X-ray pole figure analysis of ZnTe layers grown on lattice mismatched substrates

Masakazu Kobayashi, Yuki Kumagai, Toshiaki Baba, Shota Imada

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    The electro-optical effect of ZnTe is recently highlighted, and various device structures utilizing ZnTe are explored. ZnTe substrates are recently commercially available, and high quality homoepitaxial layers can be grown. On the other hand, the cost of the substrate could be a concern for the practical device application. In this study, Si and Al 2O 3 substrates were used since they are widely used for many kinds of device applications. The lattice mismatch between those substrate materials and ZnTe is above 10% and those mismatch strain should be carefully considered. ZnTe layers were nucleated on chemically treated substrate surfaces. (111), (110), (211) oriented Si substrates and (0001), (11-20), and (10-10) planes of Al 2O 3 were used. By taking the pole figure data and studying the crystal symmetry of the domain, detail information associated with the formation of domains in the layer was discussed. The pole figure analysis revealed that several kinds of (110) oriented ZnTe domains rotated 60 degrees each other were formed on (110) oriented Si surface. On the other hand, preferentially oriented single domain of (111) was confirmed for the layer grown on the (0001) plane of Al 2O 3. ZnTe layers grown on (10-10) plane Al 2O 3exhibited a unique domain formation. Pole figure data combined with the conventional theta-2theta measurement indicated that (211) oriented plane of ZnTe was a dominant domain formed on the (10-10) plane Al 2O 3. These crystallographic features would be related to the interface valency as well as the interfacial bond structure. X-ray pole figure method was a useful and powerful method to study the domain formation of the severely lattice mismatched structures.

    Original languageEnglish
    Pages (from-to)1748-1751
    Number of pages4
    JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
    Volume9
    Issue number8-9
    DOIs
    Publication statusPublished - 2012 Aug

    Fingerprint

    poles
    x rays
    electro-optical effect
    costs
    symmetry
    crystals

    Keywords

    • Heteroepitaxy
    • Molecular beam epitaxy
    • Pole figure
    • ZnTe

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    X-ray pole figure analysis of ZnTe layers grown on lattice mismatched substrates. / Kobayashi, Masakazu; Kumagai, Yuki; Baba, Toshiaki; Imada, Shota.

    In: Physica Status Solidi (C) Current Topics in Solid State Physics, Vol. 9, No. 8-9, 08.2012, p. 1748-1751.

    Research output: Contribution to journalArticle

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