在MAPbBr中稳定极地域
Sayan Maity1, Suraj Verma1, Lavanya M Ramaniah2
1Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal 462 066, India.
The journal of physical chemistry letters
|June 8, 2023
概括
高压转化甲基化 (MAPbBr3) 结构,改变有机离子的行为,从类似液体的到有序的堆. 键和C-H···Br相互作用是这些压力诱导的相变的关键.
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
- 化学晶体学 化学晶体学
背景情况:
- 金属化物矿,如甲基化 (MAPbBr3),是光电子应用的有希望的材料.
- 了解它们对压力等外部刺激的结构反应对于设备的稳定性和性能至关重要.
研究的目的:
- 为了研究在室温下MAPbBr3的压力诱导的结构相变.
- 阐明甲基 (MA) 离子在水静压下的行为及其方向动态.
主要方法:
- 最初的分子动力学模拟用于研究MAPbBr3在0至2.8GPa的压力下.
- 分析的重点是结构变化,分子二极管定向和键相互作用.
主要成果:
- 在0.7 GPa (立方到立方) 和1.1 GPa (立方到四角形) 观察到两个不同的相位过渡.
- 马二极体从同otropic 转变为 oblate nematic 行为,其方向波动仅限于晶体平面.
- 在1.1 GPa以上,MA离子形成有序的堆与静态障碍,导致极和反极域,和CH3扭曲运动被抑制.
结论:
- 压力显著改变了MAPbBr3.3的晶体结构和分子动力学.
- 结合和C-H···Br相互作用在调解宿主-客体合和驱动观察到的相位过渡方面发挥着关键作用.
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