Patent ID: 9099285
Filing Date: 2015-08-04
Classification: C23C,H01J,H01L

Abstract:
1. A plasma processing method comprising: providing a plasma processing apparatus that includes a processing container which defines a processing space and a gas supply unit configured to supply a processing gas into the processing space; supplying the processing gas including a fluorocarbon-based gas, a rare gas, an oxygen gas, and a nitrogen gas into the processing container to generate plasma; and etching multi-layered films which include an oxide layer and a plurality of etching stop layers, the etching stop layers being made of tungsten and disposed below a top surface of the oxide layer in a laminating direction as well as at different positions in the laminating direction, from the top surface of the oxide layer to the plurality of etching stop layers so as to simultaneously form a plurality of holes having different depths in the oxide layer, wherein each of a flow rate of the oxygen gas and a flow rate of the nitrogen gas is controlled to satisfy a condition of Y=−5X+b where X is the flow rate of the oxygen gas, Y is the flow rate of the nitrogen gas, and b is a flow rate between 300 sccm and 375 sccm.