2020/03/06 by Andre Maier, Maier, Andre, Dmitry Lapkin +31
Materials Science · #Quantum Dots Synthesis And Properties
paper · pdf · doi:10.48550/arxiv.2003.03266
Semiconductive nanocrystals (NCs) can be self-assembled into ordered\nsuperlattices (SLs) to create artificial solids with emerging collective\nproperties. Computational studies have predicted that properties such as\nelectronic coupling or charge transport are determined not only by the\nindividual NCs but also by the degree of their organization and structure.\nHowever, experimental proof for a correlation between structure and charge\ntransport in NC SLs is still pending. Here, we perform X-ray nano-diffraction\nand apply Angular X-ray Cross-Correlation Analysis (AXCCA) to characterize the\nstructures of coupled PbS NC SLs, which are directly correlated with the\nelectronic properties of the same SL microdomains. We find strong evidence for\nthe effect of SL crystallinity on charge transport and reveal anisotropic\ncharge transport in highly ordered monocrystalline hexagonal close-packed PbS\nNC SLs, caused by the dominant effect of shortest interparticle distance. This\nimplies that transport anisotropy should be a general feature of weakly coupled\nNC SLs.\n