Patent ID: 8603873
Filing Date: 2013-12-10
Classification: H01L

Abstract:
1. A method for forming a bipolar junction transistor, the method comprising: forming a first well of a second conductive type for forming a collector region in a substrate including a device isolation layer, wherein the substrate comprises a first conductive type; forming a second well of the first conductive type for a metal-oxide-semiconductor transistor of the second conductive type within the first well of the second conductive type, wherein the second well of the first conductive type is formed deeper than the device isolation layer; forming a shallow third well of the first conductive type for a base region within the first well of the second conductive type, wherein the shallow third well of the first conductive type is formed shallower than the device isolation layer; and simultaneously forming an emitter region within the shallow third well of the first conductive type and a collector contact within the first well of the second conductive type by performing an ion implantation process for forming source/drain regions of the metal-oxide-semiconductor transistor of the second conductive type, wherein the first well is formed deeper in the substrate than all other wells or regions formed in the substrate.