Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
In recent years, solar cells with perovskite absorbers have achieved an impressive gain in power conversion efficiency, which is now comparable to established absorber materials. Therefore, the major factors that affect the commercialization of perovskites have shifted to stability, upscaling and the prevention of lead leakage [1].
In this work, different encapsulation strategies for solar cells with Cs(MA,FA)Pb(I,Br)3 absorber were tested. All solar cells had a layer stack of ITO/NiOx/perovskite/PCBM/BCP/Ag and were sandwiched between two glass plates and encapsulated with a butyl rubber edge sealing. Additionally, different commercial thermoplastic polyolefins and Ca alginate as a possible lead retention material were included into the encapsulation. The Ca alginate was used in form of polyelectrolyte multilayers that were deposited onto the backside glass or a non-woven. The JV-characteristics of all samples were measured freshly prepared and after encapsulation. Despite temperatures of more than 120 °C during the encapsulation procedure, the efficiency was found to increase slightly.
After encapsulation, all samples were subjected to a damp heat test at 85 °C and 85 % r.H. JV-characteristics were measured after 100 h, 250 h and 500 h. As expected, all samples showed reduction of the efficiency. However, clear differences between the different sample types were observed. In particular, samples that were encapsulated with the non-woven showed less degradation and could retain a maximum efficiency of 6.1 % after 500 h of damp heat.
This work was supported by the Ministry of economy, labour and housing Baden-Württemberg under contract number 3-4332.62-ZSW/55 (SuPerB).
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