Synthesis and x-ray characterization of sputtered bi-alkali antimonide photocathodes

Gaowei, M.; Ding, Z.; Schubert, S.; Bhandari, H. B.; Sinsheimer, J.; Kuehn, J.; Nagarkar, V. V.; Marshall, M. J.; Walsh, J.; Muller, E. M.; Attenkofer, K.; Frisch, H. J.; Padmore, H.; Smedley, J.

doi:10.1063/1.5010950

Title: Synthesis and x-ray characterization of sputtered bi-alkali antimonide photocathodes

Journal Article · Fri Nov 10 00:00:00 EST 2017 · APL Materials

DOI:https://doi.org/10.1063/1.5010950· OSTI ID:1261186

^[1]; Ding, Z. ^[2]; Schubert, S. ^[3]; Bhandari, H. B. ^[4]; Sinsheimer, J. ^[2]; Kuehn, J. ^[5]; Nagarkar, V. V. ^[4]; Marshall, M. J. ^[4]; Walsh, J. ^[1]; Muller, E. M. ^[2];

^[1];

^[6]; Padmore, H. ^[3]; Smedley, J. ^[1]

Brookhaven National Laboratory (BNL), Upton, NY (United States)
Stony Brook University, NY (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Radiation Monitoring Devices, Watertown, MA (United States)
Helmholtz-Zentrum Berlin (HZB), (Germany)
University of Chicago, IL (United States)

Advanced photoinjectors, which are critical to many next generation accelerators, open the door to new ways of material probing, both as injectors for free electron lasers and for ultra-fast electron diffraction. For these applications, the nonuniformity of the electric field near the cathode caused by surface roughness can be the dominant source of beam emittance. Therefore, improving the photocathode roughness while maintaining quantum efficiency is essential to the improvement of beam brightness. Here in this article, we report the demonstration of a bi-alkali antimonide photocathode with an order of magnitude improved roughness by sputter deposition from a K₂CsSb sputter target, using in situ and operando X-ray characterizations. We found that a surface roughness of 0.5 nm for a sputtered photocathode with a final thickness of 42 nm can be achieved while still yielding a quantum efficiency of 3.3% at 530 nm wavelength.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Institute of General Medical Sciences (NIGMS); National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0009540; AC02-05CH11231; SC0012704; SC0017202; SC0017693

OSTI ID:: 1261186

Alternate ID(s):: OSTI ID: 1421047; OSTI ID: 1425174; OSTI ID: 1487081

Report Number(s):: BNL-200031-2018-JAAM; RMD C14-29

Journal Information:: APL Materials, Vol. 5, Issue 11; ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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References (12)

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Electronic structure and core electron fingerprints of caesium-based multi-alkali antimonides for ultra-bright electron sources Cocchi, Caterina; Mistry, Sonal; Schmeißer, Martin Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-54419-0	journal	December 2019