Patent ID: 8779530

Claim:
A gate for a Field Effect Transistor comprising: a trench; and a gate electrode, the gate electrode comprising: a lower portion of the gate electrode filling a width of a bottom portion of the trench, the lower portion formed of a first metal material and having a recess and a first resistance, wherein the lower portion having a maximum height ranging from 300 to 2900 angstroms; and an upper portion of the gate electrode filling substantially an entire width of a top portion of the trench, the upper portion formed of a homogeneous second metal material and having a protrusion and a second resistance, wherein the protrusion extends into the recess and has a thickness ranging from 150 angstroms to 2870 angstroms, wherein the second resistance is lower than the first resistance, and a maximum width of the upper portion of the gate electrode is substantially equal to a maximum width of the lower portion of the gate electrode; and a gate dielectric layer surrounding the gate electrode, wherein a top surface of the gate dielectric layer is substantially co-planar with a top surface of the homogeneous second metal material.