Patent ID: 7709919
Filing Date: 2010-05-04
Classification: G02B,H01L

Abstract:
1. A solid state image sensing device comprising: a photodiode region; and a transistor region, wherein the photodiode region comprises: a semiconductor substrate; a first anti-reflection layer formed on the semiconductor substrate; a second anti-reflection layer formed on the first anti-reflection layer; and a top layer formed on the second anti-reflection layer, wherein each of the semiconductor substrate and the second anti-reflection layer is formed of a first material, and each of the first anti-reflection layer and the top layer is formed of a second material different from the first material, wherein the first material comprises polysilicon, wherein the semiconductor substrate receives an incident light from the exterior through the first anti-reflection layer, the second anti-reflection layer and the top layer, and wherein the refractive indexes and dispersions of the photodiode region are matched to provide uniform anti-reflection.