Effects of hydrogen anneals on oxygen deficient SrTiO3-x single crystals

Bharat Jalan, Roman Engel-Herbert, Thomas E. Mates, Susanne Stemmer

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Abstract

The influence of hydrogen gas anneals on the electrical properties of nominally undoped, oxygen-deficient SrTiO3-x single crystals was investigated. Titanium getter layers and vacuum anneals were used to obtain oxygen-deficient SrTiO3-x with a low electrical resistivity. These crystals showed an optical absorption peak at 2.92 eV and strong midinfrared absorption. Subsequent anneals at 800 °C in forming gas, which contained 10% hydrogen, returned the crystals into the insulating, transparent state. The mechanisms by which hydrogen anneals can compensate for the effects of oxygen vacancies in SrTiO3-x are discussed. The results show that forming gas anneals of stoichiometric SrTiO3 can lead to complex electrical conduction behavior.

Original languageEnglish (US)
Article number052907
JournalApplied Physics Letters
Volume93
Issue number5
DOIs
StatePublished - Sep 24 2008

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