Investigation of reliability of the cutoff probe by a comparison with Thomson scattering in high density processing plasmas
Abstract
A "cutoff probe" uses microwaves to measure the electron density in a plasma. It is particularly attractive because it is easy to fabricate and use, its measurement is immune to surface contamination by dielectric materials, and it has a straightforward analysis to measure electron density in real time. In this work, we experimentally investigate the accuracy of the cutoff probe through a detailed comparison with Thomson scattering in a low temperature, high density processing plasma. The result shows that the electron density measured by the cutoff probe is lower than that by Thomson scattering and that the discrepancy of the two results becomes smaller as the gap between the two tips increases and/or the neutral gas pressure decreases. The underestimated electron density found by the cutoff probe can be explained by the influence of the probe holder, which becomes important as the pressure increases and the gap gets closer.
Additional Information
© 2017 Published by AIP Publishing. Received 14 July 2017; accepted 8 November 2017; published online 6 December 2017. This research was supported by the Korea Research Institute of Standards and Science, by the MOTIE [Ministry of Trade, Industry & Energy (10052890 Numerical simulation to overcome process limitations below 10 nm semiconductor and 10053098 Plasma enhanced atomic-layer-deposition process and alternatives for gate spacer and multi-patterning technology)] by the KSRC (Korea Semiconductor Research Consortium) support program for the development of the future semiconductor device, by the Ministry of Science, ICT and Future Planning (NRF-2017M1A7A1A02016321 and NRF-2017R1D1A1A02018310), by the Program of the "2017 plasma BigData ICT Convergence Technology Research Project" through the National Fusion Research Institute of Korea, by the Korea Research Institute of Standards and Science (Kriss—2017—GP2017-0016-01), and by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIP) (No. CAP-17-02-NFRI).Attached Files
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Additional details
- Eprint ID
- 83721
- Resolver ID
- CaltechAUTHORS:20171206-095638236
- 10052890
- Ministry of Trade, Industry & Energy (Korea)
- 10053098
- Ministry of Trade, Industry & Energy (Korea)
- Korea Semiconductor Research Consortium
- NRF-2017M1A7A1A02016321
- Ministry of Science, ICT and Future Planning (Korea)
- NRF-2017R1D1A1A02018310
- Ministry of Science, ICT and Future Planning (Korea)
- National Fusion Research Institute of Korea
- GP2017-0016-01
- Korea Research Institute of Standards and Science
- CAP-17-02-NFRI
- National Research Council of Science & Technology (Korea)
- Created
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2017-12-07Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field