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Selected Works of Santosh KC
Article
Symmetry driven control of optical properties in WO3 films
APL Materials (2017)
  • Andreas Herklotz, Oak Ridge National Library
  • Stefania Florina Rus, National Institute of Research and Development in Electrochemistry and Condensed Matter
  • Santosh KC, Oak Ridge National Laboratory
  • Valentino R. Cooper, Oak Ridge National Laboratory
  • Amanda Huon, Oak Ridge National Library
  • Er-Jia Guo, Oak Ridge National Laboratory
  • Thomas Z. Ward, Oak Ridge National Laboratory
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Abstract
In this work, we demonstrate that the optical bandgap of WO3 films can be continuously
controlled through uniaxial strain induced by low-energy helium implantation.
The insertion of He into epitaxially grown and coherently strained WO3 films can
be used to induce single axis out-of-plane lattice expansion of up to 2%. Ellipsometric
spectroscopy reveals that the optical bandgap is reduced by about 0.18 eV
per percent expansion of the out-of-plane unit cell length. Density functional theory
calculations show that this response is a direct result of changes in orbital degeneracy
driven by changes in the octahedral rotations and tilts.
Disciplines
Publication Date
June 23, 2017
DOI
10.1063/1.4989395
Publisher Statement
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This article was published in APL Materials, volume 5, issue 6, 2017, and can also be found online here.
Citation Information
Andreas Herklotz, Stefania Florina Rus, Santosh KC, Valentino R. Cooper, et al.. "Symmetry driven control of optical properties in WO3 films" APL Materials Vol. 5 Iss. 6 (2017)
Available at: http://works.bepress.com/santosh-kc/11/
Creative Commons license
Creative Commons License
This work is licensed under a Creative Commons CC_BY International License.