Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.452
Publication date: 16th December 2024
Ternary chalcogenide nanocrystals have emerged as a promising material in the field of renewable energy, particularly as absorber materials for solar cells. In recent years, there has been a notable focus on the development of environmentally friendly materials, such as AgBiS₂ and AgSbS₂, as an alternative to traditional quantum dots containing heavy metals, including lead and cadmium. The components of these materials are plentiful and less toxic, reflecting the growing emphasis on sustainability and green energy solutions. These materials display high absorption coefficients, tunable band gaps, efficient charge separation, and impressive stability, rendering them ideal for emerging applications in solar cells, photodetectors, photocatalysis, and thermoelectrics. [1-3]
Nevertheless, the synthesis of quantum dots has traditionally been performed using the hot injection method, which involves prolonged high-temperature and vacuum processes. This approach presents significant challenges in terms of scalability, cost, and reproducibility, which must be overcome for these materials to be suitable for commercial applications. In this study, we present a straightforward and low-temperature synthesis of AgBiS₂ and AgSbS₂ quantum dots via cation exchange. This study presents a novel approach to the synthesis of Ag2S nanoparticles (NPs) that employs unconventional sulfur precursors and a sequential exchange of silver ions for bismuth and antimony ions. This method allows the preparation of high-quality ternary quantum dots with precise control of size and atomic ratio. Furthermore, the incorporation of the ternary nanocrystals into photovoltaic devices provides evidence of the viability of the novel synthetic approach for the fabrication of high-performance solar cells.
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