Tuning of thermoelectric properties with changing Se content in Sb2Te3
| Autor: | D. Das, K. Malik, A. K. Deb, V. A. Kulbachinskii, V. G. Kytin, S. Chatterjee, S. Dhara, S. Bandyopadhyay, A. Banerjee |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Condensed Matter - Materials Science Materials science Condensed matter physics Scattering Phonon Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Boltzmann equation Condensed Matter::Materials Science symbols.namesake Electrical resistivity and conductivity Condensed Matter::Superconductivity Seebeck coefficient 0103 physical sciences Thermoelectric effect symbols Condensed Matter::Strongly Correlated Electrons Crystallite 0210 nano-technology Raman spectroscopy |
| Popis: | Polycrystalline Sb 2 Te 3-x Se x (0.0 < x < 1.0) samples were synthesized by the solid state reaction method. The structural analysis showed that up to the maximal concentration of Se, the samples possess the Rhombohedral crystal symmetry (space group R 3 m ). Increase of Se content increases the resistivity of the samples. Variation of phonon frequencies, observed from Raman spectroscopic study, depict anomalous behaviour around x = 0.2. The sample Sb 2 Te 2.8 Se 0.2 also shows maximum Seebeck coefficient, carrier concentration and thermoelectric power factor. Nature of scattering mechanism controlling the thermopower data has been explored. The thermoelectric properties of the synthesized materials have been analyzed theoretically in the frame of Boltzmann equation approach. Accepted for publication in Europhysics Letters |
| Databáze: | OpenAIRE |
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