Patent ID: 8026575
Filing Date: 2011-09-27
Classification: H01L

Abstract:
1. A semiconductor device having a bipolar transistor in a first region over a semiconductor substrate and an emitter pad electrically connected to an emitter of said bipolar transistor in a second region over said semiconductor substrate, said semiconductor device comprising: a first semiconductor layer formed over said semiconductor substrate and used for a collector of said bipolar transistor; a second semiconductor layer formed over said first semiconductor layer and used for the collector; a third semiconductor layer containing silicon germanium, being formed over said second semiconductor layer, and being used for a base of said bipolar transistor; a fourth semiconductor layer formed in said third semiconductor layer and used for the emitter of said bipolar transistor; a first electrode formed over said semiconductor substrate, electrically connected to said third semiconductor layer, and used for the base; a second electrode formed over said semiconductor substrate, electrically connected to said fourth semiconductor layer, and used for the emitter; a fifth semiconductor layer disposed so as to enclose said third and fourth semiconductor layers in a plan view and electrically connected to said first and second semiconductor layers; a third electrode formed over said semiconductor substrate, electrically connected to said fifth semiconductor layer, and used for the collector; a first groove being formed in said second region over said semiconductor substrate and reaching said semiconductor substrate; a first electrically conductive film being embedded in said first groove and electrically connecting a first pad to said semiconductor substrate; a second groove disposed so as to enclose said fifth semiconductor layer in a plan view in said first region over said semiconductor substrate and formed so as to penetrate said second and first semiconductor layers and reach said semiconductor substrate; and a first dielectric film embedded in said second groove.