Semiconductor wafer processing apparatus and method

摘要

A wafer stage 2 for holding a semiconductor wafer in a plasma treatment apparatus by setting the wafer on the wafer stage, said wafer stage 2 comprising a base material 26 equipped with refrigerant flow paths for allowing a refrigerant for temperature adjustment to flow; a stress-reducing member 28 provided on the wafer setting side of said base material 26 and having a smaller thermal expansion coefficient than does said base material; a dielectric film 30 provided on the wafer setting side of said stress-reducing member; and a deflection-preventing member 29 provided on the wafer non-setting side of said base material and having a smaller thermal expansion coefficient than does said base material. When the wafer stage is used, the temperature of the wafer as a substrate to be processed can be controlled uniformly and very accurately.