Near atomically smooth alkali antimonide photocathode thin films

Feng, Jun; Karkare, Siddharth; Nasiatka, James; Schubert, Susanne; Smedley, John; Padmore, Howard

doi:10.1063/1.4974363

Title: Near atomically smooth alkali antimonide photocathode thin films

Journal Article · Tue Jan 24 00:00:00 EST 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4974363· OSTI ID:1379694

^[1]; Karkare, Siddharth ^[1]; Nasiatka, James ^[1]; Schubert, Susanne ^[1]; Smedley, John ^[2]; Padmore, Howard ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Nano-roughness is one of the major factors degrading the emittance of electron beams that can be generated by high efficiency photocathodes, such as the thermally reacted alkali antimonide thin films. In this paper, we demonstrate a co-deposition based method for producing alkali antimonide cathodes that produce near atomic smoothness with high reproducibility. Here, we calculate the effect of the surface roughness on the emittance and show that such smooth cathode surfaces are essential for operation of alkali antimonide cathodes in high field, low emittance radio frequency electron guns and to obtain ultracold electrons for ultrafast electron diffraction applications.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; KC407-ALSJNT-I00103; SC0005713; KC0407-ALSJNT-I0013

OSTI ID:: 1379694

Alternate ID(s):: OSTI ID: 1361746

Journal Information:: Journal of Applied Physics, Vol. 121, Issue 4; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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Rb based alkali antimonide high quantum efficiency photocathodes for bright electron beam sources and photon detection applications Cultrera, L.; Gulliford, C.; Bartnik, A. Journal of Applied Physics, Vol. 121, Issue 5 https://doi.org/10.1063/1.4975469	journal	February 2017
A cryogenically cooled high voltage DC photoemission electron source Lee, Hyeri; Liu, Xianghong; Cultrera, Luca Review of Scientific Instruments, Vol. 89, Issue 8 https://doi.org/10.1063/1.5024954	journal	August 2018
Codeposition of ultrasmooth and high quantum efficiency cesium telluride photocathodes Gaowei, M.; Sinsheimer, J.; Strom, D. Physical Review Accelerators and Beams, Vol. 22, Issue 7 https://doi.org/10.1103/physrevaccelbeams.22.073401	journal	July 2019
Perspectives on Designer Photocathodes for X-ray Free-Electron Lasers: Influencing Emission Properties with Heterostructures and Nanoengineered Electronic States Moody, Nathan A.; Jensen, Kevin L.; Shabaev, Andrew Physical Review Applied, Vol. 10, Issue 4 https://doi.org/10.1103/physrevapplied.10.047002	journal	October 2018
Quantum Efficiency Enhancement of Bialkali Photocathodes by an Atomically Thin Layer on Substrates Yamaguchi, Hisato; Liu, Fangze; DeFazio, Jeffrey physica status solidi (a), Vol. 216, Issue 23 https://doi.org/10.1002/pssa.201970076	journal	October 2019
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
Electronic Structure of Cesium-based Photocathode Materials from Density Functional Theory: Performance of PBE, SCAN, and HSE06 functionals Saßnick, Holger-Dietrich; Cocchi, Caterina arXiv https://doi.org/10.48550/arxiv.2101.04596	text	January 2021

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