激子
俘获
极化(电化学)
重组
材料科学
超快激光光谱学
钙钛矿(结构)
光谱学
分子物理学
光电子学
各向异性
凝聚态物理
化学物理
化学
结晶学
光学
物理
物理化学
基因
生物
量子力学
生物化学
生态学
作者
Supriya Ghosh,Bapi Pradhan,Yiyue Zhang,Debkumar Rana,Denys Naumenko,Heinz Amenitsch,Johan Hofkens,Arnulf Materny
标识
DOI:10.1021/acs.jpcc.1c01318
摘要
Two-dimensional (2D) perovskites with alternating cations in the interlayer space (ACI) represent a new type of structure with different physical properties compared to the more common Ruddlesden–Popper (RP) counterparts. Still, there is a lack of understanding of photophysical and optoelectronic properties. In our work, we have used transient absorption spectroscopy to get better insight into the nature of photoexcitations in ACI perovskites with varying layers. We observed that multiple exciton recombination predominates, compared to self-trapping of excitons, with increasing the number of layers (expressed by n). With decreasing n, the ACI perovskite shows less many-body exciton recombination due to a very fast self-trapping of the excitons. Furthermore, we observed that the optical anisotropy increases with increasing number of the inorganic layers as the polarization orientation increases. Comparing the photophysical properties of the three different systems, we suggest that ACI3 is most promising for photovoltaic and optical polarization devices.
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