1. Organic Bioelectronics Laboratory, Biological and Environmental Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
2. KAUST Solar Center (KSC), Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
3. Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
4. Department of Electrical Engineering, Columbia University, New York, New York 10027, United States
5. Simpson Querrey Institute, Northwestern University, Chicago, Illinois 60611, United States
6. Department of Chemistry, University of Oxford, Oxford OX1 3TA, United Kingdom