Publication date: 15th December 2025
Colloidal quantum dots (CQDs) are highly valued for their wavelength-tunability and transition selectivity. The origin of wavelength tunability is affected mainly by the quantum-confinement effect, which increases the bandgap energy. Also, the transition selectivity, the feature of an artificial atom, is related to the angular momentum of the states. As demand for environmentally friendly materials for sustainable technologies has steadily increased, it is necessary to explore new CQD materials. Here, I will present infrared silver chalcogenide (AgₓE, x > 2, E=S, Se, Te) CQDs with adjustable optical properties and lower toxicity. These silver chalcogenide CQDs can exhibit both intraband transition and interband transitions by varying stoichiometry, surface ligands, and conduction energy levels. We also found that precise control of composition, surface passivation strategies, and additional shell growth significantly enhances the eSWIR-MWIR photoluminescence quantum yield, increases structural stability, and improves photodetector performance, including responsivity and detectivity. Additionally, I will discuss the Ag2Se and Ag2Te CQDs synthesized at room temperature, which can reduce manufacturing costs.
This research was supported by the Basic Science Research Program (NR059609, NR068167) and the Institute for Basic Science
(IBS-R023-D1).
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