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 ...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.展开更多
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)
文摘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.
