Progressive Regulation of Electrical and Thermal Transport Properties to High-Performance CuInTe2 Thermoelectric Materials
Progressive Regulation of Electrical and Thermal Transport Properties to High-Performance CuInTe2 Thermoelectric Materials
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高性能 CuInTe2 热电材料电和热传输特性的渐进调控
DOI：
10.1002/aenm.201600007
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发表时间：
2016-06-22
影响因子：
27.8
通讯作者：
He, Xu
中科院分区：
文献类型：
--
作者：
Luo, Yubo;Yang, Junyou;He, Xu
p型CuInTe 2热电（TE）材料由于其环境友好的化学成分和在工作温度下的稳定相而在中温范围内的应用中引起极大兴趣。为了提高它们的TE性能，以与基于Pb的TE材料竞争，在这项工作中已经采用了电和热输运性质的渐进调节。第一次用阴离子P和Sb取代来调节CuInTe 2的电输运性质，由于受主掺杂降低了电阻率，导致功率因数的急剧提高，以及由于态密度的提高而导致的Seebeck系数的增加。同时，通过CuInTe 2和ZnO添加剂之间的原位氧化引入In 2 O3纳米夹杂物，通过额外的声子散射使CuInTe 2的热导率大大降低。然后，通过整合的阴离子取代和纳米夹杂物，一个高的功率因数为1445 μ W m（-1）K-2和增强ZT为1.61在823 K的CuInTe 2基TE材料实现。这意味着通过阴离子取代和原位纳米结构的协同调节电和热输运性质是改善CuInTe 2化合物TE性能的非常有效的途径。
p-type CuInTe2 thermoelectric (TE) materials are of great interest for applications in the middle temperature range because of their environmentally benign chemical component and stable phase under operating temperatures. In order to enhance their TE performance to compete with the Pb based TE materials, a progressive regulation of electrical and thermal transport properties has been employed in this work. Anion P and Sb substitution is used to tune the electrical transport properties of CuInTe2 for the first time, leading to a sharp enhancement in power factor due to the reduction of electrical resistivity by acceptor doping and the increase of the Seebeck coefficient resulted from the improvement of density of states. Concurrently, In2O3 nanoinclusions are introduced through an in situ oxidation between CuInTe2 and ZnO additives, rendering a great reduction in the thermal conductivity of CuInTe2 by the extra phonon scattering. Then, by integrating the anion substitution and nanoinclusions, a high power factor of 1445 mu W m(-1) K-2 and enhanced ZT of 1.61 at 823 K are achieved in the CuInTe2 based TE material. This implies that the synergistic regulation of electrical and thermal transport properties by anion substitution and in situ nanostructure is a very effective approach to improve the TE performance of CuInTe2 compounds.