High performance of n-type (PbS)1-x-y(PbSe)x(PbTe)y thermoelectric materials
| Autor: | Minghui Zhao, Li-Dong Zhao, Cheng Chang, Yu Xiao |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Phonon business.industry Scattering Mechanical Engineering Doping Metals and Alloys 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Thermoelectric materials 01 natural sciences Crystallographic defect 0104 chemical sciences Thermal conductivity Mechanics of Materials Phase (matter) Thermoelectric effect Materials Chemistry Optoelectronics 0210 nano-technology business |
| Zdroj: | Journal of Alloys and Compounds. 744:769-777 |
| ISSN: | 0925-8388 |
| Popis: | Te-free PbS has been regarded as a promising alternative candidate for PbTe thermoelectric materials due to its advances of low-cost, earth-abundant. In this work, we report an enhanced thermoelectric performance in n-type PbS system arising from synergistically optimized carrier and phonon transport properties. The electrical transport properties are optimized by tuning carrier concentrations via Sb doping, resulting in a maximum power factor of ∼16.7 μWcm−1K−2 at 623 K, which is approximately tenfold higher than that of undoped PbS (∼1.8 μWcm−1K−2). PbSe and PbTe co-alloying in PbS was carried out to reduce lattice thermal conductivity through introducing point defects scattering and second phase, resulting in a minimum lattice thermal conductivity ∼0.71 Wm−1K−1 at 923 K. Combined the enhanced power factor with suppressed thermal conductivity, a maximum ZT value ∼1.0 was obtained in n-type (PbS)0.53(PbSe)0.25(PbTe)0.2Sb0.02 at 923 K. |
| Databáze: | OpenAIRE |
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