Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 73: Organic Electronics and Photovoltaics II
CPP 73.6: Talk
Wednesday, March 18, 2020, 17:45–18:00, ZEU 260
Effect of Solvent Additives on the Morphology and Device Performance of Printed Non-fullerene Acceptor Based Organic Solar Cells — •Kerstin S. Wienhold1, Volker Körstgens1, Sebastian Grott1, Xinyu Jiang1, Matthias Schwartzkopf2, Stephan V. Roth2,3, and Peter Müller-Buschbaum1,4 — 11TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 22DESY, 22607 Hamburg — 33KTH, Department of Fibre and Polymer Technology, SE-100 44 Stockholm, Sweden — 44Heinz Maier-Leibnitz-Zentrum, Lichtenbergstr. 1, 85748 Garching, Germany
Printing of active layers of high efficiency organic solar cells with a meniscus-guided slot-die coater enables up-scaling of the solar cell production. However, an optimization of this thin film deposition is necessary as insights gained from spin-coating cannot simply be transferred to printed photovoltaics. In this work, active layers of the conjugated polymer PBDB-T-SF and the non fullerene small molecule acceptor IT 4F are slot die coated with different concentrations of 1,8 diiodoctane (DIO) and the effect on the inner nano structure and surface morphology of the material is studied with grazing incidence small angle X-ray scattering (GISAXS), grazing incidence wide angle X ray scattering (GIWAXS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The optical properties are studied with photoluminescence (PL), UV/Vis absorption spectroscopy and external quantum efficiency (EQE) measurements and correlated to the corresponding power conversion efficiencies.