Patent ID: 8012871

Claim:
A method of manufacturing a semiconductor device, comprising: (a) forming a first insulating film over a semiconductor substrate; (b) forming a first trench in the first insulating film; (c) embedding a first metal into the first trench; (d) forming a second insulating film over the first metal and over the first insulating film; (e) forming a third insulating film over the second insulating film; (f) forming a fourth insulating film over the third insulating film; (g) forming a contact hole in the fourth, third and second insulating films; and (h) embedding a second metal into the contact hole, wherein the first insulating film comprises a first film and a second film formed on the first film, wherein the fourth insulating film has a thickness greater than thicknesses of the second and third insulating films, wherein the first metal and the second metal are composed of copper as a primary component, wherein the second insulating film is composed of a material including silicon, carbon and nitrogen, wherein the third insulating film is composed of a material including silicon and carbon, wherein the fourth insulating film is composed of a material including silicon, oxygen and carbon and has a dielectric constant lower than a dielectric constant of a silicon oxide film, and wherein a concentration of nitrogen in the second insulating film is higher than a concentration of nitrogen in the third insulating film.