高性能n型PbSe-Cu2Se热电通过导电带工程和声波软化
Chongjian Zhou1, Yuan Yu2, Yong Kyu Lee1
1Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.
Journal of the American Chemical Society
|October 23, 2018
概括
没有的化 (PbSe) 与化铜 (Cu2Se) 合,达到创纪录的热电性能. 这种材料为中温发电应用提供了有希望的,具有成本效益的替代品.
科学领域:
- 材料科学
- 固态物理
- 能源转换
背景情况:
- 没有的化 (PbSe) 作为热电发电中化 (PbTe) 的经济有效替代品正在探索中.
- 开发高效的热电材料对于废热回收和可持续能源解决方案至关重要.
研究的目的:
- 研究和铜化物化物的热电特性 (PbSe0.998Br0.002-2%Cu2Se).
- 为中温应用实现高功率 (ZT) 值.
主要方法:
- PbSe0.998Br0.002-2%Cu2Se的合成和表征
- 测量电传输特性 (Seebeck系数,电导率,功率系数).
- 测量热传输特性 (热导率).
- 首先要了解其中的基本机制.
主要成果:
- 在n型和p型PbSe材料中,记录峰值ZT为1.8在723K,平均ZT为1.1 (300823K).
- 通过使导电带边缘平坦并增加有效质量,Cu2Se合剂提高了Seebeck系数.
- 显著降低晶格导热率至773 K的~0.4 W m-1 K-1,接近无形极限.
- 在广泛的温度范围内达到~2126μW cm−2 K−2的超高功率系数.
结论:
- PbSe0.998Br0.002-2%Cu2Se具有优越的热电性能,与n型PbTe材料相竞争.
- Cu2Se合有效地增强了电荷传输,并抑制了n型PbSe的导热性.
- 这项研究通过操纵PbSe的电子带结构来优化热电性能的成功策略.
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