1. SDU Centre for Photonics Engineering, University of Southern Denmark, Alsion 2, DK-6400 Sønderborg, Denmark
2. Department of Natural and Applied Sciences, Evangel University, Springfield, Missouri 65802, United States
3. Institute of Physical Chemistry and Linz Institute for Organic Solar Cells (LIOS) & Center for Nano-Analytics (ZONA), Johannes Kepler University, Altenberger Str. 69, A-4040 Linz, Austria