Patent ID: 7135776

Claim:
A semiconductor device, comprising: a semiconductor substrate; a multiple-layered insulating film provided on an upper portion of said semiconductor substrate; an electric conductor containing copper or copper alloy, said electric conductor being provided so as to extend through said multiple-layered insulating film; and an insulating film provided between said multiple-layered insulating film and said electric conductor, wherein said multiplelayered insulating film includes a first insulating layer, a second insulating layer and a third insulating layer, said second insulating layer being provided on said first insulating layer and having lower dielectric constant than the dielectric constant of said first insulating layer, said third insulating layer being provided on said second insulating layer and having higher dielectric constant than the dielectric constant of said second insulating layer, and wherein said insulating film provides an isolation of said electric conductor from an interface between said first insulating layer and said second insulating layer, and provides an isolation of said electric conductor from an interface between said second insulating layer and said third insulating layer.