Abstract
It is shown using Mössbauer spectroscopy on the isotope 119Sn that an isovalent tin impurity in the solid solutions PbS1−z Se z is a two-electron donor with negative correlation energy. The energy levels associated with the tin impurity are found in the lower half of the band gap for z<0.7 and are found among the allowed states of the valence band for z>0.7. We have demonstrated electron transfer between neutral and ionized tin centers. The activation energy E o of this process decreases monotonically as z is increased, which reflects the fact that the tin energy levels move toward the top of the valence band, and for z>0.7 the activation energy is E o =U/2, where U is the Hubbard energy.
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Fiz. Tekh. Poluprovodn. 31, 291–295 (February 1997)
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Masterov, V.F., Nasredinov, F.S., Nemov, S.A. et al. Two-electron tin centers with negative correlation energy in lead chalcogenides. Determination of the Hubbard energy. Semiconductors 31, 181–185 (1997). https://doi.org/10.1134/1.1187103
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DOI: https://doi.org/10.1134/1.1187103