Tailoring of the electrical and thermal properties using ultra-short period non-symmetric superlattices
Tailoring of the electrical and thermal properties using ultra-short period non-symmetric superlattices
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DOI：
10.1063/1.4954499
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发表时间：
2016-06
期刊：
影响因子：
6.1
通讯作者：
P. Komar;E. Chavez-Angel;Christoph Euler;B. Balke;U. Kolb;M. Müller;H. Kleebe;G. Fecher;G. Jakob
中科院分区：
文献类型：
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作者：
P. Komar;E. Chavez-Angel;Christoph Euler;B. Balke;U. Kolb;M. Müller;H. Kleebe;G. Fecher;G. Jakob
基于半赫斯勒化合物的热电模块提供了一种廉价而清洁的方式，可以从废热中产生环保的电能。本文研究了周期组成对非对称超晶格中电学和热性质的影响，其中组件的比例根据（TiNiSn）n:(HfNiSn)6−n和0≤n≤6个单位晶格而变化。导热系数（κ）对材料含量有很强的依赖性，在n = 3时达到最小值，而在n = 4时达到最高值。将非对称应变松弛应用于一系列热阻的模型，可以很好地模拟所测得的κ。
Thermoelectric modules based on half-Heusler compounds offer a cheap and clean way to create eco-friendly electrical energy from waste heat. Here we study the impact of the period composition on the electrical and thermal properties in non-symmetric superlattices, where the ratio of components varies according to (TiNiSn)n:(HfNiSn)6−n, and 0 ⩽ n ⩽ 6 unit cells. The thermal conductivity (κ) showed a strong dependence on the material content achieving a minimum value for n = 3, whereas the highest value of the figure of merit ZT was achieved for n = 4. The measured κ can be well modeled using non-symmetric strain relaxation applied to the model of the series of thermal resistances.