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Effects of surface oxygen vacancies on electronic states of TiO2(110), TiO2(001) and SrTiO3(001) surfaces

✍ Scribed by Y. Aiura; Y. Nishihara; Y. Haruyama; T. Komeda; S. Kodaira; Y. Sakisaka; T. Maruyama; H. Kato

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
165 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

We have studied effects of surface oxygen vacancies on electronic states of TiO2(110), TiO2(001) and SrTiO3(001) surfaces by means of angle-resolved photoemission spectroscopy. The surface oxygen vacancy induces a state at ~leV below the Fermi level in the bulk band gap. In the angleresolved photoemission speCtra, this state has slight energy dispersion and doesn't cross the Fermi level when the emission angle is changed. These results indicate that the state induced by surface oxygen vacancies is not simply interpreted by delocalized model, and that the localized behavior also plays an important role for the metal-insulator transition of these materials.

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