Patent ID: 6162336
Filing Date: 2000-12-19
Classification: C23C,H01L,Y10S

Abstract:
An apparatus for securing a semiconductor wafer having a circular surface having a periphery in addition to having a back surface, a front surface and a center, against motion during wafer processing, comprising:a compound clamping ring having a compound structure comprising a first and a second cut-back with both first and second cut-backs facing said front surface of said wafer, further having an inner diameter defining a circular opening having a center, said compound clamping ring having one continuous planar clamping surface for pressure opposition along said periphery of said wafer front surface of said wafer to effect wafer clamping;a wafer pedestal to which said wafer is securely attached during wafer processing; anda means of further securing said wafer to said wafer pedestal during wafer processing to further control flow of gas from a processing area to said back surface of said wafer and to control flow of contaminants from said back surface of said wafer to a processing area.