Patent ID: 8169040
Filing Date: 2012-05-01
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate; an n-channel MIS transistor including: a p-type semiconductor region formed on the substrate; first source and drain regions being formed in the p-type semiconductor region and being separated from each other; a first gate insulating film formed on the p-type semiconductor region between the first source and drain regions; and a first gate electrode formed on the first gate insulating film and containing Al and a first metal other than Al, the Al being distributed in the direction of the film thickness in the first gate electrode and a distribution of Al concentration having a peak in the vicinity of an interface between the first gate electrode and the first gate insulating film, the peak being lower than a maximum concentration of Al in the first gate electrode; and a p-channel MIS transistor including: an n-type semiconductor region formed on the substrate and isolated from the p-type semiconductor region; second source and drain regions being formed in the n-type semiconductor region and being separated from each other; a second gate insulating film formed on the n-type semiconductor region between the second source and drain regions; and a second gate electrode formed on the second gate insulating film and containing the first metal.