Direct observation of bi-alkali antimonide photocathodes growth via in operando x-ray diffraction studies

Ruiz-Osés, M.; Schubert, S.; Attenkofer, K.; Ben-Zvi, I.; Liang, X.; Muller, E.; Padmore, H.; Rao, T.; Vecchione, T.; Wong, J.; Xie, J.; Smedley, J.

doi:10.1063/1.4902544

Title: Direct observation of bi-alkali antimonide photocathodes growth via in operando x-ray diffraction studies

Journal Article · Mon Dec 01 00:00:00 EST 2014 · APL Materials

DOI:https://doi.org/10.1063/1.4902544· OSTI ID:1184027

; Schubert, S.; Attenkofer, K.;

;

; Muller, E.; Padmore, H.; Rao, T.; Vecchione, T.; Wong, J.; Xie, J.; Smedley, J.

Alkali antimonides have a long history as visible-light-sensitive photocathodes. This study focuses on the process of fabrication of the bi-alkali photocathodes, K₂CsSb. In-situ synchrotron x-ray diffraction and photoresponse measurements were used to monitor phase evolution during sequential photocathode growth mode on Si(100) substrates. The amorphous-to-crystalline transition for the initial antimony layer was observed at a film thickness of 40 Å . The antimony crystalline structure dissolved upon potassium deposition, eventually recrystallizing upon further deposition into K-Sb crystalline modifications. This transition, as well as the conversion of potassium antimonide to K₂CsSb upon cesium deposition, is correlated with changes in the quantum efficiency.

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

Sponsoring Organization:: USDOE

Contributing Organization:: ATLAS Collaboration

Grant/Contract Number:: AC02-98CH10886; FG02-08ER41547; KC-04-01-010; AC02-06CH11357; AC02-05CH11231

OSTI ID:: 1184027

Alternate ID(s):: OSTI ID: 1212304; OSTI ID: 1223273; OSTI ID: 1421179

Journal Information:: APL Materials, Journal Name: APL Materials Vol. 2 Journal Issue: 12; ISSN 2166-532X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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References (12)

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36 MATERIALS SCIENCE
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