Patent ID: 7875943

Claim:
A semiconductor photoreceptor device comprising: a semi-insulating semiconductor substrate; a first semiconductor layer of a first conductivity type disposed on said semiconductor substrate and having a first electrode disposed thereon; an optical waveguide layer disposed on said first semiconductor layer and including a first cladding layer of the first conductivity type, a light absorption layer, and a second cladding layer of a second conductivity type, laminated on one another, over said first semiconductor layer, in that order; a semi-insulating semiconductor burying layer disposed on said first cladding layer such that sides of said optical waveguide layer are buried in said semi-insulating semiconductor burying layer; and a second electrode including: an electrode portion disposed on said second cladding layer of said optical waveguide layer; a lead-out portion extending on a side wall of said semi-insulating semiconductor burying layer from said electrode portion and extending on said semiconductor substrate, wherein said side wall of said semi-insulating semiconductor burying layer is located on a rear surface of said optical waveguide layer, and the rear surface faces a light incident surface of said optical waveguide layer; and an electrode pad disposed on a surface of said semiconductor substrate, with an insulating film between said electrode pad and said semiconductor substrate, said electrode pad being connected to said lead-out portion.