用超快激光光谱研究碘化铅钙钛矿中电子-声子耦合

2018 IEEE 18th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2018-07-01 DOI:10.1109/NANO.2018.8626311

V. Taylor, D. Tiwari, M. Duchi, P. Donaldson, I. Clark, D. Fermín, T. Oliver

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引用次数: 1

摘要

无机-有机卤化铅钙钛矿的高载流子迁移率先前被认为与薄膜内有机阳离子排列形成的铁电畴有关。[1]，[2]我们的二维红外超快光谱研究表明，有机阳离子在几皮秒内重新定向，因此铁电畴的形成非常不可能，也无法解释观察到的长载流子寿命[3]。互补时间分辨红外测量检测了传导带中的电子-声子耦合。对谱线形状的分析表明，载流子在仪器响应中形成极化子。

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Investigating Electron-Phonon Coupling in Formamidinium Lead Iodide Perovskite Using Ultrafast Laser Spectroscopy

The high charge carrier mobilities of hybrid inorganic-organic lead halide perovskites has previously been linked to ferroelectric domain formation due to alignment of organic cations within films. [1], [2] Our two-dimensional infrared ultrafast spectroscopy studies reveal that organic cations re-orient within several picoseconds, and therefore ferroelectric domain formation is very unlikely and unable to account for the observed long carrier lifetimes.[3] Complimentary time-resolved infrared measurements examined the electron-phonon coupling in the conduction band. Analysis of the spectral line shapes indicates that carriers form polarons within the instrument response.

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2018 IEEE 18th International Conference on Nanotechnology (IEEE-NANO)

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