Patent ID: 8921829
Filing Date: 2014-12-30
Classification: H01L

Abstract:
1. A light receiving element array in which a plurality of light receiving elements are arranged, the light receiving element array comprising: a substrate composed of a compound semiconductor, the substrate having a rear surface that is configured to receive light incident thereon; an n-type buffer layer disposed on the substrate; an absorption layer disposed on the n-type buffer layer, the absorption layer having a type-II multi-quantum well structure; a contact layer disposed on the absorption layer; and a p-type region that is provided for each of the light receiving elements, the p-type region extending from a surface of the contact layer to into the n-type buffer layer through the absorption layer so as to form a p-n junction, wherein the p-type region is formed by selectively diffusing a p-type impurity in a depth direction, the p-type region of a light receiving element is separated from the p-type region of an adjacent light receiving element by a region that is not subjected to selective diffusion, and the p-n junction is formed in the n-type buffer layer on a crossed face of a p-type carrier concentration of the p-type region and an n-type carrier concentration of the n-type buffer layer.