1. Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, United Kingdom
2. Institute for Physical Chemistry and Centre for Advanced Materials, Universität Heidelberg, 69120 Heidelberg, Germany
3. Kurt-Schwabe-Institut für Mess- und Sensortechnik Meinsberg e.V., Kurt-Schwabe-Str. 4, 04736 Waldheim, Germany
4. Heliatek GmbH, Treidlerstraße 3, 01139 Dresden, Germany
5. Centre for Nanobiophotonics, Department of Chemistry, Greinstr. 4-6, 50939 Köln, Germany