Long-lived hot-carrier light emission and large blue shift in formamidinium tin triiodide perovskites

Abstract : A long-lived hot carrier population is critical in order to develop working hot carrier photovoltaic devices with efficiencies exceeding the Shockley–Queisser limit. Here, we report photoluminescence from hot-carriers with unexpectedly long lifetime (a few ns) in formamidinium tin triiodide. An unusual large blue shift of the time-integrated photoluminescence with increasing excitation power (150 meV at 24 K and 75 meV at 293 K) is displayed. On the basis of the analysis of energy-resolved and time-resolved photoluminescence, we posit that these phenomena are associated with slow hot carrier relaxation and state-filling of band edge states. These observations are both important for our understanding of lead-free hybrid perovskites and for an eventual future development of efficient lead-free perovskite photovoltaics.
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Hong-Hua Fang, Sampson Adjokatse, Shuyan Shao, Jacky Even, Maria Antonietta Loi. Long-lived hot-carrier light emission and large blue shift in formamidinium tin triiodide perovskites. Nature Communications, Nature Publishing Group, 2018, 9, pp.243. ⟨10.1038/s41467-017-02684-w⟩. ⟨hal-01685391⟩

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