Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.192
Publication date: 20th April 2022
The long-term stability of perovskite solar cells is jeopardized by its sensitiveness to humidity even though technological encapsulation offers a first barrier to shield moisture-induced degradation. Different degradation pathways are activated depending on the perovskite composition for which ex situ characterization techniques provide a comparative view of the degradation before and after a certain ageing time.1 Herein, we exploit the latest advances in in situ X-ray diffraction, real-time electron imaging and liquid-cell transmission electron microscopy to reveal, in live, from early stage to the degradation propagation of triple cation Cs0.05(MA0.17FA0.83)0.95Pb(Br0.17I0.83)3 (CsMAFA) perovskite leading to phase segregation and decomposition.2-3 We reveal two competitive degradation paths leading on one hand to the decomposition of CsMAFA into PbI2 through a dissolution/recrystallization mechanism and on the other hand, to a non-equilibrium phase segregation leading to CsPb2Br5 and a cesium-poor/iodide-rich Cs0.05-x(MA0.17FA0.83)0.95Pb(Br0.17-2yI0.83+2y)3 perovskite. As a consequence of the dissolution/recrystallization mechanism under 85% R.H., such exposure leads to a film containing important heterogeneities in terms of morphology, photoluminescence (PL) intensities and lifetimes. The structural, morphological and chemical changes will be discussed in this communication based on operando liquid-cell TEM combined to SAED analysis and 4D-STEM-ASTAR investigations.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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