Patent ID: 7147748
Filing Date: 2006-12-12
Classification: G01N,H01J,H01L,H05H

Abstract:
1. A plasma processing method to subject substrates to plasma processing in lots having: a light-receiving part for monitoring a plasma emission in a process chamber; a spectrometer unit for performing a spectrometry on said plasma emission and to convert the same into a multi-channel signal; an arithmetic unit for performing principal component analysis on the multi-channel signal for each substrate to obtain an average of principal component scores (P a database for storing a filter vector for obtaining the principal component scores; and a controller for controlling an operation of said plasma processing apparatus; the method comprising: step (A) of determining a difference (D step (B) of determining an average, a difference of minimum and maximum, and a standard deviation of (D step (C) of comparing the average, the difference of minimum and maximum, and the standard deviation, as determined, with preset thresholds to determine an end point of seasoning.