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

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.

Citation

Suwanwong , S , Eknapakul , T , Rattanachai , Y , Masingboon , C , Rattanasuporn , S , Pattanakun , R , Nakajima , H , King , P , Hodak , S K & Meevasana , W 2015 , ' The dynamics of ultraviolet-induced oxygen vacancy at the surface of insulating SrTiO 3 (001) ' , Applied Surface Science , vol. 355 , pp. 210-212 . https://doi.org/10.1016/j.apsusc.2015.06.171

Publication

Applied Surface Science

Status

Peer reviewed

DOI

https://doi.org/10.1016/j.apsusc.2015.06.171

ISSN

0169-4332

Type

Journal article

Rights

Copyright © 2015 Elsevier B.V. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org10.1016/j.apsusc.2015.06.171

Collections

University of St Andrews Research

URI

http://hdl.handle.net/10023/9128