25 October 2012 First steps towards a scatterometry reference standard
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Abstract
Supported by the European Commission and EURAMET, a consortium of 10 participants from national metrology institutes, universities and companies has recently started a joint research project with the aim of overcoming current challenges in optical scatterometry for traceable linewidth metrology and to establish scatterometry as a traceable and absolute metrological method for dimensional measurements. This requires a thorough investigation of the influence of all significant sample, tool and data analysis parameters, which affect the scatterometric measurement results. For this purpose and to improve the tool matching between scatterometers, CD-SEMs and CD-AFMs, experimental and modelling methods will be enhanced. The different scatterometry methods will be compared with each other and with specially adapted atomic force microscopy (AFM) and scanning electron microscopy (SEM) measurement systems. Additionally novel methods for sophisticated data analysis will be developed and investigated to reach significant reductions of the measurement uncertainties in critical dimension (CD) metrology. To transfer traceability to industrial applications of scatterometry an important step and one final goal of this project is the realisation of different waferbased reference standard materials for calibration of scatterometers. The approaches to reach these goals and first design considerations and preliminary specification of the scatterometry standards are presented and discussed.
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Bernd Bodermann, Bernd Bodermann, Poul-Erik Hansen, Poul-Erik Hansen, Sven Burger, Sven Burger, Mark-Alexander Henn, Mark-Alexander Henn, Hermann Gross, Hermann Gross, Markus Bär, Markus Bär, Frank Scholze, Frank Scholze, Johannes Endres, Johannes Endres, Matthias Wurm, Matthias Wurm, "First steps towards a scatterometry reference standard", Proc. SPIE 8466, Instrumentation, Metrology, and Standards for Nanomanufacturing, Optics, and Semiconductors VI, 84660E (25 October 2012); doi: 10.1117/12.929903; https://doi.org/10.1117/12.929903
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