Patent ID: 7611993
Filing Date: 2009-11-03
Classification: H01J,H01L

Abstract:
1. A plasma processing method for processing a sample by applying a high-frequency bias power for each period (T) which is divided into a first sub-period (T 1 ), a second sub-period (T 2 ), and a third sub-period (T 3 ) along a time axis; wherein the first sub-period (T the second sub-period (T the third sub-period (T wherein the applied power is set at a large value in the first sub-period; wherein a duty ratio T wherein the processing method comprises the steps of: controlling for each period (T), the first sub-period (T processing a plurality of samples with a predetermined processing condition; measuring the CD gain, the select ratio and an etching speed of each of the samples; and executing a feedback control for each processing unit of the samples in accordance with a change of processing state of each of the samples so that the duty ratio T