Patent ID: 8513759

Claim:
A photodiode array comprising: a first-conductive-type or semi-insulating semiconductor substrate of the photodiode array, wherein the substrate is InP; an insulating mask layer disposed on the InP substrate and having a plurality of openings; and semiconductor layers disposed in each of the openings, the semiconductor layers including an absorption layer, wherein the absorption layer includes a pn junction wherein a shape of the semiconductor layers including the absorption layer varies from one opening to another, and wherein the absorption layer has a multiple quantum well structure of GaAs 1−x−y Sb y N x (0 ≦x≦0.02) and a group III-V compound semiconductor containing nitrogen, and has an absorption edge wavelength corresponding to a combination of a thicknesses of the GaAs 1−x−y Sb y N x (0<x<0.02) and the group III-V compound semiconductor containing nitrogen; wherein the group III-V compound semiconductor containing nitrogen and the GaAs 1−x−v Sb y N x (0<<0.02) are lattice matched to the InP substrate, and wherein an anti-reflection film containing SiON or SIO is on a bottom of the InP substrate.