Interfacial defect complex at the MgO/SrTiO3 heterojunction and its electronic impact

Junjie Li, Shuhui Lv, Chunlin Chen, Sumei Huang, Zhongchang Wang

    研究成果: Article査読

    8 被引用数 (Scopus)

    抄録

    Atomic defects exist in various heterojunctions and can remarkably affect their properties, yet it remains a challenging task to identify each individual defect. Here, by combining advanced transmission electron microscopy, spectroscopy and first-principles calculations, we obtain a structural and element-selective imaging of defects at an interface between MgO and SrTiO3. We demonstrate that even for structurally simple MgO and SrTiO3, their interface involves a defect complex comprising of substitutional Ti and Mg vacancies, which induce a marked shift in electronic states. The Ti atoms diffused into MgO exhibit a valence state of +4 and a certain degree of covalency to the surrounding oxygen. Such an ability to determine defects allows us to precisely alter heterojunctions so as to critically improve the device performances.

    本文言語English
    ページ(範囲)51002-51007
    ページ数6
    ジャーナルRSC Advances
    4
    92
    DOI
    出版ステータスPublished - 2014

    ASJC Scopus subject areas

    • 化学 (全般)
    • 化学工学(全般)

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