Patent ID: 9074287
Filing Date: 2015-07-07
Classification: C23F,C25C,H01L

Abstract:
1. A method for processing a work piece, comprising: (a) etching copper from a surface of the work piece in a wet chemical etch chamber with a peroxide-based etchant having a pH of approximately 7-11, wherein the etchant comprises an amine-based complexing agent for copper; (b) electrowinning ions of copper from the used peroxide-based etchant after it exits the wet chemical etch chamber, in an electrowinning module, wherein the electrowinning module is located downstream of the wet chemical etch chamber and comprises an electrowinning cell comprising an anode and a cathode; (c) regenerating the peroxide-based etchant by adding one or more reagents to the electrowinned peroxide-based etchant; and (d) reusing the regenerated peroxide-based etchant for wet chemical etching.