Thermoelectric Properties of Semimetal and Semiconductor Bi1 –xSbx Foils and Wires
| Autor: | L. A. Konopko, I. Gherghishan, V. Shepelevich, Piotr Stachowiak, S. Gusakova, Andrzej Jeżowski, Krzysztof Rogacki, A. A. Nikolaeva, V. Prokoshin |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Band gap business.industry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Semimetal Electronic Optical and Magnetic Materials Thermal conductivity Semiconductor Electrical resistivity and conductivity Seebeck coefficient 0103 physical sciences Thermoelectric effect Grain boundary 0210 nano-technology business |
| Zdroj: | Semiconductors. 53:657-661 |
| ISSN: | 1090-6479 1063-7826 |
| DOI: | 10.1134/s1063782619050191 |
| Popis: | The results of experimental investigations into the thermoelectric properties (electrical conductivity, thermoelectric power, and thermal conductivity) of microtextured foils and single-crystal wires based on semimetal and semiconductor Bi1 –xSbx alloys are presented in the temperature range of 4.2–300 K. It is found that the band gap ΔE in Bi–17 at % Sb wires increases with decreasing wire diameter d, which is a manifestation of the quantum-size effect. At low temperatures (T < 50 K), in the wires with d < 400 nm, the electrical conductivity increases due to the significant contribution of highly conductive surface states characteristic of topological insulators. It is found for the first time that the thermal conductivity of semimetal Bi–3 at % Sb foils at low temperatures is two orders of magnitude lower, and that of semiconductor Bi–16 at % Sb foils one order of magnitude lower, than that in bulk samples of the corresponding composition due to significant phonon scattering at grain boundaries and surfaces. This effect leads to considerable enhancement of the thermoelectric figure-of-merit ZT and can be used in miniature low-temperature thermoelectric energy converters. |
| Databáze: | OpenAIRE |
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