Patent ID: 7671442

Claim:
A structure, comprising: a dielectric layer on a substrate; a capping layer formed on a top surface of said dielectric layer; a damascene or dual damascene wire extending below said top surface of said dielectric layer, a top surface of said damascene or dual damascene wire coplanar with a top surface of said capping layer; a first air-gap having a first side defined by a first region of sidewalls of said a damascene or dual damascene wire, a second side defined by sidewalls of said capping layer and a top defined by a bottom surface of a sealing layer, said sealing layer on said top surface of said damascene or dual damascene wire and said top surface of said capping layer, said sealing layer bridging across and sealing a top of said first air-gap; and a second air-gap having a first side defined by a second region of said sidewalls of said damascene or dual damascene wire and having a second side defined by a sidewall of said dielectric layer, a bottom of said first air-gap open to a top of said second air gap.