Enhanced thermoelectric properties of armchair graphene nanoribbons with defects and magnetic field | Zendy

Wei Zhao | Zendy; Zhenyin Guo | Zendy; Juexian Cao | Zendy; Jianwen Ding | Zendy

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Enhanced thermoelectric properties of armchair graphene nanoribbons with defects and magnetic field

Author(s) -

Wei Zhao,

Zhenyin Guo,

Juexian Cao,

Jianwen Ding

Publication year - 2011

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.3660787

Subject(s) - condensed matter physics , materials science , thermoelectric effect , graphene nanoribbons , graphene , thermal conductivity , conductance , thermal conduction , magnetic field , band gap , transversal (combinatorics) , figure of merit , conduction band , nanotechnology , electron , physics , optoelectronics , composite material , thermodynamics , quantum mechanics , mathematical analysis , mathematics

We have investigated the thermoelectric properties of armchair graphene nanoribbons with defects and magnetic field by using non-equilibrium Green's function method. For perfect armchair graphene nanoribbons, it is shown that with its width increasing, the maximum of the figure of merit ZT is monotonously decreased while the phononic thermal conductance increases linearly. In the presence of defects, the phononic thermal conductance decreases monotonously with the defect number increasing. Interestingly, the maximum of ZT values is proportional to the defect number in longitudinal direction, but inversely proportional to that in transversal direction. In the presence of magnetic field, very remarkable enhancement of ZT value is further obtained at the bottom of conduction band

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