1. Department of Physics and Centre for Plastic Electronics; Imperial College London; South Kensington Campus; London SW7 2AZ UK
2. Institut de Ciència de Materials de Barcelona (ICMAB-CSIC); Campus de la UAB; Bellaterra 08193 Catalunya Spain
3. ENEA - Italian National Agency for New Technologies; Energy and Sustainable Economic Development; Research Centre Portici - P.le E; Fermi 1 80055 Portici (NA) Italy
4. Department of Chemistry and Centre for Plastic Electronics; Imperial College London; South Kensington Campus; London SW7 2AZ UK
5. IEK5-Photovoltaik; Forschungszentrum Jülich; 52425 Jülich Germany
6. Faculty of Engineering and CENIDE; University of Duisburg-Essen; Carl-Benz-Str. 199 47057 Duisburg Germany
7. ICREA; Passeig Lluís Companys 23 Barcelona 08010 Spain
8. Centre for Plastic Electronics and Department of Materials; Royal School of Mines, Imperial College London; London SW7 2AZ UK