• 文献标题:   Bilayer graphene nanoribbons junction with aligned holes exhibiting high ZT values
  • 文献类型:   Article
  • 作  者:   DENG S, LI LJ, REES P
  • 作者关键词:   graphene nanoribbon junction with aligned hole, thermoelectric, first principles method
  • 出版物名称:   CARBON
  • ISSN:   0008-6223 EI 1873-3891
  • 通讯作者地址:   Swansea Univ
  • 被引频次:   0
  • DOI:   10.1016/j.carbon.2019.09.012
  • 出版年:   2019

▎ 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.