Two-electron exchange between neutral and ionized negative-U tin centers in lead chalcogenides

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 activa...

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Bibliographic Details
Published in:Inorganic materials 2016-05, Vol.52 (5), p.452-458
Main Authors: Marchenko, A. V., Bobokhuzhaev, K. U., Zharkoi, A. B., Nikolaeva, A. V., Seregin, P. P.
Format: Article
Language:English
Subjects:
Activation energy
Chalcogenides
Chemistry
Chemistry and Materials Science
Correlation
Exchange
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Inorganic materials
Ion exchange
Materials Science
Mossbauer effect
Valence band
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Summary: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.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168516050101