Patent ID: 9748369
Date: 2017-08-29
CPC Classifications: H01L

Claim:
1. A bipolar transistor device, comprising: a substrate including a semiconductor layer overlying an insulating layer; a transistor base comprising a base region in the semiconductor layer doped with a first conductivity type dopant at a first dopant concentration; a transistor emitter comprising an emitter region doped with a second conductivity type dopant and located adjacent one side of the base region; a transistor collector comprising a collector region doped with the second conductivity type dopant and located adjacent an opposite side of the base region; and an epitaxial semiconductor material base contact region having a bottom surface in contact with a top surface of the base region; sidewall spacers; a replacement metal gate over and in electrical contact with said epitaxial semiconductor material base contact region, wherein said replacement metal gate includes a metal liner in contact with sides of said sidewall spacers and a metal fill between the sidewall spacers and the metal liner; and wherein said epitaxial semiconductor material base contact region is doped with the first conductivity type dopant at a second dopant concentration greater than the first dopant concentration.