Mr. Robert L. O'Donnell Profile

Robert L. O'Donnell

at i4one, LLC

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Proceedings Article | 6 December 2004 Paper

Sophisticated yield analysis through novel data clustering and visualization

Michael Jacobson, Jian Ma, Richard Rodrigues, Robert O'Donnell

Proceedings Volume 5567, (2004) https://doi.org/10.1117/12.569346

KEYWORDS: Photomasks, Visualization, Manufacturing, Data processing, Statistical analysis, Image registration, Silicon, Zoom lenses, Databases, Visual analytics

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Mask manufacturing becomes more complicated with each technology generation. The number of tools and processing steps is increasing while the feature geometries and substrate materials are becoming more difficult to process. At the same time, the market demands new product introductions at a faster rate than ever before. The only way to meet all of these challenges is through faster yield (critical dimensions, defects, registration) learning. However, the rate of technology development for manufacturing has far outpaced the development of yield learning solutions. Spreadsheet-based learning tools are severely limited in their ability to handle the complex hierarchical data, and often there is not enough data available for a meaningful statistical analysis. We have deployed a novel application that greatly enhances our ability to perform commonality studies, which are a key element of yield learning. This application is based on treemapping technology, which takes advantage of the human eye's ability to detect subtle changes. Here, data is represented graphically on a two-dimensional screen. However, additional dimensions are included on the same plot through the use of size, color, and hierarchical nesting. This has enabled us to be more sophisticated in our approaches to yield learning through visualizing multidimensional correlations. In addition to improving our ability to perform commonality studies, the tool has also been used for process stability analysis, hold and excursion analysis, and several other manufacturing and engineering applications.

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