1. Department of Chemistry, University of California, Berkeley, California 94720, United States
2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
5. Department of Chemistry, Columbia University, New York, New York 10027, United States
6. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
7. Kavli Energy NanoScience Institute, Berkeley, California 94720, United States