Mr. Sylvio Mattick Profile

Sylvio Mattick

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Proceedings Article | 9 March 2021 Presentation + Paper

Investigating SEM-contour to CD-SEM matching

Francois Weisbuch, Jirka Schatz, Sylvio Mattick, Nivea Schuch, Thiago Figueiro, Patrick Schiavone

Proceedings Volume 11611, 116110Y (2021) https://doi.org/10.1117/12.2583715

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The control and the characterization of semiconductor very fine devices on a wafer are commonly performed by mean of a scanning electron microscope (SEM) to derive a critical dimension (CD) from a pair of parallel edges extracted from the images. However, this approach is often not very reliable when dealing with complex 2D patterns. An alternative is to use SEM contour technique to extract all the edges of the image. This method is more versatile and robust but before being implemented in a manufacturing environment, it must demonstrate that it can be matched well with traditional CD-SEM. Aim: The objective of this work is to present a method to evaluate and optimize the CD matching between a reference standard SEM-CD and SEM-Contours. Approach: After describing the metric used to assess the matching performance, we propose to screen some important influent parameters to give an evaluation of the best matching that we achieved with our experimental data. Results: After optimizing the matching calibration parameters and optimizing the selection of the best anchor pattern for the matching we could achieve a 3s-Total Measurement Uncertainty of 0.8 nm and 3.2 nm for 1D and 2D patterns. Conclusions: We established a method to achieve good matching performance that should facilitate the introduction of SEM contour in a manufacturing environment.

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