Patent ID: 8159287
Filing Date: 2012-04-17
Classification: H01L

Abstract:
1. A heterojunction bipolar transistor device for operation as a field-effect transistor device which is responsive to an input voltage for application to a base/gate terminal to control current flow between an emitter/source terminal and a collector/drain terminal, comprising: a layered semiconductor heterojunction structure including a base/gate layer of a first semiconductor type disposed between an emitter/source layer of a second semiconductor type and a collector/drain layer of said second semiconductor type; said emitter/source layer comprising a higher bandgap material than said base/gate layer; said base/gate layer having a thickness of less than about 100 Angstroms; an emitter/source terminal coupled with said emitter/source layer, a base/gate terminal coupled with said base/gate layer, and a collector/drain terminal coupled with said collector/drain layer; whereby, application of said input voltage to said base/gate terminal is operative to control current flow between said emitter/source and said collector/drain.