Patent ID: 9735020
Date: 2017-08-15
CPC Classifications: H01J,H01L,H05H

Claim:
1. A method of etching a semiconductor wafer comprising: injecting a source gas mixture into a process chamber including: injecting a etchant gas mixture into the wafer processing region, the etchant gas mixture being injected through a plurality of injection ports in the top electrode such that the etchant gas mixture mixes with the plasma output from the outlets of the plurality of hollow cathode cavities including generating a desired chemical species in the wafer processing region and wherein the etchant gas mixture is prevented from flowing into the outlets of each of the plurality of hollow cathode cavities by the gas and the plasma flowing from the outlets of each of the plurality of hollow cathode cavities; and etching the surface using the plasma with the injected etchant gas mixture.