Patent ID: 7256062

Claim:
A method for producing a semiconductor photo-detector comprising: (a) forming a bottom semiconductor layer having a first conduction type on a substrate, said bottom semiconductor layer having a top surface and an edge, and said top surface meeting an end surface at said edge, said end surface having a light incident facet provided by a step (e) below, and said edge being located at a side of said end surface; (b) forming a growth layer comprising a photo-absorption part including a photo-absorption layer on said bottom semiconductor layer, said photo-absorption layer being spaced from said edge; (c) forming a top semiconductor layer having the same first conduction type as tat of the bottom semiconductor layer on said growth layer; (d) forming a converted region having a second conduction type in a main inside part of said top semiconductor layer at an exposed surface side thereof; and (e) providing said light incident facet, having an acute angle with said top surface, on said end surface of the substrate side of said growth layer except for said photo-absorption layer or said end surface of said substrate, such that incident light applied to said light incident facet is refracted at said light incident facet and is transmitted to said photo-absorption layer at an angle with respect to an orthogonal of said photo-absorption layer.