Patent ID: 7468124

Claim:
A method for preventing corrosion of metal deposits in back end of the line (BEOL) structures on a wafer during wet clean rinse, the method comprising: providing a bath in which the wafer, accommodated by a wafer carrier, is immersed for cleaning, the bath having at least two leads immersed therein wherein a first of the at least two leads is in close proximity to a base of the wafer carrier accommodating the wafer and a second of the at least two leads is positioned further away from the wafer carrier in relation to the first of the at least two leads; connecting a voltage regulator to the at least two leads, wherein the voltage regulator detects a change in potential difference between the at least two leads; and regulating the change in the potential difference through the voltage regulator, wherein the voltage regulator initiates a potential-regulating-process to maintain the potential difference at a fixed constant.