1. School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology; Atlanta Georgia 30332-0400
2. Department of Chemistry and Center for Applied Energy Research; University of Kentucky; Lexington Kentucky 40506-0055
3. Department of Materials Science and Engineering; Stanford University; Palo Alto California 94305-4034
4. Solar and Photovoltaics Engineering Research Center; King Abdullah University of Science and Technology; Thuwal 23955-6900 Kingdom of Saudi Arabia