Patent ID: 8992756
Filing Date: 2015-03-31
Classification: C23C,C25D,H05K

Abstract:
1. A direct plating process for applying copper electroplating to an insulating part of a workpiece having said insulating part and a copper part at a surface of the workpiece comprising the steps of: subjecting the surface of said workpiece to palladium catalyst treatment so as to apply a palladium catalyst onto the insulating part; forming a palladium conductor layer on the palladium catalyst on said insulating part of said workpiece by treating the surface having said insulating part and copper part with a palladium conductor layer forming solution, which comprises a palladium compound, an amine compound, a reducing agent and an azole compound, while using the palladium catalyst; and then electroplating a copper film directly on said palladium conductor layer, wherein said azole compound is selected from the group consisting of an imidazole compound, a triazole compound, a tetrazole compound and a pyrazole compound, said reducing agent is selected from the group consisting of hypophosphorous acid and its salts, boron hydride and its salts, dimethylamineboran, and trimethylamineboran, and the azole compound is adsorbed to the copper part of said workpiece and inhibits a substitution reaction of palladium onto the copper part of said workpiece in the forming step so that the palladium conductor layer is selectively formed on only the palladium catalyst on said insulating part of said workpiece without forming a palladium conductor layer on said copper part of said workpiece.