Patent ID: 7378687
Filing Date: 2008-05-27
Classification: H01L

Abstract:
1. A photothyristor device comprising: a silicon substrate; a transistor portion including an anode region, a gate region and a cathode region and placed on a first main surface of the silicon substrate; a light-receiving portion for receiving light from the outside; an anode electrode and a cathode electrode each electrically connected to a corresponding one of said anode region and said cathode region; and a channel stopper electrode surrounding the anode electrode and the cathode electrode, said light receiving portion including an oxygen-doped polysilicon film placed above said silicon substrate and being disposed to surround said transistor portion, each of said anode electrode and said cathode electrode being placed above said transistor portion and having a double-structure comprising a center portion and an outer portion surrounding the center portion, the center portion and the outer portion being electrically connected, and an opening being provided between the center portion and the outer portion in each of the anode electrode and the cathode electrode so that at least part of a pn junction formed between the silicon substrate and the anode region is located in the opening in plan view of the photothyristor device.