Contour-based OPC modeling has recently arisen as an alternative to the conventional CD-based method. In this work, an innovative flow is proposed to improve the quality of the final calibrated model by using SEM image contours. Layout pattern sampling technique should be introduced into this flow, which could not only ensure adequate coverage including IPS and pattern diversity, but also minimize the data collection effort. In this study, we have developed an automated high-precision contour extraction method to obtain good and reliable contours that were in good agreement with traditional CD-SEM measurements. The OPC model calibration was built by using the high-precision SEM contours, and we compared the contour-based method with conventional CD measurements. Finally, the model error RMS of the calibration and verification process could be fed back to the layout pattern sampling, which could benefit the sustainable improvement of the predictive ability of the model.
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