Patent ID: 6746591
Filing Date: 2004-06-08
Classification: C25D,H01L

Abstract:
A method for electroplating metal into sub-quarter micron integrated circuit features, comprising:providing an electrolyte container configured to receive and maintain a fluid electrolyte therein, the electrolyte container having an anode disposed within the electrolyte container; providing a head assembly positioned above the electrolyte container, the head assembly including a wafer holder for supporting a wafer and a cathode; positioning a wafer in the electrolyte container in contact with the fluid electrolyte; and applying a varying amplitude waveform to the cathode and anode in an electroplating process, the varying amplitude waveform comprising a small magnitude voltage pulse and a large magnitude voltage pulse, the large magnitude voltage pulse generating a current density to the cathode of between about 8 milliamps per square centimeter and about 50 milliamps per square centimeter.