Patent ID: 7504040
Filing Date: 2009-03-17
Classification: H01J,H01L

Abstract:
1. A plasma processing method, comprising: a step of fixing a wafer via an electrostatic chuck; a step of applying a first radio-frequency power for generating a plasma having a first frequency and a second radio-frequency power for controlling ion energy having a second frequency lower than the first frequency to thereby plasma-process the wafer; a step of maintaining plasma discharge within a range in which the plasma processing does not progress by turning off the second radio-frequency power and lowering the first radio-frequency power or turning off the first radio-frequency power and lowering the second radio-frequency power after the plasma processing is finished; a step of stopping supply of a coolant gas supplied to a back face of the wafer via the electrostatic chuck; a step of stopping application of a direct-current voltage to the electrostatic chuck; and a step of stopping the plasma discharge after stopping the application of the direct-current voltage.