Patent ID: 7491252

Claim:
A chemical mechanical planarization solution useful for removing a tantalum barrier material from a semiconductor wafer comprising by weight percent 0.02 to 15 inhibitor for a nonferrous metal, 0 to 20 complexing agent for the nonferrous metal, 0.01 to 12 tantalum removal agent selected from the group consisting of formamidine, formamidine salts, formamidine derivatives, guanidine, guanidine derivatives, guanidine salts and mixtures thereof, 0 to 5 abrasive, 0 to 15 particles selected from the group consisting of polymeric particles and polymer-coated coated particles and balance water and the solution being oxidizer free, a pH greater than 5 to 12 and has a tantalum nitride to TEOS selectivity of at least 3 to 1 as measured with a microporous polyurethane polishing pad pressure measured normal to a wafer of less than 20.7 kPa.