Oxygen polarity and interfacial atomic arrangement in an Mg xZn1-xO/C-MgO/sapphire heterostructure

Xiang He, Lin Gu, Sandong Guo, Zhanglong Liu, Richeng Yu, Zengxia Mei, Xiaolong Du, Banggui Liu, Yuichi Ikuhara, Xiaofeng Duan

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    5 Citations (Scopus)

    Abstract

    Oxygen polarity and interfacial structure of an Mg0.55Zn0.45O/ Mg0.17Zn0.83O/MgO/sapphire heterostructure were determined by electron energy-loss spectroscopy and aberration-corrected scanning transmission electron microscopy. It was found that O-polarity occurs by an uncommon mechanism in the MgxZn1-xO film with a 0.5 nm-thick compressively strained rocksalt MgO buffer; and that the ∼18% lattice mismatch between Mg0.17Zn0.83O and sapphire is mostly accommodated by misfit dislocations at the Mg0.17Zn 0.83O/MgO interface. Density functional theory calculations indicate that the MgO buffer strongly tends to manifest a rocksalt structure rather than wurtzite. Zn substitution of the topmost Mg atoms in the MgO buffer is likely to induce such O-polarity.

    Original languageEnglish
    Article number145303
    JournalJournal of Physics D: Applied Physics
    Volume46
    Issue number14
    DOIs
    Publication statusPublished - 2013 Apr 10

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Acoustics and Ultrasonics
    • Surfaces, Coatings and Films

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