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The outstanding performance of organic-inorganic metal trihalide solar cellsbenefits from the exceptional photo-physical properties of both electrons andholes in the material. Here, we directly probe the free-carrier dynamics inCs-doped FAPbI3 thin films by spatiotemporal photoconductivity imaging. Usingcharge transport layers to selectively quench one type of carriers, we showthat the two relaxation times on the order of 1 microsecond and 10 microsecondscorrespond to the lifetimes of electrons and holes in FACsPbI3, respectively.Strikingly, the diffusion mapping indicates that the difference inelectron/hole lifetimes is largely compensated by their disparate mobility.Consequently, the long diffusion lengths (3 ~ 5 micrometers) of both carriersare comparable to each other, a feature closely related to the unique chargetrapping and de-trapping processes in hybrid trihalide perovskites. Our resultsunveil the origin of superior diffusion dynamics in this material, cruciallyimportant for solar-cell applications.

Superior Photo-carrier Diffusion Dynamics in Organic-inorganic Hybrid Perovskites Revealed by Spatiotemporal Conductivity Imaging