Patent ID: 7863644

Claim:
A bipolar transistor comprising: a semiconductor material of a first conductivity type, the semiconductor material having a top surface and a bottom surface; an emitter region of a second conductivity type located in the semiconductor material, the emitter region touching the top surface of the semiconductor material; a base region of the first conductivity type located in the semiconductor material, the base region touching the emitter region and the top surface of the semiconductor material; a collector region of the second conductivity type located in the semiconductor material, the collector region lying below the base region and the emitter region, having a bottom surface, being spaced apart from the emitter region and the top surface of the semiconductor material, and touching the base region, all of the bottom surface of the collector region being vertically spaced apart from the bottom surface of the semiconductor material; a collector contact region of the second conductivity type located in the semiconductor material, the collector contact region touching the collector region, having a dopant concentration that is greater than a dopant concentration of the collector region, and lying directly vertically below and spaced apart from the base region; and a metallic structure that lies entirely directly vertically below the collector region, the metallic structure being electrically connected to the collector contact region.