1. Applied Science and Technology Graduate Group, University of California at Berkeley, Berkeley, CA, 94720 USA
2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA
3. Materials Science Center, National Renewable Energy Laboratory, Golden, Colorado, 80401 USA
4. Clean Energy Institute, University of Washington, WA, 98105 USA
5. Molecular Foundry Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA
6. Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, CA, 94720 USA