Publication date: 22nd July 2026
Ligands are small organic molecules that bind to nanocrystal surfaces and make them soluble, stable, and processable. In perovskite nanocrystal superlattices, ligands play many additional roles: they define surfaces, influence structure, reactivity, and optical properties. In this talk, I will discuss CsPbBr3 perovskite nanocrystals and their superlattices as systems in which ligands act as structural, chemical, and photophysical components.
I will discuss how the ligands influence superlattice structure, giving rise to structural coherence, periodic displacements, and structural transitions. Beyond structure, ligands also regulate optical properties. By controlling the spacing between nanocrystals, shorter and longer ligands tune the strength of electronic coupling between the nanocrystals. When weakly bound, ligands can promote nanocrystal coalescence and hydrolysis, leading to loss of quantum confinement and the formation of localized lower-bandgap domains that act as energy funnels. When chiral ligands are used, weak ligand-induced chirality can be converted into measurable circularly polarized luminescence in superlattices.
Together, these examples show that ligands determine what perovskite nanocrystal superlattices may become: single-crystalline materials with dynamic structures, evolving stability, and emergent optical properties.
D.B. acknowledges the support from the European Union, ERC Starting Grant PROMETHEUS, project no. 101039683. Views and opinions expressed are, however, those of the author only and do not necessarily reflect those of the European Union or the European Research Council Executive Agency. Neither the European Union nor the granting authority can be held responsible for them.
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