Efficient Charge Transfer From CsPbBr₃ Nanocrystals to Free Base Tricyanophenyl Corroles

The optoelectronic properties of lead halide perovskite nanocrystals (NCs) have garnered significant research interest over the past few years. Herein, we investigated an efficient charge transfer process associated with exciton dynamics between the lead halide perovskite NCs and 5,10,15-tris(4-cyanophenyl)corrole (TCPC). TCPC extracts the holes from the CsPbBr₃ NCs, resulting in photoluminescence (PL) quenching of CsPbBr₃ NCs. The change in PL intensity and lifetime due to charge transfer was investigated using PL and UTAS analysis. Our study suggested that the quenching of PL intensity is due to the combination of static and dynamic quenching mechanisms. The optical and structural analyses confirm that the charge transfer process occurred without degradation of the perovskite NCs. Along with UTAS, the PL quenching is further investigated using the XPS, UPS, and absolute photoluminescence quantum yield (PLQY), which confirms the charge transfer dynamics between CsPbBr₃ and TCPC.