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Instability and Surface Potential Modulation of Self-Patterned (001)SrTiO3 Surfaces

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    Instability and Surface Potential Modulation of Self-Patterned (001)SrTiO3 Surfaces
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    † ALBA Synchrotron Light Facility, Carretera BP 1413, Km. 3.3, 08290 Cerdanyola del Vallès, Barcelona, Spain
    ‡ Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Barcelona, Spain
    *E-mail: [email protected]
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    Chemistry of Materials

    Cite this: Chem. Mater. 2015, 27, 18, 6198–6204
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    https://doi.org/10.1021/acs.chemmater.5b00661
    Published August 13, 2015
    Copyright © 2015 American Chemical Society
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    Abstract

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    The (001)SrTiO3 crystal surface can be engineered to display a self-organized pattern of well-separated and nearly pure single-terminated SrO and TiO2 regions by high temperature annealing in oxidizing atmosphere. By using surface sensitive techniques we have obtained evidence of such a surface chemical self-structuration in as-prepared crystals and unambiguously identified the local composition. The contact surface potential at regions initially consisting of majority single terminations (SrO and TiO2) is determined to be Φ(SrO) < Φ(TiO2), in agreement with theoretical predictions, although the measured difference ΔΦ ≤ 100 meV is definitely below calculations for ideally pure single-terminated SrO and TiO2 surfaces. These relative values are maintained if samples are annealed in UHV up to 200 °C. Annealing in UHV at higher temperature (400 °C) preserves the surface morphology of self-assembled TiO2 and SrO rich regions, although a non-negligible chemical intermixing is observed. The most dramatic consequence is that the surface potential contrast is reversed. It thus follows that electronic and chemical properties of (001)SrTiO3 surfaces, widely used in oxide thin film growth, can largely vary before growth starts in a manner strongly dependent on temperature and pressure conditions.

    Copyright © 2015 American Chemical Society

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    This article is cited by 15 publications.

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    Chemistry of Materials

    Cite this: Chem. Mater. 2015, 27, 18, 6198–6204
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.chemmater.5b00661
    Published August 13, 2015
    Copyright © 2015 American Chemical Society
    Request reuse permissions

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