Patent ID: 7572337
Filing Date: 2009-08-11
Classification: C23C,H01J

Abstract:
1. An apparatus for distributing gases into a processing chamber, comprising: a gas distribution plate in the chamber, wherein the gas distribution plate has a plurality of apertures disposed therethrough; and a blocker plate spaced above the gas distribution plate, wherein the blocker plate has a plurality of apertures disposed therethrough and feed through passages extending through a center region of the blocker plate; wherein a first gas pathway is configured to deliver a first gas sequentially through the apertures of both the blocker plate and the gas distribution plate; and wherein a second gas pathway is configured to deliver a second gas (i) around the blocker plate and through the apertures of the gas distribution plate without passing through the blocker plate, and (ii) through the feed through passages extending through a center region of the blocker plate and through the apertures of the gas distribution plate, without mixing first and second gases prior to the first gas passing through the apertures of the blocker plate.