Patent ID: 8361237

Claim:
A non-fluoride wet clean formulation for removal of post etch and ash residue from a Cu/low-k patterned semiconductor substrate having a CoWP feature, consisting essentially of; Deionized water; An acid selected from the group consisting of Acetic acid, Octanoic acid and mixtures thereof; Amine selected from the group consisting of triethanol amine and N-methyl monoethanol amine; Glycerol; optionally a corrosion inhibitor; wherein the formulation is compatible with the Cu/low-k pattern and the CoWP feature and (a) the molar ratio of amine to organic acid provides an approximately 4.47 to 7.50 pH and (b) the formulation has an acid content greater than 0.84 wt % and equal to or less than 2.0wt %.