Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Perovskite and Photovoltaics 3
CPP 28.4: Vortrag
Mittwoch, 7. September 2022, 15:45–16:00, H38
Degradation mechanisms of perovskite solar cells under vacuum and one atmosphere of nitrogen — •Renjun Guo1, Wei Chen1, Lennart K. Reb1, Manuel A. Scheel1, Matthias Schwartzkopf2, Stephan V. Roth2, and Peter Müller-Buschbaum1 — 1Technische Universität München, Garching, Germany — 2Deutsches Elektronen-Synchrotron, Hamburg, Germany
Extensive studies have focused on improving the operational stability of perovskite solar cells. Only a few studies survey the fundamental degradation mechanisms related to the device performance, and these studies were executed under various experimental conditions. Thus, we investigate the degradation mechanisms of high-efficiency perovskite solar cells under vacuum and a nitrogen atmosphere, as based on the International Summit on Organic Photovoltaic Stability protocols. We use synchrotron radiation-based operando grazing-incidence X-ray scattering methods. Unlike what was seen in previous reports, we find that the perovskite lattice can also experience a lattice shrinkage under operation. Moreover, we reveal that the atmosphere has a paramount influence on phase segregation, lattice distortion, and morphology deformation during operation of mixed cation lead mixed halide perovskite solar cells. This, in turn, degrades the performance of the respective perovskite solar cells. Our discoveries emphasize the importance of different types of inert atmospheres as critical parameters, which must be considered in future scientific studies and the industrial screening of longevity for photovoltaic modules.