Patent ID: 8133362

Claim:
A physical vapor deposition apparatus, comprising: a vacuum chamber having side walls; a cathode inside the vacuum chamber, wherein the cathode is configured to include a sputtering target; a radio frequency power supply configured to apply power to the cathode; an anode inside and electrically connected to the side walls of the vacuum chamber; a chuck inside and electrically isolated from the side walls of the vacuum chamber, the chuck configured to support a substrate; a clamp configured to hold the substrate to the chuck, wherein the clamp is electrically conductive; and a plurality of conductive electrodes, each electrode of the plurality of conductive electrodes having a first end attached to the clamp and an unattached second end, each electrode configured to compress when contacted by the substrate, and when contacted by the substrate, the unattached second end of at least one of the conductive electrodes is pressed against the clamp.