Patent ID: 7955925

Claim:
A method of manufacturing a semiconductor device comprising the steps of: (a) providing a semiconductor substrate; (b) forming a semiconductor region on the semiconductor substrate; (c) forming a metal film on the semiconductor substrate including on the semiconductor region; (d) performing a first heat treatment so that the metal film and the semiconductor region are reacted, thereby forming a metal silicide layer formed of a monosilicide of a metal element forming the metal film; (e) removing the unreacted metal film, and leaving the metal silicide layer on the semiconductor region after the step (d); then (f) performing a second heat treatment whose heat treatment temperature is higher than that of the first heat treatment after the step (e); and (g) forming an insulating film on the semiconductor substrate including on the metal silicide layer after the step (f), wherein the heat treatment temperature of the second heat treatment of the step (f) is lower than a first temperature at which a lattice size of a disilicide of the metal element forming the metal film and a lattice size of the semiconductor substrate become same with each other.