Félix, R.; Rehermann, C.; Liu, D.; Handick, E.; Hartmann, C.; Wilks, R.G.; Unger, E.; Bär, M.: Photoinduced phase segregation and degradation of perovskites revealed by x-ray photoelectron spectroscopy. In: Proceedings 46th IEEE Photovoltaic Specialists ConferenceIEEE, 2019. - ISBN 978-1-7281-0494-2, p. 2362-2367
10.1109/PVSC40753.2019.8980746
Open Access Version
Abstract:
Pb-based Pperovskite absorbers based withon organic (i.e., CH3NH3+) and inorganic (i.e., Cs+) cations with and a halide composition of 75% Br and 25% I are investigated with x-ray photoelectron spectroscopy while submitted to environmental stress factors to study their stability. Changes in chemical properties of the absorbers were monitored in ultra-high vacuum and under simulated solar, as well as, x-ray irradiation. Although changes are detected for both types of perovskite absorbers, the organic cation perovskite exhibits a more pronounced tendency to photodegrade.