Patent ID: 6670600
Filing Date: 2003-12-30
Classification: B82Y,G02B,H01L,Y02E

Abstract:
A semiconductor photodetector, comprising:a substrate having a first surface on or over which semiconductor layers are formed and a second surface via which an incident light enters; a photo absorbing layer formed on or over said semiconductor layers; a semiconductor layer formed on or over said photo absorbing layer; a laminate reflector including a transparent film and a metal film, said transparent film being formed between said metal film and said semiconductor layer and made with spaces shaped in strips therein; and a plurality of narrow-stripe ohmic contact areas formed between said semiconductor layer and said metal film and defined by said spaces in said transparent film, wherein said incident light passes through said second surface, said first surface, said semiconductor layers, and said photo absorbing layer in order so as to be absorbed by said photo absorbing layer, a light passing via said photo absorbing layer passes said semiconductor layer to reach and be reflected by said metal film, and a size of each of said ohmic contact areas is determined to prevent said ohmic contact areas from focusing a reflected incident light.