Publication date: 15th December 2025
Ordered assemblies of nanocrystals, called supercrystals, exhibit collective quantum phenomena, such as superfluorescence, arising from coupling between neighboring crystals [1]. In particular, lead-halide perovskite supercrystals have emerged as promising candidates for applications including light-emitting diodes, electro-optical modulators, and detectors for visible and X-ray radiation. However, the soft ligand shell surrounding individual nanocrystals makes the superlattice susceptible to structural defects, which diminish structural coherence and, consequently, affect their physical properties [2].
Advances in synchrotron sources and X-ray optics now make it possible to focus an X-ray beam to below 100 nm while maintaining sufficient intensity to record diffraction patterns. This enables spatially resolved characterization of these materials, providing insight into both the local superlattice structure and the atomic lattice of constituent nanocrystals [3]. Such capabilities allow direct correlation between supercrystal structure and their optical, electrical, and mechanical behavior. In this talk, we compare perovskite supercrystals synthesized via solvent-evaporation and two-layer phase-diffusion methods, highlighting how structural differences arising from these routes influence their material properties [4,5,6].
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