Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.214
Publication date: 16th December 2024
Tin-based perovskites (Sn-PVK) have emerged as one of the most promising lead-free alternatives for the development of efficient and environmentally friendly photovoltaic technologies. Despite their potential, the performance of Sn-PVK solar cells is severely limited by a high density of bulk and surface defects. These defects are primarily attributed to the rapid crystallization of the perovskite and the tendency of Sn²⁺ to oxidize into Sn⁴⁺, which creates lattice vacancies and significantly degrades device performance. The introduction of thiophene-2-ethylammonium halides (TEAX, where X = I, Br, and Cl) has been demonstrated as a strategy to improve the crystallization of FASnI₃, a common tin-based perovskite. When used in solar cells, these films present an improved operational stability maintaining >95% of the initial power conversion efficiency (PCE) after >2000 h in N2 in continuous operation under 1 sun illumination. However, the evolution of the FASnI3-TEAI solar cell parameters changes when carried out under ambient conditions.
In this work we present ongoing research to explore the mechanisms underlying the decay and subsequent recovery of the performance of FASnI₃-TEAI solar cells under ambient conditions. By analyzing the influence of environmental factors such as humidity, applied voltage, and illumination on device behavior, we aim to provide a better understanding of this unique phenomenon.
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