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Structural characterization of the epitaxially grown core–shell ZnTe/ZnMgTe nanowires
Institution:1. Institute of Physics, Polish Academy of Sciences, al. Lotnikow 32/46, PL-02668 Warszawa, Poland;2. HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg, Germany;1. Department of Physics, College of Science, University of Bahrain, P.O. Box 32038, Kingdom of Bahrain;2. Nanotechnology Centre, University of Bahrain, P.O. Box 32038, Kingdom of Bahrain;1. Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea;2. The Makineni Theoretical Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, United States;3. Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea;1. Institute of High Pressures Physics, UNIPRESS, 01-142 Warsaw, Poland;2. Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark;1. Department of Electrical and Electronic Engineering, Saga University, Saga 840-8502, Japan;2. Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong;3. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;4. Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, CA 94720, USA;1. Crystal Growth Centre, Anna University, Chennai-600025, India;2. Physics Department, Faculty of Science-Al Faisaliah Campus, King Abdulaziz University, Saudi Arabia
Abstract:We report the method of the epitaxial growth of the core–shell ZnTe/ZnMgTe nanowires. The morphology and the crystal structure of several samples grown in different processes have been studied by scanning electron microscopy, high resolution transmission electron microscopy and X-ray diffraction methods. It was shown that the ZnMgTe shell growth was clearly epitaxial with a good crystal quality. The average lattice spacing of the ZnTe cores and ZnMgTe shells have been calculated and Mg content in the shells has been estimated. It was documented that growing the shell lattice mismatched to the core induces the strain in the core. The model of the strain creation mechanism has been proposed. The presence of a shell with a larger energy gap than that of the core results in a strong emission in the spectral region near the band edge.
Keywords:Synchrotron radiation  X-ray diffraction  Nanowires  MBE  II–VI Compounds
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