Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.218
Publication date: 28th August 2024
Semiconductor nanocrystals have promise in many optoelectronic and electronic technologies due to their tunable electronic structure and facile colloidal processing. However, one major factor limiting their widespread adoption is inherent heterogeneity within an ensemble. For this reason, magic sized clusters, with atomically precise structures and negligible heterogeneous broadening, have drawn significant attention as a potential system with ensemble level homogeneity. However, many of the most common nanocrystal materials, such as Cd-chalcogenides and In-pnictides, form clusters with bandgaps far to the blue, limiting potential applications. We illustrate the colloidal synthesis of nontoxic, earth abundant, iron sulfide clusters with narrow and invariant absorption features and a ~700 nm band-gap which allows for absorption across the visible spectrum. These ~2nm diameter particles exhibit quantum confinement, with a blue shift from the expected 0.95 eV bandgap. Furthermore, through controlled surface coordination via ligand exchange, we can promote band-edge photoluminescence. These results suggest surface defects play a major role in determining the nonradiative processes present in the system. Further growth in polymerizing media (e.g. oleyl amine) facilitates the formation of long-range order into quasi-1D fibrils. The formation of these fibrils coincides with a red-shift to the absorption spectrum while maintaining the apparent morphology of the individual nanocrystals. These iron sulfide clusters show promise as a platform for future device engineering due to the unique combination of optical properties and material availability and safety.
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