Patent ID: 8790521
Filing Date: 2014-07-29
Classification: C09G,H01L

Abstract:
1. A method for chemical mechanical polishing of a surface having at least one feature thereon comprising tungsten and at least one feature thereon comprising a dielectric material, said method comprising the steps of: a. placing a substrate having the surface in contact with a polishing pad; b. delivering a polishing composition comprising: c. polishing the substrate with the polishing composition wherein said periodic acid and said abrasive are present in a combined amount sufficient to render the substrate surface substantially planar and to maintain a removal rate of tungsten of at least 800 Angstroms per minute upon chemical-mechanical polishing thereof when polishing is done at 4 psi of down force ; and a tunable tungsten/dielectric selectivity ranging from 0.5 to 1.5 is realized upon chemical-mechanical polishing the substrate using the composition.