Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.040
Publication date: 7th February 2022
Layer-by-layer (LBL) assembly is an appealing approach for the processing of nanoparticles and nanocolloids into thin films suitable for various applications1. One of the major advantages of this method is its simplicity: the process requires neither sophisticated hardware nor high-purity components. This simplicity is combined with the high quality of the resulting coatings, whose thicknesses can be controlled at the nanometer level. In the field of light-emitting diodes (LEDs), thickness of the emissive material film is very important to assure the copious recombination of the opposite charges injected with resulting high photoemission2. In addition, for Quantum Dot-based LEDs it’s crucial to have a good conductivity within the thin layer of emissive nanocrystals to facilitate the carrier mobility2. Therefore, to merge these two important requirements, we developed a ligand exchange process on CsPbX3 perovskite nanocrystal films which enables Layer-by-layer deposition.
We replaced, in solid state, oleate and oleylamine ligands (long insulant chains generally used for the synthesis of CsPbX3 nanocrystals), with Didodecyldimethylammonium Bromide, Ammonium Thiocyanate and other ligands that enhance the photoluminescence quantum yield and improve the performances of LEDs. The exchange has been carried out through a spin-coating technique, using solvents with strategic polarity to avoid NCs dissolution or damaging. Maintaining the quick and simple method of spin-coating, we deposited an increasing number of layers and, through AFM measurements, we noticed considerable thickening of material.
The easy handling of this twofold process makes it very attractive for a laboratory-to-industry scale-up transition and the potential applicability to many nanoscale materials opens the door to a large variety of layer permutations.
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