1. Physical Science and Engineering Division; Solar & Photovoltaics Engineering Research Center (SPERC); King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
2. School of Chemistry and Biochemistry; Center for Organic Photonics and Electronics (COPE); Georgia Institute of Technology; Atlanta GA 30332-0400 USA
3. Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia