Patent ID: 6930011

Claim:
A method of manufacturing a semiconductor device which comprises a first semiconductor region of a first conductivity type with a first connection conductor forming a collector region of a bipolar transistor, a second semiconductor region of a second conductivity type opposed to the first conductivity type with a second connection conductor forming a base region of the transistor, and a third semiconductor region of the first conductivity type with a third connection conductor forming an emitter region of the transistor; said method comprising: forming the first semiconductor region of the first conductivity type; forming the second semiconductor region on the first semiconductor region, the second semiconductor region having a partial region with a smaller flux of dopant atoms than another part of the second semiconductor region; forming the third semiconductor region which lies recessed in the other part, and outside the partial region, of the second semiconductor region; and providing first, second and third connection conductors to the first, second and third regions wit a connection conductor respectively, wherein the second conductor is exclusively connected to the second semiconductor region and adjoins the partial region of he second semiconductor region.