Mechanism of ultrafast energy transfer between the organic–inorganic layers in multiple-ring aromatic spacers for 2D perovskites,Nanoscale

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Mechanism of ultrafast energy transfer between the organic–inorganic layers in multiple-ring aromatic spacers for 2D perovskites
Nanoscale ( IF 5.8 ) Pub Date : 2021-09-07 , DOI: 10.1039/d1nr04290d
Mahmoud M Elshanawany ₁ , Antonio Gaetano Ricciardulli ₂ , Michael Saliba _{3,

4} , Josef Wachtveitl ₁ , Markus Braun ₁

Affiliation

Lead halide based perovskite semiconductors self-assemble with distinct organic cations in natural multi-quantum-well structures. The emerging electronic properties of these two-dimensional (2D) materials can be controlled by the combination of the halide content and choice of chromophore in the organic layer. Understanding the photophysics of the perovskite semiconductor materials is critical for the optimization of stable and efficient optoelectronic devices. We use femtosecond transient absorption spectroscopy (fs-TAS) to study the mechanism of energy transfer between the organic and inorganic layers in a series of three lead-based mixed-halide perovskites such as benzylammonium (BA), 1-naphthylmethylammonium (NMA), and 1-pyrenemethylammonium (PMA) cations in 2D-lead-based perovskite thin films under similar experimental conditions. After optical excitation of the 2D-confined exciton in the lead halide layer, ultrafast energy transfer is observed to organic singlet and triplet states of the incorporated chromophores. This is explained by an effective Dexter energy transfer, which operates via a correlated electron exchange between the donating 2D-confined exciton and the accepting chromophore under spin conservation.

中文翻译：

二维钙钛矿多环芳族间隔区有机-无机层间超快能量转移机制

基于卤化铅的钙钛矿半导体在天然多量子阱结构中与不同的有机阳离子自组装。这些二维 (2D) 材料的新兴电子特性可以通过卤化物含量和有机层中生色团选择的组合来控制。了解钙钛矿半导体材料的光物理对于优化稳定高效的光电器件至关重要。我们使用飞秒瞬态吸收光谱 (fs-TAS) 来研究一系列三种铅基混合卤化物钙钛矿，如苄基铵 (BA)、1-萘基甲基铵 (NMA)、在类似的实验条件下，二维铅基钙钛矿薄膜中的 1-芘甲基铵 (PMA) 阳离子。在卤化铅层中的 2D 限制激子进行光学激发后，观察到超快能量转移到所结合发色团的有机单线态和三线态。这可以通过有效的 Dexter 能量转移来解释，它运行通过在自旋守恒下提供的二维限制激子和接受发色团之间的相关电子交换。

更新日期：2021-09-15

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