Patent ID: 7785487

Claim:
An aqueous slurry useful for chemical mechanical polishing to remove a barrier material from a semiconductor substrate having copper interconnects comprising by weight percent, 0.01 to 25 oxidizing agent, 0.1 to 50 abrasive particles, 0.002 to 3 polyvinyl pyrrolidone, 0.01 to 10 inhibitor for decreasing static etch of the copper interconnects, 0.001 to 5 phosphate compound selected from at least one of ammonium phosphate, potassium phosphate and dipotassium phosphate for increasing removal rate of the copper interconnects, 0.0001 to 0.1 ammonium chloride for increasing removal rate of the copper interconnects, 0.001 to 10 copper complexing agent, the copper complexing agent forming with copper during polishing, and balance water; and the aqueous slurry having a pH of at least 8.