Tracking In-Situ Assembly of CsPbBr3 Nanocrystal Superlattices by Time-Resolved SAXS/WAXS

In this project, we propose to investigate the in-situ self-organization of lead halide CsPbBr3 perovskite nanocrystals (NCs) into ordered structures upon controlled solvent evaporation using simultaneous SAXS/WAXS measurements. A dedicated sample environment will be used for the evaporative assembly, which was demonstrated to be successful in our previous experiment at the ESRF, ID02. Besides studying of the assembly kinetics, we expect to investigate the role of the (i) size/shape, (ii) dispersion medium and (iii) surface ligand coverage on the self-assembly process. The underlying nanocrystals micro-structural packing details within perovskite NCs solution govern their macro-properties (i.e., carrier lifetime and lasing); the current proposal aims to bridge this gap in understanding to improve photonic properties.