Patent ID: 8293122

Claim:
A method for fabricating a backside illuminated sensor device, the method comprising: providing a substrate having a front surface and a back surface; forming one or more sensor elements on the front surface of the substrate; forming one or more metal layers over the front surface of the substrate, wherein forming a first metal layer comprises: forming a first conductive layer over the front surface of the substrate; removing the first conductive layer from a first region of the substrate; forming a second conductive layer over the front surface of the substrate to be in direct contact with an interlayer dielectric (ILD) layer in the first region and to be over the first conductive layer in a second region; and removing portions of the second conductive layer from the first region and the second region of the substrate, wherein the first metal layer in the first region comprises the second conductive layer and the first metal layer in the second region comprises the first conductive layer and the second conductive layer.