Patent ID: 6370004
Filing Date: 2002-04-09
Classification: G03F,H01L,Y10T

Abstract:
An electrostatic chuck comprising a substrate, an inner electrode and an outer electrode each made of a metal and concentrically buried in the substrate, a plurality of embossed portions formed on a main plane of the substrate, and a projecting portion made of the same material as that of said plurality of embossed portions and formed on substantially an entire outer peripheral portion on the main plane of the substrate on which said plurality of embossed portions are formed, wherein positive and negative potentials are to be applied to the inner and outer electrodes, respectively, or vice versa, an object to be treated is to be supported by said plurality of said embossed portions and said projecting portion, and a sum of a total area of upper surfaces of the embossed portions in a zone of the main plane of the substrate in which the outer electrode is located and an area of an upper surface of said projecting portion in the zone of the main plane of the substrate in which the outer electrode is located is in a range of 0.7 to 1.3 of a total area of upper surfaces of the embossed portions in a zone of the main plane of the substrate in which the inner electrode is located.