US Patent 10130958 Showerhead assembly with gas injection distribution devices

A method and apparatus that may be utilized for chemical vapor deposition and/or hydride vapor phase epitaxial (HVPE) deposition are provided. The apparatus includes a showerhead assembly with separate inlets and manifolds for delivering separate processing gases into a processing volume of the chamber without mixing the gases prior to entering the processing volume. The showerhead includes a plurality of gas distribution devices disposed within a plurality of gas inlets for injecting one of the processing gases into and distributing it across a manifold for uniform delivery into the processing volume of the chamber. Each of the gas distribution devices preferably has a nozzle configured to evenly distribute the processing gas flowing therethrough while minimizing recirculation of the processing gas within the manifold. As a result, improved deposition uniformity is achieved on a plurality of substrates positioned in the processing volume of the processing chamber.