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 establishing electrical contact to a surface of a semiconductor workpiece for processing the surface, comprising:
providing a pad assembly including a pad and a pad support, the pad facing and proximate to the surface;
touching the surface with at least one contact protruding through the pad; and
maintaining relative motion between the surface and the at least one contact to process the surface.
2. The method of claim 1 , wherein the processing includes electroprocessing and further comprises the step of removing material from the surface.
3. The method of claim 2 , wherein the step of removing includes placing the pad proximate to the surface.
4. The method of claim 2 , wherein the step of removing includes touching the surface with the pad.
5. The method of claim 4 , wherein the step of touching the surface with the pad includes polishing the surface with the pad.
6. The method of claim 2 , wherein the pad includes a plurality of contacts and the step of touching the surface includes touching the surface with the plurality of contacts at a plurality of locations.
7. The method of claim 1 , wherein the area of the pad is smaller than the area of the surface of the semiconductor workpiece.
8. The method of claim 1 , wherein the area of the pad is larger than the area of the surface of the semiconductor workpiece.
9. The method of claim 1 , wherein the processing includes electroprocessing and further comprises the step of depositing material onto the surface.
10. The method of claim 9 , wherein the step of depositing includes placing the pad proximate to the surface.
11. The method of claim 9 , wherein the step of depositing includes touching the surface with the pad.
12. The method of claim 11 , wherein the step of touching the surface with the pad includes polishing the surface with the pad.
13. The method of claim 9 , wherein the pad includes a plurality of contacts and the step of touching the surface includes touching the surface with the plurality of contacts at a plurality of locations.
14. The method of claim 1 , wherein the pad support comprises an anode.