Patent ID: 7700448

Claim:
A manufacturing method of a semiconductor device, comprising the steps of: (a) preparing a semiconductor substrate; (b) forming a trench for element isolation in the semiconductor substrate; (c) forming an element isolation region which includes an insulator embedded in the trench for element isolation; (d) forming a gate insulating film over the semiconductor substrate; (e) forming a gate electrode over the gate insulating film; (f) forming a semiconductor region for a source or a drain in the semiconductor substrate; (g) forming a metallic film over the gate electrode, and the semiconductor substrate including the semiconductor region upper part; (h) forming a first barrier film over the metallic film; (i) forming a metal silicide layer by making the metallic film, and the gate electrode or the semiconductor region react by performing first heat treatment; and (j) after the step (i), removing the first barrier film and the metallic film, and leaving the metal silicide layer over the gate electrode or the semiconductor region; wherein the first barrier film is a film which makes the semiconductor substrate generate tensile stress; at the step (i) the metal silicide layer which includes mono-silicide of metallic element which forms the metallic film is formed, the metallic film is a Ni film, and the first heat treatment of the step (i) is performed at between 400° C. and less than 500° C.