A theoretical study on thermoelectric properties of graphene nanoribbons
A theoretical study on thermoelectric properties of graphene nanoribbons
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DOI：
10.1063/1.3171933
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发表时间：
2009-06-29
影响因子：
4
通讯作者：
Guo, Jing
中科院分区：
文献类型：
--
作者：
Ouyang, Yijian;Guo, Jing
通过求解非平衡格林函数形式下的原子电子和声子输运方程，研究了石墨烯纳米带（GNRs）的热电性质。与石墨烯相比，热电性能对温度和化学势的依赖性更强，这表明准一维几何结构在决定GNR热电性能中的重要作用。边缘粗糙度和晶格空位增加了热功率，但降低了热电ZT因子，因为电子电导的减少超过了热导的减少和热功率的增加。
We investigate the thermoelectric properties of graphene nanoribbons (GNRs) by solving atomistic electron and phonon transport equations in the nonequilibrium Green's function formalism. The dependence of thermopower on temperature and chemical potential is compared to that of graphene, which shows the important role of quasi-one-dimensional geometry in determining the thermoelectric properties of a GNR. The edge roughness and lattice vacancy are found to increase the thermopower but decrease the thermoelectric ZT factor because the decrease in the electronic conductance outweighs the decrease in the thermal conductance and the increase in the thermopower.