Patent ID: 7056776

Claim:
A semiconductor device having at least two different gate electrodes, the at least two different gate electrodes, comprising: a first gate electrode on a first gate insulation layer, the first gate electrode comprising a first metal-containing conductive pattern on the first gate insulation layer and a second metal-containing conductive pattern on the first metal-containing conductive pattern opposite the first gate insulation layer, the second metal-containing conductive pattern having a surface opposite the first gate insulation layer; a second gate electrode on a second gate insulation layer, the second gate electrode comprising a third metal-containing conductive pattern on the second gate insulation layer, wherein the third metal-containing conductive pattern has a surface opposite the second gate insulation layer that is substantially planar with the surface of the second metal-containing conductive pattern; and wherein the first metal-containing conductive pattern and the third metal-containing conductive pattern have different work functions from each other and wherein the second metal-containing conductive pattern and the third metal-containing conductive pattern comprise a same metal-containing conductive material.