Associate Prof. Xiao Liu and Prof. Byung-Ryool Hyun cooperated to obtain a highly ordered and densely packed PbS quantum dot superlattice at the micron scale by using the self-assembly of PbS quantum dot nanocrystals and studied the effect of long-range ordering on the photoelectric properties of the formation of mesocrystalline PbS quantum dot superlattice detectors. Compared with the disordered quantum dot structure obtained by spin coating and the tightly packed superlattice obtained by solvent volatilization, the orientation of the mesocrystalline superlattice improves the electron delocalization and coupling and shows excellent photoelectric detection performance. This increase in performance is attributed to the ordered arrangement of atoms between quantum dots, which enhances the delocalized coupling of electrons. This study indicates that the mesocrystalline superlattice has a broad application prospect in the next generation of quantum dot optoelectronic devices. The research results were published online in the high-impact journal of "Small" on April 17 2023 with the title of "Adjusting Microscale to Atomic-Scale Structural Order in PbS Nanocrystal Superlattice for Enhanced Photodetector Performance".