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(a) Temperature dependence of the PL signal of FAPb0.55Sn0.45I3 perovskite. (b) Temperature dependence of the optical band gap determined from the PL data of the same sample. Arrow marks the phase transition point. (c) Temperature–composition phase diagram of the tetragonal–orthorhombic phase transition in FAPb1–xSnxI3 system. Reprinted (adapted) with permission from ref (89). Copyright 2018 Wiley-VCH.
