Patent ID: 8120069

Claim:
A photodiode for a pixel of an image sensor, the photodiode comprising: a semi-conductive layer of a first conductivity type; a plurality of doping regions of a second conductivity type at different depths in the semi-conductive layer; a doping region of the first conductivity type between doping regions from the plurality of doping regions of the second conductivity type, wherein the doping region of the first conductivity type is configured to define a plurality of junction capacitances and to prevent full depletion when a bias voltage is applied to deplete the photodiode; a pinning layer of the first conductivity type underneath a surface of an oxide layer; and a counter-doping region in a portion of the doping region of the first conductivity type, wherein in the counter-doping region is configured to provide second conductivity-type continuity between regions from the plurality of doping regions of the second conductivity type disposed above and below the doping region of the first conductivity type.