Patent ID: 7241360
Filing Date: 2007-07-10
Classification: C23C,H01J

Abstract:
1. An apparatus for treating a substrate, comprising: a) a vacuum chamber; b) an ion source disposed in the vacuum chamber, the ion source comprising a cathode having a magnetic gap and an anode adjacent to the magnetic gap; c) a first power supply connection that applies a positive voltage to the anode during a first portion of an AC power cycle and a negative voltage to the anode during a second portion of the AC power cycle, the positive voltage causing the anode to emit ions that strike a substrate disposed in the vacuum chamber; and d) a second power supply connection that applies a negative voltage to the cathode during a second portion of the AC power cycle, the negative voltages applied to the anode and cathode causing the ion source to emit electrons that strike the substrate, thereby neutralizing positive charges on the substrate.