高的p型热电性能由单层CdSbS3中几乎平的带驱动
Won Seok Yun1, June-Seo Kim1, Myoung-Jae Lee1
1Division of Nanotechnology, DGIST, Daegu 42988, Republic of Korea. spin2mtj@dgist.ac.kr.
Dalton transactions (Cambridge, England : 2003)
|November 12, 2025
概括
单层抗硫化物 (CdSbS3) 显示出作为热电材料的前景. 其独特的电子结构和低导热率导致其在能源转换应用中具有很高的功率 (ZT).
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 固态化学 固态化学
背景情况:
- 热电材料有效地将热能转化为电能.
- 二维 (2D) 材料为先进的热电设备提供独特的特性.
- 探索像CdSbS3这样的新二维材料对于提高热电性能至关重要.
研究的目的:
- 为了研究单层反硫化物 (1L-CdSbS3) 的热电特性.
- 为了评估1L-CdSbS3.3的稳定性和电子特性.
- 为了确定1L-CdSbS3在热电应用中的潜力.
主要方法:
- 第一个原则计算 (密度函数理论).
- 半古典的博尔兹曼运输理论.
- 第一原则分子动力学和声子分散计算.
主要成果:
- 确认了1L-CdSbS3.3的热和动态稳定性.
- 确定了1L-CdSbS3作为一个带有间接带间隙的半导体 (1.238 eV GGA-PBE,2.408 eV HSE06).
- 由于几乎平坦的带,观察到低的晶格导热率 (~4 W m^-1 K^-1) 和高的p型Seebeck系数.
- 在最佳的p型兴奋剂下,在450K时达到高功率 (ZT) 达1.71,达到高功率 (ZT).
结论:
- 1L-CdSbS3表现出极好的热电特性,这是由于其有利的电子结构和低导热率.
- 该材料显示了高效的热电能转换的巨大潜力.
- 这项研究提供了有价值的见解,并鼓励对热电应用中的1L-CdSbS3进行进一步的研究.
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