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Proceedings Paper

Complex metrology on 3D structures using multi-channel OCD
Author(s): Taher Kagalwala; Sridhar Mahendrakar; Alok Vaid; Paul K. Isbester; Aron Cepler; Charles Kang; Naren Yellai; Matthew Sendelbach; Mihael Ko; Ovadia Ilgayev; Yinon Katz; Lilach Tamam; Ilya Osherov
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Paper Abstract

Device scaling has not only driven the use of measurements on more complex structures, in terms of geometry, materials, and tighter ground rules, but also the need to move away from non-patterned measurement sites to patterned ones. This is especially of concern for very thin film layers that have a high thickness dependence on structure geometry or wafer pattern factor. Although 2-dimensional (2D) sites are often found to be sufficient for process monitoring and control of very thin films, sometimes 3D sites are required to further simulate structures within the device. The measurement of film thicknesses only a few atoms thick on complex 3D sites, however, are very challenging. Apart from measuring thin films on 3D sites, there is also a critical need to measure parameters on 3D sites, which are weak and less sensitive for OCD (Optical Critical Dimension) metrology, with high accuracy and precision. Thus, state-ofthe-art methods are needed to address such metrology challenges. This work introduces the concept of Enhanced OCD which uses various methods to improve the sensitivity and reduce correlations for weak parameters in a complex measurement. This work also describes how more channels of information, when used correctly, can improve the precision and accuracy of weak, non-sensitive or complex parameters of interest.

Paper Details

Date Published: 28 March 2017
PDF: 9 pages
Proc. SPIE 10145, Metrology, Inspection, and Process Control for Microlithography XXXI, 101451C (28 March 2017); doi: 10.1117/12.2261419
Show Author Affiliations
Taher Kagalwala, GLOBALFOUNDRIES Inc. (United States)
Sridhar Mahendrakar, GLOBALFOUNDRIES Inc. (United States)
Alok Vaid, GLOBALFOUNDRIES Inc. (United States)
Paul K. Isbester, Nova Measuring Instruments, Inc. (United States)
Aron Cepler, Nova Measuring Instruments, Inc. (United States)
Charles Kang, Nova Measuring Instruments, Inc. (United States)
Naren Yellai, Nova Measuring Instruments, Inc. (United States)
Matthew Sendelbach, Nova Measuring Instruments, Inc. (United States)
Mihael Ko, Nova Measuring Instruments, Ltd. (Israel)
Ovadia Ilgayev, Nova Measuring Instruments, Ltd. (Israel)
Yinon Katz, Nova Measuring Instruments, Ltd. (Israel)
Lilach Tamam, Nova Measuring Instruments, Ltd. (Israel)
Ilya Osherov, Nova Measuring Instruments, Ltd. (Israel)

Published in SPIE Proceedings Vol. 10145:
Metrology, Inspection, and Process Control for Microlithography XXXI
Martha I. Sanchez, Editor(s)

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