Bilayer graphene nanoribbons junction with aligned holes exhibiting high ZT values

被引：9

作者：

Deng, Shuo ^{[1
,2
]}

Li, Lijie ^{[2
]}

Rees, Paul ^{[2
]}

机构：

[1] Wuhan Univ Technol, Wuhan 430070, Hubei, Peoples R China

[2] Swansea Univ, Coll Engn, Swansea SA1 8EN, W Glam, Wales

来源：

CARBON | 2019年 / 155卷

关键词：

Graphene nanoribbon junction with aligned holes; Thermoelectric; First principles method; ENHANCED THERMOELECTRIC PERFORMANCE;

D O I：

10.1016/j.carbon.2019.09.012

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigate the thermoelectric performance of armchair graphene nanoribbon (AGNR), bilayer GNRs junction (BGNRJ) and BGNRJ with holes (BGNRJ-H) by the first principles calculation with non-equilibrium Green function. It is found that the BGNRJ-H exhibits high ZT values of 9.65 and 5.55 at 300K. The reason of these significantly larger ZT values than previously observed has been calculated due to reduced thermal conductivity and enhanced electrical conductivity. The low thermal conductance comes from the van der Waals (vdW) interaction between two graphene layers. The increased electrical conductivity can be attributed to the coupling effect of aligned holes in both layers. It is found from analysis results that the electron transmission of the BGNRJ-H is much stronger than a normal BGNRJ, which gives rise to the higher electrical conductance and outstanding ZT values. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：438 / 444

页数：7

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