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通过Cu兴奋剂增强p型AgSbTe的热电性能

Wenjie Shu¹, Yuxia Tang¹, Bingwen Su¹

¹National Laboratory of Solid-State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and School of Physics, Nanjing University, Nanjing 210093, China.

ACS applied materials & interfaces

|September 27, 2024

概括

铜兴奋剂增强了银抗氧 Telluride (AgSbTe2) 的热电特性. 这种兴奋剂策略抑制了杂质,优化了载体度,并提高了整体性能,达到约1.45的峰值ZT.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
能源转换能源转换

背景情况:

银反化 (AgSbTe2) 是一种p型半导体,有可能用于中温热电应用 (300-700 K).
它的热电性能目前受到运载体度不足和Ag2Te杂质存在的限制.

研究的目的:

研究铜 (Cu) 兴奋剂对AgSbTe2.2的热电性质的影响.
探索Cu兴奋剂作为减轻Ag2Te杂质和增强载体度的策略.

主要方法:

合成具有不同Cu度的AgSb1-xCuxTe2化合物 (x = 0, 0.02, 0.04, 0.06).
热电性质的全面表征,包括功率因子和导热率.
计算分析以了解性能改进的潜在机制.

主要成果:

doping有效地抑制了AgSbTe2矩阵中的Ag2Te杂质.
兴奋剂导致载体度增加和功率因子提高.
计算表明,Cu注降低了费米水平,缩小了带间隙,并减少了价值带最大差异,提高了功率因子.
doping 降低了导热率,这归因于杂质抑制和声软化.
该AgSb0.96Cu0.04Te2样本的峰值值值 (ZT) 在498K时约为1.45.

结论:

铜合是一种可行的策略,可以提高AgSbTe2.2的热电性能.
优化的AgSb0.96Cu0.04Te2材料显示了中温热电能转换的巨大潜力.
这项研究提供了对兴奋剂提高热电效率的机制的见解.

关键词:

在Ag2TeTe的基础上.在AgSbTe2的基础上.随着兴奋剂的使用发声器软化发声器软化热电热电的电力.

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