Patent ID: 9735025
Date: 2017-08-15
CPC Classifications: H01J,H01L

Claim:
1. An etching method of etching a first region and a second region of a processing target object, the first region including a multilayered film in which first dielectric films and second dielectric films are alternately stacked, the second dielectric films being silicon nitride films, the second region including a single-layered silicon oxide film, and the processing target object including a mask provided with openings on the first region and the second region, the etching method comprising: mounting the processing target object on an electrostatic chuck provided within a processing vessel of a plasma processing apparatus; generating plasma of a first processing gas containing a fluorocarbon gas and an oxygen gas within the processing vessel; and generating plasma of a second processing gas containing a hydrogen gas, nitrogen trifluoride gas and a carbon-containing gas within the processing vessel, wherein a temperature of the electrostatic chuck is set to a first temperature in the generating of the plasma of the first processing gas, and the temperature of the electrostatic chuck is set to a second temperature lower than the first temperature in the generating of the plasma of the second processing gas.