Patent ID: 8338247
Filing Date: 2012-12-25
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device including an n-channel type field effect transistor and a p-channel type field effect transistor, the method comprising the steps of: (a) preparing a semiconductor substrate; (b) forming a first gate electrode of the n-channel type field effect transistor and a second gate electrode of the p-channel type field effect transistor over the semiconductor substrate each via a gate insulating film; (c) forming an n-type first semiconductor region that functions as a source or drain of the n-channel type field effect transistor and a p-type second semiconductor region that functions as a source or drain of the p-channel type field effect transistor at the semiconductor substrate; (d) forming metal silicide layers over the first semiconductor region and over the second semiconductor region; (e) after the step (d), forming a tensile stress film over the semiconductor substrate so as to cover the first and second gate electrodes and the first and second semiconductor regions; (f) after the step (e), removing a part of the tensile stress film that covers the second gate electrode and the second semiconductor region while leaving a part of the tensile stress film that covers the first gate electrode and the first semiconductor region; and (g) after the step (f), forming a compression stress film over the semiconductor substrate so as to cover the tensile stress film, the second gate electrode and the second semiconductor region, wherein each of the metal silicide layers formed at the step (d) contains Pt, and a Pt concentration of the surface of the each of the metal silicide layers is higher than that of the inside of the each of the metal silicide layers, and wherein the Pt concentration of the surface of the metal silicide layer of the p-channel type field effect transistor is higher than the Pt concentration of the surface of the metal silicide layer of the n-channel type field effect transistor.