Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.318
Publication date: 16th December 2024
The long-term stability of perovskite solar cells (PSCs) depends not only on the inherent stability of their device layers but also on the effectiveness of their encapsulation. In commercial photovoltaic (PV) technologies, thermal lamination with over-device sealants, such as ethylene vinyl acetate (EVA) or similar polymeric films, is commonly employed. However, PSCs require an additional edge-sealing layer to significantly reduce water vapor permeation rates, ensuring enhanced protection for the device[1].
Glass frit sealants, known for their superior hermeticity and mechanical durability[2], have emerged as a highly effective encapsulation solution for PSCs. When applied through laser-assisted edge-sealing techniques, these materials have successfully protected PSCs under different standard durability tests as outlined by IEC61646 protocols [3, 4].
This discussion focuses on the influence of encapsulation hermeticity on the long-term stability of PSCs. Specifically, we examine the impact of the atmospheric composition within the cavity of glass frit-sealed devices. Our study investigates the light-induced degradation of perovskite films sealed under different atmospheres, including air, nitrogen, argon, and carbon dioxide. Results indicate that encapsulated printable HTM-free PSCs demonstrate significantly improved lifetimes when sealed under nitrogen and carbon dioxide atmospheres compared to air.
These findings highlight the role of controlled internal atmospheres in mitigating degradation and ensuring the durability of PSC devices.
Marta Pereira is grateful to the Portuguese Foundation for Science and Technology (FCT) for her PhD grant (reference: 2021.06451.BD). LA/P/0045/2020 (ALiCE), UIDB/00511/2020 and UIDP/00511/2020 (LEPABE), funded by national funds through FCT/MCTES (PIDDAC). 2022.05826.PTDC, funded by FEDER funds through COMPETE2020 – Programa Operacional Competitividade e Internacionalização (POCI) and by national funds (PIDDAC) through FCT/MCTES. This work has received funding from the European Union’s Horizon 2020 programme through a FET Proactive research and innovation action under grant agreement No. 101084124. This work is financed by national funds through FCT – Fundação para a Ciência e a Tecnologia, I.P., within the scope of project “TanPT - 2022. 05826.PTDC”.
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