1. Department of Chemistry and Centre for Processable Electronics, Imperial College London, London, W12 0BZ, UK
2. Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications (KINPA), Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
3. Department of Materials Science and Engineering, Monash University, Wellington Road, Clayton, Victoria, 3800, Australia
4. King Abdullah University of Science and Technology (KAUST), KAUST Solar Centre (KSC), Physical Sciences and Engineering Division (PSE), Thuwal, 23955–6900, Saudi Arabia