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Synthesis of Organic–Inorganic Lead Halide Perovskite Nanoplatelets: Towards High-Performance Perovskite Solar Cells and Optoelectronic Devices
Recently, organic-based lead halide perovskites have received much attention for their high performance as light absorbers in thin-fi lm solar cells. [ 1–8 ] They exhibit not only a high optical absorption coeffi cient, optimal bandgap, and long electron/hole diffusion lengths, [ 9,10 ] which are advantageous for solar cells, but also good optical and electrical transport properties,making them suitable for other opto-electronic devices, such as, fi eld-effect transistors, light-emitting diodes, and photodetectors.[ 11–14 ] Although these structures were fi rst synthesized a long time ago, many intrinsic physical questions still remain unresolved for these types of material, such as, the nature of their excited states, the relative fraction of free and bound charge pairs, and the interplay between two species, as well as the question relating to the function of the halide atom towards the charge-transport behavior in the perovskite structure.
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