石墨烯
热电效应
材料科学
塞贝克系数
凝聚态物理
纳米技术
物理
量子力学
作者
P. X. Zhang,Chao Wang,L. F. Zhai,Juntao Song
摘要
The Seebeck effect in graphene with uniform Kekulé lattice distortion has been studied using the tight-binding model combined with the nonequilibrium Green's function method. The numerical results of this work show that the Seebeck coefficient of the O-shaped Kekulé graphene can be enhanced by modulating the gate voltage. At room temperature (T≈300 K), the Seebeck coefficient for the armchair nanoribbon is Sc≈1370μV/K and for the zigzag nanoribbon is Sc≈1260μV/K. At low temperature (T≈128 K), the Seebeck coefficient for the armchair nanoribbon is Sc≈2500μV/K. In addition, the nano-structuration of the O-shaped Kekulé graphene layer induces an anisotropic behavior in the Seebeck effect. Our work provides an idea for the fabrication of efficient and controllable thermoelectric effect devices.
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