Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.675
Publication date: 16th December 2024
While most research on I-III-VI nanomaterials has focused on stoichiometric compositions with equimolar amounts of Group I (Cu, Ag) and Group III (In, Ga) metals, we have taken a different approach by developing Indium-rich I-III-VI colloids (>50 at.% Indium in the cationic sublattice). [1],[2] These materials, though non-stoichiometric, remain perfectly charge-balanced semiconductors due to the presence of cationic vacancies and long-range atomic ordering. Notably, Indium-rich I-III-VI compositions are go-to materials for thin-film photovoltaics, as they exhibit fewer defects in CIGS grains and at interfaces.
In this talk, we will explore the potential of Indium-rich I-III-VI quantum dots. In addition to their size-dependent properties, these non-stoichiometric colloids offer broad solubility ranges (i.e., tunable Group I to Group III ratios), enabling precise control over the optical bandgap and photoluminescence wavelength. [3] We will examine how atomic ordering influences these properties in a non-linear fashion, leading to particularly efficient photoluminescence at select compositions. [2],[4] We will also discuss a generalizable synthetic method for Indium-rich I-III-VI nanocrystals, [3] capable of batch-upscaling to >10 grams of size- and composition-uniform quantum dots in the laboratory settings. [5]
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