Publication date: 18th August 2023
Lead halide perovskites (LHPs) in the form of nanocrystals (NCs) are currently receiving significant attention for a variety of optoelectronics applications due to their fascinating characteristics, including defect tolerance, near-unity photoluminescence quantum yield, and adjustable emission throughout the entire visible wavelength range. These properties make them a promising candidate for use in various applications. The band gaps of LHP NCs can be tuned by both size-dependent quantum confinement effects and composition, whereas LHP NCs with anisotropic shapes have additional flexibility due to their geometry-specific optical properties, such as spatial confinement of excitons in one or two dimensions, efficient charge separation, highly polarized emission and radiative decay, allowing their application in classical and quantum light sources. While most studies focused on cubic or polyhedral NCs, we present a simple method for synthesizing CsPbBr3 nanorods that allows precise control over their size and aspect ratio by inhibiting specific facet growth due to the ligand-induced selective surface binding. . We have successfully produced CsPbBr3 NRs ranging in thickness from 5 to 24 nm and aspect ratios between 1 and 16. Precise optical characterization of the nanorods is possible by ligand designs that provide sufficient colloidal stability.
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