TY - JOUR
T1 - Thermoelectric properties of graphene nanoribbons with surface roughness
AU - Xiao, Huaping
AU - Cao, Wei
AU - Ouyang, Tao
AU - Xu, Xiaoyan
AU - Ding, Yingchun
AU - Zhong, Jianxin
N1 - Publisher Copyright:
© 2018 Author(s).
PY - 2018/6/4
Y1 - 2018/6/4
N2 - We theoretically investigate the ballistic thermoelectric performance of graphene nanoribbons with surface roughness using the nonequilibrium Green's function method. The results show that the surface roughness could dramatically reduce the thermal conductance of graphene nanoribbons, and thus lead to the boosting of thermoelectric performance of graphene (the figure of merit can be as high as 3.7 at room temperature). Meanwhile, the electron transport properties of different edged rough graphene nanoribbons exhibit distinctive anisotropic behaviors, i.e., the thermal power of armchair edged nanoribbons significantly increases, while that of zigzag edged remains nearly unchanged, which is mainly attributed to the edge effect. The findings presented in this paper qualify surface roughness as an efficient approach to enhance the thermoelectric performance of graphene nanoribbons.
AB - We theoretically investigate the ballistic thermoelectric performance of graphene nanoribbons with surface roughness using the nonequilibrium Green's function method. The results show that the surface roughness could dramatically reduce the thermal conductance of graphene nanoribbons, and thus lead to the boosting of thermoelectric performance of graphene (the figure of merit can be as high as 3.7 at room temperature). Meanwhile, the electron transport properties of different edged rough graphene nanoribbons exhibit distinctive anisotropic behaviors, i.e., the thermal power of armchair edged nanoribbons significantly increases, while that of zigzag edged remains nearly unchanged, which is mainly attributed to the edge effect. The findings presented in this paper qualify surface roughness as an efficient approach to enhance the thermoelectric performance of graphene nanoribbons.
UR - http://www.scopus.com/inward/record.url?scp=85048328384&partnerID=8YFLogxK
U2 - 10.1063/1.5031909
DO - 10.1063/1.5031909
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AN - SCOPUS:85048328384
SN - 0003-6951
VL - 112
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 23
M1 - 233107
ER -