[23p-P02-1~13] 9.2 Nanoparticles, Nanowires and Nanosheets

▲ [23p-P02-11] Oriented Attachment of Lead Sulfide Colloidal Quantum Dots Superlattice Assembly

〇(D)Ricky Dwi Septianto^1,2, Retno Miranti¹, Nobuhiro Matsushita², Takaaki Hikima³, Yoshihiro Iwasa^1,4, Satria Zulkarnaen Bisri^1,2 (1.RIKEN CEMS, 2.Tokyo Inst. of Tech., 3.RIKEN Sprng-8 Center, 4.Univ. of Tokyo)

Keywords:Quantum dots, Oriented Assembly

In this study, we demonstrate facile control of lead sulfide (PbS) colloidal quantum dots (CQDs) assemblies to form large-scale superlattice with oriented attachment. By modifying the so-called liquid/air interfacial assembly method, we can control the process and the orientation of the CQD upon self-assembling. The formation of the CQD superlattices was investigated comprehensively using combinations of transmission electron microscopy (TEM/HR-TEM), grazing-incidence small-angle x-ray scattering (GISAXS), and grazing-incidence wide-angle x-ray scattering (GIWAXS) measurements. The strong correlations of both the electron microscopy and the x-ray scattering data suggest that the formed PbS CQDs solids are connected-superlattice structures with a high-degree of oriented attachment in a reproducible manner with variations of the constituent QD size. This achievement will therefore open a new capability to significantly enhance the electronic transport performance in the CQDs solids that will be more practical for many electronic device applications.