Patent ID: 8829387
Filing Date: 2014-09-09
Classification: H01J

Abstract:
1. A plasma processing apparatus comprising: an evacuable processing chamber for performing therein a plasma process on a substrate; a substrate mounting table for mounting thereon the substrate within the processing chamber; a facing electrode disposed to face the substrate mounting table with a processing space provided therebetween; and a high frequency power supply for applying a high frequency power to one of the substrate mounting table and the facing electrode to generate plasma within the processing space, wherein grooves are formed at a portion of the facing electrode facing a peripheral region of the processing space, and the facing electrode is connected with a power supply for adjusting a sheath voltage within the grooves so as to control an existence region of the plasma within the grooves, wherein the grooves include an inner circular ring-shaped groove and an outer circular ring-shaped groove arranged concentrically around the inner circular ring-shaped groove, and wherein a width of the outer circular ring-shaped groove is larger than a width of the inner circular ring-shaped groove and/or a depth of the outer circular ring-shaped groove is larger than a depth of the inner circular ring-shaped groove.