Abstract
FAPbI3 and FA(Mn:Pb)I3 perovskite films were prepared and evaluated through steady and transient absorption spectroscopy. According to the analysis using Elliot’s model, there were no considerable differences except for the absorption intensity between FAPbI3 and FA(Mn:Pb)I3 perovskite films: the value of the optical gap (Eg) and the position of exciton resonance (E0) were the same. The femtosecond transient absorption showed biexponential relaxation properties of the charge carriers, suggesting that biexcitons are more easily generated in FA(Mn:Pb)I3 than FAPbI3 perovskite. The generation of biexcitons in FA(Mn:Pb)I3 was also confirmed by the photon pump fluence dependence. Moreover, we were able to estimate the average number of absorbed photons directly from the photon pump power dependence without needing any further experimental measurements such as photoluminescence. Our findings may offer a new way of understanding photoinduced carrier dynamics in perovskite manganites.
Highlights
Formamidinium lead iodide (FAPbI3) has attracted substantial attention [1]-[12]
Our findings may offer a new way of understanding photoinduced carrier dynamics in perovskite manganites
MA(Mn:Pb)I3 has been studied by Nafradi et al, and they found that photo-excited electrons melt the local magnetic order in the ferromagnetic photovoltaic MA(Mn:Pb)I3 [14]
Summary
Formamidinium lead iodide (FAPbI3) has attracted substantial attention [1]-[12]. The band gap of FAPbI3 allows for broader absorption of the solar spectrum relative to MAPbI3. Perovskite solar cells (PSCs) with photo conversion efficiencies (PCEs) of >25% mainly use FAPbI3-dominated. Perovskite manganites may provide a useful material platform for new magnetic materials [13]. Relevant materials may emerge when magnetic interactions of spins are present and competing to determine the ground state [15]. This may provide potential for realizing magnetic bits, information storage, and increased manipulation speed [14] [16] [17]. A deeper understanding of charge generation, exciton dissociation, trapping and recombination in photovoltaic manganite perovskites is needed to unravel the operating mechanism
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