Patent ID: 9437717
Filing Date: 2016-09-06
CPC Classification: G06F,H01L

Claim Text:
1. A bipolar junction transistor comprising: an intrinsic base layer including a raised region with a first portion and a second portion, the second portion of the raised region being thinner than the first portion of the raised region, the intrinsic base layer including a top surface, a bulk layer, and an interface layer between the bulk layer and the top surface, the interface layer comprised of silicon, the bulk layer comprised of silicon-germanium, the interface layer of the first portion of the raised region has a first thickness, and the interface layer of the second portion of the raised region has a second thickness that is less than the first thickness; an emitter in a contacting relationship with the interface layer of the first portion of the raised region of the intrinsic base layer at the top surface; and an extrinsic base layer in a contacting relationship with the interface layer of the second portion of the raised region of the intrinsic base layer at the top surface, wherein the emitter and the first portion of the raised region of the raised region of the intrinsic base layer are vertically arranged, and a p-n junction is located at an interface between the interface layer of the intrinsic base layer and the emitter.