Patent ID: 7138718

Claim:
A semiconductor device comprising: a substrate assembly; and at least one interconnect structure on said substrate assembly, said interconnect structure comprising: a first metal plug formed above and in electrical contact with said substrate assembly; a metal layer having a portion elevated above said substrate assembly and a portion defining a second metal plug formed below said elevated portion of said metal layer and in electrical contact with said first metal plug, said first and second metal plugs supporting said elevated portion of said metal layer, wherein said first and second metal plugs and said metal layer are formed of a copper containing material; a diffusion barrier layer of TiN provided over said metal layer; a bilayer adhesion promoter/diffusion barrier provided under at least one of the first and second metal plugs, said bilayer adhesion promoter/diffusion barrier formed of a group consisting of titanium/copper, chromium/copper, titanium nitride/copper, tantalum/copper, W/copper and WN/copper; a gas surrounding said first and second metal plugs; and a low-k dielectric film over said metal layer and said diffusion barrier layer of TiN.