Degradation observations of encapsulated planar CH3NH3PbI3 perovskite solar cells at high temperatures and humidity

Yu Han, Steffen Meyer, Yasmina Dkhissi, Karl Weber, Jennifer M. Pringle, Udo Bach, Leone Spiccia, Yi-Bing Cheng

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The stability of encapsulated planar-structured CH3NH3PbI3 (MAPbI3) perovskite solar cells (PSCs) was investigated under various simulated environmental conditions. The tests were performed under approximately one sun (100 mW cm2) illumination, varying temperature (up to 85 C cell temperature) and humidity (up to 80%). The application of advanced sealing techniques improved the device stability, but all devices showed significant degradation after prolonged aging at high temperature and humidity. The degradation mechanism was studied by post-mortem analysis of the disassembled cells using SEM and XRD. This revealed that the degradation was mainly due to the decomposition of MAPbI3, as a result of reaction with H2O, and the subsequent reaction of hydroiodic acid, formed during MAPbI3 decomposition, with the silver back contact electrode layer.
Original languageEnglish
Pages (from-to)8139 - 8147
Number of pages9
JournalJournal of Materials Chemistry A
Issue number15
Publication statusPublished - 2015

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