Patent ID: 7875539

Claim:
A method of manufacturing a semiconductor device comprising the steps of: preparing a semiconductor substrate; forming a plurality of gate electrodes on said semiconductor substrate; forming a first insulating film over said semiconductor substrate and said gate electrodes; forming a silicon oxynitride film over said first insulating film; forming a plurality of metal wirings on said silicon oxynitride film; forming a second insulating film formed over and between said metal wirings, wherein said silicon oxynitride film is a plane film and, said second insulating film is formed by bias-applied plasma CVD using source gas containing hydrogen atoms; and forming a plurality of contact plugs in said first insulating film and said silicon oxynitride film after forming said silicon oxynitride film and before forming said metal wirings, wherein each of said contact plugs is connected to each of said metal wirings in the step of forming said metal wirings.