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Direction-Dependent Thermoelectric Properties of a Layered Compound In2Te5 Single Crystal

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Abstract

We examine the anisotropic electrical and thermal transport properties in single crystals of In2Te5 belonging to the monoclinic space group C12/c1 with the temperature gradient applied parallel (||) and perpendicular (\(\perp \) ) to the crystallographic c-axis of the crystals. A systematic investigation of structural, electrical, and thermal properties suggests the role of layered structure in this material in guiding its thermoelectric behavior. The thermal conductivity along the c-axis (κ||c) was found to be smaller by a factor of 2 compared to the thermal conductivity along the direction perpendicular to the c-axis (κ\(_{\perp{c}}) \) over the entire temperature range. In contrast, the Seebeck coefficient along the c-axis (S||c) was found to be higher than its value along the direction perpendicular to the c-axis \((S_{\perp{c}}) \). At room temperature, the figure of merit zT||c is found to be four times larger as compared to the figure of merit \(zT_{{\perp}c} \). Our results provide insights into how the resistivity, thermal conductivity, and thermopower depends on the crystalline anisotropy and its impact on the overall zT.

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Acknowledgments

CVT would like to acknowledge the Department of Science and Technology for partial support through the project IR/S2/PU-10/2006.

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Authors and Affiliations

  1. Department of Physics, Pandit Deendayal Energy University, Raysan, Gandhinagar, 382007, India

    Anup V. Sanchela

  2. Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India

    Anup V. Sanchela & C. V. Tomy

  3. Department of Physics, Indian Institute of Technology Patna, Bihta, 801106, India

    Ajay D. Thakur

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  1. Anup V. Sanchela
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Correspondence to Anup V. Sanchela.

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Sanchela, A.V., Thakur, A.D. & Tomy, C.V. Direction-Dependent Thermoelectric Properties of a Layered Compound In2Te5 Single Crystal. J. Electron. Mater. 51, 2266–2272 (2022). https://doi.org/10.1007/s11664-022-09487-w

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