Method for electrochemically processing a workpiece
View Patent ↗The present invention relates to a process for forming a near-planar or planar layer of a conducting material, such as copper, on a surface of a workpiece using an ECMPR technique. The process preferably uses at least two separate plating solution chemistries to form a near-planar or planar copper layer on a semiconductor substrate that has features or cavities on its surface.
1. A method of electrochemically processing a surface of a substrate, the surface being conductive and including cavities, comprising:
forming a conductive layer by depositing a conductive material from a first process solution onto the surface, wherein forming the conductive layer includes electrochemical deposition of the conductive material on the surface and electrochemical mechanical deposition of the conductive material on the surface after the electrochemical deposition, wherein the first process solution comprises a first chemical composition; and
electropolishing the conductive layer using a second process solution.
2. The method of claim 1 , wherein the second process solution comprises a second chemical composition.
3. The method of claim 1 , further comprising annealing the substrate prior to electropolishing.
4. The method of claim 1 , further comprising annealing the substrate subsequent to electropolishing.
5. The method of claim 1 , wherein forming the conductive layer is performed in a first process station of a system.
6. The method of claim 5 , wherein electropolishing is performed in a second process station of the system.
7. The method of claim 5 , wherein electropolishing is performed in the first process station after forming the conductive layer.
8. The method of claim 2 , wherein electrochemical deposition is performed in an electrochemical deposition station of a system.
9. The method of claim 8 , wherein electrochemical mechanical deposition is performed in an electrochemical mechanical deposition station of the system.
10. The method of claim 9 , wherein electropolishing is performed in an electropolishing station of the system.
11. The method of claim 1 , wherein the conductive material comprises copper.