Patent ID: 7915111

Claim:
A method of manufacturing first and second semiconductor devices, comprising: forming a first semiconductor device by: forming first spacers over a substrate; and forming a first gate electrode located over the substrate and laterally between the first spacers by: forming a first metal layer between the first spacers and defining a first trench; and forming a second metal layer completely filling the first trench, wherein the first and second metal layers have substantially different metallic compositions; and forming a second semiconductor device by: forming second spacers over the substrate; and forming a second gate electrode located over the substrate and laterally between the second spacers by: forming a third metal layer between the second spacers and defining a second trench; and forming a fourth metal layer completely filling the second trench, wherein the third and fourth metal layers have substantially different metallic compositions and the first and third metal layers have substantially different metallic compositions; wherein the second and third metal layers have substantially the same composition and are formed substantially simultaneously.