Patent ID: 9299817
Filing Date: 2016-03-29
CPC Classification: H01L

Claim Text:
1. A bipolar junction transistor (BJT), comprising: a semiconductor substrate; a first well in the substrate and including an impurity of a first type; a second well at one side of the first well and including an impurity of a second type; a first device isolation layer in the first well and defining an emitter area; a second device isolation layer in the second well and defining a collector area; an emitter comprising an impurity of the second type on one side of the first device isolation layer in the emitter area and contacting a first electrode; a base comprising an impurity of the first type on another side of the first device isolation layer opposite of the emitter in the first well and contacting a second electrode; a collector comprising an impurity of the second type on a first side of the second isolation layer in the collector area of the second well and contacting a third electrode; and at least one patterned high concentration doping area comprising an impurity of the second type at high concentration in the second well, between a first side of the collector and the first well, and spaced apart from the collector by a first portion of the second well.