Patent ID: 8951908
Filing Date: 2015-02-10
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: preparing a structure comprising a substrate, an interlayer insulating layer formed on the substrate and having a recessed portion, a barrier film formed on the interlayer insulating layer, and a copper film formed on the barrier film such that the copper film is filling the recessed portion of the interlayer insulating layer with the barrier film interposed between the interlayer insulating layer and the copper film; removing the copper film of the structure by chemical mechanical polishing down to an interface with the barrier film such that a copper wiring is formed in the recessed portion of the interlayer insulating layer; etching the copper wiring such that a surface of the copper wiring is recessed from a surface of the interlayer insulating layer; and removing the barrier film by chemical mechanical polishing from the surface of the interlayer insulating layer such that the surface of the interlayer insulating layer is exposed, wherein the etching of the copper wiring includes positioning in an organic compound atmosphere having a vacuum state and including an organic compound the structure removed down to the barrier film, and irradiating an oxygen gas cluster ion beam on the surface of the copper wiring of the structure such that the copper wiring is anisotropically etched, wherein the etching of the copper includes supplying the organic compound in a supply amount such that the structure is not heated to promote adhesion of molecule of the organic compound to the surface of the copper wiring and that the organic compound atmosphere has a degree of vacuum in which the molecule of the organic compound does not interfere with the oxygen gas cluster ion beam.