Patent ID: 8674480
Filing Date: 2014-03-18
Classification: H01L

Abstract:
1. A high voltage bipolar transistor with shallow trench isolation (STI) on bulk silicon substrate comprises, areas of a collector formed by implanting a first electric type impurity into an active area and connected with pseudo buried layers at two sides; the pseudo buried layers which are formed by implanting a high dose first type impurity into the bulk silicon substrate through the bottom of the STI at two sides forming PN junctions, do not touch directly and are linked up by the collector; when the first electric type of doping impurities is N type: dose range is 1e14˜1e16 cm when the first electric type of doping impurity is P type: dose range is 1e14˜1e16 cm deep contacts formed by implanting metals through oxide of interlayer dielectric and STI to contact the pseudo buried layers and pick up the collector; a base being deposited on the collector by epitaxial growth and in-situ doped by a second electric type impurity, in which an intrinsic base touches the collector and an extrinsic base is used for base pick-up; an emitter which is a polysilicon layer being deposited on the intrinsic base and doped with the first electric type impurity, and being picked up by a metal contact directly.