Patent ID: 7952165
Filing Date: 2011-05-31
Classification: H01L

Abstract:
1. A heterojunction bipolar transistor (HBT) comprising: a stack including, from top to bottom, an emitter, a base and a collector; an extrinsic base adjacent to said base and located directly on an upper surface of said collector, wherein a lateral dimension of said extrinsic base is defined by the footprint of a sacrificial spacer, and wherein said base and said extrinsic base are both comprised of a same single-crystal semiconductor material; a metal-semiconductor alloy region located directly on an upper surface of said extrinsic base; buried conductive lines connecting to an edge of said metal-semiconductor alloy region; a shallow trench isolation region adjacent to said collector; and an insulator located directly on and in contact with an upper surface of the shallow trench isolation region, and wherein a portion of said buried conductive lines is located directly on and in contact with an upper surface of the insulator.