Effect of Sb thickness on the performance of bialkali-antimonide photocathodes

Mamun, Md Abdullah A.; Elmustafa, Abdelmageed A.; Hernandez-Garcia, Carlos; Mammei, Russell; Poelker, Matthew

doi:10.1116/1.4939563

Title: Effect of Sb thickness on the performance of bialkali-antimonide photocathodes

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Abstract

The alkali species Cs and K were codeposited using an effusion source, onto relatively thick layers of Sb (50 nm to ~7 μm) grown on GaAs and Ta substrates inside a vacuum chamber that was baked and not-vented, and also baked and vented with clean dry nitrogen but not rebaked. The characteristics of the Sb films, including sticking probability, surface roughness, grain size, and crystal properties were very different for these conditions, yet comparable values of photocathode yield [or quantum efficiency (QE)] at 284 V were obtained following codeposition of the alkali materials. Photocathodes manufactured with comparatively thick Sb layers exhibited the highest QE and the best 1/e lifetime. As last, the authors speculate that the alkali codeposition enabled optimized stoichiometry for photocathodes manufactured using thick Sb layers, which could serve as a reservoir for the alkali materials.

Authors:

Mamun, Md Abdullah A. ^[1]; Elmustafa, Abdelmageed A. ^[1]; Hernandez-Garcia, Carlos ^[2]; Mammei, Russell ^[2]; Poelker, Matthew ^[2]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Publication Date:: Wed Jan 06 00:00:00 EST 2016

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1325692

Alternate Identifier(s):: OSTI ID: 1421142

Report Number(s):: JLAB-ACC-16-2351; DOE/OR/23177-3948
Journal ID: ISSN 0734-2101; JVTAD6

Grant/Contract Number:: DMR-0420304; FG02-97ER45625, AC05-06OR23177; FG02-97ER45625

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Vacuum Science and Technology A

Additional Journal Information:: Journal Volume: 34; Journal Issue: 2; Journal ID: ISSN 0734-2101

Publisher:: American Vacuum Society

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; photocathodes; antimony; vacuum chambers; tantalum; thin film growth

Citation Formats


                    Mamun, Md Abdullah A., Elmustafa, Abdelmageed A., Hernandez-Garcia, Carlos, Mammei, Russell, and Poelker, Matthew. Effect of Sb thickness on the performance of bialkali-antimonide photocathodes.  United States: N. p., 2016. 
Web.  doi:10.1116/1.4939563.

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                    Mamun, Md Abdullah A., Elmustafa, Abdelmageed A., Hernandez-Garcia, Carlos, Mammei, Russell, & Poelker, Matthew. Effect of Sb thickness on the performance of bialkali-antimonide photocathodes.  United States.  https://doi.org/10.1116/1.4939563

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                    Mamun, Md Abdullah A., Elmustafa, Abdelmageed A., Hernandez-Garcia, Carlos, Mammei, Russell, and Poelker, Matthew. Wed .  
"Effect of Sb thickness on the performance of bialkali-antimonide photocathodes".  United States.  https://doi.org/10.1116/1.4939563.  https://www.osti.gov/servlets/purl/1325692.

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@article{osti_1325692,

  title        = {Effect of Sb thickness on the performance of bialkali-antimonide photocathodes},

  author       = {Mamun, Md Abdullah A. and Elmustafa, Abdelmageed A. and Hernandez-Garcia, Carlos and Mammei, Russell and Poelker, Matthew},

  abstractNote = {The alkali species Cs and K were codeposited using an effusion source, onto relatively thick layers of Sb (50 nm to ~7 μm) grown on GaAs and Ta substrates inside a vacuum chamber that was baked and not-vented, and also baked and vented with clean dry nitrogen but not rebaked. The characteristics of the Sb films, including sticking probability, surface roughness, grain size, and crystal properties were very different for these conditions, yet comparable values of photocathode yield [or quantum efficiency (QE)] at 284 V were obtained following codeposition of the alkali materials. Photocathodes manufactured with comparatively thick Sb layers exhibited the highest QE and the best 1/e lifetime. As last, the authors speculate that the alkali codeposition enabled optimized stoichiometry for photocathodes manufactured using thick Sb layers, which could serve as a reservoir for the alkali materials.},

  doi          = {10.1116/1.4939563},

  journal      = {Journal of Vacuum Science and Technology A},

  number       = 2,

  volume       = 34,

  place        = {United States},

  year         = {Wed Jan 06 00:00:00 EST 2016},

  month        = {Wed Jan 06 00:00:00 EST 2016}

}

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