Thermoelectric properties of graphene nanoribbons with surface roughness

Huaping Xiao, Wei Cao, Tao Ouyang, Xiaoyan Xu, Yingchun Ding, Jianxin Zhong

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number233107
JournalApplied Physics Letters
Issue number23
StatePublished - 4 Jun 2018
Externally publishedYes


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