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Ligands removal and photo-activation of CsPbBr3 quantum dots for enhanced optoelectronic devices

Abstract

Perovskite quantum dots have recently emerged as a promising light source for optoelectronic applications. However, integrating them into devices while preserving their outstanding optical properties remains challenging. Due to their ionic nature, perovskite quantum dots are extremely sensitive and degrade upon the simplest processes. To maintain their colloidal stability, they are surrounded by organic ligands, those prevent efficient charge carrier injection in devices and have to be removed. Here we report on a simple method where a moderate thermal process followed by an exposure to UV in air can efficiently remove ligands and increase the photo-luminescence of the room temperature synthesized perovskite quantum dots thin films. Annealing is accompanied by a red shift of the emission wavelength, usually attributed to a coalescence and irreversible degradation of the quantum dots. We show that it is actually related to a relaxation of the quantum dots upon a ligands removal, without creation of non-radiative recombining defects. The quantum dots surface, as devoid of ligands, is subsequently photo-oxidized and smoothened upon exposure to UV in air, which drastically enhance their photo-luminescence. This adequate combination of treatments improves by more than an order of magnitude the performances of perovskite quantum dots light emitting diodes.

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Publication details

The article was accepted on 29 Mar 2018 and first published on 03 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR01396A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Ligands removal and photo-activation of CsPbBr3 quantum dots for enhanced optoelectronic devices

    E. Moyen, A. Kanwat, S. Cho, H. Jun, R. Aad and J. Jang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01396A

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