1. Department of Chemistry, Life Science and Environmental Sustainability, Parma University, Parco Area delle Scienze 17/A, 43124 Parma, Italy
2. Kekulé-Institute for Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Str. 1, D-53121 Bonn, Germany
3. Division of Theoretical Physics, Ruđer Bošković Institute, Bijenićka cesta 54, 10000 Zagreb, Croatia
4. Center for Surface- and Nano-Analytics (ZONA), Institute for Physical Chemistry (IPC) and Linz Institute for Organic Solar Cells (LIOS), Johannes Kepler University, Altenberger Str. 69, A-4040 Linz, Austria