Patent ID: 6492308
Filing Date: 2002-12-10
Classification: C11D,G03F,H01L

Abstract:
A cleaning solution for cleaning a copper-containing integrated circuit after chemical-mechanical polishing during manufacturing of said integrated circuit the cleaning solution comprising:0.05 to 12.4 wt % quaternary ammonium hydroxide selected from the group consisting of tetraalkylammonium hydroxide, wherein the alkyl contains one of C1 through C10 atoms or combination of C1 through C10 atoms; 0.2 wt % to 27.8 wt % of a polar organic amine selected from the group consisting of monoethanolamine, aminoethylethanolamine, N-methylaminoethanol, aminoethoxyethanol, diethanolamine, triethanolamine, C2-C5 alkanolamines, and combinations thereof; 0.1 to 10.9 wt % of a corrosion inhibitor selected from the group consisting of ascorbic acid (Vitamin C), L(+)-ascorbic acid, isoascorbic acid, ascorbic acid derivatives, and combinations thereof, balance water; and wherein the alkalinity of the solution is greater than 0.073 milliequivalents base per gram of solution.