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Enhanced performance of an Ag(100) photocathode by an ultra-thin MgO film
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Benjamin, Christopher, Churn, H. M., Rehaag, T. J., Soomary, L. A. J., Welsch, C. P., Jones, L. B., Noakes, T. C. Q. and Bell, Gavin R. (2022) Enhanced performance of an Ag(100) photocathode by an ultra-thin MgO film. Journal of Applied Physics, 132 (19). 195303. doi:10.1063/5.0124528 ISSN 0021-8979.
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Official URL: https://doi.org/10.1063/5.0124528
Abstract
Metal photocathodes are widely utilized as electron sources for particle accelerators for their ease of use, high durability, and fast response time. However, the high work function (WF) and low quantum efficiency (QE) typically observed in metals necessitate the use of high power deep UV lasers. Metal oxide ultra-thin films on metals offer a route to photocathodes with a lower WF and improved QE while maintaining photocathode durability and response time. We show how the photocathode performance of an Ag(100) single crystal is enhanced by the addition of an ultra-thin MgO film. The film growth and WF reduction of 1 eV are characterized, and the QE and mean transverse energy (MTE) are measured as a function of illumination wavelength. An eightfold increase of QE is achieved at 266 nm without adding to MTE through additional surface roughness, and the resistance of the photocathode to O2 gas is greatly improved.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Photocathodes, Silver, Magnesium oxide, Thin films | ||||||||
Journal or Publication Title: | Journal of Applied Physics | ||||||||
Publisher: | American Institute of Physics | ||||||||
ISSN: | 0021-8979 | ||||||||
Official Date: | 2022 | ||||||||
Dates: |
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Volume: | 132 | ||||||||
Number: | 19 | ||||||||
Article Number: | 195303 | ||||||||
DOI: | 10.1063/5.0124528 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 20 December 2022 | ||||||||
Date of first compliant Open Access: | 20 December 2022 | ||||||||
RIOXX Funder/Project Grant: |
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