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Improving the thermoelectric properties of graphene through zigzag graphene–graphyne nanoribbon heterostructures

  • Regular Article - Solid State and Materials
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Abstract

Thermoelectric materials can convert thermal energy and electrical energy into each other, which have attracted extensive attention in recent years. In this paper, we systematically investigate the ballistic thermoelectric performance of four zigzag graphene–graphyne nanoribbon heterostructures M\(i(i=1{-}4)\) through utilizing non-equilibrium Green’s function method. Our results show that heterostructures possess superior thermoelectric properties with respect to pristine graphene nanoribbon. Especially, the ZT value of M4 reaches 1.5 at 700 K, which is about 15 times that of graphene. Such improvement mainly originates from the reduction of phononic and electronic thermal conductance and the increase of Seebeck coefficient. Meanwhile, because M4 has the lowest phonon thermal conductance and favorable thermal power, its thermoelectric figure of merit is the best. These findings in this paper demonstrate that heterostructure is a viable approach to optimize the thermoelectric performance of graphene, which provides useful guidance for the design and fabrication of nanoscale thermoelectric devices.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The data used to support the findings of this study are available from the corresponding author upon request.]

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Acknowledgements

This work is supported by the Scientific Research Fund of Hunan Provincial Education Department (Grant no. 20A449) and Scientific research projects of Shaoyang science and Technology Bureau (Grant no. 2020GZ90).

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Authors and Affiliations

  1. School of Information Engineering, Shaoyang University, Shaoyang, 422000, China

    Jianhua Zhou

  2. Office of Journal of Shaoyang University, Shaoyang, 422000, China

    Donghua Li

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  1. Jianhua Zhou
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  2. Donghua Li
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Correspondence to Jianhua Zhou.

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Zhou, J., Li, D. Improving the thermoelectric properties of graphene through zigzag graphene–graphyne nanoribbon heterostructures. Eur. Phys. J. B 94, 52 (2021). https://doi.org/10.1140/epjb/s10051-021-00062-6

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  • DOI: https://doi.org/10.1140/epjb/s10051-021-00062-6

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