1. Department
of Materials and Centre for Plastic Electronics, Imperial College London, London SW7 2AZ, U.K.
2. Division
of Physical Sciences and Engineering, Solar and Photovoltaic Engineering
Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
3. Department
of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
4. Institut
für Angewandte Photophysik, TU Dresden, 01069 Dresden, Germany
5. Department
of Chemistry and Centre for Plastic Electronics, Imperial College London, London SW7 2AZ, U.K.
6. CSIRO Manufacturing Flagship, Clayton, VIC 3169, Australia
7. National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, United States