Patent ID: 9177823
Filing Date: 2015-11-03
Classification: H01J,H01L

Abstract:
1. A plasma etching method comprising: etching an amorphous carbon film by a plasma of an oxygen-containing gas using, as a mask, an SiON film having a predetermined pattern formed on a target object; etching a silicon oxide film by a plasma of a processing gas using the etched amorphous carbon film as a mask while removing the SiON film remaining on the etched amorphous carbon film by the plasma of the processing gas; modifying the etched amorphous carbon film by a plasma of a sulfur-containing gas or a hydrogen-containing gas while applying a negative DC voltage to an upper electrode containing silicon after the SiON film is removed from the etched amorphous carbon film; and etching the silicon oxide film by the plasma of the processing gas using the modified amorphous carbon film as a mask.