Patent ID: 8729633

Claim:
A CMOS semiconductor device comprising: a first field effect transistor formed in a first region of a workpiece, the first field effect transistor comprising: a first source and a first drain disposed in the workpiece, a first channel region disposed between the first source and the first drain, a first gate dielectric comprising hafnium oxide disposed over the first channel region, and a first gate comprising titanium nitride disposed over the first gate dielectric; and a second field effect transistor formed in a second region of the workpiece, the second field effect transistor comprising: a second source and a second drain disposed in the workpiece, a second channel region disposed between the second source and the second drain, a second gate dielectric comprising hafnium oxide disposed over the second channel region, and a second gate comprising titanium nitride disposed over the second gate dielectric, the second gate being doped with aluminum.