Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 78: Hybrid and Perovskite Photovoltaics II
CPP 78.3: Vortrag
Freitag, 16. März 2018, 10:00–10:15, C 264
Ingression of Moisture into Hybrid Perovskite Thin Films Probed with In-Situ GISANS — •Johannes Schlipf1, Lorenz Bießmann1, Lukas Oesinghaus2, Ezzeldin Metwalli1, Lionel Porcar3, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2TU München, Physik-Department and ZNN, LS Physics of Synthetic Biological Systems, 85748 Garching — 3Institut Laue-Langevin, 38042 Grenoble, France
Solution-processed hybrid perovskites are of great interest for photovoltaics. However, polycrystalline perovskite thin films show strong degradation in humid atmosphere which poses an important challenge for large-scale market introduction. With in-situ grazing incidence neutron scattering (GISANS) we analyze water content, degradation products and morphological changes during prolonged exposure to several humidity levels. At the highest humidity levels, formation of metastable hydrate phases is accompanied by domain swelling and transforms the facetted crystals to a pebble-like form. The films incorporate much more water than can be integrated in the hydrates. In low ambient humidity, around 10 vol% of water is adsorbed on the crystals without formation of crystalline degradation products. Thus, although production in ambient atmosphere is of interest for industrial production it might lead to long-term degradation without appropriate countermeasures.