He Shiyang, Li Yongbo, Liu Lu, Jiang Ying, Feng Jingjing, Zhu Wei, Zhang Jiye, Dong Zirui, Deng Yuan, Luo Jun, Zhang Wenqing, Chen Gang
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
Materials Genome Institute, Shanghai University, Shanghai 200444, China.
Sci Adv. 2020 Apr 10;6(15):eaaz8423. doi: 10.1126/sciadv.aaz8423. eCollection 2020 Apr.
Most crystalline inorganic materials, except for metals and some layer materials, exhibit bad flexibility because of strong ionic or covalent bonds, while amorphous materials usually display poor electrical properties due to structural disorders. Here, we report the simultaneous realization of extraordinary room temperature flexibility and thermoelectric performance in AgTe S -based materials through amorphization. The coexistence of amorphous main phase and crystallites results in exceptional flexibility and ultralow lattice thermal conductivity. Furthermore, the flexible AgTeS glass exhibits a degenerate semiconductor behavior with a room temperature Hall mobility of ~750 cm V s at a carrier concentration of 8.6 × 10 cm, which is at least an order of magnitude higher than other amorphous materials, leading to a thermoelectric power factor also an order of magnitude higher than the best amorphous thermoelectric materials known. The in-plane prototype uni-leg thermoelectric generator made from this material demonstrates its potential for flexible thermoelectric device.
除金属和一些层状材料外，大多数晶体无机材料由于存在强离子键或共价键而表现出较差的柔韧性，而非晶态材料通常由于结构无序而具有较差的电学性能。在此，我们报告了通过非晶化在基于AgTeS的材料中同时实现了非凡的室温柔韧性和热电性能。非晶主相和微晶的共存导致了卓越的柔韧性和超低的晶格热导率。此外，柔性AgTeS玻璃表现出简并半导体行为，在载流子浓度为8.6×10¹⁹ cm⁻³时，室温霍尔迁移率约为750 cm² V⁻¹ s⁻¹，这比其他非晶材料至少高一个数量级，导致其热电功率因子也比已知的最佳非晶热电材料高一个数量级。由这种材料制成的面内原型单腿热电发电机展示了其在柔性热电装置方面的潜力。
