Patent ID: 9257577
Filing Date: 2016-02-09
CPC Classification: H01L

Claim Text:
1. A light receiving element comprising: a substrate of a first conduction type; a light absorbing layer of the first conduction type formed on the substrate and having a bandgap smaller than that of the substrate; a diffusion layer of a second conduction type formed on a portion of the light absorbing layer; a window layer of the first conduction type formed on the light absorbing layer so as to surround the diffusion layer and having a bandgap larger than that of the light absorbing layer; an anode electrode formed on the diffusion layer; and a cathode electrode provided on the substrate so as to contact the substrate without contacting each of the window layer and the light absorbing layer, wherein a groove is formed which surrounds a boundary between the diffusion layer and the window layer as viewed in plan and extends through the window layer and the light absorbing layer as viewed in section.