Patent ID: 6651678
Filing Date: 2003-11-25
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising, sequentially:in a first etching, etching an electrode or wiring material supported by a dielectric film on a semiconductor substrate surface to expose the dielectric film; in a second etching, after at least part of the dielectric film is exposed, etching and removing etching residues of the electrode or wiring material not removed in the first etching, by etching with a first gas mixture comprising a halogen-containing gas and an additive gas suppressing etching of the dielectric film by the halogen-containing gas; and in a third etching, etching and removing etching residues remaining after the second etching by etching with a second gas mixture comprising the halogen-containing gas and the additive gas and having a larger additive gas to halogen-containing gas ratio than the first gas mixture.