Patent ID: 6949764
Filing Date: 2005-09-27
Classification: H01L

Abstract:
1. 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 contiguous heavily doped region functioning as a collector, a top region of said lightly doped region is counter-doped to a second type to function as the base, a second patterned semiconductor layer of said second type formed over a region of said counter-doped region of said first semiconductor layer to function as the extrinsic base, and a third patterned semiconductor layer of said first type positioned over said counter-doped region of said first semiconductor layer to function as the 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.