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Electronic, Thermal, and Thermoelectric Properties of Ni-Doped FeTe2 Polycrystalline Alloys

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Abstract

Recently, transition metal dichalcogenides are being actively researched as thermoelectric materials. Among those, FeTe2 alloys exhibits both n-type and p-type conduction in different temperature range and thus their practicality as a thermoelectric material is somewhat limited. In this study, the effect of Ni addition on the electrical and thermal transport properties of FeTe2 was investigated by synthesizing a series of Ni-doped FeTe2 polycrystalline alloys. Fe1 − xNixTe2 (x = 0, 0.025, 0.05, 0.075, and 0.1). The electrical conductivity gradually increased from 323 S/cm (x = 0) to 688 S/cm (x = 0.1) at 300 K and from 905 S/cm (x = 0) to 1510 S/cm (x = 0.1) at 600 K. The change is mainly attributed to an increase in carrier concentration by the Ni doping. In addition, the Ni doping converted FeTe2 to an n-type conductor above 400 K. The power factor was increased to 0.11–0.15 mW/mK2 for the Ni-doped sample, compared to 0.05 mW/mK2 for FeTe2 at 600 K. The thermal conductivity decreased from 3.36 W/mK (x = 0) to 2.02 W/mK (x = 0.1) at 300 K owing to a significant decrease in lattice thermal conductivity resulting from point defect phonon scattering induced by Ni doping. Consequently, a maximum zT value of 0.029 at 600 K was observed for x = 0.075 in Fe1 − xNixTe2.which is more than 4-fold increase compared to zT of 0.0065 of FeTe2.

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Acknowledgements

This study was supported by the National Research Foundation of Korea (NRF-2019R1C1C1005254 and NRF-2022R1F1A1063054).

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  1. Young Bin An and Sang Jeong Park have contributed equally to this work.

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Seoul, Seoul, 02504, South Korea

    Young Bin An, Sang Jeong Park, Okmin Park, Se Woong Lee & Sang-il Kim

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  1. Young Bin An
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  2. Sang Jeong Park
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Correspondence to Sang-il Kim.

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An, Y.B., Park, S.J., Park, O. et al. Electronic, Thermal, and Thermoelectric Properties of Ni-Doped FeTe2 Polycrystalline Alloys. Electron. Mater. Lett. 19, 260–266 (2023). https://doi.org/10.1007/s13391-022-00396-y

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  • DOI: https://doi.org/10.1007/s13391-022-00396-y

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