Patent ID: 8008696

Claim:
A semiconductor structure comprising: a first photosensitive diode located in a semiconductor substrate and comprising a first charge collection well and a first semiconductor portion, wherein said first semiconductor portion abuts a bottom surface of said first charge collection well, comprises a first semiconductor material, and has a doping of a first conductivity type, wherein said first charge collection well comprises said first semiconductor material and has a doping of a second conductivity type, wherein said second conductivity type is the opposite of said first conductivity type; and a second photosensitive diode located in said semiconductor substrate and comprising a second charge collection well and a second semiconductor portion, wherein said second semiconductor portion abuts a bottom surface of said second charge collection well, comprises a second semiconductor material, and has a doping of said first conductivity type, wherein said second charge collection well comprises said second semiconductor material and has a doping of said second conductivity type, and wherein said second semiconductor material is different from said first semiconductor material.