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- W4200330411 abstract "Short-ligands passivated metal halide perovskite nanocrystal (NC) films are promising candidates for achieving high-performance optoelectronic devices such as detectors. Efficient exciton diffusion is central to this goal. Herein, we investigate the exciton diffusion length of propionic acid and butylamine passivated CsPbBr3 NC film by quantifying the depth distribution of the excitons. This is achieved by the photoluminescence (PL) measurement of NC films with various thicknesses in transmission mode under a continuous excitation over the entire surface. Our results reveal that the exciton diffusion length of such an NC film reaches up to 2.16 ± 0.18 μm, which is enabled by the predominant multiple events of photon recycling-exciton hopping with the respective contributions of 81.1% and 18.9%. A further analysis unveils that the exciton hopping of such an NC film is beyond what dipole–dipole interaction alone can achieve, pointing to the participation of the shorter-range nonradiative energy-transfer pathways for the closely spaced NCs and even the facet-sharing NCs (0 ≤ d < 1 nm). This work provides a promising avenue toward a fast exciton diffusion length evaluation based on simple PL measurements of NC films. Besides, this work also offers inspiration to potential applications involving short-ligands passivated perovskite NCs for the future." @default.
- W4200330411 created "2021-12-31" @default.
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- W4200330411 date "2021-12-14" @default.
- W4200330411 modified "2023-10-18" @default.
- W4200330411 title "Probing the Exciton Diffusion Length of Short-Ligands Passivated Metal Halide Perovskite Nanocrystal Films" @default.
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- W4200330411 doi "https://doi.org/10.1021/acs.jpcc.1c07830" @default.
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