain regions, with one of the source/drain regions of said MOSFET extending over said overlap part of said n-type photodiode region; depositing a blanket transparent insulating layer.