Patent ID: 7442273
Filing Date: 2008-10-28
Classification: H01J

Abstract:
1. A hybrid coupled plasma type apparatus, comprising: a chamber having a gas-injecting unit; an electrostatic chuck in the chamber; an insulating plate over the gas-injecting unit; a high frequency generator; an impedance matching circuit connected to the high frequency generator; first and second antennas that are concentric ring shaped and connected to the impedance matching circuit in parallel, a power of the high frequency generator being supplied to the first and second antennas; an electrode of a plate shape disposed above the first and second antennas and connected to one of the first and second antennas in serial, the power of the high frequency generator being supplied to the electrode; and a variable capacitor as a power distributor connected between the impedance matching circuit and one of the first and second antennas and controlling a current between the high frequency generator and one of the first and second antennas and between the high frequency generator and the electrode, wherein the variable capacitor controls the current to select one of an ICP type and a CCP type for forming a plasma from reaction gases in the chamber.