Patent ID: 6396124
Filing Date: 2002-05-28
Classification: H01L

Abstract:
A semiconductor device comprising a semiconductor body (10) the surface of which is provided with an insulating layer (20) and which comprises, in succession, a substrate (11) of a first conductivity type, a first semiconductor region (1) of a second conductivity type which is opposite to the first conductivity type, which semiconductor region forms a collector region of a bipolar transistor and is provided with a first connection conductor (7), a second semiconductor region (2) of the first conductivity type, which forms a base region of the transistor and is provided with a second connection conductor (8), and a third semiconductor region (3) of the second conductivity type which forms an emitter region of the transistor and is provided with a third connection conductor (9), at least one of the connection conductors (7, 8, 9) extending over a part of the insulating layer (20) below which there is a further semiconductor region (4) of the second conductivity type, characterized in that a part (4b) of the further semiconductor region (4) adjoining the substrate (11) is provided with a doping concentration which is higher than that in the remaining part (4a) of the further semiconductor region (4).