Patent ID: 6140196
Filing Date: 2000-10-31
Classification: H01L

Abstract:
A method of fabricating a high power bipolar junction transistor, comprising:providing a substrate of a first conductive type wherein the substrate comprises a buried region of the second conductive type to serve as a collector of a transistor wherein the second conductive type is opposite in polarity to the first conductive type;forming a trench within the substrate to expose the buried region wherein the substrate has a sidewall;forming a sinker of the second conductive type in the substrate sidewall;forming a first epitaxial layer of the second conductive type in the trench, wherein an upper surface of the first epitaxial layer is level with the substrate;forming a base of the first conductive type within the first epitaxial layer wherein a contact region of the base of the first conductive type is formed within the base; andforming an emitter of the second conductive type within the base and forming a contact region of the first conductive type of the collector within the sinker.