Patent ID: 8558282

Claim:
A semiconductor structure comprising a bipolar junction transistor (BJT), wherein said BJT comprises: a doped germanium layer in contact with an insulator layer and including a germanium base region comprising dopants of a first conductivity type, a germanium emitter region in contact with said germanium base region and comprising dopants of a second conductivity type that is the opposite type of said first conductivity type, and a germanium collector region in contact with said germanium base region and comprising dopants of said second conductivity type; a silicon passivation layer in contact with said doped germanium layer and including a silicon base region, a silicon emitter region in contact with said silicon base region, and a silicon collector region in contact with said silicon base region, wherein said silicon base region comprises dopants of said first conductivity type and contacts said germanium base region, said silicon emitter region comprises dopants of said second conductivity type and contacts said germanium emitter region, and said silicon collector region comprises dopants of said second conductivity type and contacts said germanium collector region; and an extrinsic base region in contact with said silicon base region.