Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.090
Publication date: 11th July 2022
Lead halide perovskite materials now play a pivotal role as an emerging class of semiconductors for photovoltaic applications, with a certified record efficiency of 25.7% in 2022. However, their commercialization has been hindered so far by the toxicity of lead and by their instability. Vacancy-ordered halide perovskites, with general formula A2B+4X6, are one of the alternative structures that have been designed to replace Pb2+ with non-toxic tetravalent cations. Ti, Zr, Pd, Sn, Te and Pt-based vacancy-ordered perovskites have already been synthesized but those containing tin and titanium have shown the best performances in solar cells. We used colloidal synthesis as a low-cost, scalable solution method for the preparation of cesium titanium halide and cesium tin halide nanocrystals [1]. Moreover, with this method we prepared mixed titanium-tin cesium iodide perovskites, with different amounts of tin and titanium and bandgaps suitable for solar cell applications. We investigated the structural and optical properties of these materials, their stability in air, and their feasibility for solar cells applications.
The authors acknowledge financial support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 725165) as well as from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. 713729. This project has received funding also from the Spanish State Research Agency, through the ‘‘Severo Ochoa’’ Center of Excellence CEX2019- 000910-S, the CERCA Programme/Generalitat de Catalunya and Fundacio´ Mir-Puig. We also acknowledge funding by the Fundacio´ Joan Ribas Araquistain (FJRA). This project was funded also by EQC2019-005797-P (AEI/FEDER UE).
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