Patent ID: 9039909
Filing Date: 2015-05-26
Classification: H01L

Abstract:
1. A plasma etching method for forming, via a mask layer, a hole in a silicon dioxide film formed on an etching stopper layer of a processing target substrate accommodated in a processing chamber by using plasma generated from a processing gas introduced into the processing chamber, the method comprising: a main etching process for etching the silicon dioxide film using, as the processing gas, a gaseous mixture including C a cyclic etching process that is started after at least the part of the etching stopper layer is exposed and after the main etching process is stopped, wherein the cyclic etching process that is started after at least the part of the etching stopper layer is exposed includes: a first etching process using a gaseous mixture of a C a second etching process using a gaseous mixture of a C the first etching process and the second etching process are alternately performed plural times.