1. Solar and Photovoltaics Engineering Research
Center, King Abdullah University of Science and Technology, Thuwal 23599-6900, Kingdom of Saudi Arabia
2. School of Chemistry and Biochemistry & Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
3. Department of Chemistry & Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506-0055, United States