Patent ID: 9129876
Filing Date: 2015-09-08
Classification: H01L

Abstract:
1. An image sensor, comprising: a microlens for receiving light; a substrate comprising a light sensing element in a light sensing area for receiving the light incident to the microlens; a first dielectric layer and a second dielectric layer stacked on the substrate from bottom to top, wherein the first dielectric layer contains a bottom layer of metal interconnect structures directly on contact plugs and the second dielectric layer has a recess directly on the first dielectric layer and in an optical path between the microlens and the light sensing element; a color filter disposed in the recess, wherein the whole color filter is disposed on the bottom layer of the metal interconnect structures and the color filter trims with the bottom layer; and a patterned etch stop layer located between the first dielectric layer having a flat top surface and the second dielectric layer and covering the bottom layer of the metal interconnect structures, wherein sidewalls of the patterned etch stop layer contact the color filter.