1. King Abdullah University of Science and Technology (KAUST) KAUST Solar Centre (KSC) Physical Science and Engineering Division Thuwal 23955‐6900 Saudi Arabia
2. LPPI CY Cergy Paris Université Cergy 95000 France
3. Department of Materials Science and Engineering, and Organic and Carbon Electronic Laboratories (ORaCEL) North Carolina State University Raleigh NC 27695 USA