Patent ID: 6362101
Filing Date: 2002-03-26
Classification: C09K,H01L

Abstract:
A chemical mechanical polishing method, comprising the steps of:providing a semiconductor wafer including a dielectric layer and a metal layer formed over at least a portion of the dielectric layer; providing at least one polishing pad for chemical mechanical polishing; providing a first slurry mixture for polishing the metal layer; polishing the metal layer using the first slurry mixture, leaving a surface of the dielectric layer exposed; providing a second slurry mixture for polishing the dielectric layer; and polishing the dielectric layer after the step of polishing the metal layer, wherein the first slurry mixture and second slurry mixture each have a pH in the range of approximately 2 to approximately 4, and wherein the first slurry mixture includes water, Fe(NO3)3, H2O2 and Al2O3.