Patent ID: 7821089

Claim:
A photodetector array comprising: a first semiconductor substrate having first and second main surfaces opposite to each other, the first semiconductor substrate being of a first conductivity and having a first doping concentration; a second semiconductor substrate having first and second main surfaces opposite to each other, the second semiconductor substrate being of the first conductivity and having a second doping concentration, the first main surface of the first semiconductor substrate being bonded to the second main surface of the second semiconductor substrate; at least one conductive via formed in the first main surface of the second semiconductor substrate, the at least one via extending to the second main surface of the first semiconductor substrate, the at least one conductive via being isolated from the first and second semiconductor substrates by a first dielectric material; an anode/cathode region proximate the first main surface of the second semiconductor substrate and the at least one conductive via, the anode/cathode region being of a second conductivity opposite to the first conductivity; and a doped isolation region formed in the first main surface of the second semiconductor substrate and extending through the second semiconductor substrate to the first semiconductor substrate, the doped isolation region having a third doping concentration different than the first doping concentration.