Patent ID: 7767581

Claim:
A method for polishing tantalum-containing barrier materials of a semiconductor substrate with a polishing fluid including the step of polishing the semiconductor substrate with the polishing fluid polishing to remove at least a portion of the tantalum-containing barrier layer, the polishing fluid comprising: a nitrogen-containing compound having at least two nitrogen atoms comprising at least one of a compound of a formula selected from the group comprising: wherein R 1 comprises —H or —NH 2 and R 2 , 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 polishing fluid being capable of removing the tantalum-containing barrier materials from a surface of the semiconductor substrate without an abrasive.