Publication date: 21st July 2025
Tin-based perovskite solar cells (Sn-PSCs) represent a promising alternative to their lead-based counterparts, offering reduced toxicity and appealing optoelectronic properties. However, their widespread application remains limited by poor operational stability, mainly driven by the oxidation of Sn2+ to Sn4+ under ambient conditions[1]. In this work, we explore the dynamic behavior of Sn-PSCs during operation, focusing on the interplay between degradation and self-healing processes. By incorporating thiophene-2-ethylammonium iodide (TEAI) as an additive in FASnI3 devices, we observe a spontaneous recovery of photovoltaic performance under continuous light and ambient exposure in unencapsulated conditions.
To gain deeper insight into the underlying mechanisms, we combine electrical and optical characterization techniques, including impedance spectroscopy and photoluminescence measurements. This talk will focus on the processes governing this unusual behavior and will discuss the possible chemical pathways involved in the observed self-healing effect, aiming to contribute to a better understanding of stability challenges in lead-free perovskite solar cells.
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