Patent ID: 9012279
Filing Date: 2015-04-21
Classification: H01L

Abstract:
1. A method of manufacturing SiGe HBT (Heterojunction Bipolar Transistors), comprising the following steps in the sequence set forth: forming shallow trenches in a silicon substrate; forming a pseudo buried layer at a bottom of each of the shallow trenches; filling an oxide into each of the shallow trenches to form shallow trench field oxides; forming a polysilicon gate with a thickness of greater than 150 nm above each of the shallow trench field oxides; forming a collector region beneath a surface of the silicon substrate, the collector region being sandwiched between the shallow trench field oxides and between the pseudo buried layers; forming a base region by growing a SiGe epitaxial layer on the polysilicon gates and the collector region; forming emitter region isolation oxides on a part of the base region on the collector region; forming an emitter region on the emitter region isolation oxides and a part of the base region.