Patent ID: 6217735
Filing Date: 2001-04-17
Classification: C25D

Abstract:
A method of electroplating a face of a flat substrate with an electroplating bath that includes an elongated horizontally extending tray having an open top, an elongated horizontally extending megasonic transducer at a base of said tray, an anode extending horizontally above said transducer; and sparger means supplying an electrolyte into said tray so that the megasonic transducer creates a transverse ridge of said electrolyte in said tray that can contact a substrate passing above the open top of said tray; the method comprisingapplying megasonic energy to said transducer to create said transverse ridge of said electrolyte;orienting said substrate horizontally and face down so that said transverse ridge contacts the face of said substrate;effecting relative motion as between said substrate and said tray so that said ridge sweeps across the face of said substrate in a direction substantially across said transverse ridge; andapplying plating current between said anode and said substrate.