Patent ID: 7875948

Claim:
A backside illuminated image sensor, comprising: a light-receiving element disposed in a first substrate; an interlayer insulation layer disposed on the first substrate proximate the light-receiving element; an align key spaced apart from the light-receiving element and passing through the interlayer insulation layer and the first substrate; a plurality of interconnection layers disposed on the interlayer insulation layer in a multi-layered structure, wherein a backside of a backmost interconnection layer of the plurality of interconnection layers is electrically coupled to the align key; a front side passivation layer disposed on a frontmost layer of the plurality of interconnection layers; a backside passivation layer disposed on a backside of the first substrate; a transparent conductive layer disposed on the backside passivation layer proximate the light-receiving element, wherein the transparent conductive layer is electrically coupled to the align key; and a color filter and a microlens disposed on the transparent conductive layer in a region of the first substrate overlying the light-receiving element.