Patent ID: 7232513

Claim:
An electroplating solution, comprising: copper metal ions; sulfuric acid at a concentration of about 10 grams per liter; chloride ions at a concentration of about 50 milligrams per liter; an accelerator at a concentration of about 30 parts per million (ppm), said accelerator consisting essentially of bis-(3-sulfopropyl)-disulfide (SPS); a leveler at a concentration of about 2 ppm, said leveler consisting essentially of poly(vinyl pyrrolidone) (PVP) having an average molecular weight in a range of about from 3000 to 5000; a suppressor at a concentration of about 200 ppm; and a wetting agent at a concentration in a range of about from 80 ppm to 200 ppm; wherein said suppressor consists essentially of a formulation having an average molecular weight of about 2500 and a molar ratio of polypropylene glycol (PPG) to polyethylene glycol (PEG) of about 0.5; and said wetting agent consists essentially of a block co-polymer of polyethylene glycol and polypropylene glycol having an average molecular weight of about 5900 and a molar ratio of polyethylene glycol (PEG) to polypropylene glycol (PPG) of about 0.4:0.6.