Patent ID: 8900371

Claim:
A cleaning method for a surface of a semiconductor substrate, which comprises the steps of: chemical mechanical polishing the surface of the semiconductor substrate on which copper wiring is provided with a slurry containing benzotriazole or a derivative thereof, treating the surface of the semiconductor substrate with a cleaning agent after the polishing step, wherein the cleaning agent consists essentially of [I] an organic acid having at least one carboxyl group, [II] a complexing agent having at least one phosphonic acid group in a molecule selected from the group consisting of (1)nitrogen-containing polyphosphonic acids having 1 to 6 nitrogen atoms and 1 to 8 phosphonic acid groups in a molecule, (2) aryl polyphosphonic acids, (3) alkylene polyphosphonic acids, (4) alkane polyphosphonic acids which may have a hydroxyl group, and (5) ammonium salt or an alkali metal salt thereof, [III] at least one organic solvent selected from the group consisting of (1) monohydric alcohols, (2) alkoxyalcohols, (3) glycols, (4) glycol ethers, (5) ketones and (6) nitriles, and [IV] water; wherein the cleaning agent does not contain hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid and hydrofluoric acid; and wherein the total concentration of the organic solvent(s) in the cleaning agent is 0.05 to 40% by weight; and pH of the cleaning agent is 0.5 to 6.5.