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The electronic state of thin films of yttrium, yttrium hydrides and yttrium oxide

Abstract

Thin films of yttrium hydride have for almost 20 years been under investigation for optoelectronic and solar energy applications due to the hydrogen-induced switching in electronic state from the metallic elemental yttrium and yttrium dihydride to the transparent semiconductor material yttrium trihydride. In this study, we investigate the electronic structure of yttrium, yttrium hydride and yttrium oxide by using X-ray photoelectron spectroscopy and kelvin probe measurements. The investigated samples have been prepared by reactive sputtering deposition. We show that the electronic work function of transparent yttrium hydride is of 4.76 eV and that the recently discovered photochromic reaction lowers the electronic work function of the transparent hydride by 0.2 eV.

Category

Academic article

Client

  • Notur/NorStore / NN4608K
  • Notur/NorStore / nn4608k
  • Research Council of Norway (RCN) / 181884

Language

English

Author(s)

Affiliation

  • Institute for Energy Technology
  • SINTEF Industry / Materials and Nanotechnology
  • Indian Institute of Technology, Madras

Year

2014

Published in

Solar Energy Materials and Solar Cells

ISSN

0927-0248

Publisher

Elsevier

Volume

128

Page(s)

270 - 274

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