Patent ID: 6867144
Filing Date: 2005-03-15
Classification: H01J

Abstract:
1. A plasma etching method of a wafer, comprising the steps of: electrostatically attracting said wafer which has a gate oxide film onto a water mounting electrode in a vacuum processing chamber; introducing a mixed gas into said vacuum processing chamber on the basis of an etching recipe; generating a magnetic field inside said vacuum processing chamber; generating a plasma in said vacuum processing chamber; applying a bias power to said wafer to accelerate ions in said plasma toward said wafer; and setting an impedance of a portion of said wafer mounting electrode which corresponds to an outer periphery of said wafer, as viewed from a bias power supply, to a value which is greater than that of a center portion of said wafer mounting electrode using an electrode arranged within said wafer mounting electrode at a position corresponding to the outer periphery of said wafer and formed under an insulating film for electrostatically attracting said wafer.