Patent ID: 7768086
Filing Date: 2010-08-03
Classification: H01L

Abstract:
1. A back illuminated photodetector comprising: a first conductive type semiconductor substrate; a second conductive type impurity semiconductor region provided in a first superficial surface layer of said semiconductor substrate; a recessed portion for incidence of to-be-detected light formed in a second surface of said semiconductor substrate and in an area opposite said impurity semiconductor region; a coating layer made of resin for transmitting said to-be-detected light to said recessed portion and having a substantially flat surface, said coating layer being provided on the second surface; and a window plate provided on said substantially flat surface of said coating layer to transmit said to-be-detected light to said coating layer, wherein said coating layer consists of a first resin layer provided on the second surface and a second resin layer provided on said first resin layer and having said substantially flat surface on the opposite side of said first resin layer, wherein said first resin layer is arranged in such a manner that a portion of the first resin layer provided on said recessed portion in the second surface is sunk lower than a portion of the first resin layer provided on an outer edge portion of said recessed portion, wherein said window plate has a square cross-sectional shape with at least one corner being chamfered in a plane perpendicular to the thickness direction thereof, and wherein the surface of the coating layer is exposed from a chamfered portion.