Organic Modification of CuInS2 Quantum Dots for Light-Emitting Applications

Spyros Orfanoudakis^a^,^b, Panagiotis Dallas^a, Athanassios Kontos^b, Apostolos Kalafatis^a, Thomas Stergiopoulos^a

^aInstitute of Nanoscience and Nanotechnology, NCSR Demokritos, 15341, Athens, Greece

^bSchool of Applied Mathematical and Physical Sciences, National Technical University Athens, 15780 Zografou, Athens, Greece

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)

I-III-VI Colloidal Nanocrystals and Derivatives: From Synthesis to Applications - #ChalcoQD

Sevilla, Spain, 2025 March 3rd - 7th

Organizer: Lukasz Klopotowski

Poster, Spyros Orfanoudakis, 615
Publication date: 16th December 2024

CuInS₂ quantum dots (CIS QDs) have garnered significant attention in recent years as non-toxic and air-stable candidates for light-emitting applications1,2. Their outstanding photoluminescence properties and the ability to easily tune the PL peak from green to infrared make CIS-QDs an appealing material for LED applications. Nevertheless, CIS-QDs still face challenges such as low particle stability and inefficient charge carrier recombination3. To address these challenges, organic molecules have been incorporated to enable the hybridization of CIS QDs4. In this context we use Formamidinium (FA) as a passivator during synthesis to improve the optical properties of CIS-QDs and further fine-tune their bandgap. The small crystal size of CIS QDs (2.5 nm) allows FA to bind effectively with them and remain stable even at high temperatures, up to 200°C during synthesis. Fourier-transform infrared spectroscopy (FTIR) revealed that FA remains within the crystal structure after synthesis. As a result, a redshift in the PL spectrum, an increase in PL intensity and a significant enhancement in PLQY are observed. These findings open new possibilities for developing efficient and non-toxic chalcogenide materials for light-emitting applications.

References:

[1] Liu, Z. et al. Rigid CuInS2/ZnS Core/Shell Quantum Dots for High Performance Infrared Light-Emitting Diodes. Nano Lett 24, 5342–5350 (2024).

[2] Wang, Z. et al. Facile Synthesis of Cu-In-S/ZnS Core/Shell Quantum Dots in 1-Dodecanethiol for Efficient Light-Emitting Diodes with an External Quantum Efficiency of 7.8%. Chemistry of Materials 30, 8939–8947 (2018).

[3] Liu, Z. et al. Short-Wave Infrared Light-Emitting Diodes Using Colloidal CuInS2 Quantum Dots with ZnI2 Dual-Passivation. ACS Nano 18, 21523–21533 (2024).

[4] Chen, B. et al. Synthesis and hybridization of CuInS2 nanocrystals for emerging applications. Chem Soc Rev 52, 8374–8409 (2023).

Acknowledgements:

The research work was supported by the European Research Council (ERC) through Consolidator Grant (818615-MIX2FIX). We acknowledge the financial support from Hellenic Foundation for Research and Innovation (HFRI) under the 5th Call for HFRI PhD Fellowships (Fellowship Number:19304.)

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