We demonstrate that we can convert hybrid perovskites between methylammonium lead iodide (MAPbI ₃ ) and formamidinium lead iodide (FAPbI ₃ ) by immersion in solutions of MA or FA iodide at room temperature. The cations diffuse uniformly throughout the bulk films, forming an alloy rather than a bi-layer. Furthermore, this demonstrates good organic cation mobility in these materials.
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Eperon et al. (2015) studied this question.
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