Patent ID: 9038566
Filing Date: 2015-05-26
Classification: H01J

Abstract:
1. A capacitive coupling plasma processing apparatus comprising: a process chamber configured to have a vacuum atmosphere; a process gas supply section configured to supply a process gas into the chamber; a lower electrode disposed in the chamber and configured to support a target substrate thereon; an upper electrode disposed opposite the lower electrode in the chamber, and including a plurality of conductive segments separated from each other and facing the lower electrode; a radio frequency (RF) power supply connected to the lower electrode to apply an RF power to the lower electrode to form an RF electric field within a plasma generation region between the lower and upper electrodes, so as to turn the process gas into plasma by the RF electric field; and a direct current (DC) power supply configured to apply a DC voltage to at least one of the segments of the upper electrode, wherein the segments include an inner segment and an outer segment disposed around and separated from the inner segment, the DC power supply being configured to apply the DC voltage to a least one of the inner and outer segments, and the segments further include a middle segment disposed between and separated from the inner segment and the outer segment, the middle segment being configured to be selectively supplied with a DC voltage, wherein the inner, middle, and outer segments are concentrically disposed, wherein the upper electrode further includes a grounded conductive common base, and the inner, middle, and outer segments are supported side by side by the common base through a planate insulating film such that the inner, middle, and outer segments face the lower electrode, and wherein the common base has a gas diffusion space formed therein to receive the process gas, and a plurality of gas delivery holes are formed in the common base, the insulating film, and the segments to derive the process gas from the gas diffusion space to the plasma generation region.