Abstract
The spectral dependences of the absorption coefficient α are investigated in (Pb0.78Sn0.22)1–x In x Te at T = 300 K, with the content of indium in the mix x = 0.001–0.050. Two additional-absorption lines exhibiting sharp red margins are found in the α(ħω) spectra from all the specimens examined. It is shown that they are associated with the optical ionization of the sites, whose energy levels E 0 and E 1are located in the forbidden band. It is established that the energy parameters of the E 0 and E 1 bands (position of the maxima of the state density function and the half width) do not depend on x. It is demonstrated that the E 0 band is accounted for by indium located in the sublattice sites. It is found out that the indium concentration in the sites differs from its content in the mix. No changes testifying to the hopping conduction via the impurity states of indium are found in the energy spectrum from (Pb0.78Sn0.22)1–x In x Te.
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Weis, A.N. Optical Absorption in (Pb0.78Sn0.22)1–x In x Te. Russian Physics Journal 46, 351–355 (2003). https://doi.org/10.1023/A:1025715723901
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DOI: https://doi.org/10.1023/A:1025715723901