Electron exchange between tin impurity U– centers in PbSzSe1–z alloys
- Authors: Marchenko A.V.1, Terukov E.I.2, Seregin P.P.1, Rasnjuk A.N.1, Kiselev V.S.1
-
Affiliations:
- Alexander Herzen State Pedagogical University of Russia
- Ioffe Physical–Technical Institute
- Issue: Vol 50, No 7 (2016)
- Pages: 876-882
- Section: Electronic Properties of Semiconductors
- URL: https://journals.rcsi.science/1063-7826/article/view/197364
- DOI: https://doi.org/10.1134/S1063782616070149
- ID: 197364
Cite item
Abstract
Using emission 119mmSn(119mSn) and 119Sb(119mSn) Mössbauer spectroscopy, it is shown that impurity tin atoms in PbSzSe1–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 Pb0.99Sn0.005Na0.005SzSe1–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.
About the authors
A. V. Marchenko
Alexander Herzen State Pedagogical University of Russia
Email: ppseregin@mail.ru
Russian Federation, ul. Moika 48, St. Petersburg, 191186
E. I. Terukov
Ioffe Physical–Technical Institute
Email: ppseregin@mail.ru
Russian Federation, ul. Politekhnicheskaya 26, St. Petersburg, 194021
P. P. Seregin
Alexander Herzen State Pedagogical University of Russia
Author for correspondence.
Email: ppseregin@mail.ru
Russian Federation, ul. Moika 48, St. Petersburg, 191186
A. N. Rasnjuk
Alexander Herzen State Pedagogical University of Russia
Email: ppseregin@mail.ru
Russian Federation, ul. Moika 48, St. Petersburg, 191186
V. S. Kiselev
Alexander Herzen State Pedagogical University of Russia
Email: ppseregin@mail.ru
Russian Federation, ul. Moika 48, St. Petersburg, 191186