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High crystal quality wurtzite-zinc blende heterostructures in metal-organic vapor phase epitaxy-grown GaAs nanowires

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Abstract

We have prepared GaAs wurtzite (WZ)-zinc blende (ZB) nanowire heterostructures by Au particle-assisted metal-organic vapor phase epitaxy (MOVPE) growth. Superior crystal quality of both the transition region between WZ and ZB and of the individual segments themselves was found for WZ-ZB single heterostructures. Pure crystal phases were achieved and the ZB segments were found to be free of any stacking defects, whereas the WZ sections showed a maximum stacking fault density of 20 μm−1. The hexagonal cross-sectional wires are terminated by \(\left\{ {10\bar 10} \right\}\)-type side facets for the WZ segment and predominantly {110}-type side facets for the ZB part of the wire. A diameter increase occurred after the transition from WZ to ZB. Additionally, facets of the \(\left\{ {\bar 1\bar 1\bar 1} \right\}\)-type as well as downwards-directed overgrowth of the WZ segments were formed at the WZ to ZB transition to compensate for the observed diameter increase and facet rotation. In the case of WZ-ZB multiple heterostructures, we observed slightly higher densities of stacking faults and twin planes compared to single heterostructures.

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Authors and Affiliations

  1. Solid State Physics, Lund University, Box 118, S-221 00, Lund, Sweden

    Sebastian Lehmann, Daniel Jacobsson, Knut Deppert & Kimberly A. Dick

  2. Polymer & Materials Chemistry, Lund University, Box 124, S-221 00, Lund, Sweden

    Kimberly A. Dick

Authors
  1. Sebastian Lehmann
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  2. Daniel Jacobsson
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  3. Knut Deppert
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  4. Kimberly A. Dick
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Correspondence to Sebastian Lehmann.

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Lehmann, S., Jacobsson, D., Deppert, K. et al. High crystal quality wurtzite-zinc blende heterostructures in metal-organic vapor phase epitaxy-grown GaAs nanowires. Nano Res. 5, 470–476 (2012). https://doi.org/10.1007/s12274-012-0232-3

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  • DOI: https://doi.org/10.1007/s12274-012-0232-3

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