硫系化合物
三元运算
材料科学
热电效应
功勋
凝聚态物理
热电材料
大气温度范围
热导率
光电子学
热力学
物理
复合材料
计算机科学
程序设计语言
作者
Yifei Xiong,Zhicheng Jin,Tingting Deng,Pengfei Qiu,Lili Xi,Jiong Yang,Xun Shi,Lidong Chen
摘要
In this work, we report the ternary Cu-based chalcogenide, Cu2TiTe3, as a promising thermoelectric material in middle-temperature range. The bonding interaction between Te p and Ti d states is observed in the Ti–Te octahedron, which drives the side bands up converging with Γ band, yielding a high valence band degeneracy of 5. A high electronic quality factor of 2.2 μW cm−1 K−2 and a decent power factor of 7.5 μW cm−1 K−2 at 300 K are achieved for Cu2TiTe3. Likewise, Cu2TiTe3 demonstrates low lattice thermal conductivity throughout the measured temperature range, which is attributed to the low frequency vibration related to the global motion of Ti–Te–Cu clusters. Finally, a maximum figure-of-merit of 0.38 was obtained for Cu2TiTe3 at 600 K.
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