Patent ID: 8188551

Claim:
A semiconductor device, comprising: a first transistor, the first transistor including at least two first gate electrodes, each first gate electrode adjacent a first gate dielectric, wherein each first gate electrode of the at least two first gate electrodes has a first thickness; and a second transistor proximate the first transistor, the second transistor including at least two second gate electrodes, each second gate electrode adjacent a second gate dielectric, wherein each second gate electrode of the at least two second gate electrodes has a second thickness, the second thickness being different than the first thickness, wherein a material of the first gate electrode at an interface between the first gate electrode and the first gate dielectric is the same as a material of the second gate electrode at an interface between the second gate electrode and the second gate dielectric, wherein the at least two first gate electrodes and the at least two second gate electrodes each comprise a first metallic layer and a second semiconductive layer disposed over the first metallic layer, and wherein a metallic layer of about a same thickness is disposed on the at least two first gate electrodes and the at least two second gate electrodes.