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Improving the thermoelectric properties of graphene through zigzag graphene–graphyne nanoribbon heterostructures
The European Physical Journal B ( IF 1.6 ) Pub Date : 2021-02-10 , DOI: 10.1140/epjb/s10051-021-00062-6
Jianhua Zhou , Donghua Li

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.

Graphic abstract



中文翻译:

通过曲折的石墨烯-石墨烯纳米带异质结构改善石墨烯的热电性能

摘要

热电材料可以将热能和电能相互转化,这近年来引起了广泛的关注。在本文中,我们系统地研究了四个锯齿形石墨烯-石墨烯纳米带异质结构M \(i(i = 1 {-} 4)\)的弹道热电性能。通过利用非平衡格林函数方法。我们的结果表明,相对于原始石墨烯纳米带,异质结构具有优异的热电性能。特别是,M4的ZT值在700 K时达到1.5,约为石墨烯的15倍。这种改善主要源于声子和电子热导率的降低以及塞贝克系数的增加。同时,由于M4具有最低的声子热导率和良好的热功率,因此其热电性能最佳。本文中的这些发现证明,异质结构是优化石墨烯热电性能的可行方法,这为纳米级热电器件的设计和制造提供了有用的指导。

图形摘要

更新日期:2021-02-10
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