SKM 2023 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Hybrid and Perovskite Photovoltaics III
CPP 51.3: Talk
Thursday, March 30, 2023, 15:30–15:45, GÖR 226
Investigation of defects inside of mixed halide perovsike solar cells — •Pascal Rohrbeck1, Yenal Yalcinkaya1,2, and Stefan A. L. Weber1,2 — 1Max Planck Institute for polymer research, department physics at interfaces, Ackermannweg 10, 55128 Mainz, Germany — 2Johannes Gutenberg University, Department of Physics, Staudingerweg 10, 55128 Mainz, Germany
Understanding the electron and ion dynamics is an important task for improving the lead halide perovskites and related devices. For this task, macroscopic measurement techniques are not sufficient. Therefore, nanoscale characterization methods can play an important role in studying perovskite solar cells. In this study, we investigate the spatial defect distribution in the vicinity of grain boundaries. We introduce local photovoltage, photovoltage decay, and defect mapping via time-resolved Kelvin probe force microscopy (tr-KPFM) methods. We are able to detect and localize areas of increased charge carrier recombination, ion migration, and defects. This will help to understand recombination losses and improve perovskite solar cells on the long run.