Carrier mobility in nonstoichiometric n-Bi2Te3−x
Sex solid solutions |
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Authors: | V A Kutasov L N Luk’yanova P P Konstantinov G T Alekseeva |
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Institution: | (1) A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia |
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Abstract: | A study has been made of the thermoelectric and galvanomagnetic properties of n-Bi2Te3−x
Sex solid solutions (x=0.3 and 0.36) in the temperature range 80–300 K. The lowest carrier concentrations, (0.8–1)×1018 cm−3, were obtained by displacing the solid solution from the stoichiometric to a Te-rich composition. At such carrier concentrations,
the second subband in the conduction band of n-Bi2Te3−x
Sex is not filled, which results in a growth of mobility because of the absence of interband scattering, and brings about an
increase of thermoelectric efficiency in the 80–120-K range.
Fiz. Tverd. Tela (St. Petersburg) 39, 483–487 (March 1997) |
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