Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.064
Publication date: 18th December 2023
Mixed tin–lead perovskite materials encounter multiple degradation pathways, limiting their efficacy in tandem photovoltaic technologies. Overcoming these challenges necessitates addressing the thermal instability of the methylammonium cation within the perovskite composition and concurrently enhancing the oxidation resistance of the tin-based component. This study introduces a comprehensive approach to address these limitations, resulting in methylammonium-free tin–lead perovskite solar cells with heightened efficiency and stability. Our methodology involves a multi-component strategy, targeting each constraint. By incorporating cations capable of fine-tuning precursor solution properties, we achieve significantly improved film quality in methylammonium-free perovskites. Concurrently, the integration of reducing agents and surface engineering techniques substantially enhances the robustness and carrier dynamics of the perovskite films. As a testament to the success of our approach, the methylammonium-free perovskite solar cells exhibit an exceptional efficiency exceeding 22%, coupled with significantly enhanced device stability. Remarkably, these devices maintain negligible losses even after over 700 hours of continuous operation under 1 sun illumination. This work underscores the potential of comprehensive strategies in processing delicate materials like tin-containing perovskites, elevating their quality and positioning them for broader, successful applications.
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