Patent ID: 6890416
Filing Date: 2005-05-10
Classification: C25D,C25F,H05K

Abstract:
1. A method of electroplating a metal onto a substrate, in a manner reducing the likelihood of generating electrolyte species that inhibit bottom-up plating on the substrate, the method comprising: (a) providing anolyte in an anode chamber having an anode being separated from a cathode chamber by a porous transport barrier that enables migration of ionic species, including ions of the metal, across the transport barrier while substantially blocking non-ionic organic plating additives from diffusing across the transport barrier, wherein the anolyte is substantially free of the plating additives; (b) providing catholyte to the cathode chamber containing the substrate; and (c) applying a potential difference between the substrate and the anode to allow the substrate to become a cathode and plate the metal onto the substrate without allowing the concentration of plating additives in the anolyte to substantially increase.