1. Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
2. Department of Physics and Centre for Plastic Electronics, Imperial College London, London SW7 2AZ, United Kingdom
3. Department of Chemistry, Stanford University, Stanford, California 94305, United States
4. Department of Bioelectronics, École Nationale Supérieure des Mines, CMP-EMSE, MOC Gardanne 13541, France
5. Physical Sciences and Engineering Division, KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), KSC Thuwal 23955-6900, Saudi Arabia
6. Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
7. Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
8. Renewable and Sustainable Energy Institute, University of Colorado at Boulder, Boulder, Colorado 80309, United States
9. Chemistry and Nanoscience Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
10. Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, Colorado 80309, United States
11. Electrical Engineering Division, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, United Kingdom
12. Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, Illinois 60611, United States