1Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305 USA
2Department of Mechanical Engineering, Stanford University, Stanford, CA 94305 USA
3Department of Electrical Engineering, Stanford University, Stanford, CA 94305 USA
4Department of Chemistry, University of California, Davis, CA 95616 USA
5Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
6Ikerbasque, Basque Foundation for Science, E-48011 Bilbao, Spain
7Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, Menlo Park, CA 94025 USA
8Precourt Institute for Energy, Stanford University, Stanford, CA 94305 USA
9Present Address: Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA 15261 USA
10Present Address: Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX 77005 USA
11Present Address: Dipartimento di Scienza dei Materiali, Universita di Milano-Bicocca, 20125 Milano, Italy
12Present Address: School of Chemical Engineering and Technology, Tianjin University, 300350 Tianjin, China
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