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

Abstract

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 withmore » CsBr.« less

Authors:
 [1];  [2];  [2];  [1]
+ Show Author Affiliations
  1. Department of Physics and Astronomy and London Center for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United Kingdom
  2. Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352 United States
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
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)
OSTI Identifier:
1223599
Alternate Identifier(s):
OSTI ID: 1243242
Report Number(s):
PNNL-SA-114919
Journal ID: ISSN 1932-7447
Grant/Contract Number:  
KC030102016248; AC05-76RL01830
Resource Type:
Published Article
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Name: Journal of Physical Chemistry. C Journal Volume: 119 Journal Issue: 42; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; excitons; desorption; thin films; energy; kinetics

Citation Formats

Halliday, M. T. E., Joly, A. G., Hess, W. P., and Shluger, A. L. Photoinduced Br Desorption from CsBr Thin Films Grown on Cu(100). United States: N. p., 2015. Web. doi:10.1021/acs.jpcc.5b08275.
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Halliday, M. T. E., Joly, A. G., Hess, W. P., & Shluger, A. L. Photoinduced Br Desorption from CsBr Thin Films Grown on Cu(100). United States. https://doi.org/10.1021/acs.jpcc.5b08275
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Halliday, M. T. E., Joly, A. G., Hess, W. P., and Shluger, A. L. Wed . "Photoinduced Br Desorption from CsBr Thin Films Grown on Cu(100)". United States. https://doi.org/10.1021/acs.jpcc.5b08275.
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@article{osti_1223599,
title = {Photoinduced Br Desorption from CsBr Thin Films Grown on Cu(100)},
author = {Halliday, M. T. E. and Joly, A. G. and Hess, W. P. and Shluger, A. L.},
abstractNote = {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.},
doi = {10.1021/acs.jpcc.5b08275},
journal = {Journal of Physical Chemistry. C},
number = 42,
volume = 119,
place = {United States},
year = {Wed Oct 07 00:00:00 EDT 2015},
month = {Wed Oct 07 00:00:00 EDT 2015}
}
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https://doi.org/10.1021/acs.jpcc.5b08275
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