Min Sun,Guowu Tang,Guoquan Qian,Wangwang Liu,Zhenguo Shi,Dongdan Chen,Qi Qian,Zhongmin Yang
In 4 Se 3 exhibits high thermoelectric performance as a typical example of semiconductors, which is a promising thermoelectric candidate for energy conversion applications. Here, InSe alloy core thermoelectric fibers with glass cladding were fabricated by a reactive molten core drawing method. The as-drawn fiber core was found to be InSe crystals as evidenced by X-ray diffraction. The In 4 Se 3 crystals were obtained in the fiber core by annealing the as-drawn fibers. The Seebeck coefficient of the In 4 Se 3 core fibers (−347 μV/K) was enhanced by ∼85% compared with that of the as-drawn InSe core fibers (−189 μV/K). This work constitutes a proof-of-concept that thermoelectric materials can be incorporated into fibers, which have promising applications in fiber-based thermoelectric devices.
The wide-bandgap cubic-structure semiconductor In 4 SnSe 4 can be regarded as a product of compositing two typical layered thermoelectric materials SnSe and In 4 Se 3 . Remarkably, In 4 SnSe 4 inherited low thermal conductivity from its parent materials. To advance the potential thermoelectric property of In 4 SnSe 4 , we systematically investigated its crystal structure and the origin of the intrinsic low thermal conductivity. In 4 SnSe 4 crystallized in a cubic phase (space group P a 3 ¯ ), with the lattice parameters of a = b = c = 12.66 Å. The anisotropy of In Se bonds in the lattice determined the complex structure of In 4 SnSe 4 with 72 atoms in the primitive cell. More importantly, sound velocity and elastic properties unclosed the strong anharmonicity in In 4 SnSe 4 , which contributed greatly to the low thermal conductivity. With first-principles calculations, it was found that the lone-pair electrons from In + mainly caused the anharmonicity in the lattice. Additionally, Br was proved to be an effective dopant for In 4 SnSe 4 to improve the electrical transport properties. This work indicated that the complex wide-bandgap semiconductor In 4 SnSe 4 with cubic phase and intrinsic low thermal conductivity was a new promising thermoelectric material with appropriate doping.
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