Patent ID: 7270597
Filing Date: 2007-09-18
Classification: B24B

Abstract:
1. A method for cleaning a chemical mechanical polishing (CMP) pad after performing a CMP operation on a wafer, the CMP pad having a residue on a surface of the CMP pad, the method comprising: applying chemicals onto the surface of the CMP pad; rinsing the pad surface to substantially remove by-product produced by the chemicals; and performing a mechanical conditioning operation on the surface of the pad, wherein during the CMP operation the wafer surface includes copper and oxide wherein when the wafer surface contains more copper than the oxide, the chemicals are selected from one or a combination of: (a) ammonium chloride (NH (b) ammonium persulfate ((NH (c) CuCl (d) citric acid (C (e) NH (f) ammonium citrate ((NH (g) HCl; (h) hydrofluoric acid (HF); (i) Tetramethylammonium hydroxide (TMAH); (j) SCl; (k) chelating agents; and (l) surfactants.