1. King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC) and Physical Science and Engineering
Division, Thuwal 23955-6900, Saudi Arabia
2. Department
of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
3. King Abdullah University of Science and Technology (KAUST), Imaging and Characterization Core Laboratory, Thuwal 23955-6900, Saudi Arabia
4. School
of Chemistry and Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, Georgia 30332-0400, United States