Patent ID: 7332433

Claim:
A method for fabricating a dual metal gate device, comprising: providing a substrate; depositing a gate dielectric on the substrate; depositing a first metal on the gate dielectric to form a first metal layer, the first metal being selected from the group consisting of titanium nitride, tantalum nitride, tantalum carbon nitride, and tungsten; depositing a second metal on the first metal layer to form a second metal layer; etching the second metal layer to form an etched second metal layer and to expose a portion of the first metal layer; depositing a third metal layer on the exposed portion of the first metal layer and the etched second metal layer; and etching the first, second, and third metal layers to form the dual metal gate device; a first metal gate of the dual metal gate device comprising the first and third metal layers, and a second metal gate of the dual metal gate device comprising the first and second metal layers.