Rashba Effect and Spin-Dependent Excitonic Properties in Chiral Two-Dimensional/Three-Dimensional Composite Perovskite Films,The Journal of Physical Chemistry Letters

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Rashba Effect and Spin-Dependent Excitonic Properties in Chiral Two-Dimensional/Three-Dimensional Composite Perovskite Films
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2023-12-18 , DOI: 10.1021/acs.jpclett.3c03247
Junzi Li _{1,

2} , Zhihang Guo ₁ , Yan Qin ₁ , Rulin Liu ₃ , Yejun He ₂ , Xi Zhu ₃ , Fuming Xu ₄ , Tingchao He ₁

Affiliation

Among various chiral semiconductor materials, chiral two-dimensional (2D)/three-dimensional (3D) composite perovskites (CPs) offer the benefits of strong interface asymmetry and energy transfer between 2D and 3D phases, making the chiral CPs promising for spintronic devices. Therefore, understanding their spintronic properties will be greatly important for expanding their relevant applications. In this work, we synthesized one pair of chiral 2D/3D CP films. Their Rashba effect and spin relaxation process have been investigated by polarization-dependent femtosecond transient absorption spectroscopy. Interestingly, under left- and right-handed circularly polarized light (CPL) excitation, a two-photon emission intensity difference is observed in chiral 2D/3D CP films at 298 K. This work sheds light on the spin-dependent excitonic characteristics of chiral 2D/3D CPs and confirms the feasibility of their application in near-infrared CPL detection.

中文翻译：

手性二维/三维复合钙钛矿薄膜中的拉什巴效应和自旋相关激子性质

在各种手性半导体材料中，手性二维（2D）/三维（3D）复合钙钛矿（CP）具有强界面不对称性以及2D和3D相之间能量转移的优点，使得手性CP在自旋电子器件中具有广阔的应用前景。因此，了解它们的自旋电子特性对于扩展其相关应用非常重要。在这项工作中，我们合成了一对手性 2D/3D CP 薄膜。它们的拉什巴效应和自旋弛豫过程已经通过偏振相关的飞秒瞬态吸收光谱进行了研究。有趣的是，在左旋和右旋圆偏振光 (CPL) 激发下，在 298 K 的手性 2D/3D CP 薄膜中观察到双光子发射强度差异。这项工作揭示了手性 2D/3D CP 薄膜的自旋相关激子特性。 2D/3D CP 并证实了其在近红外 CPL 检测中应用的可行性。

更新日期：2023-12-18

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