Device providing electrical contact to the surface of a semiconductor workpiece during processing
View Patent ↗Substantially uniform deposition of conductive material on a surface of a substrate, which substrate includes a semiconductor wafer, from an electrolyte containing the conductive material can be provided by way of a particular device which includes first and second conductive elements. The first conductive element can have multiple electrical contacts, of identical or different configurations, or may be in the form of a conductive pad, and can contact or otherwise electrically interconnect with the substrate surface over substantially all of the substrate surface. Upon application of a potential between the first and second conductive elements while the electrolyte makes physical contact with the substrate surface and the second conductive element, the conductive material is deposited on the substrate surface. It is possible to reverse the polarity of the voltage applied between the anode and the cathode so that electro-etching of deposited conductive material can be performed.
1. A method of electropolishing a conductive surface of a workpiece, the method comprising:
bringing the conductive surface to contact with an electro-etching electrolyte delivered to a substantially planar polishing pad supported by a substantially planar support structure, the polishing pad having at least one conductive portion configured to contact the conductive surface; and
electropolishing the conductive surface with a polishing surface of the polishing pad while the at least one conductive portion is touching the conductive surface and conducting electricity to the conductive surface.
2. The method of claim 1 , further comprising flowing the electro-etching electrolyte through at least one opening formed through the polishing pad.
3. The method of claim 1 , further comprising establishing a relative motion between the polishing pad and the conductive surface of the workpiece.
4. The method of claim 1 , wherein electropolishing comprises applying a potential difference between the at least one conductive portion and an electrode placed in the electro-etching electrolyte.
5. A method of electropolishing a conductive surface of a workpiece, the method comprising:
bringing the conductive surface to contact with an electro-etching electrolyte delivered to a substantially planar conductive pad including a polishing surface, the polishing surface being entirely conductive the pad supported by a substantially planar suppot structure ; and
electropolishing the conductive surface with the polishing surface of the conductive pad while touching the conductive surface with the polishing surface and conducting electricity to the conductive surface through the polishing surface of the conductive pad.
6. The method of claim 5 , wherein the conductive pad includes at least one opening formed therethrough, the method further comprising flowing the electro-etching electrolyte through the opening.
7. The method of claim 5 , further comprising establishing a relative motion between the conductive pad and the conductive surface of the workpiece.
8. The method of claim 5 , wherein electropolishing includes applying a potential between the conductive pad and an electrode in the solution.