Patent ID: 7911033

Claim:
A bipolar transistor with a depleted emitter, comprising: a base layer doped with a first dopant of one polarity; an emitter layer disposed above said base layer and doped with a second dopant of an opposite polarity to said first dopant to create an emitter-base junction; a thin termination layer disposed on top of said emitter layer and doped with heavy doping of said second dopant, wherein the dopant of said termination layer stays within said emitter layer, such that said emitter-base junction does not become a normal n + -p or p + -n junction and the built-in potential of said emitter-base junction ranges from about 0.9 eV to about 0.4 eV; and a metallization layer disposed above said termination layer, wherein said termination layer can provide an ohmic contact to said metallization layer.