Patent ID: 9466687
Filing Date: 2016-10-11
CPC Classification: H01L

Claim Text:
1. A method for forming an electronic device, comprising the steps of: providing a semiconductor containing substrate having a first surface; forming a bipolar transistor by providing in the substrate, a base of a first conductivity type and a first dopant density, an emitter of a second opposite conductivity type and a second dopant density, and a collector of the second conductivity type and a third dopant density, wherein a portion of the base, a base contact and the emitter extend to the first surface; and forming in the portion of the base at the first surface a further region of the second conductivity type and a fourth dopant density located laterally between the base contact and the emitter, wherein the forming the further region includes performing a first implant; forming, in the portion of the base, a still further region of the second conductivity type, the still further region being next to the emitter, the forming the still further region includes performing a second implant; wherein the further region extends to the base contact and the still further region at the first surface, the still further region extends to the emitter.