Patent ID: 6329218
Filing Date: 2001-12-11
Classification: H01L

Abstract:
A method for fabricating an image sensor, said method comprising:providing a substrate;in-situ forming a first well and a second well of a first conductivity type in said substrate, wherein said first well is in a sensor photocell array region, and said second well is for a first metal oxide semiconductor adjacent to said sensor photocell array;forming a third well of a second conductivity type in said substrate, wherein said third well is for a second metal oxide semiconductor adjacent to said first metal oxide semiconductor and opposite to said sensor photocell array region;in-situ forming a first isolation device on said first well, a second isolation device between said sensor photocell array region and said first metal oxide semiconductor, and a third isolation device between said first metal oxide semiconductor and said second metal oxide semiconductor;subsequently completely forming said first metal oxide semiconductor structure and said second metal oxide semiconductor structure;ion-implanting of said second conductivity type into said sensor photocell array region to form a forth well in said sensor photocell array region; andion-implanting of said second conductivity type into said sensor photocell array region to form a fifth well in said sensor photocell array region, wherein said fifth well is on the surface of said substrate and in said forth well, and the concentration of said fifth well is heavier than said forth well.