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首页> 外文期刊>Advanced energy materials >Enhancement in Thermoelectric Figure of Merit in Nanostructured Bi2Te3 with Semimetal Nanoinclusions
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Enhancement in Thermoelectric Figure of Merit in Nanostructured Bi2Te3 with Semimetal Nanoinclusions

机译：具有半金属纳米夹杂物的纳米结构Bi2Te3的热电性能提高

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摘要

The effect of Bi (semimetal) nanoinclusions in nanostructured Bi2Te3 matrices is investigated. Bismuth nanoparticles synthesized by a low temperature solvothermal method are incorporated into Bi2Te3 matrix phases, synthesized by planetary ball milling. High density pellets of the Bi nanoparticle/Bi2Te3 nanocomposites are created by hot pressing the powders at 200 °C and 100 MPa. The effect of different volume fractions (0–7%) of Bi semimetal nanoparticles on the Seebeck coefficient, electrical conductivity, thermal conductivity and carrier concentration is reported. Our results show that the incorporation of semimetal nanoparticles results in a reduction in the lattice thermal conductivity in all the samples. A significant enhancement in power factor is observed for Bi nanoparticle volume fraction of 5% and 7%. We show that it is possible to reduce the lattice thermal conductivity and increase the power factor resulting in an increase in figure of merit by a factor of 2 (from ZT = 0.2 to 0.4). Seebeck coefficient and electrical conductivity as a function of carrier concentration data are consistent with the electron filtering effect, where low-energy electrons are preferentially scattered by the barrier potentials set up at the semimetal nanoparticle/semiconductor interfaces.
机译：研究了Bi（半金属）纳米夹杂物在纳米结构的Bi2Te3基体中的作用。将通过低温溶剂热法合成的铋纳米粒子掺入通过行星球磨合成的Bi2Te3基体相中。 Bi纳米颗粒/ Bi2Te3纳米复合材料的高密度颗粒是通过在200°C和100 MPa下热压粉末而制成的。报道了Bi半金属纳米粒子的不同体积分数（0–7％）对塞贝克系数，电导率，热导率和载流子浓度的影响。我们的结果表明，掺入半金属纳米颗粒会降低所有样品的晶格热导率。对于Bi纳米颗粒的体积分数为5％和7％，观察到功率因数显着提高。我们表明，可以降低晶格导热系数并增加功率因数，从而导致品质因数提高2倍（从ZT = 0.2到0.4）。塞贝克系数和电导率作为载流子浓度数据的函数与电子滤波效果一致，其中低能量电子优先通过在半金属纳米粒子/半导体界面处建立的势垒势散射。

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  • 来源
    《Advanced energy materials》 |2011年第6期|1-7|共7页
  • 作者

    S. Sumithra; Nathan J. Takas; Dinesh K. Misra; Westly M. Nolting; P.F.P. Poudeu; Kevin L. Stokes;

  • 作者单位

    Dept. of Physics and the Advanced Materials Research Institute University of New Orleans New Orleans LA-70148 USA;

    Dept. of Chemistry and the Advanced Materials Research Institute University of New Orleans New Orleans LA-70148 USA;

    Dept. of Chemistry and the Advanced Materials Research Institute University of New Orleans New Orleans LA-70148 USA;

    Dept. of Physics and the Advanced Materials Research Institute University of New Orleans New Orleans LA-70148 USA;

    Dept. of Chemistry and the Advanced Materials Research Institute University of New Orleans New Orleans LA-70148 USA;

    Dept. of Physics and the Advanced Materials Research Institute University of New Orleans New Orleans LA-70148 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    thermoelectricity; thermopower; Seebeck coefficient; electron filtering;

    机译：热电;热力;塞贝克系数;电子滤波;

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