28 March 2017 Application of advanced diffraction based optical metrology overlay capabilities for high-volume manufacturing
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Abstract
On-product overlay requirements are becoming more challenging with every next technology node due to the continued decrease of the device dimensions and process tolerances. Therefore, current and future technology nodes require demanding metrology capabilities such as target designs that are robust towards process variations and high overlay measurement density (e.g. for higher order process corrections) to enable advanced process control solutions. The impact of advanced control solutions based on YieldStar overlay data is being presented in this paper. Multi patterning techniques are applied for critical layers and leading to additional overlay measurement demands. The use of 1D process steps results in the need of overlay measurements relative to more than one layer. Dealing with the increased number of overlay measurements while keeping the high measurement density and metrology accuracy at the same time presents a challenge for high volume manufacturing (HVM). These challenges are addressed by the capability to measure multi-layer targets with the recently introduced YieldStar metrology tool, YS350. On-product overlay results of such multi-layers and standard targets are presented including measurement stability performance.
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Kai-Hsiung Chen, Kai-Hsiung Chen, Guo-Tsai Huang, Guo-Tsai Huang, Hung-Chih Hsieh, Hung-Chih Hsieh, Wei-Feng Ni, Wei-Feng Ni, S. M. Chuang, S. M. Chuang, T. K. Chuang, T. K. Chuang, Chih-Ming Ke, Chih-Ming Ke, Jacky Huang, Jacky Huang, Shiuan-An Rao, Shiuan-An Rao, Aysegul Cumurcu Gysen, Aysegul Cumurcu Gysen, Maxime d'Alfonso, Maxime d'Alfonso, Jenny Yueh, Jenny Yueh, Pavel Izikson, Pavel Izikson, Aileen Soco, Aileen Soco, Jon Wu, Jon Wu, Tjitte Nooitgedagt, Tjitte Nooitgedagt, Jeroen Ottens, Jeroen Ottens, Yong Ho Kim, Yong Ho Kim, Martin Ebert, Martin Ebert, } "Application of advanced diffraction based optical metrology overlay capabilities for high-volume manufacturing", Proc. SPIE 10145, Metrology, Inspection, and Process Control for Microlithography XXXI, 1014528 (28 March 2017); doi: 10.1117/12.2257894; https://doi.org/10.1117/12.2257894
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