Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Hybrid and Perovskite Photovoltaics I
CPP 2.2: Vortrag
Montag, 1. April 2019, 10:00–10:15, H18
The interplay of interfacial charges, contact layers and hysteresis in perovskite solar cells — Ilka M Hermes1, Yi Hou2, Christoph Brabec2, and •Stefan A.L. Weber1,3 — 1MPI for Polymer Research Mainz, Germany — 2Institute of Materials for Electronics and Energy Technology, Friedrich-Alexander University Erlangen-Nürnberg, Germany — 3Institute of Physics, Johannes Gutenberg University Mainz, Germany
The charge selective contact layers in perovskite solar cells affect device properties such as current density-voltage hysteresis. Using fullerene-based electron transport layers (ETLs), hysteresis could be suppressed by a reduction of the mobile ion concentration. However, the effect the ETL on the electronic properties of other constituent device layers remains unclear. Using Kelvin probe force microscopy, we compared potential distributions of methylammonium lead iodide-based solar cells with different ETLs, such as planar titania and a C60-derivative, with vastly different hysteretic behavior. We found the most significant potential differences at the interface to the organic hole transport layer spiroMeOTAD. Our results show that the choice of ETL not only influences the extraction and recombination at the perovskite/ETL interface but also changes the transport properties of the spiroMeOTAD layer. We propose that the higher density of mobile ions in the titania cell caused a reaction between iodide anions with the p-doped spiroMeOTAD to form a neutral interface layer, which increased the interfacial resistance and capacitance at the spiroMeOTAD interface.