| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Nashchekina, Olga
National Technical University "Kharkiv Polytechnic Institute"
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2021Percolation effects and self-organization processes in cold-pressed Bi2(Te1−xSex)3 solid solutionscitations
- 2020Transport properties of the bismuth telluride thin films with different stoichiometry in the temperature range 77-300 Kcitations
- 2020Size effects and thermoelectric properties of Bi0.98Sb0.02 thin films
- 2020Percolation transition and physical properties of Bi1-xSbx solid solutions at low Bi concentrationcitations
- 2019Thickness-dependent quantum oscillations of the transport properties in bismuth selenide thin filmscitations
- 2019Effect of Deviation from Stoichiometry on Thermoelectric Properties of Bi₂Te₃ Polycrystals and Thin Films in the Temperature Range 77-300 Kcitations
- 2019Percolation effects and self-organization processes in Bi₂(Te₁₋ₓSeₓ)₃ solid solutionscitations
- 2018Structure of thermally evaporated bismuth selenide thin filmscitations
- 2017Heat capacity and microhardness of the topological crystalline insulator Pb₁₋ₓSnₓTe near the band inversion compositioncitations
- 2016Growth and structure of thermally evaporated Bi2Te3 thin filmscitations
Places of action
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article
Effect of Deviation from Stoichiometry on Thermoelectric Properties of Bi₂Te₃ Polycrystals and Thin Films in the Temperature Range 77-300 K
Abstract
Bi₂Te₃ semiconductor compound and Bi₂Te₃-based solid solutions are presently among the best lowtemperature thermoelectric materials. One of the methods of controlling the conductivity type and properties of Bi₂Te₃ is changing the stoichiometry of this compound. Earlier, we have obtained the room-temperature dependences of mechanical and thermoelectric properties of Bi₂Te₃ polycrystals on the degree of deviation from stoichiometry. The goal of this work is to investigate the behavior of such dependences at other temperatures. Bismuth telluride polycrystals with compositions in the range of 59.6-67.5 at. % Te were obtained, and for all the crystals the Seebeck coefficient, the Hall coefficient, electrical conductivity and charge carrier mobility were measured in the temperature range 77-300 K. On the basis of the temperature dependences, the isotherms of kinetic coefficients were plotted. It was found that similar to the room-temperature isotherms, the isotherms at lower temperatures were non-monotonic: they exhibited inversion of the conductivity sign between 60.5 and 61.0 at. % Te and extrema near 60.0 and 63.0 at. % Te. The experimental data are interpreted taking into account changes in the band and defect structures of Bi₂Te₃ under varying stoichiometry. The obtained results make it possible to control thermoelectric properties of Bi₂Te₃ polycrystals in the temperature range 77-300 K by changing the degree of deviation from stoichiometry.