Patent ID: 9130003
Filing Date: 2015-09-08
Classification: H01L

Abstract:
1. A structure for picking up a collector region, the collector region being formed in a substrate and having a core portion located between two isolation regions and a lateral portion adjacent to and underlying each of the two isolation regions, the structure comprising: a pair of polysilicon stacks formed in the substrate and extending downward through the isolation regions into a depth greater than a depth of the collector region, the pair of polysilicon stacks comprising an undoped polysilicon layer and a doped polysilicon layer located on the undoped polysilicon layer, the doped polysilicon layer having an opposite conductivity type to a conductivity type of the substrate; and a pair of collector electrodes contacting on the polysilicon stacks, wherein the depth of the collector region is smaller than a depth of the doped polysilicon layer and greater than a depth of the isolation regions, the doped polysilicon layer having a side face contacting with the lateral portion of the collector region.