Patent ID: 9620555
Date: 2017-04-11
CPC Classifications: H01L

Claim:
1. A method comprising: forming a first photo-sensitive device and a second photo-sensitive device at a front surface of a semiconductor substrate; forming a dielectric layer over a back surface of the semiconductor substrate; depositing an adhesion layer over the dielectric layer, wherein the adhesion layer comprises a compound of nitrogen and a metal, and wherein substantially all grains in the adhesion layer are smaller than about 50 Å; forming a metal shielding layer over and contacting the adhesion layer, wherein the adhesion layer and the metal shielding layer are on a backside of the semiconductor substrate; and patterning the adhesion layer and the metal shielding layer to remove a first portion of the adhesion layer and a first portion of the metal shielding layer, wherein a second portion of the adhesion layer and a second portion of the metal shielding layer remain over the dielectric layer after patterning the adhesion layer and the metal shielding layer.