1. Center for Polymers and Organic Solids University of California Santa Barbara (UCSB) Santa Barbara CA 93106 USA
2. Optoelectronics Group Cavendish Laboratory University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK
3. Department of Chemical Engineering University of California Santa Barbara (UCSB) Santa Barbara CA 93106 USA
4. Department of Chemical Engineering and Applied Chemistry Chungnam National University Daejeon 34134 Republic of Korea
5. Department of Physics and Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA
6. Institute of Physics SAS Centre for Advanced Material Application SAS Dubravsk a cesta 9 Bratislava 845 11 Slovak Republic
7. Tomas Bata University in Zlin Nad Stráněmi 4511 Zlín CZ 760 05 Czech Republic