Patent ID: 9041841
Filing Date: 2015-05-26
Classification: H01L,H04N

Abstract:
1. A backside illuminated image sensor comprising: a substrate with a pixel region and a logic region, the substrate comprising a first side and a second side opposite the first side, the logic region providing input and output connections to the pixel region; a first active device in the pixel region, wherein the first active device is at least partially located on the first side of the substrate and wherein the first active device comprises a photosensitive element positioned to receive light from the second side of the substrate; a second active device in the logic region at least partially located on the first side of the substrate; a first protective layer over the first side of the substrate in the pixel region, wherein the logic region is free from the first protective layer; a second protective layer over the logic region and the first protective layer in the pixel region; and a contact etch stop layer over the second protective layer, wherein the first protective Layer, the second protective layer, and the contact etch stop layer form a dielectric reflector Located to reflect light to the photosensitive element.