Patent ID: 8629523
Filing Date: 2014-01-14
Classification: H01L

Abstract:
1. An image sensor device using backside illumination with an inserted reflective shield to increase quantum efficiency, comprising: a photodiode disposed near a front surface of a substrate; and a reflective shield disposed above the photodiode, wherein the reflective shield is embedded within a dielectric layer, the reflective shield comprising at least two elements spaced apart from one another, wherein the dielectric layer is in direct contact with the photodiode, the photodiode is adapted to receive light from a back surface of the substrate, the back surface and the reflective shield are on opposite sides of the photodiode, and the reflective shield is adapted to reflect a photon coming from the back surface of the substrate that passes through the photodiode to re-enter the photodiode, wherein a first surface of the reflective shield is concave and a second surface opposite the first surface is substantially flat across an entirety of the second surface.