Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
DOI: https://doi.org/10.29363/nanoge.iperop.2024.042
Publication date: 18th October 2023
Tin-based (Sn) halide perovskites have become one of the most prospective photovoltaic materials due to their optoelectronic properties, high photoconversion efficiency and relatively low toxicity.[1][2] Nevertheless, the rapid crystallization of tin-based perovskite and the easy oxidation of Sn2+ to Sn4+ under ambient conditions increases the interest of the scientific community.[3] To avoid these undesirable processes, we will address by two different methods, for instance, (i) organic cations engineering in Sn-based halide perovskite microcrystals, and (ii) adding reducing agents in three dimensional perovskite thin film.
On the one hand, Sn-based halide perovskite microcrystals have been synthetized by hot-injection method to control the dimensionality by changes the concentration of reactants. The physical properties suggest high photoluminescence quantum yield (PLQY) of 75% and 25% for chloride-based and bromide-based, respectively, and almost negligible for 2D Sn-based microcrystals. Increasing the dimensionality, we suggest adding a variety of additives that act as reducing agents with different nature in thin film. The addition of these novel materials into the FASnI3 (FA is formamidinium) perovskite solution controlled the oxidation reaction and improved the surface morphology. An inverted perovskite solar cell was prepared and characterized. Due to the Sn4+ concentration is reduced in the Sn-based perovskite layer, the power conversion efficiency in a solar cell and the cell stability under ambient conditions are improved notably in comparison with the pure FASnI3.
This project has received funding from the European Unions Horizon 2020 research and innovation program under grant agreement No 862656 (project DROP-IT) by the Spanish MICINN through project no. PID2020-120484RB. Also, the authors acknowledge the financial support by Generalitat Valenciana under grant CIAPOS 2022 (CIAPOS/2022/018). Santiago Grisola program supported by Generalitat Valenciana under the project GRISOLIAP/2021/112. CIDEGENT Program of the Generalitat Valenciana of Spain under the project CIDEGENT/2021/044 (project 2DPb-FREE).
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