1. Biological and Environmental Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
2. Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
3. Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, Illinois 60611, United States
4. Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London SW7 2AZ, U.K.
5. Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, U.K.
6. Physical Sciences and Engineering Division, KAUST Solar Center, KAUST, Thuwal 23955-6900, Kingdom of Saudi Arabia