Charge Transfer in Amine-Free CsPbBr3 Perovskite Nanocrystals and Organic Hole-Acceptor Hybrid Structures

Outstanding optoelectronic properties of cesium lead bromide (CsPbBr3) perovskite nanocrystals (PNCs) are recognized in various photonic devices. The surface chemistry of PNCs determines the excited states of PNCs, and their interactions with charge drive redox-active molecules. Here, we have investigated the potential difference between the surface mod-ification of different CsPbBr3-based PNCs (amine-free and amine-based) with the hole-accepting organic molecule, i.e., 7,7-diethyl-5,7-dihydroindeno[2,1-b] carbazole (SPS-IND-Cbz). We have evaluated photoinduced hole transfer (PHT) with the steady-state photoluminescence and lifetime decay curves. Excitingly, the resulting PHT in amine-free CsPbBr3 PNC was nearly twice that of the amine-based CsPbBr3 PNC. Further, we have studied the photocurrent density of amine-free CsPbBr3 PNCs in the newly introduced organic molecule (SPS-IND-Cbz), enhancing the photocurrent responsivity, which could open a promising perspective for implementing these fascinating materials in various photonic strategies.