Coupling effects in QD dimers at sub-nanometer interparticle distance

Currently, intensive research efforts focus on the fabrication of meso-structures of assembled colloidal quantum dots (QDs) with original optical and electronic properties. Such collective features originate from the QDs coupling, depending on the number of connected units and their distance. Howeve...

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Published in:Nano research 2020-04, Vol.13 (4), p.1071-1080
Main Authors: Dibenedetto, Carlo Nazareno, Fanizza, Elisabetta, Brescia, Rosaria, Kolodny, Yuval, Remennik, Sergei, Panniello, Annamaria, Depalo, Nicoletta, Yochelis, Shira, Comparelli, Roberto, Agostiano, Angela, Curri, Maria Lucia, Paltiel, Yossi, Striccoli, Marinella
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Coupling
Dimers
Excitons
Fabrication
Materials Science
Nanotechnology
Optical properties
Quantum dots
Research Article
Steric hindrance
Stoichiometry
Surface chemistry
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Summary:Currently, intensive research efforts focus on the fabrication of meso-structures of assembled colloidal quantum dots (QDs) with original optical and electronic properties. Such collective features originate from the QDs coupling, depending on the number of connected units and their distance. However, the development of general methodologies to assemble colloidal QD with precise stoichiometry and particle-particle spacing remains a key challenge. Here, we demonstrate that dimers of CdSe QDs, stable in solution, can be obtained by engineering QD surface chemistry, reducing the surface steric hindrance and favoring the link between two QDs. The connection is made by using alkyl dithiols as bifunctional linkers and different chain lengths are used to tune the interparticle distance from few nm down to 0.5 nm. The spectroscopic investigation highlights that coupling phenomena between the QDs in dimers are strongly dependent on the interparticle distance and QD size, ultimately affecting the exciton dissociation efficiency.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-020-2747-3