Patent ID: 7326599

Claim:
A method for forming a structure, the method comprising the steps of: providing a substrate comprising a semiconductor material; defining an n-type metal-oxide semiconductor field-effect transistor (NMOSFET) disposed over the substrate, the NMOSFET including: a first source and a first drain defining a first channel therebetween and each of the first source and first drain comprising n-type dopants, a first gate disposed above the first channel, the first gate having a first workfunction and comprising a first metal, and a first gate dielectric layer disposed between the first gate and the first channel; and defining a p-type metal-oxide semiconductor field-effect transistor (PMOSFET) over the substrate, the PMOSFET including: a second source and a second drain, defining a second channel therebetween and each of the second source and second drain comprising p-type dopants; a second gate disposed above the second channel, the second gate having a second workfunction and comprising a second metal; and a second gate dielectric layer disposed between the second gate and the second channel, wherein the first workfunction is substantially different from the second workfunction, and at least one of the first channel and the second channel comprises a strained semiconductor channel material.