在高性能热电晶体AgSbSe2中,直接实验证实了低载波散射潜力
Kaiqi Zhang1, Yuling Huang2, Shuang Liu1
1Center of Quantum Materials & Devices and College of Physics, Chongqing University, Chongqing, 401331, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|April 22, 2025
概括
Cd-doping AgSbSe2通过优化微观结构来降低载体散射潜力,显著提高热电性能. 这种增强导致功率因子增加了三倍,功率值为1.7.
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:
- 热电材料需要高载体流动性,受散射潜力的影响.
- 微观结构等外部因素对AgSbSe2.2等材料的载体运输有重大影响.
- 量化总载体散射潜力和区分内在和外在贡献仍然在实验上具有挑战.
研究的目的:
- 用超快光谱学量化描述AgSbSe2中的电荷载体动态.
- 研究 (Cd) 兴奋剂对AgSbSe2.2中载体散射潜力的影响.
- 建立调节热电化合物中载体散射潜力的方法.
主要方法:
- 时间分辨率的超快速光谱学,采用5秒分辨率的探头方案.
- 对电荷载体动态的定量分析.
- 对载体散射潜力及其组成部分的实验性评估.
主要成果:
- 使用Cd-dopingAgSbSe2显著降低了总载体散射潜力.
- 消除谷物界限和引入短距离订单有助于产生负的外部散射潜力.
- 减少的散射潜力导致平均功率因子 (323723 K) 增加了三倍.
- 在723K时,在AgSb0.973Cd0.017Se2.2中达到1.7的最大热电功率 (ZT).
- 单脚热电装置的竞争性输出效率达到了8%.
结论:
- 通过改进微观结构,Cd剂有效调节AgSbSe2中的载体散射潜力.
- 优化载体散射是提高热电性能的一种可行的策略.
- 这项研究提供了对先进热电材料载体散射的特征和控制的见解.
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