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Issue 10, 2018
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Enhancing the thermoelectric performance of gamma-graphyne nanoribbons by introducing edge disorder

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Abstract

Structure disorder especially edge disorder is unavoidable during the fabrication of nanomaterials. In this paper, using the non-equilibrium Green's function method, we investigate the influence of edge disorder on the thermoelectric performance of gamma(γ)-graphyne nanoribbons (GYNRs). Our results show that the high Seebeck coefficient in pristine γ-GYNR could still be preserved although edge disorder is introduced into the structure. Meanwhile, in these edge-disordered nanoribbons the suppression of thermal conductance including electronic and phononic contributions outweighs the reduction of electronic conductance. These two positive effects combine together, and finally boost the thermoelectric conversion efficiency of γ-GYNRs. The thermoelectric figure of merit ZT in the edge-disordered γ-GYNRs (the length and width are about 55.68 and 1.41 nm) could approach 2.5 at room temperature, and can even reach as high as 4.0 at 700 K, which is comparable to the efficiency of conventional energy conversion methods. The findings in this paper indicate that the edge-disordered γ-GYNRs are a promising candidate for efficient thermoelectric energy conversion and thermal management of nanodevices.

Graphical abstract: Enhancing the thermoelectric performance of gamma-graphyne nanoribbons by introducing edge disorder

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Publication details

The article was received on 05 Dec 2017, accepted on 05 Feb 2018 and first published on 06 Feb 2018


Article type: Paper
DOI: 10.1039/C7CP08154E
Citation: Phys. Chem. Chem. Phys., 2018,20, 7173-7179
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    Enhancing the thermoelectric performance of gamma-graphyne nanoribbons by introducing edge disorder

    X. Cui, T. Ouyang, J. Li, C. He, C. Tang and J. Zhong, Phys. Chem. Chem. Phys., 2018, 20, 7173
    DOI: 10.1039/C7CP08154E

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