High thermoelectric performance in ZnSb-SnTe pseudo-binary materials
| Autor: | Yawen Zhang, Guoxiang Wang, Haizhou Shi, Chen Chen, Andriy Lotnyk |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Phase transition Nanocomposite Materials science Condensed matter physics Mechanical Engineering Metals and Alloys Nucleation 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences law.invention Mechanics of Materials law Electrical resistivity and conductivity Phase (matter) Seebeck coefficient 0103 physical sciences Thermoelectric effect General Materials Science Crystallization 0210 nano-technology |
| Zdroj: | Scripta Materialia. 194:113670 |
| ISSN: | 1359-6462 |
| DOI: | 10.1016/j.scriptamat.2020.113670 |
| Popis: | We examine the insulation–metal transition (IMT) behavior that occurs during dynamic phase-change processes in ZnSb-SnTe materials. This behavior can contribute to abnormally high thermoelectric performance, originating from IMT characteristics that regulate electrical transport. The 27.3 at% SnTe-doping reduces the phase transition temperature to approximately 214°C and realizes IMT in (ZnSb)72.7(SnTe)27.3 films. When a phase transition occurs, Sn atoms diffuse into ZnSb to form SnSb nano-crystallites within an amorphous matrix. This phase exhibits a typical IMT with dynamic critical characteristics accompanied by large fluctuations in chemical composition, nucleation modes, and phase boundaries. Hence, the nanoprecipitates formation and crystallization transition occurs in the nanocomposite structure. These features strongly influence carrier density and markedly improve electrical conductivity to retain the Seebeck coefficient, thereby leading to a high power factor of 3383 μWm–1K–2 at 300°C. Thus, (ZnSb)72.7(SnTe)27.3 is a robust thermoelectric candidate for energy conversion applications in low and moderate temperature ranges. |
| Databáze: | OpenAIRE |
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