Patent ID: 6699299
Filing Date: 2004-03-02
Classification: C09G,H01L

Abstract:
A method for chemical/mechanical planarization, of a semiconductor substrate having silicon dioxide underlying a layer of metal, the layer of metal to be removed by chemical/mechanical planarization, comprising the steps of:applying an aqueous solution to a polishing pad during relative movement between the substrate and the polishing pad, with the substrate and the polishing pad pressing against each other to remove the layer of metal, the aqueous solution containing an organic polymer dissolved in the aqueous solution, oxidizing the metal with an oxidant in the aqueous solution to produce ions of the metal, increasing solubility of the ions in the aqueous solution by complexing the ions with a complexing agent in the aqueous solution, and inhibiting removal of the silicon dioxide during removal of the layer of metal by bonding the organic polymer with silanol surface groups on the silicon dioxide.