| Autor: |
Guo, Kai, Zhang, Yuting, Yuan, Song, Tang, Qinghang, Lin, Chen, Luo, Pengfei, Yang, Jiong, Pan, Shusheng, Zhao, Li‐Dong, Cheng, Guofeng, Zhang, Jiye, Luo, Jun |
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| Zdroj: |
Angewandte Chemie International Edition; 1/16/2023, Vol. 62 Issue 3, p1-9, 9p |
| Abstrakt: |
Many Zintl phases are promising thermoelectric materials owning to their features like narrow band gaps, multiband behaviors, ideal charge transport tunnels, and loosely bound cations. Herein we show a new Zintl phase NaCdSb with exceptional intrinsic thermoelectric performance. Pristine NaCdSb exhibits semiconductor behaviors with an experimental hole concentration of 2.9×1018 cm−3 and a calculated band gap of 0.5 eV. As the temperature increases, the hole concentration rises gradually and approaches its optimal one, leading to a high power factor of 11.56 μW cm−1 K−2 at 673 K. The ultralow thermal conductivity is derived from the small phonon group velocity and short phonon lifetime, ascribed to the structural anharmonicity of Cd−Sb bonds. As a consequence, a maximum zT of 1.3 at 673 K has been achieved without any doping optimization or structural modification, demonstrating that NaCdSb is a remarkable thermoelectric compound with great potential for performance improvement. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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