Patent ID: 9607811
Date: 2017-03-28
CPC Classifications: H01J,H01L

Claim:
1. A workpiece processing method including: a first process of generating plasma of a first gas containing a silicon halide gas in a processing container of a plasma processing apparatus that accommodates a workpiece including an etching target layer, an organic film formed on the etching target layer, a silicon-containing antireflective film formed on the organic film, and a first mask having a resist mask provided on the antireflective film, to form a reactive precursor; a second process of purging a space in the processing container; a third process of generating plasma of a second gas containing oxygen gas in the processing container to form a silicon oxide film including a first region, a second region, and a third region, and the first region extending above a top surface of the first mask and above the third region, and the second region extending between adjacent third regions and on a surface of the antireflective film, and the third region extending from the surface of the antireflective film to a bottom of the first region; and a fourth process of purging the space in the processing container, wherein a sequence including the first process to the fourth process is repeated, after executing the sequence including the first process to the fourth process, the method further comprises: removing the first region and the second region of the silicon oxide film by plasma of a third gas including a fluorocarbon gas in the processing container; etching the antireflective film by the plasma of the third gas including the fluorocarbon gas in the processing container using a second mask including the first mask and the third region of the silicon oxide film; and etching the organic film by the plasma of the second gas including the oxygen gas in the processing container, and in the first process, the processing container is set to a high-pressure and low-power condition that a pressure therein is 13.33 Pa or more, a power of a high-frequency power source for plasma generation is 100 W or less, and no bias power for drawing ions is applied to a pedestal that supports the workpiece.