Patent ID: 8956967
Filing Date: 2015-02-17
Classification: H01L

Abstract:
1. A method of forming an interconnection structure, comprising: forming an opening in an insulation film by a dry etching process that uses an etching gas containing fluorine; cleaning a bottom surface and a sidewall surface of said opening by exposing said bottom surface and said sidewall surface of said opening to a superheated steam in an ambient of which oxygen concentration level is equal to or lower than 0.6 volumetric %; covering said bottom surface and said sidewall surface of said opening with a barrier metal film; depositing a conductor film on said insulation film and filling said opening with said conductor film via said barrier metal film; forming an interconnection pattern by said conductor film in said opening by polishing said conductor film and said barrier metal film underneath said conductor film by a chemical mechanical polishing process until a surface of said insulation film is exposed.