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

Thecharge transfer study from the excited state of MAPbBr(3) perovskite nanocrystals (PNCs) to molybdenum disulfide (MoS2) in chloroform solution is conducted using a fluorescenceapproach. Due to their exceptional properties and distinctive structures,transition metal dichalcogenides (TMDs) are promising candidates foroptoelectronic devices. In this study, we have combined hybrid organic-inorganicperovskite nanocrystals MAPbBr(3) with MoS2 solution.A significant electron transfer from MAPbBr(3) to MoS2 has been depicted by photoluminescence (PL) spectroscopy,time-correlated single-photon count (TCSPC), transient absorptionspectroscopy (TAS), and shortening of the absolute PL quantum yield(PLQY) of hybrid MAPbBr(3)/MoS2 nanocomposites.Fluorescence quenching of perovskite nanocrystals has shown an increasein quenching efficiency. The photoexcited charge transfer from MAPbBr(3) to adjacent MoS2 is further correlated using electrochemicaltests that compare reduction and oxidation potential. The resultsrevealed that MoS2 extracts the charge from the excitedstate of PNCs. This work demonstrates the charge transfer propertiesof hybrid halide perovskites with two-dimensional TMD materials. Acombination of these materials could help us to understand the actualpotency of MAPbBr(3) PNCs in their real applications.