Vacancy phonon scattering in thermoelectric In2Te3-InSb solid solutions
Vacancy phonon scattering in thermoelectric In2Te3-InSb solid solutions
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DOI：
10.1063/1.3109788
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发表时间：
2009-03
影响因子：
4
通讯作者：
Y. Pei;D. Morelli
中科院分区：
文献类型：
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作者：
Y. Pei;D. Morelli
固溶体形成是降低热电材料晶格热导率的一种常见而有效的方法，因为由于质量和应变波动引起的点缺陷会产生额外的声子散射。这种散射对于空位是最大的。本文给出了InSb-In_2 Te_3系统声子-空位散射的强效应的一个例子。测得的传输特性显示出减少了一个数量级以上的晶格热导率。还通过掺杂对热电应用的优化进行了进一步的努力。研究结果表明，该固溶体是一种很有前途的新型热电材料。
Solid solution formation is a common and effective approach to reduce the lattice thermal conductivity for thermoelectric materials because of additional phonon scattering by point defects due to mass and strain fluctuations. This scattering is maximal for vacancies. In this paper we present an example of the strong effect of phonon-vacancy scattering for the InSb–In2Te3 system. The measured transport properties show a reduction by more than an order of magnitude of the lattice thermal conductivity. Further efforts are also made on optimization for thermoelectric applications through doping. Our results indicate that these solid solutions are a prospective new-type thermoelectric material.