Patent ID: 8858774
Filing Date: 2014-10-14
Classification: C25D,H01L

Abstract:
1. An electroplating apparatus for electroplating a metal on a substrate, the apparatus comprising: (a) a plating chamber configured to contain an electrolyte, and an anode; (b) a substrate holder configured to hold the substrate; (c) an auxiliary azimuthally asymmetric electrode housed in a separate chamber, wherein an exposure of plating current from the auxiliary electrode is through at least one channel that delivers current into a region of the plating chamber near the periphery of the substrate over an arc angle of less than about 120 degrees and (d) a controller comprising program instructions for electroplating the metal on the substrate while rotating the substrate, and while providing power to the auxiliary azimuthally asymmetric electrode in correlation with the rotation of the substrate, such that the auxiliary azimuthally asymmetric electrode donates plating current to a first portion of the substrate at a selected azimuthal position of the substrate differently than to a second portion of the substrate having the same average arc length and the same average radial position and residing at a different angular azimuthal position.