Patent ID: 7579274
Filing Date: 2009-08-25
Classification: C25D,H01L

Abstract:
1. A method for electroplating copper directly onto a copper diffusion barrier layer deposited on a patterned substrate and, in the same step of the method, filling surface features of the patterned substrate with copper, said method comprising: providing an electrolytic copper bath containing, in solution in a solvent, a source of copper ions with a concentration of between 45 and 200 mM, and at least one copper complexing agent, which is an aliphatic polyamine having 2 to 4 amine functions, with a concentration of between 30 and 200 mM; a copper/complexing agent(s) molar ratio being of between 0.2 and 2; bringing said copper diffusion barrier layer of said substrate into contact with said electrolytic copper bath, applying an electrical bias to the substrate for a duration adjusted according to the thickness of copper to be electroplated, so as to electroplate copper directly onto the copper diffusion barrier layer and fill the surface features of the patterned substrate with copper, and removing the substrate from said electrolytic copper bath.