A photodiode has a photodiode gate structure on the surface of the substrate. The photodiode may be located in a pixel sensor cell comprising a substrate having a first surface level. The photodiode has a first doped region of a first conductivity type and a second doped region of a second conductivity...http://www.google.fr/patents/US7253392?utm_source=gb-gplus-shareBrevet US7253392 - Image sensor with photo diode gate
