1. Thermoelectric performance of ternary Cu-based chalcogenide Cu2TiTe3.
- Author
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Xiong, Yifei, Jin, Zhicheng, Deng, Tingting, Qiu, Pengfei, Xi, Lili, Yang, Jiong, Shi, Xun, and Chen, Lidong
- Subjects
CHALCOGENIDES ,FREQUENCIES of oscillating systems ,THERMOELECTRIC materials ,VALENCE bands ,OCTAHEDRA ,QUALITY factor - Abstract
In this work, we report the ternary Cu-based chalcogenide, Cu
2 TiTe3 , 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 Cu2 TiTe3 . Likewise, Cu2 TiTe3 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 Cu2 TiTe3 at 600 K. [ABSTRACT FROM AUTHOR]- Published
- 2023
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