稳定效应和离子迁移在3D"空洞"化
K Jayanthi1, Ioannis Spanopoulos2,3, Nourdine Zibouche4
1School of Molecular Sciences and Navrotsky Eyring Center for Materials of the Universe, Arizona State University, Tempe, Arizona 85287, United States.
Journal of the American Chemical Society
|April 28, 2022
概括
具有乙二的新型"空洞"矿显示可调节的特性和增强的稳定性. 热化学研究显示胺矿更稳定,尽管存在空位缺陷,但稳定这些材料.
科学领域:
- 材料科学
- 固态化学
- 矿的研究
背景情况:
- 一种新型的3D化物矿,称为"空洞"矿,由于显著的Pb和X空缺而表现出独特的特性.
- 在矿结构中加入乙烯二 (en) 离子会产生这些空白,从而使光学,电子和运输特征的微调成为可能.
- 这些"空洞"矿表现出有前途的环境稳定性,而这种稳定性则受到矿的负荷的影响.
研究的目的:
- 在"空洞"矿中观察到的增强稳定性的热化学起源.
- 阐明乙烯二 (en) 合并对不同化组成的能量景观和稳定性的作用.
- 检查空隙缺陷对这些材料离子迁移的影响.
主要方法:
- 使用室温溶液热量计的详细热化学研究.
- 用密度函数理论 (DFT) 模拟来计算形成能量.
- 分析了三个特定的"空洞"矿系统: en/FAPbI3, en/MAPbI3和 en/FAPbBr3.
主要成果:
- 化物"空洞"矿 (en/FAPbBr3) 与其化物对应物 (en/FAPbI3) 相比,具有更高的能量稳定性.
- 由于3D尺寸的差异,FAPbI3的稳定性随着纳入而增加,而FAPbBr3的稳定性则下降.
- 由随机的阴离子和阴离子空位产生的结构,对这些"空洞"矿结构的整体稳定性有着显著的贡献.
结论:
- "空洞"矿的稳定性是形成的复杂相互作用,阴离体诱导的结构变化和配置.
- 乙烯二 (en) 载荷影响离子迁移,而含量增加导致迁移能量障碍降低.
- 这些发现为新的矿材料的设计和稳定性提供了关键的见解.
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