Organic–inorganic
hybrid perovskites such as MAPbI3 (MA+ = CH3NH3
+) have
emerged as promising materials for solar cells and light-emitting
devices. Despite their poor stability against moisture, perovskites
work as hydrogen-producing photocatalysts or photosensitizers in perovskite-saturated
aqueous solutions. However, the fundamental understanding of how chemical
species or support materials in the solution affect the dynamics of
the photogenerated charges in perovskites is still insufficient. In
this study, we investigated the photoluminescence (PL) properties
of MAPbI3 nanoparticles in aqueous media at the single-particle
level. A remarkable PL blinking phenomenon, along with significant
decreases in the PL intensity and lifetime compared to those in ambient
air, suggested temporal fluctuations in the trapping rates of photogenerated
holes by chemical species (I– and H3PO2) in the solution. Moreover, electron transfer from the excited
MAPbI3 to Pt-modified TiO2 proceeds in a concerted
fashion for photocatalytic hydrogen evolution under the dynamic solid–solution
equilibrium condition.
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