Patent ID: 9040341
Filing Date: 2015-05-26
Classification: H01L

Abstract:
1. A method of forming an image sensor device, the method comprising: forming a patterned hard mask layer over a substrate, wherein the patterned hard mask layer has a plurality of first openings in a periphery region of the substrate, and a plurality of second openings in a pixel region of the substrate; forming a first patterned mask layer over the pixel region to expose the periphery region; etching a plurality of first trenches into the substrate in the periphery region; filling each first trench, each first opening and each second opening with a dielectric material; forming a second patterned mask layer over the periphery region to expose the pixel region; removing the dielectric material in each second opening over the pixel region; and implanting dopant through each second opening to form doped isolation features in the pixel region.