Patent ID: 7918983

Claim:
A substrate plating method comprising: preparing a substrate having trenches or holes for use in three-dimensional packaging, the trenches or holes being formed in a surface of the substrate to be plated; performing a first electroplating process on the surface of the substrate by immersing the substrate and a first anode in a first electrolytic solution containing a plating accelerator as an additive such that the substrate and the first anode face each other, and applying a voltage between the substrate serving as a cathode and the first anode, so that a plated metal film is formed on the surface to be plated of the substrate while allowing the plating accelerator to be adsorbed onto a plating surface of the plated metal film; performing a plating accelerator removal process by immersing a cathode and the substrate with the plating surface into a second electrolytic solution containing a remover and without the plating accelerator such that the substrate and the cathode face each other, and applying a voltage between the substrate serving as an anode and the cathode, thereby removing the plating accelerator from an outer portion of the plating surface and areas of openings of the trenches or holes while leaving the plating accelerator in the deep portions of the trenches or holes; and then performing a second electroplating process on the plating surface of the plated metal film at a constant electric potential by immersing the substrate and a second anode into a third electrolytic solution without the plating accelerator such that the substrate and the second anode face each other, and applying a voltage between the substrate serving as a cathode and the second anode.