Patent ID: 6507059
Filing Date: 2003-01-14
Classification: H01L

Abstract:
A structure of CMOS image sensor, the image sensor comprisinga substrate; a photodiode sensing region mounted on the substrate; a transistor element region mounted on the substrate, wherein the photodiode sensing region and the transistor element region are isolated by an isolation layer; a transistor mounted on the transistor element region, wherein the transistor includes a gate oxide layer, a gate electrode conductive layer, a spacer and a source/drain region; a self-aligned barrier mounted on the photodiode sensing region; a first protective layer mounted on the substrate and at least covering the self-aligned barrier for improving quantum efficiency by providing a refracted incident light path to the photodiode and reducing dark current; a plurality of dielectric layers, wherein each of the dielectric layers, being separated from the first protective layer at different heights, is mounted on the first protective layer; a plurality of second protective layers for improving quantum efficiency by providing a refracted incident light path to the photodiode, wherein each of the second protective layers is located between adjacent dielectric layers.