Controlling the dimension of the quantum resonance in CdTe quantum dot superlattices fabricated via layer-by-layer assembly

TaeGi Lee, Kazushi Enomoto, Kazuma Ohshiro, Daishi Inoue, Tomoka Kikitsu, Kim Hyeon-Deuk, Yong-Jin Pu () and DaeGwi Kim ()
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TaeGi Lee: Osaka City University
Kazushi Enomoto: RIKEN Center for Emergent Matter Science (CEMS)
Kazuma Ohshiro: Osaka City University
Daishi Inoue: RIKEN Center for Emergent Matter Science (CEMS)
Tomoka Kikitsu: RIKEN Center for Emergent Matter Science (CEMS)
Kim Hyeon-Deuk: Kyoto University
Yong-Jin Pu: RIKEN Center for Emergent Matter Science (CEMS)
DaeGwi Kim: Osaka City University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract In quantum dot superlattices, wherein quantum dots are periodically arranged, electronic states between adjacent quantum dots are coupled by quantum resonance, which arises from the short-range electronic coupling of wave functions, and thus the formation of minibands is expected. Quantum dot superlattices have the potential to be key materials for new optoelectronic devices, such as highly efficient solar cells and photodetectors. Herein, we report the fabrication of CdTe quantum dot superlattices via the layer-by-layer assembly of positively charged polyelectrolytes and negatively charged CdTe quantum dots. We can thus control the dimension of the quantum resonance by independently changing the distances between quantum dots in the stacking (out-of-plane) and in-plane directions. Furthermore, we experimentally verify the miniband formation by measuring the excitation energy dependence of the photoluminescence spectra and detection energy dependence of the photoluminescence excitation spectra.

Date: 2020
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DOI: 10.1038/s41467-020-19337-0

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