Ultrafast Carrier Dynamics of Dual Emissions from Orthorhombic Phase in Methylammonium Lead Iodide Perovskites Revealed by Two-Dimensional Coherent Spectroscopy.
Ultrafast Carrier Dynamics of Dual Emissions from Orthorhombic Phase in Methylammonium Lead Iodide Perovskites Revealed by Two-Dimensional Coherent Spectroscopy.
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二维相干光谱揭示甲铵碘化铅钙钛矿中正交相双发射的超快载流子动力学。
DOI：
10.1021/acs.jpclett.9b01583
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Hebin Li
中科院分区：
文献类型：
--
作者：
Michael Titze;Chengbin Fei;Maria F. Munoz;Xuewen Wang;He Wang;Hebin Li
对有机-无机杂化钙钛矿的光激发景观和动力学的基本了解对于提高其在太阳能电池和其他应用中的性能至关重要。钙钛矿中斜方相的双重发射特征一直是近期众多研究的焦点，但其潜在的分子起源仍然难以捉摸。我们使用光学二维相干光谱来研究 115 K 甲基铵碘化铅薄膜中的载流子动力学和双发射耦合。二维光谱揭示了光激发载流子在 250 fs 内超快重新分布为两个发射共振。高能共振是短暂的瞬态，低能发射态与相干声子相互作用。观察到的载流子动力学提供了重要的实验证据，可以与潜在的理论模型进行比较，并有助于理解有机-无机杂化钙钛矿的双发射以及整体能级结构。
The fundamental understanding of photoexcitation landscape and dynamics in hybrid organic-inorganic perovskites is essential for improving their performance in solar cells and other applications. The dual emission features from the orthorhombic phase in perovskites have been the focus of numerous recent studies and yet their underlying molecular origin remains elusive. We use optical two-dimensional coherent spectroscopy to study the carrier dynamics and coupling of the dual emissions in a methylammonium lead iodide film at 115 K. The 2D spectra reveal an ultrafast redistribution of the photoexcited carriers into the two emission resonances within 250 fs. The high-energy resonance is a short-lived transient state and the low-energy emission state interacts with coherent phonons. The observed carrier dynamics provide important experimental evidence that can be compared with potential theoretical models and contribute to the understanding of the dual emissions as well as the overall energy level structure in hybrid organic-inorganic perovskites.
影响因子：
9
作者：
Panzer, Fabian;Baderschneider, Sebastian;Koehler, Anna
通讯作者：
Koehler, Anna