Patent ID: 8847286

Claim:
A back side illuminated (BSI) image sensor, comprising: an Si substrate having a back side and a front side opposite to the back side, the Si substrate including a pixel array region and a logic region outside the pixel array region; a multilayer structure formed on the back side of the Si substrate and corresponding to the pixel array region; and a plurality of pixels formed on the front side of the Si substrate and in the pixel array region, each pixel comprising: a photo-sensitive element configured to convert light, which is incident upon the back side and transmitted through the multilayer structure and the Si substrate, into image data, and a transistor coupled to the photo-sensitive element to transfer the image data to circuitry in the logic region; wherein the multilayer structure comprises an SiC layer formed over the back side of the Si substrate, and an SiOC layer formed over and in direct contact with the SiC layer.