Photoinduced Br Desorption from CsBr Thin Films Grown on Cu(100)

Halliday, M. T. E.; Joly, A. G.; Hess, W. P.; Shluger, A. L.

doi:10.1021/acs.jpcc.5b08275

Title: Photoinduced Br Desorption from CsBr Thin Films Grown on Cu(100)

Journal Article · Wed Oct 07 00:00:00 EDT 2015 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.5b08275· OSTI ID:1223599

Halliday, M. T. E. ^[1]; Joly, A. G. ^[2]; Hess, W. P. ^[2]; Shluger, A. L. ^[1]

Department of Physics and Astronomy and London Center for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United Kingdom
Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352 United States

Thin films of CsBr deposited onto metals such as copper are potential photocathode materials for light sources and other applications. We investigate desorption dynamics of Br atoms from CsBr films grown on insulator (KBr, LiF) and metal (Cu) substrates induced by sub-bandgap 6.4 eV laser pulses. The experimental results demonstrate that the peak kinetic energy of Br atoms desorbed from CsBr/Cu films is much lower than that for the hyperthermal desorption from CsBr/LiF films. Kelvin probe measurements indicate negative charge at the surface following Br desorption from CsBr/Cu films. Our ab initio calculations of excitons at CsBr surfaces demonstrate that this behavior can be explained by an exciton model of desorption including electron trapping at the CsBr surface. Trapped negative charges reduce the energy of surface excitons available for Br desorption. We examine the electron-trapping characteristics of low-coordinated sites at the surface, in particular, divacancies and kink sites. We also provide a model of cation desorption caused by Franck-Hertz excitation of F centers at the surface in the course of irradiation of CsBr/Cu films. These results provide new insights into the mechanisms of photoinduced structural evolution of alkali halide films on metal substrates and activation of metal photocathodes coated with CsBr.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: KC030102016248; AC05-76RL01830

OSTI ID:: 1223599

Alternate ID(s):: OSTI ID: 1243242

Report Number(s):: PNNL-SA-114919

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Vol. 119 Journal Issue: 42; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
excitons
desorption
thin films
energy
kinetics

Title: Photoinduced Br Desorption from CsBr Thin Films Grown on Cu(100)

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