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Enhanced thermoelectric performance of CoSbS0.85Se0.15 by point defect

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Abstract

In this study, we report the effect of Zn doping on the thermoelectric properties of Co1−x Zn x SbS0.85Se0.15 solid solutions (x = 0, 0.02, 0.05, 0.08). The results show the dimensionless figure of merit (zT) increases from 0.17 to 0.34 at 875 K for Co0.95Zn0.05SbS0.85Se0.15 sample, due to the noticeable decrease in the lattice thermal conductivity by introducing point defect, which is further confirmed by an analysis based on the Debye–Callaway–Klemens model. Meanwhile, the thermoelectric power factor is maintained at high temperatures. This work highlights the important role of point defect in improving the thermoelectric performance of CoSbS-based compounds.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 11344010, 11404044 and 51472036) and the Fundamental Research Funds for the Central Universities (No. 106112016CDJZR308808).

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Authors and Affiliations

  1. Department of Applied Physics, Chongqing University, Chongqing, 400044, China

    Shan-Shan Zhang, Nusrat Shaheen, Xing-Chen Shen, Dan-Dan Xie, Yan-Ci Yan, Xu Lu & Xiao-Yuan Zhou

  2. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, 100124, China

    Ding-Feng Yang

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  1. Shan-Shan Zhang
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Correspondence to Xu Lu.

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Zhang, SS., Yang, DF., Shaheen, N. et al. Enhanced thermoelectric performance of CoSbS0.85Se0.15 by point defect. Rare Met. 37, 326–332 (2018). https://doi.org/10.1007/s12598-017-0990-x

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  • DOI: https://doi.org/10.1007/s12598-017-0990-x

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