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. 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. 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 films. Annealed films of Cs2AgBiBr6 nanocrystals, when employed as an active layer in solar cells, delivered photocurrent under visible-light excitation.
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