Patent ID: 7645366

Claim:
A reactor system for electrochemically treating microelectronic workpieces, comprising: a bowl configured to hold an electrochemical solution; an electrode positioned for electrical contact with the electrochemical solution and being adapted to be operatively coupled to an electrical power supply; and a workpiece holder adapted to position at least a portion of a microelectronic workpiece in contact with the electrochemical solution, the workpiece holder comprising: a contact ring comprising a rigid dielectric base, a plurality of electrical contacts, and a busbar, the base having a peripheral member and a plurality of fingers extending inwardly from the peripheral member, each of the electrical contacts being carried on a finger of the base and having an exposed contact pad adapted to electrically contact a conductive surface of a microelectronic workpiece, the busbar being carried by the peripheral member of the base, the busbar being adapted to electrically couple the electrical contacts to the electrical power supply; a workpiece support adapted to support the workpiece with respect to the contact ring; and a dielectric coating covering at least a portion of the busbar.