Patent ID: 7060618

Claim:
A method for manufacturing a semiconductor device, comprising: providing an insulating film having recesses therein which are partially filled by a seed layer that covers a surface of said insulating film; plating an electrically conductive material onto said seed layer so as to embed said electrically conductive material in said recesses; removing said electrically conductive material and said seed layer from said surface of said insulating film, whereby interconnects of said electrically conductive material are formed in said insulating film; cleaning said surface of said insulating film with a cleaning liquid containing an alkaline surfactant to reduce an electrical conductor contamination on said insulating film; electroless plating a material onto exposed surfaces of said interconnects, thereby selectively forming a protective film on said exposed surfaces; and flattening a surface of said protective film to eliminate unevenness of a thickness of said protective film and to remove an overhanging portion of said protective film.