Patent ID: 7129530

Claim:
A semiconductor device comprising: a semiconductor substrate; a collector layer formed on the semiconductor substrate; a silicon-containing conductive layer formed on the collector layer and including a side surface; and a silicon film formed on the silicon-containing conductive layer and including a first region, which functions as an emitter layer, and a second region including a side surface; an emitter electrode formed on the silicon film and including a side surface and a bottom surface, in which the bottom surface contacts the first region of the silicon film; a side wall film covering the side surface of the emitter electrode and including a lower surface, the bottom surface of the emitter electrode being further from the substrate than the lower surface of the side wall film, and at least part of the second region of the silicon film being located between the silicon-containing conductive layer and the side wall film and contacting both the silicon-containing conductive layer and the side wall film; an impurity region containing silicon formed adjacent to the silicon-containing conductive layer, the impurity region functioning as an external base layer and including a surface; and a silicide film formed along the side surface of the second region, the side surface of the silicon-containing conductive layer, and the surface of the impurity region.