Patent ID: 6300210
Filing Date: 2001-10-09
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising a semiconductor body (10) including a bipolar transistor having a base region (1), a collector region (2) and an emitter region (3), a monocrystalline silicon substrate (11) being provided with a first insulating layer (4), a polycrystalline layer (5) of silicon and a second insulating layer (6), an opening (7) being formed in this layer structure, which opening extends to a monocrystalline part of the semiconductor body (10), the bottom of the opening (7) being provided with a third insulating layer (8), at least a part (1A) of the base region (1) being formed via said opening (7) by providing doping atoms in the monocrystalline part of the semiconductor body (10), and the emitter region (3) being formed by means of a further opening (9) in the third insulating layer (8), which opening is smaller than the first opening (7) in the monocrystalline part of the semiconductor body (10), characterized in that the doping atoms are provided in the monocrystalline part of the semiconductor body (10) before the third insulating layer (8) is applied, the third insulating layer (8) is formed by means of deposition, and the semiconductor body (10) is heated, after the provision of the third insulating layer and before forming the further opening in the third insulating layer (8), in an atmosphere comprising a gaseous compound (40) which comprises oxygen.