1. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Goteborg 41296, Sweden
2. Materials Science Institute of Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
3. Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
4. Universidade da Coruña, Campus Industrial de Ferrol, CITENI, Esteiro, 15403 Ferrol, Spain
5. Laboratory of Organic Electronics, Linköping University, 60174 Norrköping, Sweden
6. POLYMAT, Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain