Electronic structure of CuCrO2 thin films grown on Al 2O3(001) by oxygen plasma assisted molecular beam epitaxy

D. Shin, J. S. Foord, R. G. Egdell, A. Walsh

Research output: Contribution to journalArticle

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Abstract

Thin films of CuCrO2 have been grown on Al2O 3(001) substrates by oxygen plasma assisted molecular beam epitaxy. With a substrate temperature of 700°C or 750°C, the films showed an unanticipated (015) orientation but at a higher substrate temperature of 800°C the expected basal (001) orientation predominates. The optical absorption spectrum of CuCrO2 shows a direct allowed absorption onset at 3.18eV together with a weak peak at 2.0eV which is suppressed by Sn doping. This suggests that the low energy peak should be attributed to 3d→3d excitations associated with Cu2+ defect states rather than excitations localised on Cr3+. Valence band X-ray photoemission spectra of (001) and (015) oriented CuCrO2 are compared with those obtained from polycrystalline samples.

Original languageEnglish
Article number113718
JournalJournal of Applied Physics
Volume112
Issue number11
DOIs
Publication statusPublished - 2012 Dec 1

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oxygen plasma
molecular beam epitaxy
electronic structure
thin films
excitation
optical spectrum
optical absorption
photoelectric emission
valence
absorption spectra
temperature
defects
x rays
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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abstract = "Thin films of CuCrO2 have been grown on Al2O 3(001) substrates by oxygen plasma assisted molecular beam epitaxy. With a substrate temperature of 700°C or 750°C, the films showed an unanticipated (015) orientation but at a higher substrate temperature of 800°C the expected basal (001) orientation predominates. The optical absorption spectrum of CuCrO2 shows a direct allowed absorption onset at 3.18eV together with a weak peak at 2.0eV which is suppressed by Sn doping. This suggests that the low energy peak should be attributed to 3d→3d excitations associated with Cu2+ defect states rather than excitations localised on Cr3+. Valence band X-ray photoemission spectra of (001) and (015) oriented CuCrO2 are compared with those obtained from polycrystalline samples.",
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Electronic structure of CuCrO2 thin films grown on Al 2O3(001) by oxygen plasma assisted molecular beam epitaxy. / Shin, D.; Foord, J. S.; Egdell, R. G.; Walsh, A.

In: Journal of Applied Physics, Vol. 112, No. 11, 113718, 01.12.2012.

Research output: Contribution to journalArticle

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AU - Shin, D.

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