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Title: Electronic, phononic, and thermoelectric properties of graphyne sheets

Electron, phonon, and thermoelectric transport properties of α-, β-, γ-, and 6,6,12-graphyne sheets are compared and contrasted with those of graphene. α-, β-, and 6,6,12-graphynes, with direction dependent Dirac dispersions, have higher electronic transmittance than graphene. γ-graphyne also attains better electrical conduction than graphene except at its band gap. Vibrationally, graphene conducts heat much more efficiently than graphynes, a behavior beyond an atomic density differences explanation. Seebeck coefficients of the considered Dirac materials are similar but thermoelectric power factors decrease with increasing effective speeds of light. γ-graphyne yields the highest thermoelectric efficiency with a thermoelectric figure of merit as high as ZT = 0.45, almost an order of magnitude higher than that of graphene.
Authors:
 [1] ;  [2]
  1. Department of Materials Science and Engineering, Izmir Institute of Technology, Izmir, TR 35430 (Turkey)
  2. Department of Mechanical Engineering, Faculty of Engineering, Anadolu University, Eskisehir, TR 26555 (Turkey)
Publication Date:
OSTI Identifier:
22402426
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; CHARGE TRANSPORT; DISPERSION RELATIONS; EFFICIENCY; GRAPHENE; PERFORMANCE; PHONONS; SEEBECK EFFECT; SHEETS; THERMOELECTRIC PROPERTIES