关于Sn,In和Se共对GeTe的热电特性影响的研究
Tao Guo1, Guangbing Zhang1, Bohang Nan1
1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Materials (Basel, Switzerland)
|April 9, 2024
概括
这项研究通过多元元素兴奋剂增强了 Telluride (GeTe) 的热电特性. 达到了0.9的热电功率 (zT) 峰值,显示了高效能源转换的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术纳米技术
背景情况:
- telluride (GeTe) 是一个有前途的热电材料.
- 优化GeTe的热电性能需要战略性兴奋剂.
- 了解兴奋剂对电荷传输和导热性的影响至关重要.
研究的目的:
- 为了研究Sn,In和Se多元素兴奋剂对GeTe热电性能的协同效应.
- 提高GeTe的热电功率 (zT) 和功率系数 (PF) 的值.
- 阐明物业改进背后的机制.
主要方法:
- 用不同度的Sn,In和Se合的GeTe样本使用真空合成和火花等离子烧结 (SPS) 来合成.
- 用X射线衍射 (XRD) 来进行结构分析.
- 测量了热电特性 (西贝克系数,电导率,热导率).
- 使用导电比率方法分析了散射机制.
主要成果:
- 在Ge0.99In0.01Te0.94Se0.06.2中,在723K时,达到0.9的最大zT和3.87μWmm−1K−2的PF.
- 化剂促进了Ge的溶解,而化剂增加了Seebeck系数,而Se化剂降低了晶格导热率.
- 子散射占主导地位,由于Sn兴奋剂而增强合金散射.
- 在580K附近的相位过渡对热电特性产生了负面影响.
结论:
- 多元元素兴奋剂,特别是In和Se,显著改善了GeTe的热电特性.
- 观察到的改善是由于兴奋剂之间的协同相互作用而产生的,而不仅仅是附加效应.
- 需要进一步优化,以减轻相位过渡对更广泛应用的负面影响.
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