Patent ID: 8188532

Claim:
A semiconductor device, comprising: a semiconductor substrate including a first region and a second region; a first gate structure on the first region, the first gate structure including a polysilicon layer and a first top metal layer; a first middle conductive layer between the first top metal layer and the polysilicon layer; a second gate structure on the second region, the second gate structure including a bottom conductive layer and a second top metal layer; a second middle conductive layer between the second top metal layer and the bottom conductive layer; a first contact plug connected directly with the polysilicon layer of the first gate structure; and a second contact plug connected directly with the second top metal layer of the second gate structure, wherein the first contact plug is spaced apart from the first top metal layer the bottom conductive layer is made of at least one metal nitride, and the first middle conductive layer and the second middle conductive layer are made of at least one metal nitride, conductive metal oxide, metal silicide, or metal nitride including at least one of silicon or aluminum.