Patent ID: 7348230

Claim:
A manufacturing method of a semiconductor device having a MISFET, comprising the steps of: (a) preparing a semiconductor substrate; (b) forming a gate insulating film of the MISFET over the semiconductor substrate; (c) forming a gate electrode of the MISFET over the gate insulating film; (d) introducing an impurity into the semiconductor substrate to form semiconductor regions as a source and drain of the MISFET; (e) forming a refractory metal film over the semiconductor substrate including upper surfaces of the gate electrode and the semiconductor regions; (f) performing first heat treatment to cause a reaction between the refractory metal film and the gate electrode or the semiconductor regions to form refractory metal silicide layers; (g) after the step (f), removing the refractory metal film by a first wet cleaning, and leaving the refractory metal silicide layers over the gate electrode or the semiconductor regions; (h) after the step (g), performing second heat treatment to cause a reaction between the refractory metal silicide layers and the gate electrode or the semiconductor regions; (i) after the step (h), performing a second wet cleaning with a solution containing hydrochloric acid and aqueous hydrogen peroxide; and (j) after the step (i), forming a silicon nitride film over the semiconductor substrate including an upper surface of the refractory metal silicide layers.