Patent ID: 8481118

Claim:
A method for chemical vapor deposition using a showerhead, comprising: flowing a first gas and second gas into a showerhead having: a first plenum disposed within the showerhead; a second plenum disposed within the showerhead; a plurality of first gas flow channels formed within the showerhead and in fluid communication with the first plenum; a plurality of second gas flow channels formed within the showerhead and in fluid communication with the second plenum, wherein the first plenum is disposed between the second plenum and the first and second gas flow channels; a first plurality of gas conduits formed within the showerhead and coupling the first plenum to the first gas flow channels; a second plurality of gas conduits formed within the showerhead and coupling the second plenum to the second gas flow channels; a plurality of first gas injection holes formed within the showerhead and in fluid communication with the first gas flow channels; and a plurality of second gas injection holes formed within the showerhead and in fluid communication with the second gas flow channels; flowing the first gas into the first plenum and from the first plenum through the first plurality of gas conduits into the plurality of first gas flow channels; and flowing the second gas into the second plenum and from the second plenum through the second plurality of gas conduits into the plurality of second gas flow channels.