Patent ID: 6761814
Filing Date: 2004-07-13
Classification: C25D,H01L,H05K

Abstract:
A method of filling vias on a substrate comprising contacting the substrate with a metal electroplating bath and applying sufficient current density to the metal electroplating bath to deposit a desired metal layer to fill the vias without voids, wherein the current density is applied in a first cycle comprising a forward current density (F) for 1 to 50 msec, a reverse current density (R) for 0.2 to 5 msec, and a rest interval, where a ratio of F/R is from 1/1 to 1/10 and a second cycle comprising a second forward current density (F2) for 1 to 50 msec and a second reverse current density (R2) for 0.2 to 5 msec where a ratio of F2/R2 for the second cycle is from 1/1 to 1/0.1.