Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
DOI: https://doi.org/10.29363/nanoge.hopv.2024.252
Publication date: 6th February 2024
Tin-based (Sn) halide perovskites are emerging as promising photovoltaic materials due
to their favorable optoelectronic properties, high photoconversion efficiency, and
relatively low toxicity. However, these materials tend to crystallize rapidly, and oxidation
process from Sn²⁺ to Sn⁴⁺ under ambient conditions poses significant challenges.
To address these issues, two approaches are explored, (i) organic cation engineering in
Sn-based halide perovskite microcrystals, and (ii) the addition of reducing agents to three-
dimensional perovskite thin films.
The first approach involves synthesizing Sn-based halide perovskite microcrystals using
a hot-injection method, allowing control over dimensionality modulation by varying
reactant concentrations. These microcrystals exhibited a high photoluminescence
quantum yield (PLQY) of 75% for bromide-based perovskites in thin film.
The second approach, applied to three-dimensional thin films, improves stability by
incorporating reducing agents into the FASnI3 (formamidinium tin iodide) perovskite
solution. This strategy not only mitigates the oxidation reaction but also enhances the
surface morphology. An inverted perovskite solar cell fabricated using this improved
material showed a higher power conversion efficiency and greater stability under ambient
conditions compared to a solar cell prepared with pure FASnI3.
These findings suggest that both organic cation engineering and the addition of reducing
agents significantly enhance the stability and efficiency of Sn-based halide perovskites,
offering a promising path for developing more durable and efficient perovskite solar cells.
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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