Patent ID: 8318529
Filing Date: 2012-11-27
Classification: H01L

Abstract:
1. A method of fabricating an image sensor including a pixel circuitry region and a peripheral circuitry region, the method comprising: fabricating front side components on or in a front side of the image sensor; implanting a dopant layer on a backside of the image sensor; forming an anti-reflection layer on the backside that covers a first portion of the dopant layer under the pixel circuitry region while exposing a second portion of the dopant layer under the peripheral circuitry region; and laser annealing the first portion of the dopant layer from the backside of the image sensor through the anti-reflection layer, wherein the anti-reflection layer increases penetration of an annealing laser into the first portion of the dopant layer while reducing a first heat dissipation rate out the backside of the image sensor from the first portion of the dopant layer during the laser annealing relative to a second heat dissipation rate out the backside of the image sensor from the second portion of the dopant layer during the laser annealing.