Patent ID: 7850836
Filing Date: 2010-12-14
Classification: C25D,H01L

Abstract:
1. A method of electro-depositing a conductive material in at least one through-hole via of a semiconductor substrate, said through-hole via having an effective aspect ratio, said method comprising: supplying an initial pulse current cycle to the via, said pulse current cycle comprising: measuring a remaining unfilled depth of the via after the initial pulse current cycle to determine the reduced effective aspect ratio of the via; supplying a first subsequent pulse current cycle to the via wherein the magnitude of the forward and reverse pulse currents of the first subsequent pulse current cycle are varied in relation to the reduced effective aspect ratio; measuring the remaining unfilled depth of the via after the first subsequent pulse current cycle to determine the further reduced effective aspect ration of the via; and supplying a second subsequent pulse current cycle to the via, wherein the magnitude of the forward and reverse pulse currents of the second subsequent pulse current cycle are varied in relation to the further reduced effective aspect ratio.