Two-electron exchange between neutral and ionized negative-U tin centers in lead chalcogenides
А. В. МарченкоGertsen State Pedagogical University, nab. Moiki 48, St. Petersburg, 191186, RussiaК. У. БобохужаевUlugbek National University of Uzbekistan, Vuzgorodok, Tashkent, 700095, UzbekistanА. Б. ЖаркойGertsen State Pedagogical University, nab. Moiki 48, St. Petersburg, 191186, RussiaА. В. НиколаеваGertsen State Pedagogical University, nab. Moiki 48, St. Petersburg, 191186, RussiaП. П. СерегинGertsen State Pedagogical University, nab. Moiki 48, St. Petersburg, 191186, Russia
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Two-electron exchange between neutral and doubly ionized negative-U tin centers in PbS and PbSe has been studied by Mössbauer emission spectroscopy. The activation energy for this process in PbS is 0.11(2) eV, which is comparable to the depth of tin levels in the band gap of PbS, whereas the activation energy for this process in PbSe, 0.05(1) eV, is comparable to the correlation energy of negative-U donor tin centers in PbSe. The exchange occurs through simultaneous transfer of two electrons and involves valence band states.
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