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Tuning bands of PbSe for better thermoelectric efficiency

机译:PbSe的调谐带可提高热电效率

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摘要

Improving the thermoelectric performance of PbSe over its previously reported maximum zT can be achieved by engineering its electronic band structure. We demonstrate here, using optical absorption spectra, first principles calculations, and temperature dependent transport measurements, that alloying PbSe with SrSe leads to a dramatic change of the band structure that increases the thermoelectric figure of merit, zT. The temperature where the two valence bands converge decreases with Sr addition. The zT value, when the carrier density is optimized, increases with Sr addition in Pb_(1-x)Sr_xSe and when × = 0.08 a maximum zT of 1.5 at 900 K is achieved. The net benefit in zT comes from the band structure tuning even though in other thermoelectric solid solutions it is the thermal conductivity reduction from disorder that leads to net zT improvement.
机译:通过设计其电子能带结构,可以提高PbSe的热电性能使其超过先前报告的最大zT。我们在这里使用光吸收光谱,第一性原理计算和与温度相关的传输测量证明,将PbSe与SrSe合金化会导致能带结构发生剧烈变化,从而增加热电性能因数zT。随着Sr的添加,两个价带收敛的温度降低。当载流子密度优化时,zT值会随着Pb_(1-x)Sr_xSe中Sr的增加而增加,并且当x = 0.08时,在900 K时可达到1.5的最大zT。 zT的净收益来自能带结构调整,即使在其他热电固体解决方案中,由于无序的导热系数降低也导致净zT改善。

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  • 来源
    《Energy & environmental science》 |2014年第2期|804-811|共8页
  • 作者单位

    Materials Science, California Institute of Technology, Pasadena, CA 91125, USA;

    Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA;

    Department of Advanced Materials Science, The University of Tokyo, Kiban-toh 502, 5- 1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8561, Japan;

    Materials Science, California Institute of Technology, Pasadena, CA 91125, USA;

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