Unit Cell Structure of Crystal Polytypes in InAs and InSb Nanowires

Dominik Kriegner, Christian Panse, Bernhard Mandl, Kimberly A. Dick, Mario Keplinger, Johan Mikael Persson, Philippe Caroff, Daniele Ercolani, Lucia Sorba, Friedhelm Bechstedt, Julian Stangl, Günther Bauer

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The atomic distances in hexagonal polytypes of III−V compound semiconductors differ from the values expected from simply a change of the stacking sequence of (111) lattice planes. While these changes were difficult to quantify so far, we accurately determine the lattice parameters of zinc blende, wurtzite, and 4H polytypes for InAs and InSb nanowires, using X-ray diffraction and transmission electron microscopy. The results are compared to density functional theory calculations. Experiment and theory show that the occurrence of hexagonal bilayers tends to stretch the distances of atomic layers parallel to the c axis and to reduce the in-plane distances compared to those in zinc blende. The change of the lattice parameters scales linearly with the hexagonality of the polytype, defined as the fraction of bilayers with hexagonal character within one unit cell.
    Original languageEnglish
    JournalNano Letters
    Volume11
    Issue number4
    Pages (from-to)1483-1489
    ISSN1530-6984
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Density functional theory
    • Crystal structure
    • Nanowires
    • Polytypes
    • X-ray diffraction

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