Patent ID: 7446359

Claim:
An integrated circuit device, comprising: a semiconductor substrate; a sensor array region including a plurality of photoelectric conversion elements arranged in an array on the semiconductor substrate; a plurality of interlayer dielectric layers on the sensor array region; a plurality of light transmissive regions extending through the plurality of interlayer dielectric layers from respective ones of the plurality of photoelectric conversion elements, each of the light transmissive regions having a trench positioned therein, the trench extending through at least one of the plurality of interlayer dielectric layers; a plurality of light reflecting metal elements between ones of the plurality of interlayer dielectric layers positioned outside of and between ones of the light transmissive regions; and a photo absorption layer formed on on the plurality of metal elements and extending along sidewalls of the trenches that inhibits reflection of light associated with the photoelectric conversion element of one of the light transmissive regions to another of the light transmissive regions to limit crosstalk between the plurality of photoelectric conversion elements, the photo absorption layer extending along a portion of a bottom of each of the trenches to define apertures associated with the respective photoelectric conversion elements; wherein the plurality of interlayer dielectric layers comprises: a first interlayer dielectric layer on the sensor array region; and a second interlayer dielectric layer on the first interlayer dielectric layer; and wherein the plurality of light reflecting metal elements comprises: a first metal layer on the first intelayer dielectric layer and having portions extending between ones of the light transmissive regions; and a second metal layer on the second interlayer dielectric layer and having portions extending between ones of the light transmissive regions, wherein the photo absorption layer is on and in contact with the second metal layer and extends along sidewalls of the second metal layer.