Reduction in low-temperature thermal conductivity of Cu2Se via substitution of Se by Te atoms

Mangavati, Suraj and Pal, Anand and Rao, Ashok and Jiang, Zhao-Ze and Kuo, Yung-Kango (2022) Reduction in low-temperature thermal conductivity of Cu2Se via substitution of Se by Te atoms. Journal of Physics and Chemistry of Solids, 160. ISSN 0022-3697

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We report the structural and thermoelectric properties of the Cu2Se compound with a systematic substitution of Se by Te atom. The bulk polycrystalline Cu2Se1-xTex samples for the Te concentrations of x = 0.00, 0.02, 0.04, 0.06, and 0.08 were prepared by the solid-state reaction method. The room-temperature XRD studies revealed that the studied samples possess a monoclinic crystal structure. The oxidation state and electronic structure are confirmed by employing X-ray photoemission spectroscopy (XPS). The hardness of the samples increased sys�tematically with an increase in Te doping concentration. The electrical resistivity of the doped samples was found to be increased in comparison to the pure sample. The Seebeck coefficient was positive throughout the tem�perature range under investigation, indicating that holes are the majority charge carriers in the studied com�pounds. The thermal conductivity of the doped samples decreased, which is presumably attributed to the point defect scattering. The systematic evolution of thermoelectric properties via substitution of Se by Te over the range (0.00 ≤ x ≤ 0.08) concludes that the overall thermoelectric power factor (PF) and figure of merit (ZT) decrease with Te substitution compared to the pristine Cu2Se compound.

Item Type: Article
Uncontrolled Keywords: Thermoelectrics Rietveld refinement Thermal conductivity Electrical transport Figure of merit
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 12 Jul 2022 05:17
Last Modified: 12 Jul 2022 05:17

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