Patent ID: 6830624
Filing Date: 2004-12-14
Classification: C23C,H01J

Abstract:
A gas distribution system for a substrate processing chamber, the gas distribution system comprising:a gas distribution faceplate having a first plurality of gas holes adapted to introduce a gas into the substrate processing chamber; a first gas inlet having a cross-sectional area smaller than the surface area of the substrate; a first gas passageway fluidly coupled to the first gas inlet and to the first plurality of gas holes, wherein the first gas passageway comprises a second plurality of gas holes configured to transform a flow of gas from the first gas inlet into a flow of gas having the cross-section of the surface area of the substrate; a second gas inlet; and a second gas passageway fluidly coupled to the second gas inlet and to the first plurality of gas holes, wherein the second gas passageway allows gases to flow from the second gas inlet to the first plurality of gas holes, while by-passing the second plurality of holes.