[23a-B102-1~9] CS.9 Code-sharing Session of 8.3 & 9.2 & 13.6

▲ [23a-B102-4] Delocalized Charge Carrier Transport in Epitaxially-Connected Semiconductor Quantum Dot Superlattices

〇Satria Zulkarnaen Bisri^1,2, Ricky Dwi Septianto^1,2, Retno Miranti¹, Takaaki Hikima³, Nobuhiro Matsushita², Yoshihiro Iwasa^1,4 (1.RIKEN CEMS, 2.Tokyo Inst. Tech., 3.RIKEN SPring8 Center, 4.Univ. Tokyo)

Keywords:colloidal quantum dots, quasi-two-dimensional materials, band transport

Assembling colloidal quantum dots into coherent “single-crystal” superstructures has become a major scientific challenge in nanoscience and nanotechnology. Recently, combining the selective ligand stripping process, large-scale oriented assembly, and facet-driven epitaxial connections made us capable of forming epitaxially-connected quasi-two-dimensional superlattices of PbS colloidal QDs with enhanced electronic conductivity. Here we demonstrate continuous tuning of charge carrier density and Fermi level in the epitaxially-connected quasi-two-dimensional PbS QD superlattice, by which metallic-like delocalized charge transport behavior is observed at high carrier density. This observation shows a promising way to establish colloidal QD as a platform for quantum physics studies and to improve the optoelectronic functionalities of colloidal QD devices.