Proceedings of Online Meetup - Beyond Lead Halide Perovskites: Syntheses and Applications of Metal Halide Semiconductors (MABP)
Publication date: 23rd April 2020
Lead-free double perovskites such as Cs2AgBiBr6 are gaining attention because of their environmental friendliness compared to the lead halide perovskites. The Cs2BiAgBr6 QDs exhibit rich excited state dynamics and when adsorbed onto semiconductor oxides they induce ultrafast charge injection process. Whereas the electron transport layer such as TiO2 or ZnO facilitate transport of electrons to the collecting surface, it can also indirectly induce surface oxidation of QDs if holes are allowed to accumulate. Under steady state photolysis (ambient conditions) the electrons injected into TiO2 are scavenged by atmospheric oxygen, leaving behind holes which accumulate within the quantum dots (QDs). These accumulated holes further induce oxidation of QDs, resulting in the overall photodegradation of perovskite film. In order to establish their photoactivity, we have probed the excited state behavior of Cs2AgBiBr6 nanocrystals and charge injection from their excited state into different metal oxides (TiO2, ZnO). The electron transfer rate constants determined from ultrafast transient absorption spectroscopy were in the range of 1.2–5.2 × 1010 s-1. Annealed films of Cs2AgBiBr6 nanocrystals, when employed as an active layer in solar cell, delivered photocurrent under visible light excitation. Although Cs2BiAgBr6 is attractive as lead free perovskite materials, the photovoltaic performance remains rather poor. New strategies are needed to implement these double perovskites in solar cells in a more effective way
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