Patent ID: 8987113
Filing Date: 2015-03-24
Classification: H01L

Abstract:
1. A device comprising: an image sensing element embedded within a substrate; a first and second inter-metal dielectric (IMD) layers disposed over the image sensing element, wherein each of the first and second IMD layers includes a metal layer; a top IMD layer of substantially undoped silicon oxide disposed the first and second IMD layers, wherein the top inter-metal dielectric layer has a top surface and an opposing planar bottom surface, the bottom surface interfacing the second IMD layer above the image sensing element, and wherein the to surface includes a recess extending towards the image sensing element, and wherein a point on the recess of the top surface nearest the image sensing element is within the top inter-metal dielectric layer, spaced a distance from the bottom surface of the top IMD layer and lies directly above the first and second IMD layers; a first lens disposed over and physically contacting the top IMD layer, wherein the first lens includes a first portion disposed within the recess of the top IMD layer and a second portion that is not disposed within the recess of the top IMD layer, wherein the first lens exhibits a second refractive index that is greater than the first refractive index, wherein the first lens does not extend below the first plane; a color filter layer disposed over the first lens; and a second lens disposed over the color filter, wherein the second lens has a convex top surface facing away from the substrate, wherein the second lens exhibits a third refractive index that is greater than the first refractive index.