Patent ID: 8786028

Claim:
A semiconductor device comprising: a substrate; a gate metal layer; a first FIN field effect transistor (FINFET) comprising: a first source at the substrate; a first drain at the substrate; a first channel at the substrate, the first channel being interposed between the first source and the first drain; a first gate comprising a first portion of the gate metal layer, the first portion of the gate metal comprising a first gate material; and a first gate oxide interposed between the first gate and the first channel; and a second FINFET comprising: a second source at the substrate; a second drain at the substrate; a second channel at the substrate, the second channel being interposed between the second source and the second drain; a second gate comprising a second portion of the gate metal layer, the second portion of the gate metal comprising a second gate material; and a second gate oxide interposed between the second gate and the second channel; wherein the first gate material comprises first dopants causing the first gate material to have a first work function, wherein the second gate material has a second work function different from the first work function, and wherein the first FINFET and the second FINFET are of the same conductivity type.