Patent ID: 6635565
Filing Date: 2003-10-21
Classification: C23F,H01L

Abstract:
A method of cleaning a dual damascene structure, comprising:providing a substrate, wherein a first conductive layer is formed in a substrate; forming a dielectric layer over the substrate; forming a dual damascene opening in the dielectric layer to expose the first conductive layer, after which a polymer residue remains in the dual damascene opening; using a H2O2 based aqueous solution to oxidize the polymer residues in the dual damascene opening, wherein a temperature of the H2O2 based aqueous solution is in a in a range of about 30Â° C. to about 40Â° C. so that the first conductive layer is not corroded; cleaning the dual damascene opening with a diluted HF solution or a diluted HF and HCl solution; forming a second conductive layer over the substrate to fill the dual damascene opening; performing a chemical mechanical polishing process to remove the second conductive layer outside the dual damascene opening, wherein a dual damascene structure is formed; using a H2O2 based aqueous solution to clean the dual damascene structure and controlling a temperature of a H2O2 based aqueous solution so that the dual damascene structure is not overly corroded; and cleaning the dual damascene structure with a diluted HF solution or a diluted HF and HCl solution.