Patent ID: 8980379
Filing Date: 2015-03-17
Classification: C23C,H01L

Abstract:
1. A method, comprising: introducing a cleaning gas to a processing chamber; applying an electrical bias to a gas distribution showerhead that is coupled to the processing chamber while a substrate support disposed opposite the showerhead is electrically floating or grounded, the showerhead having a showerhead body comprising stainless steel having a roughened surface with a ceramic coating thereover facing the substrate support, the ceramic coating deposited on the roughened surface while controlling deposition pressure to form a desired roughness, the showerhead body having a plurality of first gas passages and a plurality of second gas passages extending therethrough, the electrical bias igniting the cleaning gas into a plasma containing cleaning gas radicals and ions; reacting the cleaning gas radicals with deposits formed on the ceramic coating by bombarding the ceramic coating with the cleaning gas radicals to form a byproduct and expose the ceramic coating, the exposed ceramic coating having an emissivity within 2 percent of the emissivity of the ceramic coating prior to formation of the deposits thereon; and exhausting the byproduct from the processing chamber.