Patent ID: 6849871

Claim:
A bipolar transistor comprising: a substrate, an insulating layer over said substrate, a first single crystal semiconductor layer positioned over said insulating layer having a lightly doped region of a first type and at least one contiguous heavily doped region of said first type, said lightly doped region and said at least one contiguous heavily doped region functioning as a collector, wherein said lightly doped region is directly underneath a base, a second patterned semiconductor layer of a second type formed over said lightly doped region of said first semiconductor layer to function as the base, and a third patterned semiconductor layer of said first type position over said second semiconductor layer to function as an emitter, said lightly doped region of said first type having a dopant concentration to fully deplete of mobile charge through said first semiconductor layer to said insulating layer, wherein said doping concentration of said lightly doped region has a lowest doping concentration of said collector.