Patent ID: 9514959
Filing Date: 2016-12-06
CPC Classification: C07C,H01L

Claim Text:
1. A method for etching silicon-containing films, the method comprising, introducing an etching gas into a plasma reaction chamber containing a silicon-containing film on a substrate, wherein the etching gas is selected from the group consisting of trans-1,1,1,4,4,4-hexafluoro-2-butene; cis-1,1,1,4,4,4-hexafluoro-2-butene; hexafluoroisobutene (CAS No. 382-10-5); pentafluorocyclobutane (1,1,2,2,3-); and tetrafluorocyclobutane (1,1,2,2-); introducing an inert gas into the plasma reaction chamber; and activating a plasma to produce an activated etching gas capable of selectively etching the silicon-containing film from the substrate.