Patent ID: 6461230
Filing Date: 2002-10-08
Classification: B24B,C09G,H01L

Abstract:
A chemical-mechanical polishing method, comprising the steps of:providing a substrate having a dielectric layer thereon; forming a dual damascene opening in the dielectric layer; forming a barrier layer conformal to the dual damascene opening; forming a metallic layer over the barrier layer; performing a first chemical-mechanical polishing operation using a first slurry to remove the metallic layer to expose the barrier layer; and mixing a second slurry with a diluent to form a mixture and then carrying out a second chemical-mechanical polishing to remove the barrier layer using the mixture, wherein the diluent includes a solution of de-ionized water with benzotriazole (BTA, C6H5N3) or a solution of de-ionized water, benzotriazole (BTA, C6H5N3) and polyacrylic acid (PAA).