Patent ID: 9743026
Date: 2017-08-22
CPC Classifications: G01J,H01L,H04N

Claim:
1. A semiconductor photodetector comprising: at least one unit pixel including: wherein the photoelectric conversion part includes: a semiconductor layer having a first surface located on a place where incident light enters and a second surface opposite to the first surface; a first semiconductor part formed on the first surface of the semiconductor layer; a second semiconductor part formed on a part of the second surface of the semiconductor layer; a third semiconductor part formed inside the semiconductor layer and at a position which overlaps, in a plan view, the second semiconductor part; a fourth semiconductor part formed on the second surface of the semiconductor layer and in an area in which the second semiconductor part is not formed, the fourth semiconductor part having at least one of an impurity concentration different from that of the second semiconductor part and a conductive type different from that of the second semiconductor part; a first electrode disposed on the first surface of the semiconductor layer, and electrically connected to the first semiconductor part; and a second electrode disposed on the second surface of the semiconductor layer, and electrically connected to the second semiconductor part, and wherein the semiconductor layer, the first semiconductor part, and third semiconductor part are of a first conductive type, the second semiconductor part and the fourth semiconductor part are of a second conductive type different from the first conductive type, and the second semiconductor part has the impurity concentration higher than the impurity concentration of the fourth semiconductor part.