Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 15: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research
MM 15.8: Vortrag
Dienstag, 2. April 2019, 13:00–13:15, H44
Post-treatment processes and their effects on organic solar cell morphology and performance — •Christina Harreiß1, Stefan Langner2, Stefanie Rechberger1, Johannes Will1, Christoph J. Brabec2, and Erdmann Spiecker1 — 1Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy, Friedrich-Alexander Universität Erlangen-Nürnberg — 2Institute of Materials for Electronics and Energy Technology, Friedrich-Alexander Universität Erlangen-Nürnberg
During the past decades the efficiency of solution-processed organic solar cells (OSCs) could be improved by developing new processing conditions. Since the morphology of OSCs determines the charge separation at the interfaces and the electron and hole transport to the electrodes, it influences the device performance. Analytical Transmission Electron Microscopy (TEM) techniques like energy filtered TEM (EFTEM) are used to study the morpholgy since conventional imaging techniques are mostly insufficient to visualize the donor and acceptor. Here we present results on a OSC system composed of a small molecule (DRCN5T) and a fullerene derivative (PC70BM). The active layers were treated by thermal annealing (TA) and solvent vapor annealing (SVA). The SVA was performed with different solvents and for different annealing times. The morphology was revealed for all post-treated active layers by EFTEM and correlated to the performance. Currently we are performing the TA directly in our TEM device by an in situ heating technique. By this, we can observe the phase separation and formation of an interpenetrating network of donor/acceptor phases.