1. Device Technology and Chemical Physics Lab, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol 3041, Cyprus
2. Centre for Nano Science and Technology @PoliMi, Fondazione Istituto Italiano di Tecnologia, Via Pascoli 70/3, Milano 20133, Italy
3. Department of Physics, Experimental Condensed Matter Physics Laboratory, University of Cyprus, Nicosia 1678, Cyprus
4. Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz D-55128, Germany
5. KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
6. Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London SW7 2AZ, United Kingdom
7. Institute of Materials for Electronics and Energy Technology (I-MEET), Friedrich-Alexander-University Erlangen-Nuremberg, Martensstraße 7, Erlangen 91058, Germany
8. Bavarian Center for Applied Energy Research (ZAE Bayern), Haberstrasse 2a, Erlangen 91058, Germany
9. Department of Physics, University of Ioannina, Ioannina 451 10, Greece