1. Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz, Altenberger Straße 69, Linz, 4040, Austria
2. Regional Centre for Advanced Technologies and Materials, Department of Physical Chemistry Faculty of Science, Palacký University Olomouc, Listopadu 1192/12, Olomouc, 771 46, Czech Republic