Dimensional Control of CsPbI<sub>3</sub> Perovskite Colloidal Nanocrystals by Surface Ligand Adjustment for Optoelectronic Devices
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Lead halide perovskite colloidal nanocrystals (PNCs) are attracting attention in various solution-processed optoelectronic devices due to their size- and composition-tunable optical bandgaps and excellent optoelectrical properties. This study demonstrates the synthesis of monodisperse CsPbI3-PNCs, including both 2D nanoplatelets and 3D nanocubes, via the SN2 reaction-based precursor conversion method. The dimensionality of the PNCs can be controlled by adjusting the quantity of surface ligands. This dimensional control is achieved by exploiting the competitive A-site cation substitution between protonated oleylamine (i.e., oleylammonium) and Cs+. A post-synthetic passivation approach is introduced to improve surface ligand passivation without affecting dimensionality. Our findings indicate that the optical bandgaps can be adjusted for solar cells and light-emitting diodes by dimensional controls, while simultaneously enhancing optical properties.