Patent ID: 6458262
Filing Date: 2002-10-01
Classification: C25D

Abstract:
A method for monitoring and controlling an electroplating process, the method comprising:(a) obtaining a sample of electrolyte, comprising an acid, a metal salt, and one or more organic components, from the electroplating process; (b) removing an organic fraction of the sample of electrolyte to give a substantially organic-free electrolyte sample; (c) determining the density of the substantially organic-free electrolyte sample; (d) determining at least one of the conductivity and the light absorption of the substantially organic-free electrolyte sample; (e) comparing at least one of the conductivity and the light absorption measurement of the substantially organic-free electrolyte sample with the density in order to determine a concentration value for each of the metal salt and the acid; and (f) adjusting conditions of the electroplating process in response to a comparison of the concentration value for each of the metal salt and the acid, with an associated target value.