Patent ID: 6780724
Filing Date: 2004-08-24
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising the steps of:providing a semiconductor body, at a surface, with an isolation region which is recessed in the semiconductor, defining a continuous active region in the semiconductor body by the isolation region, forming a transistor having, adjacent to the surface, emitter and collector regions of a first conductivity type and a base region of the opposite, second conductivity type providing said emitter, base and collector regions with a contact region by depositing a first silicon layer on the surface, from which silicon layer two of said three contact regions are formed, which are mutually separated by an intermediate region, removing the first semiconductor layer, which intermediate region extends transversely over the length of the active region, depositing a second silicon layer which is electrically insulated from the first silicon layer, and forming the third contact region from which second silicon layer at the location of the intermediate region between the two contact regions characterized in that the, method includes the steps of: doping a first contact region of the two contact regions formed from the first semiconductor layer, which is connected to the collector region, with an impurity of the first conductivity type, and doping a second contact region, which is connected to the base region, with an impurity of the second conductivity type, the semiconductor body being doped, after the removal of the first semiconductor layer in the intermediate region, at the location of said intermediate region with an impurity of the second conductivity type to form a part of the base region which forms an intrinsic base region, after which the second semiconductor layer is deposited, from which the emitter contact and the emitter region of the first conductivity type are formed, and in a stage after the first semiconductor layer has been removed at the location of the intermediate region and before the second semiconductor layer is deposited, strips of an electrically insulating material separating the emitter region from the isolation region are formed at two opposite sides of the active region at the location where the intermediate region between the base contact and the collector contact is adjacent to the isolation region.