We examined different encapsulation strategies for perovskite solar cells by testing the device stability under continuous illumination, elevated temperature (85 °C) and ambient humidity of 65 %. The effects of the use of different epoxies, protective layers and the presence of desiccant were investigated. The best stability (retention of ∼80 % of initial efficiency on average after 48 h) was obtained for devices protected by a SiO 2 film and encapsulated with a UV‐curable epoxy including a desiccant sheet. However, the stability of ZnO‐based cells encapsulated by the same method was found to be inferior to that of TiO 2 ‐based cells. Finally, outdoor performance tests were performed for TiO 2 ‐based cells (30–90 % ambient humidity). All the stability tests were performed following the established international summit on organic photovoltaic stability (ISOS) protocols for organic solar cell testing (ISOS‐L2 and ISOS‐O1).
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Dong et al. (2016) studied this question.