Patent ID: 6169005
Filing Date: 2001-01-02
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, which method comprises: forming a metal layer on a semiconductor substrate; forming a doped amorphous silicon layer having impurities on the metal layer; heating to form a metal silicide layer from the metal layer and the amorphous silicon layer; and heating to diffuse the impurities into the substrate to form source/drain regions having a junction depth below the metal silicide layer; wherein the step of forming the doped amorphous silicon layer includes: forming a first doped amorphous silicon film comprising a first conductivity type of impurity on the metal layer; providing a mask on the first doped amorphous silicon film, the mask having openings over portions of the metal layer; etching the first doped amorphous silicon film to expose the portions of the metal layer; and forming a second doped amorphous silicon film comprising a second conductivity type of impurity on the first doped amorphous silicon film and the exposed portions of the metal layer; wherein the second conductivity type of impurity does not substantially diffuse through the first doped amorphous silicon film during heating to diffuse the impurities into the substrate.