| abstract |
Methods and apparatus for processing a substrate are provided herein. In some embodiments, a substrate processing chamber includes: a chamber body; a chamber lid assembly having a housing enclosing a central channel that extends along a central axis and has an upper portion and a lower portion; a lid plate coupled to the housing and having a contoured bottom surface that extends downwardly and outwardly from a central opening coupled to the lower portion of the central channel to a peripheral portion of the lid plate; and a gas distribution plate disposed below the lid plate and having a plurality of apertures disposed through the gas distribution plate. |