Complex alloying effect on thermoelectric transport properties of Cu2Ge(Se(1-x)Tex)3

作     者：Ruifeng Wang Lu Da Yanci Yan Kunling Peng Xu Lu Xiaoyuan Zhou and Guoyu Wang 王瑞峰;戴璐;闫艳慈;彭坤岭;卢旭;周小元;王国玉

作者机构：Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China College of Physics Chongqing University Chongqing gO 1331 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2018年第27卷第6期

页      面：376-381页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51672270,11674040,and 11404044) the Key Research Program of Frontier Sciences,Chinese Academy of Sciences(Grant No.QYZDB-SSW-SLH016) the Project for Fundamental and Frontier Research in Chongqing City(Grant No.CSTC2015JCYJBX0026) 

主　　题：thermoelectric Cu2GeSe3 alloying distorted structure 

摘      要：To enhance the thermoelectric performance of Cu2GeSe3, a series of Te-alloyed samples Cu2Ge（Se（1-x）Tex）3 are synthesized and investigated in this work. It is found that the lattice thermal conductivity is reduced drastically for x = 0.1 sample, which may be attributed to the point defects introduced by alloying. However, for samples with x ≥ 0.2, the lattice thermal conductivity increases with increasing x, which is related to a less distorted structure. The structure evolution,together with the change in carrier concentration, also leads to a systemically change in electrical properties. Finally, a z T of 0.55@750 K is obtained for the sample with x = 0.3, about 62% higher than that for the pristine sample.