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Proceedings Paper

Graphene nano-ribbon with nano-breaks as efficient thermoelectric device
Author(s): Md Sharafat Hossain; Feras Al-Dirini; Liming Jiang; Faruque M. Hossain; Efstratios Skafidas
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Paper Abstract

It has been well established that delta-like transport distribution of electron gives the best thermoelectric performance. On another front, it has been experimentally verified that graphene nano-ribbon with nano-break in the channel region exhibits tunnelling. Here, we utilize the tunnelling phenomena observed in graphene break junctions to achieve delta like transport distribution. Indeed our device exhibit record ZT ranging from 10 to 100. This high ZT can be attributed to complete blockage of phonon transport due to the break. The electrical conductance also goes very low, however, near the tunnelling energy it becomes significant, giving rise to an enhanced ZT value. In this report we investigate the effect edge orientation and the width of the ribbon on thermoelectric property. Moreover, we investigate the effect of temperature on tunnelling and how it affect thermoelectric performance. We find that there is an optimal temperature at which the device performs best. In the simulations, we assumed ballistic transport and used first principle approach to obtain the electrical properties. The phononic system was characterized by a Tersoff empirical potential model. The proposed device structure has potential applications as a two-dimensional nanoscale local cooler and as a thermoelectric power generator when connected in arrays.

Paper Details

Date Published: 22 December 2015
PDF: 6 pages
Proc. SPIE 9668, Micro+Nano Materials, Devices, and Systems, 96683U (22 December 2015); doi: 10.1117/12.2203197
Show Author Affiliations
Md Sharafat Hossain, The Univ. of Melbourne (Australia)
National ICT Australia (Australia)
Feras Al-Dirini, The Univ. of Melbourne (Australia)
National ICT Australia (Australia)
Liming Jiang, The Univ. of Melbourne (Australia)
National ICT Australia (Australia)
Faruque M. Hossain, The Univ. of Melbourne (Australia)
Efstratios Skafidas, The Univ. of Melbourne (Australia)

Published in SPIE Proceedings Vol. 9668:
Micro+Nano Materials, Devices, and Systems
Benjamin J. Eggleton; Stefano Palomba, Editor(s)

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