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

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

doi:10.1063/1.2969037

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

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

Materials Science and Engineering

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35 Citations (SciVal)

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 language	English (US)
Article number	052907
Journal	Applied Physics Letters
Volume	93
Issue number	5
DOIs	https://doi.org/10.1063/1.2969037
State	Published - 2008

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2969037

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title = "Effects of hydrogen anneals on oxygen deficient SrTiO3-x single crystals",

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.",

author = "Bharat Jalan and Roman Engel-Herbert and Mates, {Thomas E.} and Susanne Stemmer",

note = "Funding Information: The authors thank Dr. Anderson Janotti and Professor Chris van de Walle for useful discussions. The research was supported by the National Science Foundation through the UCSB MRL (Award No. DMR05-20415) and DMR (Award No. DMR-0602244). One author (R. E.-H.) thanks the Alexander von Humboldt Foundation for support through the Feodor Lynen program.",

year = "2008",

doi = "10.1063/1.2969037",

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journal = "Applied Physics Letters",

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T1 - Effects of hydrogen anneals on oxygen deficient SrTiO3-x single crystals

AU - Jalan, Bharat

AU - Engel-Herbert, Roman

AU - Mates, Thomas E.

AU - Stemmer, Susanne

N1 - Funding Information: The authors thank Dr. Anderson Janotti and Professor Chris van de Walle for useful discussions. The research was supported by the National Science Foundation through the UCSB MRL (Award No. DMR05-20415) and DMR (Award No. DMR-0602244). One author (R. E.-H.) thanks the Alexander von Humboldt Foundation for support through the Feodor Lynen program.

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

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JF - Applied Physics Letters

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ER -

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

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