1. Solar and
Photovoltaics Engineering Research Center, Division of Physical Science
and Engineering, 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