Patent ID: 7482672

Claim:
A semiconductor device structure on an insulating layer, the semiconductor device structure comprising: a semiconductor body having a top surface and a plurality of sidewalls extending from said top surface toward the insulating layer; a collector region composed of a first semiconductor material with a first conductivity type, said collector region disposed on said top surface and said sidewalls of said semiconductor body; a base region composed of a second semiconductor material with a second conductivity type, said base region disposed on said top surface and said sidewalls of said semiconductor body with said collector region positioned between said base region and said semiconductor body, and said collector region and base region including a first interface defining a first junction that extends across said top surface and along said sidewalls of said semiconductor body; and an emitter region composed of a third semiconductor material doped to have said first conductivity type, said emitter region disposed on said top surface and said sidewalls of said semiconductor body with said base region and said collector region positioned between said emitter region and said semiconductor body, and said emitter region and said base region including a second interface defining a second junction that extends across said top surface and along said sidewalls of said semiconductor body.