The dynamics of ultraviolet-induced oxygen vacancy at the surface of insulating SrTiO3(001)

S Suwanwong, T Eknapakul, Y Rattanachai, C Masingboon, S Rattanasuporn, R Pattanakun, H Nakajima, Phil King, S K Hodak, Worawat Meevasana

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Abstract

The effect of ultra-violet (UV) irradiation on the electronic structure and the surface resistance of an insulating SrTiO3(001) crystal is studied in this work. Upon UV irradiation, we shows that the two-dimensional electron gas (2DEG) emerges at the insulating SrTiO3 surface and there is a pronounced change in the surface resistance. By combining the observations of the change in valance band and the resistance change under different environments of gas pressure and gas species, we find that UV-induced oxygen vacancies at the surface plays a major role in the resistance change. The dynamic of the resistance change at different oxygen pressures also suggests an alternative method of low-pressure sensing.

Original languageEnglish
Pages (from-to)210-212
JournalApplied Surface Science
Volume355
Early online date14 Jul 2015
DOIs
Publication statusPublished - 15 Nov 2015

Keywords

  • Strontium titanate
  • SrTiO3
  • UV irradiation
  • Pressure sensing
  • Electronic structure
  • ARPES

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