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Reasons of Crystallite Formation during the Self-Catalyzed GaAs Nanowire Growth

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Abstract

During the self-catalyzed GaAs nanowire growth formation of parasitic GaAs crystallites is observed. The reasons for crystallite formation are explained on the base of Monte Carlo simulation results. During simultaneous deposition of gallium and arsenic on the GaAs(111)B substrate coated by a silicon oxide film, liquid gallium droplets nucleate on the oxide surface. After nucleation, droplets enlarge in size with time and etch the oxide layer. Formation of GaAs crystal structures becomes possible only after the Ga droplet contacts underlying crystal substrate. It is shown that excessively high arsenic and gallium deposition rates lead to the crystallite formation at the initial growth stage. The GaAs crystallites collect part of the deposited gallium and arsenic decreasing their surface concentration, thereby, adjusting the growth conditions for the nanowire growth. Therefore, during the self-catalyzed GaAs nanowire growth the self-regulation of growth conditions takes place.

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ACKNOWLEDGMENTS

We are grateful to T. Gavrilova for acquiring SEM micrographs.

Funding

This work was supported by the Russian Foundation for Basic Research (grant 18-02-00764).

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Authors and Affiliations

  1. Rzhanov Institute of Semiconductor Physics, SB RAS, 630090, Novosibirsk, Russia

    A. G. Nastovjak, N. L. Shwartz, E. A. Emelyanov, M. O. Petrushkov, A. V. Vasev, M. A. Putyato & V. V. Preobrazhenskii

  2. Novosibirsk State Technical University, 630073, Novosibirsk, Russia

    N. L. Shwartz

Authors
  1. A. G. Nastovjak
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  2. N. L. Shwartz
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  3. E. A. Emelyanov
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  4. M. O. Petrushkov
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  5. A. V. Vasev
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  6. M. A. Putyato
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  7. V. V. Preobrazhenskii
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Corresponding authors

Correspondence to A. G. Nastovjak, N. L. Shwartz, E. A. Emelyanov, M. O. Petrushkov, A. V. Vasev, M. A. Putyato or V. V. Preobrazhenskii.

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Nastovjak, A.G., Shwartz, N.L., Emelyanov, E.A. et al. Reasons of Crystallite Formation during the Self-Catalyzed GaAs Nanowire Growth. Semiconductors 54, 1850–1853 (2020). https://doi.org/10.1134/S1063782620140213

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  • DOI: https://doi.org/10.1134/S1063782620140213

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