1. Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
2. Materials Science and Engineering Department, University of Washington, Seattle, Washington 98195, United States
3. pi-Conjugated Polymers Unit, Okinawa Institute of Science and Technology Graduate University, Onna-son 904-0495, Okinawa, Japan
4. Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, United States
5. Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506-0055, United States
6. Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States
7. Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
8. Renewable and Sustainable Energy Institute (RASEI), University of Colorado Boulder, Boulder, Colorado 80309, United States
9. Department of Materials Science and Engineering, Monash University, Clayton 3800, VIC, Australia
10. National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States