Patent ID: 7863082

Claim:
A method for fabricating a photo diode comprising: providing a substrate; forming a plurality of insulation layers in the substrate; forming a doping area in the substrate being surrounded by the insulation layers; forming a dielectric layer on the substrate; forming a first conductive layer on the dielectric layer; etching the first conductive layer and the dielectric layer to form an opening in order to expose a surface of the doping area; forming a second conductive layer on the first conductive layer and the opening; patterning the second conductive layer to form a wire on a first side of the doping area; after forming the wire, patterning the first conductive layer to form a gate on a second side of the doping area, the second side being different from the first side; and forming a source or drain on a side of the gate and in the substrate, the side being different from the first side and the second side.