Patent ID: 7964928

Claim:
A photodetector made in monolithic form in a lightly-doped substrate of a first conductivity type, the photodetector comprising: at least first, second and third photodiodes adapted to receive light rays respectively having first, second and third wavelengths, the first wavelengths being shorter than the second wavelengths and the second wavelengths being shorter than the third wavelengths; a first region of the first conductivity type more heavily doped than the substrate extending under the first photodiode and delimiting a first substrate portion under the first photodiode, and also extending at least between the second and third photodiodes; and a second region of the first conductivity type more heavily doped than the substrate and extending under the first region and under the first and second photodiodes, the second region delimiting, with the first region, a second substrate portion under the second photodiode and a third substrate portion under the third photodiode, wherein the first substrate portion has a first depth, the second substrate portion has a second depth, and the third substrate portion has a third depth, the third depth being greater than the second depth and the second depth being greater than the first depth.