Patent ID: 9437451
Filing Date: 2016-09-06
CPC Classification: H01J,H01L

Claim Text:
1. A method of etching a patterned substrate in a substrate processing region of a substrate processing chamber, wherein the patterned substrate has an exposed silicon oxide region, the method comprising: flowing a fluorine-containing precursor into a remote plasma region fluidly coupled to the substrate processing region while forming a remote plasma in the remote plasma region to produce plasma effluents; flowing a nitrogen-and-hydrogen-containing precursor into the substrate processing region without first passing the nitrogen-and-hydrogen-containing precursor through the remote plasma region; flowing the plasma effluents through a showerhead separating the remote plasma region from the substrate processing region; and etching the exposed silicon oxide region with the combination of the plasma effluents and the nitrogen-and-hydrogen-containing precursor in the substrate processing region.