Patent ID: 7427362
Filing Date: 2008-09-23
Classification: C09G,H01L

Abstract:
1. A polishing solution useful for removing barrier materials in the presence of at least one nonferrous interconnect metal with limited erosion of dielectrics comprising: 0 to 20 weight percent oxidizer, at least 0.001 weight percent inhibitor for reducing removal rate of the nonferrous interconnect metals, 0.0005 to 5 weight percent of at least one nonferrous accelerator selected from the group of a complexing agent for complexing the nonferrous metal and a water-soluble copolymer containing an acrylic acid functional group and having a number average molecular weight of 100 to 1,000,000, 1 ppm to 4 weight percent organic-containing ammonium salt formed with wherein R 1 , R 2 , R 3 and R 4 are radicals, R 1 has a carbon chain length of 2 to 15 carbon atoms, 0 to 50 weight percent abrasive and balance water; and the solution having a pH of less than 7.