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Chi-Ian Ip

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Proceedings Article | 26 August 2024 Paper

Enhancement of mask data verification with Smart-MRC and machine learning

Fei-Lin Liu, Shu-Yi Chou, Chi-Ian Ip, Hui-Min Leong, Min-Ru Wei, Po-Sheng Wang, Liang-Chieh Lin, Saghir Munir

Proceedings Volume 13177, 131770X (2024) https://doi.org/10.1117/12.3034282

KEYWORDS: Data conversion, Machine learning, Inspection, Electronic design automation, Manufacturing, Photomasks, Data modeling, Education and training, Image classification, Data processing

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In the photomask manufacturing industry, photomask source design data needs to be converted into several different target formats, such as MEBES fracture, writer file, die-to-database inspection data etc. Due to the various conversion needs in the manufacturing flow, different EDA tools from different software vendors are employed during conversion. Two different EDA tools that are given the same input can result in slight differences in the output pattern and this will lead to causation of CD errors relative to the underlying pattern tolerances and/or specifications. During the photomask production process, it is very challenging to identify and classify these small differences in the output pattern caused by the conversion of data. In this study, we developed a novel solution to alert on pattern discrepancy by utilizing the classification generated by the application of machine leaning techniques and Smart-MRC tools. A Convolutional Neural Network (CNN) model is being introduced in this study and is trained by learning pre-classified data and classification result would be generated after inputting data to the CNN model. This new Mask Data Preparation (MDP) technique is expected to reduce the use of human resources in the classification process and will bring significant enhancement to our data validation steps to ensure pattern integrity across the entire photomask manufacturing tool chain. Furthermore, the risk of anomalies introduced by updating EDA software tools and their respective version is also mitigated.

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