Abstract
Using emission 119mmSn(119mSn) and 119Sb(119mSn) Mossbauer 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.
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