1. Department of Electrical and Computer Engineering, Princeton University, Princeton, New Jersey 08544, USA
2. Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, USA
3. Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
4. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, D-12489 Berlin, Germany
5. Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721-0041, USA
6. Berlin Joint EPR Lab, Fachbereich Physik, Freie Universität Berlin, D-14195 Berlin, Germany
7. School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA
8. Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, Colorado 80303, USA
9. National Renewable Energy Laboratory, Chemistry and Nanoscience Center, Golden, Colorado 80401, USA
10. Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80303, USA
11. Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80303, USA