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Nonlinear thermoelectric efficiency of superlattice-structured nanowires

机译：超晶格结构纳米线的非线性热电效率

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摘要

We theoretically investigate nonlinear ballistic thermoelectric transport in a superlattice-structured nanowire. By a special choice of nonuniform widths of the superlattice barriers-analogous to antireflection coating in optical systems-it is possible to achieve a transmission which comes close to a square profile as a function of energy. We calculate the low-temperature output power and power-conversion efficiency of a thermoelectric generator based on such a structure and show that the efficiency remains high also when operating at a significant power. To provide guidelines for experiments, we study how the results depend on the nanowire radius, the number of barriers, and on random imperfections in barrier width and separation. Our results indicate that high efficiencies can indeed be achieved with today's capabilities in epitaxial nanowire growth.
机译：我们从理论上研究了超晶格结构纳米线中的非线性弹道热电传输。通过特殊选择超晶格屏障的非均匀宽度（类似于光学系统中的防反射涂层），可以实现根据能量接近方形轮廓的透射率。基于这种结构，我们计算出热电发电机的低温输出功率和功率转换效率，并表明当以较大功率运行时，效率仍然很高。为了为实验提供指导，我们研究了结果如何取决于纳米线半径，势垒数以及势垒宽度和间隔的随机缺陷。我们的结果表明，利用当今外延纳米线生长的功能，确实可以实现高效率。

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  • 来源
    《Physical review》 |2016年第11期|115414.1-115414.7|共7页
  • 作者

    Hossein Karbaschi; John Loven; Klara Courteaut; Andreas Wacker; Martin Leijnse;

  • 作者单位

    Division of Solid State Physics and NanoLund, Lund University, Box 118, S-221 00 Lund, Sweden,Department of Physics, Faculty of Sciences, University of Isfahan, Isfahan 81746-73441, Iran;

    Division of Solid State Physics and NanoLund, Lund University, Box 118, S-221 00 Lund, Sweden;

    Division of Mathematical Physics and NanoLund, Lund University, Box 118, S-221 00 Lund, Sweden;

    Division of Mathematical Physics and NanoLund, Lund University, Box 118, S-221 00 Lund, Sweden;

    Division of Solid State Physics and NanoLund, Lund University, Box 118, S-221 00 Lund, Sweden;

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