Patent ID: 7943005
Filing Date: 2011-05-17
Classification: H01J

Abstract:
1. An apparatus for plasma etching, comprising: a process chamber; a substrate support pedestal disposed in the process chamber; an RF power source for forming a plasma within the chamber; a shield disposed in the chamber above the pedestal and below a plasma forming region in the chamber, the shield configured to control a distribution of ionic and neutral species of the plasma, wherein the shield comprising two zones having at least one characteristic different from each other, the at least one characteristic being one of material or potential bias; at least one gas inlet disposed radially outward of the shield for providing a gas flow into the chamber in a direction parallel to the shield; and a deflector plate assembly disposed above the shield, the deflector plate assembly configured to provide a predetermined gas flow pattern between the gas inlet and the shield, wherein the deflector plate assembly comprises a first plate having an aperture.