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Real-time monitoring and control in plasma etching

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3 Author(s)
McLaughlin, K.J. ; Dept. of Chem. Eng., Texas Univ., Austin, TX, USA ; Edgar, T.F. ; Trachtenberg, I.

Process control strategies have been developed for plasma etching of silicon (Si) and silicon dioxide (SiO/sub 2/) in a CF/sub 4//O/sub 2/ plasma. The analysis considered four measured variables, four manipulated variables, and up to seven performance variables. Empirical input-output models were developed by regression analysis. Relative gain array analysis and singular value decomposition were used to select manipulated/process variable control loop pairings and to evaluate potential difficulties in control system performance. Singular value decomposition was also used to determine process/performance variable pairings. Block relative gain analysis of multivariable interactions in the process indicated that partial decoupling was necessary for adequate control, and this was verified by simulation.<>

Published in:

Control Systems, IEEE  (Volume:11 ,  Issue: 3 )