Patent ID: 7241725

Claim:
A polishing fluid useful for polishing tantalum-containing barrier materials of a semiconductor substrate, the semiconductor having a copper or copper alloy interconnect, comprising, by weight percent: 0.1 to 10 nitrogen-containing compound having at least two nitrogen atoms comprising at least one of a compound of a formula selected from the group comprising: imine compounds and hydrazine compounds R 3 R 4 N—N R 5 R 6 (II), wherein R 3 , R 4 , R 5 and R 6 independently comprise substituents selected from the group consisting of —H, a hydrocarbon group, an amino group, a carbonyl group, an imido group, an azo group, a cyano group, a thio group, a seleno group and —OR 7 where R 7 comprises a hydrocarbon group, and the nitrogen-containing compound being free of electron-withdrawing substituents and the imine compound includes either guanidine or formamidine; and 0.0025 to 2 benzotriazole; and the polishing fluid having a pH of 8 to 11, containing no abrasive particles and being capable of removing the tantalum-containing barrier materials from a surface of the semiconductor substrate.