Patent ID: 8227832
Filing Date: 2012-07-24
Classification: H01L

Abstract:
1. A SiGe heterojunction bipolar transistor (HBT) multi-finger structure, consisting of a plurality of SiGe HBT single cells; the multi-finger structure being expressed as C/BEBC/BEBC/.../C, wherein C, B and E respectively represents a collector, a base and an emitter of a SiGe HBT, and CBEBC represents a SiGe HBT single cell, two neighboring SiGe HBT single cells sharing a same collector; an active region of a SiGe HBT single cell being isolated by field oxide shallow trenches, wherein a SiGe HBT single cell comprises: a collector region, consisting of an n type ion impurity implanted layer formed in the active region, the bottom of the collector region being connected to a buried layer formed by two n type pseudo buried layers at both sides of the active region, the collector region being connected to two collectors through the two n type pseudo buried layers and two deep trench contacts formed in the field oxide above the n type pseudo buried layers; a base region, consisting of a p type SiGe epitaxial layer formed on top of the collector region, the base region being connected to two bases through two polysilicon layers at both sides of the base region and two metal contacts formed on the polysilicon layers; and an emitter region, consisting of an n type polysilicon layer formed on top of the base region, the emitter region being connected to an emitter through a metal contact formed on top of the emitter region.