Patent ID: 7709930
Filing Date: 2010-05-04
Classification: H01L

Abstract:
1. A semiconductor structure comprising: an active area having a first doping polarity and a first doping concentration; a substrate having a second doping polarity other than said first doping polarity; a first sub-collector overlying said substrate, said first sub-collector having said first doping polarity and a second doping concentration higher than said first doping concentration; a trench isolation region overlying said substrate and being disposed laterally adjacent to a portion of said active area; and a discontinuous second sub-collector overlying said substrate and having said first doping polarity, said second sub-collector being formed by implanting a dopant in a vertical direction into a portion of a semiconductor region exposed by a mask, said second sub-collector having a third doping concentration higher than said second doping concentration and including at least a portion disposed in the vertical direction below said isolation region and having a lateral discontinuity, wherein said second sub-collector includes a portion laterally adjacent to said active area, said active area adjoining said first sub-collector at said lateral discontinuity.