Publication date: 15th December 2025
The surface chemistry of colloidal lead halide perovskite nanocrystals is remarkably rich. The chemically labile surfaces of these nanocrystals can be functionalized with a wide variety of ligands, some enhancing stability against degradation, others improving physical properties, or even imparting new functionalities. Because nanocrystals serve as building blocks for emergent materials, systematically varying their surface ligands offers a powerful route to study structure-property relationships across nanocrystal-based materials. This approach applies not only to nanocrystal dispersions, thin films, and composites, but also to ordered nanocrystal assemblies (superlattices). For example, depending on the assembly method, such as slow solvent evaporation or antisolvent diffusion, CsPbBr3 perovskite nanocrystal superlattices can exhibit markedly different mechanical and structural characteristics. In this talk, I will discuss our efforts to understand how mixed-ligand surface chemistry governs the stability and structural order of CsPbBr3 perovskite nanocrystal superlattices, and how these insights can inform the design of robust, functional nanocrystal solids.[1]
The work of D.B. was funded by the European Union (ERC StartingGrant PROMETHEUS, project no. 101039683). We acknowledge the MAX IV Laboratory for beamtime on the ForMAX beamline under proposal 20230363. Research conducted at MAX IV, a Swedish national user facility, is supported by Vetenskapsrådet (Swedish Research Council, VR) under contract 2018-07152, Vinnova (Swedish Governmental Agency for Innovation Systems) under contract 2018-04969 and Formas under contract 2019-02496.
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