CsPbBr₃ Nanocrystal/MO₂ (M = Si, Ti, Sn) Composites: Insight into Charge-Carrier Dynamics and Photoelectrochemical...

Though coating CsPbBr₃ nanocrystal (NC) with an outer layer has been regarded as an effective strategy to address its instability issues, deep investigations into the electronic interaction between CsPbBr₃ NC and coating layer have yet to be conducted. In this study, the dynamics of hot carrier and charge carrier of CsPbBr₃ nanocrystal with various MO₂ (M = Si, Ti, Sn) coating layers have been comprehensively studied. Combined transient optical characterizations (time-resolved photoluminescence and ultrafast transient absorption) and photoelectrochemical measurements reveal that coating with insulating SiO₂ accelerates the hot carrier relaxation and enhances the radiative recombination by passivating surface traps, whereas efficient charge-carrier separation and extraction are observed after coating with SnO₂ and TiO₂. The electron injection from CsPbBr₃ NC to SnO₂ (1.14 × 10⁸ s^-1) is 2-fold faster than to TiO₂ (5.4 × 10⁷ s^-1) owing to the lower conduction band edge and the higher electron mobility of SnO₂. Particularly, the first time fabricated CsPbBr₃ NC/SnO₂ composite exhibits superior stability against UV light and moisture, as well as the best photocurrent response in this study. This work has implied that rational design of the coating layer for perovskite NC can not only improve the stability but also tailor the electronic and optoelectronic properties for various applications.