螺旋扭曲接口调制增强了晶体的热电特性
Stanley Abbey1, Hanhwi Jang2, Brakowaa Frimpong1
1Department of Materials Science and Engineering, Hanbat National University, Yuseong-gu, Daejeon, 34158, Republic of South Korea.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|July 23, 2024
概括
(Te) 等奇拉热电材料的接口工程增强了能量转换. Sb-doping和Sb2Te3沉物提高电导率并降低热导率以提高热电性能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术纳米技术
背景情况:
- 热电材料为废热能转化提供了一条途径.
- 在热电材料中操纵颗粒边界和性结构是提高性能的关键.
- 大量晶体中状运输机制在很大程度上被忽视了.
研究的目的:
- 调查接口工程对Sb化 (Te) 晶体热电性质的影响.
- 探索嵌入式Sb2Te3沉物在调制载体和声子运输中的作用.
- 为了了解性原子重定向如何影响热电性能.
主要方法:
- 增长的Sb-doped Te晶体与嵌入的Sb2Te3沉物.
- 谷物边界效应和接口结构的分析.
- 测量电导率,热导率和功率因子.
- 评估无维度的功绩数字 (zT).
主要成果:
- 实现了低粒度边界散射和结构重组的粒度边界.
- 由于高电导率,与多晶样品相比,观察到功率因子增加了两倍.
- 由于Sb2Te3沉而导致格子导热率显著下降.
- 在623K时获得了1.1的高无维值 (zT) 值.
结论:
- 接口工程,特别是在奇拉Te和achiralSb2Te3之间创建半连贯接口,可以增强热电性质.
- Sb-doping和Sb2Te3沉物有效地改善了电传输,同时分散了声子.
- 状原子重定向和接口设计对于推进热电材料的能量转换至关重要.
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