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格子平面化导致P型PbSe晶体的高热电性能

Shibo Liu¹, Yi Wen¹, Shulin Bai¹

¹School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.

Advanced materials (Deerfield Beach, Fla.)

|March 11, 2024

概括

与铜合的化 (PbSe) 晶体显示了增强的热电性能. 这项研究表明PbSe是比斯木化 (Bi2Te3) 的有希望的替代品,用于发电和制冷.

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:

热电材料对于废热回收和固态冷却至关重要.
石化物 (Bi2Te3) 是商业标准,但依赖于稀缺的.
化 (PbSe) 提供了一个潜在的替代品,由于 Tellurium 丰富度更高.

研究的目的:

为了提高p型PbSe.p的近室温热电性能.
通过格子平面化,提高p型PbSe中的载体流动性.
探索铜 (Cu) 兴奋剂作为提高表现的策略.

主要方法:

物理蒸汽沉积被用来生长组合控制的,Cu-doped p型PbSe晶体.
进行了微观结构的表征,以分析材料的结构.
用密度函数理论 (DFT) 的计算来理解兴奋剂机制.

主要成果:

在PbSe中,Cu兴奋剂显著增强了载体流动性,达到Pb0.996Cu0.0004Se的≈2578 cm2 V-1 s-1.
观察到Cu原子填补了空缺,导致格子平面化和改善了移动性.
优化的Pb0.996Cu0.0004Se实现了≈42μW cm−1 K−2的功率因子,并在300 K时达到≈0.7的ZT.
在300573K的温度范围内,平均ZT达到≈0.9,产生7.1%的发电效率.
一个使用p型Pb0.996Cu0.0004Se的装置实现了≈42K的最大冷却温度差.

结论:

通过Cu兴奋剂进行晶格平化,有效地提高了p型PbSe在室温附近的热电性能.
Cu-doped PbSe 显示出与商业 Bi2Te3.3 相比的发电效率.
该材料对固态冷却应用具有显著的潜力,达到Bi2Te3设备性能的65%.
这项工作强调了p型PbSe作为热电发电和制冷中的Bi2Te3的可行替代品.

关键词:

运营商移动性的运营商移动性格子平面化的格子平面化.在p型PbSe中,p型PbSe是热电器件是一种热电器件.

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