Patent ID: 8173511
Filing Date: 2012-05-08
Classification: H01L

Abstract:
1. Method of manufacturing a semiconductor device with a substrate and a semiconductor body which is provided with at least one bipolar transistor having an emitter region, a base region and a collector region, wherein in the semiconductor body a first semiconductor region is formed that forms one of the collector and emitter regions and on the surface of the semiconductor body a stack of layers is formed comprising a first insulating layer, a polycrystalline semiconductor layer and a second insulating layer in which stack an opening is formed, after which by non-selective epitaxial growth a further semiconductor layer is deposited of which a monocrystalline horizontal part on the bottom of the opening forms the base region and of which a polycrystalline vertical part on a side face of the opening is connected to the polycrystalline semiconductor layer, after which spacers are formed parallel to the side face of the opening and a second semiconductor region is formed between said spacers forming the other one of the emitter and collector regions, characterized in that before the further semiconductor layer is deposited, the second insulating layer is provided with an end portion that viewed in projection overhangs an end portion of the underlying semiconductor layer.