通过Gete的和稀有金属伊特联合的协同优化,产生了高功率因子和出色的热性能
Zhengtang Cai1, Yu Fang1, Chun Ma1
1Solid State Physics & Material Research Laboratory, School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China.
ACS applied materials & interfaces
|November 18, 2024
概括
与 (In) 和 (Y) 配合化 (GeTe) 的联合剂可通过优化电特性和降低热导率显著提高热电性能. 这种协同方法产生了1.84的峰值值值 (ZT),比未使用过的GeTe提高了91%.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热电学是一种热电学.
背景情况:
- 在GeTe材料中过多的内在Ge空隙会导致高孔度和热导率,阻碍热电性能.
- 优化热电传输特性和微观结构对于改进基于GeTe的材料至关重要.
研究的目的:
- 为了实现协同控制和优化热电传输特性和微观结构在基于GeTe的材料.
- 调查与 (In) 和稀土元素 (Y) 的联合兴奋剂对GeTe的影响.
主要方法:
- 与In和Y一起配合GeTe,以创建Ge0.94In0.03Y0.03Te.
- 热电传输特性 (ZT,电导率,西贝克系数) 的表征.
- 对微观结构和导热率 (κ) 的分析.
主要成果:
- 在0.03Y中,GeTe样本在773K达到1.84的峰值值 (ZTmax),与GeTe矩阵相比增加了91%.
- 兴奋剂优化了带结构,增加了价值带退化.
- 兴奋剂引入了纳米级的二次阶段和格子扭曲,增强了声子散射,并将格子导热率 (κlat) 降低到0.56 W m-1 K-1 在573 K.
- 在整个温度范围内,平均功率 (ZTave) 达到~0.99,比未使用过的GeTe.提高了>140%.
结论:
- 与In和Y一起配合GeTe,通过改善电传输和显著降低导热率,协同优化热电性能.
- 与其他关于GeTe和PbTe材料的研究相比,所取得的ZT值代表了实质性的进步.
- 这种方法为开发高性能热电材料提供了一个有前途的战略.
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