Patent ID: 6297155
Filing Date: 2001-10-02
Classification: H01L

Abstract:
A method for forming a copper layer over a wafer, the method comprising the steps of:placing the wafer in an electroplating chamber, the electroplating chamber having a control system wherein the control system is electrically coupled to the wafer through at least one electrical contact that provides power to the wafer;providing a first power to the wafer at a first power level for a first time period; andpositively pulsing a second power to the wafer during a second time period following the first time period, the second power having on time periods and off time periods, and wherein: (1) a second power level that is supplied to the wafer during the on time periods of the second time period is greater than the first power level used during the first time period; and (2) a third power level that is supplied to the wafer during the off time periods of the second time period is less than the first power level used during the first time period.