Patent ID: 6911716
Filing Date: 2005-06-28
Classification: H01L

Abstract:
1. A bipolar transistor, comprising: an intrinsic region having a vertical sequence of semiconductor layers, the sequence comprising a collector layer, a base layer in contact with the collector layer, and an emitter layer in contact with the base layer; an extrinsic region that includes a first semiconductor layer extending laterally from the base layer of the intrinsic region and a second semiconductor layer extending laterally from another semiconductor layer of the intrinsic region, the first semiconductor layer being located on a top surface of the second semiconductor layer; and an electrode located on the remaining one of the semiconductor layers of the intrinsic region; and wherein the first semiconductor layer of the extrinsic region has a same dopant-type as the base layer of the intrinsic region and has a higher concentration of dopant atoms than the base layer of the intrinsic region wherein the second semiconductor layer of the extrinsic region has a same dopant-type as the another semiconductor layer of the intrinsic region.