Patent ID: 6432261
Filing Date: 2002-08-13
Classification: H01J

Abstract:
A plasma etching system comprising:a vacuum chamber, a substrate holder arranged within said vacuum chamber, an electrode arranged in said vacuum chamber so as to face said substrate holder, having a process gas introduction mechanism and a gas blowoff plate, and an electric power source for supplying electric power to said electrode, wherein a substrate is loaded on said substrate holder in said vacuum chamber in a vacuum state, the process gas is introduced into said vacuum chamber through said electrode, and said power source applies the electric power between said substrate holder and said electrode to generate plasma used for etching surface of said substrate, and a plurality of magnets arranged concentrically at a rear side of said gas blowoff plate in said electrode within said vacuum chamber, wherein magnetic poles of inner surfaces of said plurality of magnets are arranged to alternate in polarity and the magnetic field strength resulting from said plurality of magnets on the surface of said substrate is substantially 0 Gauss.