Patent ID: 8962375
Filing Date: 2015-02-24
Classification: H01L

Abstract:
1. A method of creating a reflective shield for an image sensor device, comprising: depositing a first dielectric layer on a substrate, wherein a photodiode is on the substrate, and the first dielectric layer is in contact with the photodiode; removing surface topography of the substrate by performing chemical mechanical polishing (CMP) on the first dielectric layer; patterning the substrate to define an area on a surface of the first dielectric layer after CMP for the reflective shield, wherein the area defined for the reflective shield is directly above the photodiode; depositing a layer of a material with high reflectivity on the substrate after patterning the substrate, wherein the material with high reflectivity fills the area on the surface of the first dielectric layer; removing excess material with high reflectivity after the layer of the material with high reflectivity is deposited, wherein the reflective shield is formed and is embedded in the first dielectric layer; and depositing a second dielectric material on the substrate, wherein the second dielectric material covers the reflective shield.