Patent ID: 6248660
Filing Date: 2001-06-19
Classification: H01L

Abstract:
A method of forming a metallic plug for a semiconductor device, comprising:depositing an insulating layer on a substrate;forming a plurality of openings sparsely in some regions and densely in other regions in the insulating layer;depositing an adhesive layer on a surface of the insulating film including the plurality of openings;depositing a filling film on a surface of the adhesive layer including the plurality of openings so that height of the filling film is equal to or higher than the surface of the insulating film directly before the openings have been formed;dry etching the filling film so that a part of the filling film remains at portions where the openings have not been formed and the whole surface of the filling film is flattened; andeliminating the remaining filling film at the portions where the openings have not been formed and the adhesive layer under the filling film overall by polishing using a slurry for polishing a metal after the dry etching so that the filling film has substantially uniform thickness in the openings regardless of whether the plurality of openings are formed sparsely or densely.