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Electron exchange between tin impurity U – centers in PbS z Se1–z alloys

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Abstract

Using emission 119mmSn(119mSn) and 119Sb(119mSn) Mössbauer spectroscopy, it is shown that impurity tin atoms in PbS z Se1–z alloys substitute lead atoms and are two-electron donors with negative correlation energy (U – centers). It is found that the energy levels related to impurity tin atoms are in the lower half of the band gap at z ≥ 0.5 against the background of allowed valence-band states at z ≤ 0.4. The electron exchange between neutral and doubly ionized tin U – centers in partially compensated Pb0.99Sn0.005Na0.005S z Se1–z alloys is studied. The activation energy of this process decreases from 0.111(5) eV for a composition with z = 1 to 0.049(5) eV for compositions with c ≤ 0. For all z, the exchange is implemented via the simultaneous transfer of two electrons using delocalized valence-band states.

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Authors and Affiliations

  1. Alexander Herzen State Pedagogical University of Russia, ul. Moika 48, St. Petersburg, 191186, Russia

    A. V. Marchenko, P. P. Seregin, A. N. Rasnjuk & V. S. Kiselev

  2. Ioffe Physical–Technical Institute, Russian Academy of Sciences, ul. Politekhnicheskaya 26, St. Petersburg, 194021, Russia

    E. I. Terukov

Authors
  1. A. V. Marchenko
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  2. E. I. Terukov
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  3. P. P. Seregin
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  4. A. N. Rasnjuk
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  5. V. S. Kiselev
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Corresponding author

Correspondence to P. P. Seregin.

Additional information

Original Russian Text © A.V. Marchenko, E.I. Terukov, P.P. Seregin, A.N. Rasnjuk, V.S. Kiselev, 2016, published in Fizika i Tekhnika Poluprovodnikov, 2016, Vol. 50, No. 7, pp. 893–899.

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Marchenko, A.V., Terukov, E.I., Seregin, P.P. et al. Electron exchange between tin impurity U – centers in PbS z Se1–z alloys. Semiconductors 50, 876–882 (2016). https://doi.org/10.1134/S1063782616070149

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  • DOI: https://doi.org/10.1134/S1063782616070149

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