Patent ID: 9615041
Date: 2017-04-04
CPC Classifications: H01L,H04N

Claim:
1. A unit pixel of an image sensor, the unit pixel comprising: a color filter layer having a first surface; a photo-electric conversion region in a semiconductor layer and which accumulates electric charges according to incident light that passes through the color filter layer, the photo-electric conversion region contacting a front surface of the semiconductor layer, and the photo-electric conversion region being spaced a distance from the first surface of the color filter layer; a charge storage region in the semiconductor layer and which stores the accumulated electric charges, the charge storage region being laterally spaced apart from the photo-electric conversion region, and the charge storage region contacting the front surface of the semiconductor layer; and a light-blocking shield film on or above the charge storage region that prevents the incident light that passes through the color filter layer from propagating to the charge storage region, wherein the semiconductor layer has a back surface that faces towards the first surface of the color filter layer, and the front surface of the semiconductor layer is opposite the back surface and is coplanar with surfaces of the photo-electric region and the charge storage region, at least a portion of the shield film extends horizontally parallel to the first surface of the color filter layer as interposed between the color filter layer and the charge storage region, said portion of the shield film is spaced a distance from the first surface of the color filter layer and is spaced a distance from the front surface of the semiconductor layer, and the distance by which said portion of the shield film is spaced from the first surface of the color filter layer is greater than the distance by which the photo-electric conversion region is spaced from the first surface of the color filter layer.