Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.029
Publication date: 16th December 2024
Colloidal metal halide perovskite nanocrystals have emerged as promising candidates for next-generation optoelectronic applications, including solar cells, light-emitting diodes (LEDs), and photodetectors. Their tunable optical and electronic properties, combined with facile solution-based synthesis, have brought lead and tin halide perovskites to the forefront of material research. However, due to environmental and health concerns associated with lead, tin-based perovskites have gained increasing attention, despite challenges posed by the instability of tin in its 2+ oxidation state.
In this work, we report recent advancements in the synthesis of tin halide perovskite nanocrystals, including CsSnI₃, CsSnBr₃, and FASnI₃, through precise control of precursor ratios and ligand chemistry. These developments enable the formation of highly stable, monodisperse nanocrystals with tunable optoelectronic properties. Notably, we observed the simultaneous formation of 2D Ruddlesden-Popper (RP) phases and 3D perovskite structures under similar synthetic conditions. Our studies highlight how the molecular ink plays a pivotal role in directing the growth and stability of these nanostructures.
We further demonstrate that by understanding the reaction mechanism, the precursor intermediate states, the selective formation of either 2D or 3D perovskite nanocrystals can be achieved, depending on the desired application. This control opens pathways for the development of tailored perovskite inks for optoelectronic devices, bridging the gap between fundamental colloidal chemistry and practical device implementation. Our findings provide critical insights into the growth mechanisms of tin halide perovskite nanocrystals, creating novel possibilities for their integration into future high-performance optoelectronic technologies.
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