Patent ID: 9588505
Date: 2017-03-07
CPC Classifications: G05B

Claim:
1. A method comprising: processing a first wafer in a chamber of a processing tool; identifying a key chamber parameter of the chamber, the identifying comprising using a difference between a predicted value of the first wafer according to a prediction model and an actual value of the first wafer as a result of the processing the first wafer in the chamber, a first chamber parameter for the actual value of the first wafer being part of a first chamber parameter data set, the difference being part of a residual data set, the key chamber parameter identified in response to a coefficient of determination between the first chamber parameter data set and the residual data set being greater than a first threshold; and during processing a second wafer in the chamber, reducing a difference between a predicted value of the second wafer according to the prediction model and an actual value of the second wafer as a result of the processing the second wafer in the chamber by controlling the chamber based on the key chamber parameter, the predicted value of the second wafer corresponding in type to the predicted value of the first wafer, the actual value of the second wafer corresponding in type to the actual value of the first wafer, the processing the second wafer being after the processing the first wafer.