Patent ID: 8329540
Filing Date: 2012-12-11
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming a first gate insulation film over a first device forming region disposed in a substrate; forming a lower gate electrode film comprising a metal nitride film over the first gate insulation film; performing a heat treatment to the lower gate electrode film; forming an upper gate electrode film over the lower gate electrode film; forming a second gate insulation film over a second device forming region disposed in the substrate before the step of forming the lower gate electrode film, wherein said forming the lower gate electrode film includes forming the lower gate electrode film also over the second gate insulation film; and forming a mask film over the lower gate electrode film situated over the second gate insulation film between said forming the lower gate electrode film and said performing a heat treatment to the lower gate electrode film, wherein said forming the upper gate electrode film includes forming the upper gate electrode film also over the lower gate electrode film situated over the second gate insulation film.