Patent ID: 6455432
Filing Date: 2002-09-24
Classification: H01L,Y10S

Abstract:
A method for removing carbon-rich particles adhered on a copper surface, said method comprising:providing a semiconductor substrate having a substructure comprising devices formed in said substrate and a metal layer formed thereon; forming a low k dielectric layer over said substrate; forming a stopping layer on said low k dielectric layer; patterning said stopping layer and said low k dielectric layer to form a plurality of via holes for interconnects; patterning said stopping layer and said low k dielectric layer to form a plurality of trenches for conductive lines; forming a conformal blanket layer above the patterned layer of said stopping layer and said low k dielectric layer as a barrier layer; forming a copper layer over said barrier layer to fill said via hole and said trench; performing a copper chemical mechanical polishing process to planarize said copper layer until said barrier layer; performing a barrier chemical mechanical polishing process to remove said barrier layer until said stopping layer; performing a chemical buffing polishing process using an acidic aqueous solution to remove said carbon-rich particles adhered on the exposed copper surface of said copper layer filled in said trench and said via hole; and performing a post chemical mechanical polishing cleaning process.