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基于GeTe的热电材料的高性能源于Bi2Te3合剂的产生

Di Wu¹, Li-Dong Zhao, Shiqiang Hao

¹Department of Physics, South University of Science and Technology of China , Shenzhen 518055, P. R. China.

Journal of the American Chemical Society

|July 30, 2014

概括

研究人员通过添加 bismuth telluride 在无 GeTe 合金中达到高热电功率 (ZT) ~1.9 在 773 K 时. 这种添加减少了导热率,并通过独特的带结构效应增强了热力.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
热电能转换热电能转换

背景情况:

无德 Telluride (GeTe) 是一个有前途的热电材料.
之前的研究通过兴奋剂和合金实现了靠近统一的优点 (ZT).

研究的目的:

在基于GeTe的材料中实现显著更高的ZT.
调查甲化物 (Bi2Te3) 添加在增强热电性质中的作用.

主要方法:

合成和表征Ge0.87Pb0.13Te与3mol%Bi2Te3的添加.
密度函数理论 (DFT) 计算来分析电子带结构.
传输电子显微镜 (TEM) 和晶体组理论用于微观结构分析.
使用三带 (L + Σ + C) 模型进行分析.

主要成果:

在773K时,达到了高ZT~1.9的高ZT.
Bi2Te3 增强了 PbTe 在 GeTe 中的溶解性,降低了导热性.
Bi2Te3 激活了来自 Σ 价值带的电荷传输的较高分数,增强了热力.
复杂的微观结构,包括形双体结构,有助于降低热和电导率.

结论:

石化物添加是一种有效的策略,可以显著提高GeTe的热电性能.
观察到的改善归因于热导率降低和热功率增强的组合.
该研究强调了理解带结构和微结构对于优化热电材料的重要性.

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