Patent ID: 9564344
Date: 2017-02-07
CPC Classifications: G03F,H01L

Claim:
1. A method of removing a resist from a work piece surface in a reaction chamber, the method comprising: forming a first plasma from a process gas mixture comprising molecular hydrogen, a non-carbon-containing fluorine-containing gas and a protectant compound, wherein said non-carbon-containing fluorine-containing gas and said protectant compound are provided in a first volumetric flow ratio, wherein the volumetric ratio of the molecular hydrogen to the non-carbon-containing fluorine-containing gas is at least 10:1; exposing the work piece surface to the first plasma to thereby remove a first portion of the resist from the work piece surface; changing the volumetric flow ratio of said non-carbon-containing fluorine-containing gas and said protectant compound to form a second plasma; and exposing the work piece surface to the second plasma to thereby remove a second portion of the resist from the work piece surface.