A facile strategy to prepare monodisperse nanocrystals with initiative assembly into superlattice

A facile green strategy, low temperature in-situ chemical conversion, is reported to prepare nanocrystals with initiative “bottom-up” assembly into large-scale superlattice. The appropriate organic chalcogen precursors were chosen to control the kinetics of these reactions to keep monodisperse morphology. They also provide the capping ligands to acquire van der Waals interactions between ligands and dipole moment to self-assemble into large-scale superlattice. This strategy could flexibly modulate the composition of semiconductor nanostructures, such as cations, anions and even the heterostructures with metal nanoparticles. This bottom-up assembly behavior is necessary for the development of optoelectronic devices of II–VI semiconductor nanocrystals.