arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.05903cond-mat.mes-hallphysics.atom-ph
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MoS2纳米带热电发电机

MoS2 Nanoribbons Thermoelectric Generators

Abbas Arab, Qiliang Li

摘要:

在这项工作中,我们设计和模拟了新的热电发电机的基础上单层和少层二硫化钼纳米带。所提出的热电发电机是由热电偶制成的n型和p型二硫化钼纳米管腿。采用密度泛函紧束缚非平衡格林函数(DFTB-NEGF)方法计算了二硫化钼扶手椅型和锯齿型纳米带的透射光谱。在Stillinger-Weber势参数化的基础上计算了声子透射谱。热电优值,ZT,计算使用这些电子和声子的透射谱。单层和双层MoS 2扶手椅型纳米带的p型和n型腿分别具有最高的ZT值。此外,我们还比较了单层掺杂的二硫化钼扶手椅型纳米带和硅化薄膜的热电电流。结果表明,MoS 2单层纳米带的热电势电流比Si薄膜的热电势电流高几个数量级。

英文摘要:

In this work, we have designed and simulated new thermoelectric generator based on monolayer and few-layer MoS2 nanoribbons. The proposed thermoelectric generator is composed of thermocouples made of both n-type and p-type MoS2 nanoribbon legs. Density Functional Tight-Binding Non-Equilibrium Green's Function (DFTB-NEGF) method has been used to calculate the transmission spectrum of MoS2 armchair and zigzag nanoribbons. Phonon transmission spectrum are calculated based on parameterization of Stillinger-Weber potential. Thermoelectric figure of merit, ZT, is calculated using these electronic and phonon transmission spectrum. Monolayer and bilayer MoS2 armchair nanoribbons are found to have the highest ZT value for p-type and n-type legs, repectively. Moreover, we have compared the thermoelectric current of doped monolayer MoS2 armchair nanoribbons and SZi thin films. Results indicate that thermoelectric current of MoS2 monolayer nanoribbons is several orders of magnitude higher than that of Si thin films.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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