具有高热电性能的立方AgMnSbTe3半导体
Yubo Luo1, Tian Xu1, Zheng Ma1
1State Key Laboratory of Materials Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
Journal of the American Chemical Society
|August 19, 2021
概括
从MnTe和AgSbTe2合成了一种新的半导体AgMnSbTe3. 这种材料具有出色的热电特性,包括高功率系数和1.46的峰值ZT,使其对能源应用具有前景.
科学领域:
- 材料科学
- 固态化学
- 热电器
背景情况:
- 热电材料对于废热回收和固态冷却至关重要.
- 开发具有高功率的新材料对于高效的热电设备至关重要.
研究的目的:
- 通过对MnTe与AgSbTe2进行反应,合成和描述一种新的半导体AgMnSbTe3.
- 研究AgMnSbTe3的结构,电子和热电特性.
主要方法:
- MnTe和AgSbTe2的等分反应
- 用于结构特征的X射线衍射和对分布函数分析.
- 光学带间隙测量
- 密度函数理论 (DFT) 的计算.
- 热电性能测量 (功率系数,热导率,ZT)
主要成果:
- AgMnSbTe3结晶成石盐NaCl结构,其离子具有统计分布.
- 该材料是一种p型半导体,光带间隙窄,约为0.36 eV.
- DFT的计算显示了热电性能有利的电子带结构.
- 颗粒边界的Ag2Te纳米颗粒对孔传输的影响是微不足道的.
- 在823K时达到~12.2μW cm−1 K−2的高功率系数和~0.34 W m−1 K−1的超低晶格导热率.
- 在823 K的峰值ZT为~1.46和400-823 K的平均ZT为~0.87.
结论:
- AgMnSbTe3是一个有前途的新型p型热电材料.
- 它的独特结构和电子特性有助于高热电性能.
- 这种材料具有高效的热电能转化潜力.
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