EVALUATION of INNOVATIVE BARRIER FOILS for FLEXIBLE PSC under DAMP HEAT
Nicola De Giuseppe a, Rosamaria Marrazzo a, Stefano Zanardi a, Ilker Dogan b, Dorrit Roosen-Melsen b, Duygu Akin Kara c, Paheli Ghosh c, Patrick Schlenz d, Riikka Suhonen e
a Eni S.p.A – Renewable, New Energies and Material Science Research Center – DE-R&D- Via Fauser, 4 - 28100 Novara, Italy
b TNO High Tech Campus , 5656 AE Eindhoven, Netherlands
c HZB Helmholtz Zentrum Berlin, Albert-Einstein-Straße 12, 12489 Berlin, Germany
d Fraunhofer FEP, Winterbergstraße 28 01277 Dresden, Germany
e VTT Technical Research Centre of Finland Ltd., Kaitoväylä 1, 90590 Oulu, Finland
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV25)
Roma, Italy, 2025 May 12th - 14th
Organizers: Filippo De Angelis, Francesca Brunetti and Claudia Barolo
Poster, Rosamaria Marrazzo, 255
Publication date: 17th February 2025

The effect of different barrier foils on the stability of methylammonium-formamidinium-cesium PSC was studied in damp heat induced aging over 2000 hours, at ISOS-D-3 aging test conditions. The devices were purposedly encapsulated between the flexible barrier foils, on top of the PSC silver contacts, and a glass slide. Electrical and spectroscopic characterization were performed at time intervals. The absorption spectra of only one group of PSC show a rapid decrease of the absorbance at 550 nm, due to perovskite chemical degradation to byproducts. All the PSC of the other groups show negligible changes in their absorption spectra, mainly after 1600h, showing little to none perovskite degradation, with no band gap variation, and still retain high PCE after 2000 h. The results were correlated with the films’ water vapour transmission rates: a fast chemical degradation occurs for the perovskite exposed to damp heat with the only protection of a barrier film having a 0.013 g/m2 24h WVTR value, which leads to cell degradation resulting from moisture exposure. The perovskite active layer remains largely intact when the WVTR is ≤0.002 g/m2 24h. This suggests that the observed PCE decrease is mainly associated with the metal-perovskite-encapsulant contact interface. Moreover, the strong correlation between PCE and Jsc mplies that the overall degradation is chiefly driven by a loss in charge carrier transport efficiency within the device. 

The project has received funding from the European Union’s Horizon 2020 research and innovation programme. Funding reference: 101122283

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