Patent ID: 6977228

Claim:
A method of manufacturing a semiconductor device comprising: forming a gate insulation film on a semiconductor substrate; forming, on said gate insulation film, gate electrodes formed by a first conductive film; forming, on said semiconductor substrate, source/drain diffusion layers; forming, on a side wall of said gate electrodes, a spacer formed by a first insulation film; forming a second insulation film on the overall surface and etching back said second insulation film to the same height as said gate electrodes so that the surface is flattened; etching said gate electrodes in the direction of the depth thereof to have a predetermined thickness so as to form a first stepped portion from said first insulation film; filling up said first stepped portion by a second conductive film; etching said second conductive film in the direction of the depth thereof to have a predetermined thickness so as to form a second stepped portion from said first insulation film; and filling up said second stepped portion by a third insulation film.