Patent ID: 8425977

Claim:
A method of depositing a layer of material on a substrate, comprising: providing a substrate to a substrate support pedestal disposed in an inner volume of a process chamber having one or more pump ports disposed off-center from a central axis of the substrate support pedestal, wherein the one or more pump ports provide azimuthally non uniform pumping proximate a surface of the substrate support pedestal to create localized regions of high pressure and low pressure within the inner volume, wherein the process chamber further comprises one or more gas injection funnels disposed through a ceiling of the process chamber and directly opposite the substrate support pedestal, and wherein the each gas injection funnel is offset from the central axis of the substrate support pedestal and is disposed in a region of low pressure; and providing a first process gas to the inner volume via the one or more gas injection funnels to at least partially form a layer on the substrate.