Fate of Optical Excitons in FAPbI₃ Nanocube Superlattices.

ABSTRACT: Understanding the nature of the photoexcitation and ultrafast charge dynamics pathways in organic halide perovskite nanocubes and their aggregation into superlattices is key for potential applications as tunable light emitters, photon-harvesting materials, and light-amplification systems. In this work, we apply two-dimensional coherent electronic spectroscopy (2DES) to track in real time the formation of near-infrared optical excitons and their ultrafast relaxation in CH(NH₂)₂PbI₃ nanocube superlattices. Our results unveil that the coherent ultrafast dynamics is limited by the combination of the inherent short exciton decay time (≃40 fs) and the dephasing due to the coupling with selective optical phonon modes at higher temperatures. On the picosecond time

SUBMITTER: Milloch A 

PROVIDER: S-EPMC11414601 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature