Charge-Carrier Dynamics and Mobilities in Formamidinium Lead Mixed-Halide Perovskites

Waqaas Rehman, Rebecca L. Milot, Giles E. Eperon, Christian Wehrenfennig, Jessica L. Boland, Henry J. Snaith, Michael B. Johnston, Laura M. Herz

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The mixed‐halide perovskite FAPb(BryI1–y)3 is attractive for color‐tunable and tandem solar cells. Bimolecular and Auger charge‐carrier recombination rate constants strongly correlate with the Br content, y, suggesting a link with electronic structure. FAPbBr3 and FAPbI3 exhibit charge‐carrier mobilities of 14 and 27 cm2 V−1 s−1 and diffusion lengths exceeding 1 μm, while mobilities across the mixed Br/I system depend on crystalline phase disorder.
    Original languageEnglish
    Pages (from-to)7938-7944
    JournalAdvanced Materials
    Volume27
    Issue number48
    DOIs
    Publication statusPublished - 22 Dec 2015

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