Patent ID: 6149760
Filing Date: 2000-11-21
Classification: H01J,H05H

Abstract:
An apparatus for subjecting a target object to a plasma process by using a plasma, comprising:an airtight process chamber formed in a process vessel;a support member arranged in said process chamber, for supporting said target object in said process chamber;a gas supply system for supplying a process gas into said process chamber;an exhaust system for exhausting and setting said process chamber at a vacuum;an RF antenna for generating an RF electric field for exciting said process gas in said process chamber to convert said process gas into a plasma, said electric field having an electric field direction which is defined essentially by lines of electric force extending substantially parallel to said target object supported by said support member;a power supply for supplying an RF power to said RF antenna; andan interposed wall which has an exposed inner surface exposed to said process chamber and is interposed between said process chamber and said RF antenna, said interposed wall having a dielectric matrix layer and a conductive Faraday shield layer arranged in said matrix layer to extend on a plane substantially parallel to said electric field direction, said Faraday shield layer being electrically grounded and having a thickness of about 10 to 100 .mu.m, wherein, where coefficients of thermal expansion of said matrix layer and said Faraday shield layer are CT1 and CT2, respectively, 0.7 .ltoreq.(CT1/CT2).ltoreq.1.7 is satisfied, said Faraday shield layer being formed by vapor deposition.