Ultra-stable Core/Shell Perovskite Nanocrystal via Ligand assisted lattice structure stabilize for Light-emitting diode
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Perovskite nanocrystals(PNCs) have attracted significant attention for their outstanding optoelectrical properties. Despite their unique advantages, PNCs show poor structure stability due to dynamic binding of ligands and high surface defects in terms of halide vacancies. To overcome this issue, attempts to improve the stability of quantum dots through Core/Shell structures have been reported for traditional quantum dots, such as metal chalcogenides. Here, we demonstrate CsPbBr3/ZnS Core/Shell structure for long-term moisture stability. Despite the general stability of ZnS, ZnS is unstable on the perovskite surface, which is due to the interfacial lattice mismatch between ZnS and CsPbBr3. Our synthesis approach can stabilize ZnS structure with surface ligand treatment and near-unity optical properties were achieved by suppressing the aggregation of perovskite nanocrystals through halide-rich conditions and reducing surface defects.