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Investigating Enhanced Thermoelectric Performance of Graphene Based Nano-structures

Abstract

Recently it has been demonstrated that Graphene-nano-ribbons (GNRs) exhibit superior thermoelectric performance compared to graphene sheet. However, the underlying mechanism behind this enhancement has not been systematically investigated and significant opportunity remains for further enhancement of the thermoelectric performance of GNRs by optimizing their charge carrier concentration. In this work, we modulate the carrier concentration of graphene based nano-structures using a gate voltage and investigate the resulting carrier-concentration-dependent thermoelectric parameters using the Boltzmann transport equations. We investigate the effect of energy dependant scattering time and the role of substrate-induced charge carrier fluctuation in optimizing the Seebeck coefficient and power factor. Our approach predicts the scattering mechanism and the extent of the charge carrier fluctuation in different samples and explains the enhancement of thermoelectric performance of GNR samples. Subsequently we propose a route towards the enhancement of thermoelectric performance of graphene based devices which can also be applied to other two-dimensional materials.

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Supplementary files

Publication details

The article was accepted on 14 Jan 2018 and first published on 18 Jan 2018


Article type: Paper
DOI: 10.1039/C8NR00134K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Investigating Enhanced Thermoelectric Performance of Graphene Based Nano-structures

    M. S. Hossain, D. H. Huynh, L. Jiang, S. Rahman, P. D. Nguyen, F. M. A. Al-Dirini, F. M. Hossain, J. Bahk and S. Skafidas, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR00134K

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