1. Department of Chemistry, University of Oxford, Oxford OX1 3TA, U.K.
2. KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
3. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
4. Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
5. Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, NorrköpingSE-60174, Sweden
6. Department of Material Science, Northwestern University, Evanston, Illinois 60208, United States
7. Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
8. X-ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
9. Department of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, U.K.