Patent ID: 7595541

Claim:
A photo detector, comprising: a substrate; a semiconductor layer disposed on the substrate, wherein the semiconductor layer comprises a first doping region, a second doping region, and an intrinsic region located between the first doping region and the second doping region; an insulating layer covered on the semiconductor layer; an interlayer dielectric layer covered on the insulating layer, wherein the interlayer dielectric layer comprises at least three holes exposing a portion of the insulating layer, a portion of the first doping region and a portion of the second doping region, and the width of the portion of the insulating layer exposed by one of the holes is substantially greater than or substantially equal to the width of the intrinsic region; and two electrodes formed on a portion of the interlayer dielectric layer and electrically connected to the first doping region and the second doping region through two of the holes.