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Proceedings Paper

Categories of process variables: robustness optimization, uniformity tuning, and mean adjustment
Author(s): Sungdo Ha; Emanuel Sachs
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Paper Abstract

A new methodology for process optimization is introduced which has the goal of dividing process variables into three categories. Robustness factors are those used to render the process robust against disturbances. Tuning factors are those used to tune the uniformity of a batch. Adjustment factors are those used to adjust the mean of the batch. An objective function called a 3-step SN ratio is derived to enable the 3-step optimization. In the first step, a designed experiment is performed and the results are used to find the best tuning and adjustment factors and to set the levels of the robustness factors. In the second step, the tuning factor (or factors) is used to tune those aspects of the batch uniformity which can be tuned. In the third step, the adjustment factor is used to adjust the batch mean to the target The methodology is illustrated and demonstrated in application to single wafer plasma etching.

Paper Details

Date Published: 1 January 1992
PDF: 12 pages
Proc. SPIE 1594, Process Module Metrology, Control and Clustering, (1 January 1992); doi: 10.1117/12.56636
Show Author Affiliations
Sungdo Ha, Massachusetts Institute of Technology (United States)
Emanuel Sachs, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 1594:
Process Module Metrology, Control and Clustering
Cecil J. Davis; Irving P. Herman; Terry R. Turner, Editor(s)

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