Patent ID: 8247853

Claim:
A pixel of an image sensor, comprising: a semi-conductive layer of a first conductivity type; a shallow isolation trench formed in the semi-conductive layer; a photodiode formed in the semi-conductive layer and configured to collect photo-generated charge; and a transfer gate configured to transfer photo-generated charge from the photodiode to a sensing node; wherein the photodiode includes: a pinning layer of the first conductivity type; a plurality of second doping regions of a second conductivity type formed to different depths in the semi-conductive layer; and one or more first doping regions of the first conductivity type formed between the plurality of second doping regions; wherein the one or more first doping regions and the plurality of second doping regions have doping concentrations that prevent a predetermined bias voltage for the photodiode from fully depleting the one or more first doping regions; and wherein the pixel further comprises a field stop region of the first conductivity type formed under the shallow isolation trench and contiguous with the pinning layer and the one or more first doping regions.