Publication date: 15th May 2025
In recent years, lead halide perovskite (LHP) nanocrystals (NCs) have attracted significant attention due to their defect-tolerant nature, tunable and spectrally narrow emission, and facile colloidal synthesis.[1] Within this family of semiconductor NCs, atomically thin LHP nanoplatelets (NPLs) – featuring the optical anisotropy and a thickness-dependent bandgap – stand out as promising candidates for optoelectronic applications.[2] Further development of such metamaterials is, however, associated with several challenges: a) the compositional space remains largely unexplored, as existing reports are mainly limited to CsPbBr3 NPLs, while studies on hybrid organic-inorganic LHP NPLs are scarce; b) limited stability with respect to dilution, washing, and long-term storage, due to the high surface-to-volume ratio and insufficient surface passivation. To address these issues, a facile synthesis of monodisperse LHP NPLs, followed by ligand exchange using a newly developed library of organic ligands, is an avenue to explore. Notably, owing to their high degree of monodispersity both in lateral and thickness dimensions, the synthesized NPLs readily stack face-to-face into ordered superlattices, even in colloidal solution, thereby enhancing their stability. Of particular interest is the investigation of NPLs' optical properties at both the ensemble and single-dot level, with the aim of characterizing the underlying photophysics of these largely unexplored LHP NPLs.
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