Issue 41, 2024

Interplay between connectivity and passivating agents in perovskite quantum dot networks

Abstract

Introducing quantum dots (QDs) as the active element of an optoelectronic device demands its incorporation in the shape of interconnected arrays that allow for some degree of electronic coupling in order to inject/extract charge carriers. In doing so, beyond reducing the degree of quantum confinement, carriers are exposed to an enhanced defect landscape as they can access adjacent QDs, which is at the origin of the strong reduction of photoluminescence observed in QD solids when compared to that of the isolated QDs. In this work we demonstrate how a proper defect passivating strategy or atmospheric treatment can greatly enhance charge diffusion in a QD film, needed for an optimal carrier injection/extraction demanded for optoelectronic applications, and also improved its stability against external radiation. From a fundamental perspective, we provide evidence showing that trap density distribution, rather than QD size distribution, is mostly responsible for the observed variations in emission decay rates present in the QD networks under analysis.

Graphical abstract: Interplay between connectivity and passivating agents in perovskite quantum dot networks

Supplementary files

Article information

Article type
Communication
Submitted
07 Jun 2024
Accepted
20 Sep 2024
First published
02 Okt 2024
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. C, 2024,12, 16683-16690

Interplay between connectivity and passivating agents in perovskite quantum dot networks

M. Morán-Pedroso, D. O. Tiede, C. Romero-Pérez, M. E. Calvo, J. F. Galisteo-López and H. Míguez, J. Mater. Chem. C, 2024, 12, 16683 DOI: 10.1039/D4TC02362E

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