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- W2898077816 abstract "Semiconductor manufacturing processes are prone to process deviations or other production issues. Quality assurance of every processing step and measuring wafer test values is crucial for finding possible root causes of these problems. Automated visual inspection and recognition of patterns in wafermap data obtained during different processing steps has a potential to signifficantly improve the efficiency of finding early production issues and even help with adjustment of the production parameters to automatically resolve them. In this paper, we present a machine learning approach for unsupervised clustering of spatial patterns in wafermap measurement data. Measured test values are first pre-processed using some computer vision techniques, followed by a feature extraction based on variational autoencoders to decompose high-dimensional wafermaps into a low-dimensional latent representation. Final step is to detect the structure of this latent space and assign individual wafers into clusters. We experimentally evaluate the performance of the proposed method over a real dataset." @default.
- W2898077816 created "2018-10-26" @default.
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- W2898077816 date "2018-07-01" @default.
- W2898077816 modified "2023-09-23" @default.
- W2898077816 title "Unsupervised Wafermap Patterns Clustering via Variational Autoencoders" @default.
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- W2898077816 doi "https://doi.org/10.1109/ijcnn.2018.8489422" @default.
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