1. King Abdullah University of Science and Technology (KAUST) Kaust Solar Center (KSC) Thuwal 23955‐6900 Saudi Arabia
2. Department of Chemistry and Centre for Plastic Electronics Imperial College London Exhibition Road London SW7 2AZ UK
3. Optoelectronics Group Cavendish Laboratory University of Cambridge JJ Thomson Avenue Cambridge CB3 0HE UK
4. BASF Schweiz AG RAV/BE Mattenstrasse Basel 4058 Switzerland
5. Department of Materials Science and Engineering Monash University Victoria 3800 Australia