Patent ID: 7541281

Claim:
A method for manufacturing an electronic device, in which a via hole and a trench for an interconnect are integrally provided in an interlayer insulating film formed on a substrate, and said via hole and the trench for the interconnect are plugged with an electric conductor film, comprising: forming a via hole in said interlayer insulating film; forming a resin film on said interlayer insulating film, said resin film plugging said via hole; etching said resin film exposed outside said via hole with an etching gas containing an active oxygen species to remove a portion of said resin film formed on said insulating film; after removing said portion of said resin film, etching said resin film exposed outside said via hole with an etching gas mainly containing an active hydrogen species to form a dummy plug composed of said resin film in said via hole; forming a resist mask having an opening for an interconnect on said dummy plug and on said interlayer insulating film; etching said interlayer insulating film through said resist mask to form a trench for said interconnect, said trench being connected with said via hole, said resin remaining in said via hole; then removing said resin from said via hole; and filling said trench and said via hole with conductive material to form said interconnect.