Patent ID: 8609547
Filing Date: 2013-12-17
Classification: H01J,H01L

Abstract:
1. A plasma etching method for plasma etching an oxide film formed on a substrate through a hard mask layer by using a plasma etching apparatus, the plasma etching apparatus including a vacuum-evacuable processing chamber, a lower electrode disposed in the processing chamber and serving as a mounting table for the substrate, an upper electrode disposed to face the lower electrode in the processing chamber, a first high frequency power supply connected to the upper electrode and applying a first high frequency power to the upper electrode, a DC power supply connected to the upper electrode and applying a DC voltage to the upper electrode, and a second frequency power supply connected to the lower electrode and applying a second high frequency power for bias to the lower electrode, the method comprising: loading the substrate into the processing chamber, and mounting the substrate on the lower electrode; supplying a processing gas containing C generating a plasma of the processing gas by applying the first high frequency power to the upper electrode; applying the second high frequency power to the lower electrode; applying the DC voltage to the upper electrode; and plasma etching the oxide film by using the hard mask layer as a mask, wherein said plasma etching the oxide film is carried out while a flow rate ratio of C