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arXiv 1901.04718cond-mat.mtrl-sci
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双极热电材料功率因数的掺杂优化

Doping optimization for the power factor of bipolar thermoelectric materials

Samuel Foster, Neophytos Neophytou

摘要:

双极载流子输运通常是窄带隙材料在高温下的热电效率的限制因素,这是由于塞贝克系数的降低和热导率的附加项的引入。使用玻尔兹曼传输形式主义和一个两带模型,我们模拟通过双极系统的运输和计算其热电输运性质:电导率,塞贝克系数和热电功率因数。我们提出了一个调查到这种材料的掺杂优化,显示不利的影响,温度上升,如果掺杂(和费米能级)没有优化每个工作温度。我们还表明,在给定的工作温度下优化的功率因数的掺杂水平不同,在双极系统相比,单极的。最后,我们表明,在600 K,在双极材料的带隙近似的Bi 2 Te 3,所需的最佳掺杂可以驻留在10% - 30%之间大于所需的最佳单极材料取决于材料的电子散射的细节。

英文摘要:

Bipolar carrier transport is often a limiting factor in the thermoelectric efficiency of narrow bandgap materials at high temperatures due to the reduction in the Seebeck coefficient and the introduction of an additional term to the thermal conductivity. Using the Boltzmann transport formalism and a two-band model, we simulate transport through bipolar systems and calculate their thermoelectric transport properties: the electrical conductivity, the Seebeck coefficient and the thermoelectric power factor. We present an investigation into the doping optimisation of such materials, showing the detrimental impact that rising temperatures have if the doping (and the Fermi level) is not optimised for each operating temperature. We also show that the doping levels for optimized power factors at a given operating temperature differ in bipolar systems compared to unipolar ones. We show finally that at 600 K, in a bipolar material with bandgap approximately that of Bi2Te3, the optimal doping required can reside between 10% - 30% larger than that required for an optimal unipolar material depending on the electronic scattering details of the material.

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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