环保型p型CuSnS热电材料：晶体结构与输运性质
Eco-friendly p-type CuSnS thermoelectric material: crystal structure and transport properties.
作者信息
Shen Yawei, Li Chao, Huang Rong, Tian Ruoming, Ye Yang, Pan Lin, Koumoto Kunihito, Zhang Ruizhi, Wan Chunlei, Wang Yifeng
机构信息
Nanjing Tech University, College of Materials Science and Engineering, Nanjing 210009, China.
East China Normal University, Key Laboratory of Polar Materials and Devices, Shanghai 200062, China.
出版信息
Sci Rep. 2016 Sep 26;6:32501. doi: 10.1038/srep32501.
As a new eco-friendly thermoelectric material, copper tin sulfide (CuSnS) ceramics were experimentally studied by Zn-doping. Excellent electrical transport properties were obtained by virtue of 3-dimensionally conductive network for holes, which are less affected by the coexistence of cubic and tetragonal phases that formed upon Zn subsitition for Sn; a highest power factors ~0.84 mW m K at 723 K was achieved in the 20% doped sample. Moreover, an ultralow lattice thermal conductivity close to theoretical minimum was observed in these samples, which could be related to the disordering of atoms in the coexisting cubic and tetragonal phases and the interfaces. Thanks to the phonon-glass-electron-crystal features, a maximum ZT ~ 0.58 was obtained at 723 K, which stands among the tops for sulfide thermoelectrics at the same temperature.
作为一种新型的环保热电材料，通过锌掺杂对硫化铜锡（CuSnS）陶瓷进行了实验研究。借助三维空穴导电网络获得了优异的电输运性能，该网络受锌取代锡时形成的立方相和四方相共存的影响较小；在20%掺杂的样品中，在723 K时实现了最高功率因子0.84 mW m⁻¹ K⁻²。此外，在这些样品中观察到了接近理论最小值的超低晶格热导率，这可能与共存的立方相和四方相以及界面中原子的无序排列有关。由于具有声子玻璃-电子晶体特性，在723 K时获得了最大ZT值0.58，在相同温度下，该值在硫化物热电材料中名列前茅。
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