Plasma processing apparatus and plasma processing method
First Claim
1. A plasma processing apparatus having a process chamber in which substrates are subjected to plasma processing in lots comprising;
- a light-receiving part for monitoring a plasma emission in said 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 (Pij for j-th substrate of i-th lot);
a database for storing a filter vector for obtaining the principal component scores;
first means to determine a difference (Di,j=Pi,j−
Pi-1,j) of average principal component scores of a substrate in a lot compared to that of a substrate in an identical position in the previous lot;
second means to determine an average, a difference of minimum and maximum, and a standard deviation of (Dij) for all substrates in a lot;
third means to compare the average, the difference of minimum and maximum, and the standard deviation, as determined, with preset thresholds to determine an end point of seasoning; and
a controller for controlling an operation of said plasma processing apparatus.
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Abstract
A plasma processing apparatus having a process chamber in which an object to be processed is subjected to plasma processing includes a light-receiving part for a spectrometer unit, an arithmetic unit, a database, a determination unit and an apparatus controller. The determination unit determines a condition in the processing chamber that an end point of seasoning is reached. The determination of the condition is performed so that one or more differences between one or more output signals derived from a batch of plasma emission data by multivariate analysis and one or more output signals derived from a preceding batch of plasma emission data are found, an average value of the differences in one batch, a difference between a maximum and a minimum of the differences in one batch and a standard deviation of the differences in one batch are determined, and the values are compared with a preset threshold.
8 Citations
18 Claims
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1. A plasma processing apparatus having a process chamber in which substrates are subjected to plasma processing in lots comprising;
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a light-receiving part for monitoring a plasma emission in said 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 (Pij for j-th substrate of i-th lot); a database for storing a filter vector for obtaining the principal component scores; first means to determine a difference (Di,j=Pi,j−
Pi-1,j) of average principal component scores of a substrate in a lot compared to that of a substrate in an identical position in the previous lot;second means to determine an average, a difference of minimum and maximum, and a standard deviation of (Dij) for all substrates in a lot; third means to compare the average, the difference of minimum and maximum, and the standard deviation, as determined, with preset thresholds to determine an end point of seasoning; and a controller for controlling an operation of said plasma processing apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification