Patent ID: 8497529
Filing Date: 2013-07-30
Classification: H01L

Abstract:
1. A device structure for a bipolar junction transistor fabricated using a silicon-on-insulator wafer having a semiconductor layer, a semiconductor substrate of a first conductivity type, and an insulator layer between the semiconductor layer and the semiconductor substrate, the device structure comprising: a first trench extending from a top surface of the semiconductor layer through the semiconductor layer and the insulator layer into the semiconductor substrate; a first doped region in the semiconductor substrate, the first doped region extending about the first trench and having a second conductivity type opposite to the first conductivity type; a second trench extending from the top surface of the semiconductor layer through the semiconductor layer and insulator layer into the semiconductor substrate; a second doped region in the semiconductor substrate, the second doped region extending about the second trench and having the second conductivity type; a first contact extending from the top surface through the semiconductor layer and the insulator layer to the first doped region; a second contact extending from the top surface through the semiconductor layer and the insulator layer to the second doped region; and a third contact extending from the top surface through the semiconductor layer and the insulator layer to a portion of the semiconductor substrate laterally between the first doped region and the second doped region, wherein the first doped region is an emitter of the bipolar junction transistor, the second doped region is a collector of the bipolar junction transistor, and the portion of the semiconductor substrate is a base of the bipolar junction transistor.