Patent ID: 6908804

Claim:
A method of manufacturing a bipolar transistor comprising a collector region ( 1 ) with a first doping type, and a base region ( 2 ) with a second doping type on which an emitter region ( 3 ) with a first doping type is formed, the emitter region ( 3 ) comprising a layer ( 6 ) of a first semiconductor material and a layer ( 7 ) of a second semiconductor material, characterized in that the emitter region ( 3 ) is formed by epitaxially providing a first layer ( 6 ) of the first semiconductor material, after which a second layer ( 7 ) of the second semiconductor material is subsequently epitaxially provided and doped with a first doping type such that Auger recombination occurs, and the intrinsic carrier concentration of the second semiconductor material exceeds the intrinsic carrier concentration of the first semiconductor material.