Patent ID: 7666728
Filing Date: 2010-02-23
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device having a MISFET, comprising the steps of: (a) forming a gate insulating film of the MISFET over a semiconductor substrate; (b) forming a gate electrode of the MISFET over the gate insulating film; (c) forming semiconductor regions as source and drain regions of the MISFET in the semiconductor substrate; (d) forming a refractory metal film over the semiconductor substrate including upper surfaces of the gate electrode and the semiconductor regions; (e) performing a 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; (f) after the step (e), removing an unreacted portion of the refractory metal film by a first wet cleaning; (g) after the step (f), performing a second heat treatment to cause a reaction between the refractory metal silicide layers and the gate electrode or the semiconductor regions; (h) after the step (g), performing a second wet cleaning by using a solution containing hydrochloric acid and aqueous hydrogen peroxide; (i) after the step (h), forming a first insulating film over the MISFET, wherein the first insulating film is formed by a plasma CVD method; and (j) after the step (i), forming a second insulating film over the first insulating film, wherein the second insulating film is formed by a low-pressure CVD method, and wherein the thickness of the second insulating film is larger than the thickness of the first insulating film.