Patent ID: 9297088
Filing Date: 2016-03-29
CPC Classification: C25D,H01L

Claim Text:
1. An electroplating method for a through-hole, the method comprising: immersing a substrate having a through-hole into a plating solution; and supplying a plating current between the substrate and anodes to perform a first plating process, a second plating process, and a third plating process successively, the anodes being arranged so as to face a front surface and a back surface of the substrate, wherein the first plating process is a plating process of forming a metal film with a uniform thickness in the through-hole to reduce a diameter of the through-hole, the plating current used in the first plating process being a PR pulsed current constituted by a forward current used in metal deposition and a reverse current used in metal dissolution which are generated alternately, the second plating process is a plating process of blocking up a central portion of the through-hole with the metal film using a PR pulsed current constituted by a forward current used in metal deposition and a reverse current used in metal dissolution which are generated alternately, a forward-current value of the PR pulsed current in the second plating process is smaller than a value of the forward current used in metal deposition in the first plating process, and the third plating process is a plating process of completely filling the through-hole with the metal film using a plating current whose value is larger than the forward-current value of the PR pulsed current used in the second plating process.