Patent ID: 8736009

Claim:
A method of fabricating an image sensor, the method comprising: forming a plurality of photoelectric conversion units in a substrate, the plurality of photoelectric conversion units separated from each other by a plurality of isolation regions; forming an insulating structure on the substrate, the insulating structure including a plurality of metal wiring layers; bonding a support substrate to a first surface of the substrate; etching a second surface of the substrate; partially exposing the plurality of metal wiring layers by forming a contact hole penetrating the substrate and a portion of the insulating structure; forming an insulating spacer on the sidewalls of the contact hole, the insulating spacer directly contacting the plurality of metal wiring layers; forming a conductive spacer on the insulating spacer, the conductive spacer electrically connected to the exposed metal wiring layers; and forming a conductive pattern on the second surface of the substrate, the conductive pattern including a pad and a contact, the pad electrically connected to the exposed metal wiring layers.