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All mixed hybrid perovskite (MA(Sn, Pb)(Br,I) 3 ) thin film was fabricated by sequential vacuum evaporation method. To optimize the first layer with PbBr 2  and SnI 2 , we performed different annealing treatments. Further, MA(Sn, Pb)(Br, I) 3  thin film was synthesized on the optimized first layer by evaporating MAI and post-annealing. The formed hybrid perovskite thin film exhibited absorptions at 1.0 and 1.7 THz with small absorbance (<10%). Moreover, no chemical and structural defect-incorporated absorption was found. In this study, the possibility of changing terahertz absorption frequency through the mixture of metal cations (Sn +  and Pb + ) and halogen anions (Br −  and I − ) was verified.

frontiers in chemistry

Terahertz Wave Absorption Property of all Mixed Organic–Inorganic Hybrid Perovskite Thin Film MA(Sn, Pb)(Br, I)3 Fabricated by Sequential Vacuum Evaporation Method