Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: Poster: Hybrid and Perovskite Photovoltaics
CPP 11.8: Poster
Montag, 7. März 2016, 18:15–21:00, Poster B2
Observation of ionic- and trapped charges at interfaces in an operating perovskite solar cell — Victor Bergmann1, Yunlong Guo2, Hideyuki Tanaka2, •Ilka Hermes1, Dan Li1, Alexander Klasen1, Simon Bretschneider1, Eiichi Nakamura2, Rüdiger Berger2, and Stefan Weber1,3 — 1MPI for Polymer Research, Mainz — 2University of Tokyo, Japan — 3Johannes Gutenberg University Mainz, Germany
Optimization of solar cell devices requires efficient charge extraction. With cross section Kelvin probe force microscopy (KPFM), we were able to locally study the potential distribution inside a mesoporous device under working conditions (DOI:10.1038/ncomms6001). Here, we used frequency modulation KPFM to investigate cross sections of planar perovskite solar cells. In particular, we performed experiments in dark and under illumination on an operating planar CH3NH3PbI3 device, in short circuit and open circuit conditions, respectively. Thereby, we found an experimental proof that both ion migration and trapped interfacial charges can be present in a perovskite device and demonstrate that cross sectional FM-KPFM is able to distinguish between the two effects.