空位抑制诱导了Sb-杂的GeTe中热电性能的协同优化,由正电子毁灭光谱学证明
Tingdong Zhang1, Ning Qi1, Xianli Su2
1Hubei Nuclear Solid Physics Key Laboratory, Department of Physics, Wuhan University, Wuhan 430072, China.
ACS applied materials & interfaces
|August 16, 2023
概括
在 Telluride (GeTe) 中的抗兴奋剂增强了其热电特性. 这种优化导致在723K时的高热电功率 (ZT) 值为2.2,改善了基于GeTe的材料.
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.
- 优化其电气和热传输特性对于高效的能量转换至关重要.
研究的目的:
- 通过反 (Sb) 兴奋剂在GeTe中实现电热传输的协同优化.
- 调查Sb兴奋剂对Ge空缺,载体度和流动性的影响.
- 为了提高GeTe.Te的热电功率 (ZT) 的数字.
主要方法:
- 对德 Telluride (GeTe) 的反 (Sb) 兴奋剂.
- 测量正子灭绝测量以分析Ge空位.
- 电导率,载体度和移动性的表征.
- 测量热导率 (电子和格子组件).
主要成果:
- Sb兴奋剂有效地抑制了Ge空缺,与孔载体度的变化相关.
- 航空公司的流动性增加,因为空缺和航空公司的分散减少了.
- 在Ge0.94Sb0.06Te的723K时,获得了4562μWm−2K−2的最大功率系数.
- 随着Sb兴奋剂的增加,电子导热率下降.
- 格子的导热性被声子散射机制和微观结构特征所抑制.
结论:
- 在GeTe中通过Sb兴奋剂实现了电气和热传输的协同优化.
- 在723K时获得了高热电功率 (ZT) 值2.2的高热电值.
- 用Sb合的GeTe在实际应用中表现出优越的热电特性.
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