Patent ID: 7671421

Claim:
A semiconductor structure comprising: a first transistor located upon a semiconductor substrate, the first transistor comprising a first crystallographic orientation surface semiconductor layer, a first gate dielectric comprising a first dielectric material that directly contacts said first crystallographic orientation surface semiconductor layer, a first metal gate located thereupon and a first silicon gate located thereupon; and a second transistor located upon the semiconductor substrate, the second transistor comprising a second crystallographic orientation surface semiconductor layer different than the first crystallographic orientation semiconductor surface layer, a second gate dielectric comprising a second dielectric material that directly contacts said second crystallographic orientation surface semiconductor layer, wherein said second dielectric material is different from said first dielectric material, a second metal gate located thereupon and a second silicon gate located thereupon, wherein each of the first metal gate and the second metal gate comprises a metal gate material selected from the group consisting of a metal and a metal nitride.