Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.350
Publication date: 16th December 2024
Eco-friendly I-III-VI quantum dots (QDs) are emerging as promising materials for next-generation light-emitting and energy-harvesting devices due to their non-toxic nature, tunable band gap, environmental stability, and water solubility. [1]However, intrinsic defects such as cation and anion vacancies, interstitials, and antisites significantly control their optical properties. Here, we synthesize and study AgInS₂ QDs that exhibit two emissions: a relatively narrow but weak near the bandgap, and a more intense but broad and strongly red-shifted one. The former indicates free exciton emission and the latter defect related luminescence. Coating these QDs with gallium sulfide (GaSx) to produce AgInS2/GaSx core/shell structures leads to a significant suppression of the defect-related emission and great enhancement of the free-exciton luminescence. Using steady-state optical- and ultrafast transient absorption spectroscopy, we further investigate the absorption features of these core and core/shell QDs. Essentially, we find that the emissive defects in these QDs are primarily on the surface and diminishing them enables band-edge excitonic transitions. A comprehensive understanding of such surface defects is therefore crucial for yielding pure and efficient free-exciton emission in I-III-VI QDs.
We acknowledge financial support by the Bavarian State Ministry of Science and Arts and by the LMU Munich through the grant Solar Technologies go Hybrid (SolTech). We thank local research clusters and centers such as CeNS for providing communicative networking structures.
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