Metallic Behaviour of Semiconducting Colloidal Quantum Dots (RIKEN, Others)


A technical paper titled “Enabling metallic behaviour in two-dimensional superlattice of semiconductor colloidal quantum dots” was published by researchers at RIKEN Center for Emergent Matter Science (CEMS), Tokyo Institute of Technology, RIKEN SPring-8 Center, The University of Tokyo, and Tokyo University of Agriculture and Technology.


“Semiconducting colloidal quantum dots and their assemblies exhibit superior optical properties owing to the quantum confinement effect. Thus, they are attracting tremendous interest from fundamental research to commercial applications. However, the electrical conducting properties remain detrimental predominantly due to the orientational disorder of quantum dots in the assembly. Here we report high conductivity and the consequent metallic behaviour of semiconducting colloidal quantum dots of lead sulphide. Precise facet orientation control to forming highly-ordered quasi-2-dimensional epitaxially-connected quantum dot superlattices is vital for high conductivity. The intrinsically high mobility over 10 cm2 V−1 s−1 and temperature-independent behaviour proved the high potential of semiconductor quantum dots for electrical conducting properties. Furthermore, the continuously tunable subband filling will enable quantum dot superlattices to be a future platform for emerging physical properties investigations, such as strongly correlated and topological states, as demonstrated in the moiré superlattices of twisted bilayer graphene.”

Find the technical paper here. Published: May 2023.

Septianto, Ricky Dwi, Retno Miranti, Tomoka Kikitsu, Takaaki Hikima, Daisuke Hashizume, Nobuhiro Matsushita, Yoshihiro Iwasa, and Satria Zulkarnaen Bisri. “Enabling metallic behaviour in two-dimensional superlattice of semiconductor colloidal quantum dots.” Nature Communications 14, no. 1 (2023): 2670.

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