Patent ID: 8269285

Claim:
A semiconductor device, comprising: a semiconductor substrate having a first semiconductor layer and a second semiconductor layer separated from each other; an nMIS transistor including a first source region and a first drain region, which regions are formed in the first semiconductor layer and separated from each other, a first gate dielectric film covering a first channel region which is the first semiconductor layer between the first source region and the first drain region, a first gate electrode formed on the first gate dielectric film and including an Hf oxide film or a Zr oxide film in which Mo is added, and a first element selected from a first group consisting of F, H and Ta is added; and a pMIS transistor including a second source region and a second drain region, which regions are formed in the second semiconductor layer and separated from each other, a second gate dielectric film covering a second channel region which is the second semiconductor layer between the second source region and the second drain region, and a second gate electrode formed on the second gate dielectric film and including an Hf oxide film or a Zr oxide film in which Mo is added, and a second element selected from a second group consisting of N, C, B, Mg, Ca, Sr, Ba, Al, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu is added.