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Enhancement in the thermoelectric properties of Cu3SbSe4 by Sn doping

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Abstract

The solid-state reaction technique was employed to fabricate Sn doped Cu3SbSe4 samples. The effect of doping on structural and thermoelectric properties of Cu3SbSe4 samples is represented in the present communication. The powder X-ray diffraction pattern of all the samples show that they have tetragonal structure (space group \(I\bar{4}2m\)). It is observed that doping Sn at Sb site acts as acceptor dopant which enhances hole concentration. The temperature dependent electrical resistivity (ρ(T)) is observed to decrease with increase in Sn concentration up to x = 0.03, thereafter ρ(T) increases with the increase in x concentration. To explore the conduction mechanism, we have employed small poloron hopping (SPH) model to the ρ(T) data and the results indicate that SPH is operative in the high temperature regime for all samples. The data of Seebeck coefficient (S(T)) confirms that holes are the majority charge carriers for pristine as well as doped samples. The analysis of S(T) data reveals that all the samples have a narrow band gap. The contribution from electron thermal conductivity is found to be less than 1%, thus the total conductivity is mainly because of phonon thermal conductivity. The highest value of dimensionless figure of merit (ZT = 0.127) was achieved at 374 K for the sample Cu3Sb0.99Sn0.01Se3 which is slightly higher than that of the pristine sample (ZT = 0.115). The highest value of compatibility factor (0.98 V−1) was observed for the sample Cu3Sb0.98Sn0.02Se3 at 374 K.

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Acknowledgements

The two authors (AR and SPK) acknowledge Council of Scientific and Industrial Research Grant (Sanction No.: 03(1409)/17/E MR-II) for the financial support required for this work. Authors are also thankful to Dr. P. D. Babu, UGC-DAE-CSR, Mumbai Centre for providing the necessary help in ρ(T), S(T) and κ(T) measurements.

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  1. Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, India

    K. Shyam Prasad & Ashok Rao

  2. Department of Physics, NMAM Institute of Technology, Nitte, 574110, India

    K. Shyam Prasad

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Shyam Prasad, K., Rao, A. Enhancement in the thermoelectric properties of Cu3SbSe4 by Sn doping. J Mater Sci: Mater Electron 30, 16596–16605 (2019). https://doi.org/10.1007/s10854-019-02038-w

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