Patent ID: 6709941
Filing Date: 2004-03-23
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device comprising:providing an N type single-crystal silicon substrate having a first silicon oxide film and a P type poly-crystal silicon layer formed thereon; forming a silicon nitride film on the P type poly-crystal silicon layer, wherein a side wall of the silicon nitride film is formed in an opening in the P type poly-crystal silicon layer above a portion expected to provide an active region, and the first silicon oxide film has an opening therein which is larger than the opening formed in the P type poly-crystal silicon layer; growing an N type IV-group semiconductor mixed crystal layer having a smaller band gap than silicon to a desired thickness on the single-crystal silicon substrate on which a surface of the portion expected to provide said active region is exposed; growing a non-doped single-crystal silicon layer on the IV-group semiconductor mixed crystal layer to a desired thickness; diffusing boron at a desired concentration from a surface of the non-doped single-crystal silicon layer; and forming a side wall containing a second silicon oxide film on an inner side of the side wall of the silicon nitride film and then growing a phosphorus-doped N type poly-crystal silicon layer throughout on the surface to perform processing and phosphorus diffusion on said N type poly-crystal silicon layer in order to provide an emitter electrode.