Patent ID: 7569891

Claim:
A semiconductor device comprising: a p-type semiconductor substrate; a first source and drain regions separately provided in the semiconductor substrate, each of the first source and drain regions including: an n-type diffusion layer; a first silicide layer formed on the n-type diffusion layer and containing a first metal element as a main component having a vacuum work function of 4.6 eV or greater; and a segregating layer located at an interface between the n-type diffusion layer and the first silicide layer and containing at least one second metal element selected from the group of scandium elements or lanthanoid, a region of the segregating layer having an areal density of 1×10 14 cm −2 or higher and a thickness smaller than 1 nm; a first gate insulating film provided on a region between the first source and drain regions of the semiconductor substrate; and a first gate electrode provided on the first gate insulating film.