Patent ID: 6171952
Filing Date: 2001-01-09
Classification: H01L

Abstract:
A method of forming a metallization layer, comprising:forming a first layer overlying a substrate;forming a second layer overlying the first layer;selectively removing a portion of the second layer to leave a remaining portion of the second layer and to expose a portion of the first layer;producing a first surface potential on the first layer and a second surface potential on the second layer, wherein the second surface potential is higher than the first surface potential;applying a first voltage between the substrate and an anode in the presence of an electrolytic bath containing metal ions, wherein a potential difference between the first voltage and the first surface potential exceeds a reduction potential of the metal, thereby depositing the metal on the exposed portion of the first layer and the remaining portion of the second layer; andapplying a second voltage between the substrate and the anode in the presence of the electrolytic bath containing the metal ions, wherein a potential difference between the second voltage and the first surface potential is less than a reverse deposition potential of the metal, thereby removing the metal from the exposed portion of the first layer.