Patent ID: 8197660

Claim:
A method of fabricating an integrated circuit, the method comprising: placing a workpiece under a workpiece holder, the workpiece holder disposed in a electro chemical deposition chamber and connected to a cathode electrode, the electro chemical deposition chamber further comprising a bottom electrode and at least one auxiliary electrode comprising a plurality of openings, the at least one auxiliary electrode disposed between the workpiece and the bottom electrode, wherein the at least one auxiliary electrode has a convex shape such that a first nearest distance is less than a second nearest distance and a third nearest distance is more than a fourth nearest distance, wherein the first nearest distance is the nearest distance from a center portion of the at least one auxiliary electrode to the workpiece, wherein the second nearest distance is the nearest distance from an edge portion of the at least one auxiliary electrode to the workpiece, wherein the third nearest distance is the nearest distance from the center portion of the at least one auxiliary electrode to the bottom electrode, and wherein the fourth nearest distance is the nearest distance from the edge portion of the at least one auxiliary electrode to the bottom electrode; flowing an electrolyte comprising ionized atoms into the electro chemical deposition chamber, wherein the electro chemical deposition chamber comprises a diffuser configured to control the flow of the electrolyte and electric field lines in the electro chemical deposition chamber, and wherein the diffuser is disposed between the at least one auxiliary electrode and the bottom electrode, wherein the diffuser is separated physically from the at least one auxiliary electrode by a portion of the electrolyte; and powering the cathode electrode, the bottom electrode and the at least one auxiliary electrode, whereby the ionized atoms deposit over the workpiece, wherein the at least one auxiliary electrode is consumed when the ionized atoms deposit over the workpiece.