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通过时间分辨率红外光谱研究的批量和二维化佩洛夫斯基特的孔位定位

Daniel Sandner¹, Kun Sun², Anna Stadlbauer³

¹Chair for Laser and X-ray Physics, Physics Department, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Straße 1, 85748 Garching, Germany.

Journal of the American Chemical Society

|July 10, 2024

概括

使用时间分辨率红外光谱研究了矿薄膜中的电荷载体动态. 在3D和2D岩之间发现了驱动红外模式形成的洞.

科学领域:

材料科学
固态物理
光谱学

背景情况:

合物矿对光电学至关重要,其载体动力学影响其功能.
了解电荷载体散射,定位和极子形成是优化矿装置的关键.

研究的目的:

在3D和2D矿薄膜中研究光诱导晶格和载体动力学.
探测甲离子动态和对称性破坏在载体行为中的作用.
阐明不同矿结构中的电荷载体定位和稳定机制.

主要方法:

用时间分辨率的红外光谱来研究矿薄膜 (CsFAPbX3,X=I,Br).
分析了formamidinium (FA) 离子的CN拉伸模式,以了解晶格动态.
在室温和冷温度下进行了实验,包括对异构结构的研究.

主要成果:

在三维矿中出现了红外模式,与空间对称性破坏有关.
低温降低了载体局部化,支持动态失调驱动的机制.
2D Ruddlesden-Popper矿没有显示电荷定位特征,这表明其稳定机制与散装矿不同.
洞被确定为观察到的红外模式形成背后的驱动力.

结论:

电荷载体的行为和定位机制在3D和2D矿结构之间显著不同.
洞动态在矿中形成特定的红外模式中起着至关重要的作用.
这些发现提供了对矿光电子中电荷载体的基本过程的洞察力.

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