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Formamidinium lead iodide shows a narrower bandgap than the commonly used methylammonium lead?iodide (1.48 eV compared to ~1.57 eV),?and hence lies closer to that favourable for optimum solar conversion efficiencies. With an approach of FAPbI3 crystallisation by the direct intramolecular?exchange of dimethylsulfoxide (DMSO) molecules intercalated in PbI2 with formamidinium?iodide, device with performance over 20% has been fabricated.

Formamidinium iodide is one of the most common precursors used in the preparation of perovskite-based opto-electronic systems, including light-emitting diodes (LEDs) and perovskite solar cells (PSCs).

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