Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
In this study, we systematically evaluated the effectiveness of various parylene derivatives (N, C, D, and F) as encapsulation materials for enhancing the stability of perovskite solar cells. Applied by chemical vapor deposition such materials can become a perspective alternative to traditional encapsulation with thermo plastics because of lower temperatures (30-40 ˚C) and compatibility with flexible substrates. Here we discuss the importance of parylene derivative selection and their different behavior in the present of humid air. In our previous work [1] it was shown that perovskite solar cells encapsulated with Parylene-N remain stable even after 10 000 hours spent in the dark ambient with moderate humidity levels (30-35%) with minimal efficiency loss (2%), representing one of the longest reported durations in PSC stability under such conditions. While chlorine-containing parylene derivatives (C and D) were found to be incompatible with silver electrodes initiating silver ion diffusion to the bulk of the perovskite material. Direct contact with water drop has revealed an interesting mechamism: parylene-F films due to lower density allowed rapid moisture penetration and irreversible degradation of perovskite photoactive phase with PbI2 formation. While denser and less permeable parylene-N and especially parylene-C films determine a controlled slow water penetration that results in a reversible process of perovskite monohydrate phase formation. In this way, the choice of parylene derivative, its density and morphology for encapsulation has a critical impact on perovskite solar cell stability.
This work was supported by the Russian Science Foundation (project no 26-72-10123).
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