Probing the Electron Transfer Behavior from Excited State Organometal Lead Halide Perovskite Nanocrystals to Molybdenum Disulfide Nanoflowers

The charge transfer study from the excited state of MAPbBr 3 perovskite nanocrystals (PNCs) to molybdenum disulfide (MoS 2 ) in chloroform solution is conducted using a fluorescence approach. Due to their exceptional properties and distinctive structures, transition metal dichalcogenides (TMDs) are promising candidates for optoelectronic devices. In this study, we have combined hybrid organic–inorganic perovskite nanocrystals MAPbBr 3 with MoS 2 solution. A significant electron transfer from MAPbBr 3 to MoS 2 has been depicted by photoluminescence (PL) spectroscopy, time-correlated single-photon count (TCSPC), transient absorption spectroscopy (TAS), and shortening of the absolute PL quantum yield (PLQY) of hybrid MAPbBr 3 /MoS 2 nanocomposites. Fluorescence quenching of perovskite nanocrystals has shown an increase in quenching efficiency. The photoexcited charge transfer from MAPbBr 3 to adjacent MoS 2 is further correlated using electrochemical tests that compare reduction and oxidation potential. The results revealed that MoS 2 extracts the charge from the excited state of PNCs. This work demonstrates the charge transfer properties of hybrid halide perovskites with two-dimensional TMD materials. A combination of these materials could help us to understand the actual potency of MAPbBr 3 PNCs in their real applications.