异常载体运输增强了基于HfSe2/SnX2 (X = S, Se) 的异构结构中的热电
1Department of Physics, Faculty of Natural Sciences, M S Ramaiah University of Applied Sciences, Bengaluru, 560058, India.
Physical chemistry chemical physics : PCCP
|February 12, 2026
概括
研究人员开发了一种新的方法,使用粘合异常来减少基于HfSe2的材料中的热传输. 这种方法通过减弱原子间相互作用并改善电荷传输,为高级能量转换应用显著提高了热电性能.
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:
- 晶体结构和化学结合对于传热至关重要.
- 通过操纵粘接来降低格子导热率 (κl) 的策略尚未得到充分研究.
- 1T-HfSe2是热电应用的一个有前途的材料.
研究的目的:
- 提出一种以粘合异常驱动的方法,以减少基于HfSe2的异构结构中的格子导热率 (κl).
- 研究阴离子/离子调制对热和电子传输特性的影响.
- 通过量身定制的化学结合和晶格动态来优化热电性能.
主要方法:
- 使用了第一原则密度函数理论计算.
- 分析格子动态,声子散射路径 (AAO,AOO,ZA,LLO) 和电荷定位异常.
- 包括Frohlich相互作用来准确估计载体移动性,考虑到纵向光学 (LO) 声波散射.
主要成果:
- 在HfSe2/SnSe2和HfSe2/SnS2双层异构结构 (BLH) 中实现了极低的 κl 值 (1.10-1.87 W m−1 K−1).
- 由于结合异常和Sn原子声,观察到弱化的原子间相互作用和增强的电荷传输.
- 高电导率和卓越的热电功率 (ZT) 值高达2.91 (p型) 和2.10 (n型) 在800 K.
结论:
- 结合异常驱动的策略有效地抑制了格子的导热性,并提高了热电性能.
- 在HfSe2 BLH中量身定制的阴离子/离子调制为先进的热电材料提供了一个有前途的途径.
- 该研究提供了一种可靠的方法来估计载体流动性,通过结合LO声子散射来估计载体流动性.
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