Patent ID: 8426318
Filing Date: 2013-04-23
Classification: H01J

Abstract:
1. A method of setting a thickness of a dielectric in a substrate processing apparatus including a processing chamber in which plasma is generated; a holding stage which is disposed in the processing chamber and places a substrate thereon; an electrode facing the holding stage; and the dielectric disposed in the electrode to face the substrate placed on the holding stage, the dielectric being formed of silicon dioxide, and two high frequency powers of different frequencies being applied to the holding stage so as to etch a silicon dioxide film formed on the substrate by using the plasma, the method comprising: estimating an electric potential of the plasma facing the dielectric in a case where the dielectric is not formed in the electrode, based on the high frequency power value having a lower frequency between the two high frequency powers, and an area ratio of an anode to a cathode in the processing chamber; and setting the thickness of the dielectric so that an electric potential of the plasma, which is obtained by multiplying the estimated electric potential of the plasma by a capacity reduction coefficient calculated when a capacity of the dielectric and a capacity of a sheath generated around a surface of the dielectric are combined, is 100 eV or less.