Patent ID: 6852630
Filing Date: 2005-02-08
Classification: B23H,C25F,H01L

Abstract:
1. A process for partially removing a conductive front surface of a semiconductor wafer having a conductive front surface, the process comprising the steps of: (a) positioning the conductive front surface above a cathode assembly which comprises multiple cathode members; (b) providing an etch solution that wets said cathode members and said conductive front surface; (c) connecting said multiple cathode members to multiple power sources, wherein said multiple cathode members are substantially electrically isolated from one another; (d) applying power to said cathode members from said multiple power sources; (e) positioning a mask plate between said cathode assembly and said conductive front surface of said wafer; and (f) flowing said etch solution through said mask plate so that said etch solution wets said conductive front surface.