Energetically, α-FAPbI 3 is higher in energy by 0.261 eV per formula unit than the δ-phase, which agrees with the experimental findings 4, 8, 9, 10 of the metastable nature of the desired α-phase of ...

The size of nanocrystals estimated for maximum intensity peak, using Debye-Scherrer formula D = 0.9λ/ β cos θ is 17.41 nm, 21.57 nm and 23.29 nm for NP, NS and NF, respectively; with an average ...