Patent ID: 8912134

Claim:
A method of cleaning copper material surfaces in ultra large scale integrated circuits after polishing, comprising: a) mixing and stirring between 1 and 4 wt. % of a surfactant, between 0.5 and 3 wt. % of a chelating agent, between 0.1 and 5 wt. % of a corrosion inhibitor, and deionized water, to yield a water soluble cleaning solution with pH value of between 7.4 and 8.2, the wt. % being expressed based on the total weight of the cleaning solution; and b) washing the copper material surfaces using the cleaning solution after alkaline chemical-mechanical polishing under following conditions: pressure: between 2000 and 3000 Pa; flow rate: between 1000 and 5000 mL/min; and washing time: at least between 0.5 and 2 min.