Dr. Shuo Huang Profile

Dr. Shuo Huang

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Proceedings Article | 13 April 2021 Presentation + Paper

Using machine learning etch models in OPC and ILT correction

Kevin Hooker, Lena Zavyalova, Shuo Huang, Li-Jin Chen

Proceedings Volume 11614, 116140B (2021) https://doi.org/10.1117/12.2587225

KEYWORDS: Etching, Optical proximity correction, Machine learning, Photomasks, Model-based design, Semiconductors, Neural networks, Extreme ultraviolet lithography, Deep ultraviolet

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As feature resolution and process variations continue to shrink for new nodes of both DUV and EUV lithography, the density and number of devices on advanced semiconductor masks continue to increase rapidly. These advances cause significantly increased pressure on the accuracy and efficiency of OPC mask output. To meet manufacturing yield requirements, systematic errors from all sources are important to consider during mask synthesis. Specifically, accurately considering etch effects within OPC and ILT is becoming more critical. Mask synthesis flows have typically accounted for etch proximity effects using rule-based approaches, and the accuracy limitations of fast etch models has limited wide-spread adoption of model-based etch mask correction approaches. Several publications and industry presentations have discussed the use of neural networks or other machine learning techniques to provide improvements in both accuracy and efficiency in mask synthesis flows. In this paper, we present results of using machine learning in etch models to improve model accuracy without sacrificing TAT. Then we demonstrate an ILT based etch correction method using the machine learning etch model that converges quickly and outputs an ADI target contour to be used as the target for OPC or ILT mask correction.

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