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Publication - Dr Tom Oliver

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

    Citation

    Taylor, VC, Tiwari, D, Duchi, M, Donaldson, PM, Clark, IP, Fermin, DJ & Oliver, TA, 2019, ‘Investigating Electron-Phonon Coupling in Formamidinium Lead Iodide Perovskite Using Ultrafast Laser Spectroscopy’. in: 18th International Conference on Nanotechnology, NANO 2018. IEEE Computer Society

    Abstract

    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.

    Full details in the University publications repository