We have developed an automatic lens control and parameter settings scheme (on-product iLC) for thermal aberration predictive (feedforward) and calibration (feedback) control. Thermal aberration control is essential for critical layers, and lens control parameter setup time reduction is imperative in maximizing scanner uptime. In our experiment, during production lot exposure the new scheme automatically corrected lens control parameters to within sufficient imaging accuracy tolerances, and demonstrated a dramatic reduction in layer setup time compared with the conventional approach, and we will discuss an actual use-case in this paper.
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