Single-Crystal SnSe Thermoelectric Fibers via Laser-Induced Directional Crystallization: From 1D Fibers to Multidimensional Fabrics
Single-Crystal SnSe Thermoelectric Fibers via Laser-Induced Directional Crystallization: From 1D Fibers to Multidimensional Fabrics
复制标题
通过激光诱导定向结晶的单晶 SnSe 热电纤维：从一维纤维到多维织物
DOI：
10.1002/adma.202002702
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发表时间：
2020-07-26
影响因子：
29.4
通讯作者：
Wei, Lei
中科院分区：
文献类型：
--
作者：
Zhang, Jing;Zhang, Ting;Wei, Lei
单晶硒化锡（SnSe）是高性能热电材料的记录保持者保持器，可实现高效的热电转换，用于发电或制冷。然而，刚性笨重的SnSe不能满足柔性和可穿戴设备的应用。在这里，一种方法被证明是实现超长单晶SnSe线与岩盐结构和高热电性能的直径从微米到纳米级。这种方法从将SnSe热拉伸成柔性纤维状衬底开始，该衬底是多晶的、高度柔性的、超长的和机械稳定的。然后，采用CO（2）激光器在整个光纤上将SnSe芯重结晶为单晶。理论和实验研究表明，单晶岩盐SnSe纤维具有较高的热电性能，在862 K时ZT值显著提高到2。这种简单且低成本的方法为将纤维状单晶材料应用于从一维纤维设备到多维可穿戴织物的应用提供了一条有前途的途径。
Single-crystal tin selenide (SnSe), a record holder of high-performance thermoelectric materials, enables high-efficient interconversion between heat and electricity for power generation or refrigeration. However, the rigid bulky SnSe cannot satisfy the applications for flexible and wearable devices. Here, a method is demonstrated to achieve ultralong single-crystal SnSe wire with rock-salt structure and high thermoelectric performance with diameters from micro- to nanoscale. This method starts from thermally drawing SnSe into a flexible fiber-like substrate, which is polycrystalline, highly flexible, ultralong, and mechanically stable. Then a CO(2)laser is employed to recrystallize the SnSe core to single-crystal over the entire fiber. Both theoretical and experimental studies demonstrate that the single-crystal rock-salt SnSe fibers possess high thermoelectric properties, significantly enhancing theZTvalue to 2 at 862 K. This simple and low-cost approach offers a promising path to engage the fiber-shaped single-crystal materials in applications from 1D fiber devices to multidimensional wearable fabrics.