在p型AgSbTe2基材料中的热电传输性能通过热工程
Abdul Basit1, Tanveer Hussain2, Xin Li3
1Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong.
ACS applied materials & interfaces
|June 10, 2024
概括
锡/合金通过抑制杂质相稳定银反化 (AgSbTe2),显著提高热电性能. 这种高度的方法在757K时达到1.5的优点.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热电学是一种热电学.
背景情况:
- 基于银反化 (AgSbTe2) 的材料对热电应用具有前景.
- 存在Ag2Te杂质相阻碍了它们的热电性能.
- 了解和控制425K附近的相位过渡对于优化性能至关重要.
研究的目的:
- 通过Sn/Ge合金稳定AgSbTe2并提高其热电性能.
- 调查Sn/Ge添加对Ag2Te的可溶性极限和抑制的影响.
- 探索高对晶体结构和运输特性的影响.
主要方法:
- 合成AgSbTe2化合物与Sn/Ge合金使用化,化和热压.
- 结构性,电气性和热传输性能的表征.
- 密度函数理论 (DFT) 计算,以了解电子带结构和缺陷行为.
主要成果:
- Sn/Ge合金扩大了AgSbTe2中的可溶性极限到~30%,有效地抑制了Ag2Te.
- 一种具有高的Ag0.85Sn0.15Sb0.85Ge0.15Te2化合物表现出稳定的岩盐结构.
- 由于多价值带和减少的能量抵消,在757K时实现了~10.8μW cm−1 K−2的高功率系数.
- 由于引起的缺陷,格子的导热率下降,导致757K的功率值为1.5~.
结论:
- Sn/Ge合金是一种有效的策略,可以稳定AgSbTe2并提高热电性能.
- 高的方法可以抑制杂质相,并扩展热电材料的可溶性极限.
- 这项研究为优化IV-VI组材料的高热电效率提供了路线图.
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