1. Department of Chemistry, University of California, Berkeley, CA 94720, USA.
2. Department of Physics, University of California, Berkeley, CA 94720, USA.
3. Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.
4. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
5. Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
6. Department of Materials Science and Engineering, University of California, Irvine, Irvine, CA 92697, USA.
7. Department of Physics and Astronomy, University of California, Irvine, Irvine, CA 92697, USA.
8. Irvine Materials Research Institute, University of California, Irvine, Irvine, CA 92697, USA.
9. Kavli Energy NanoScience Institute, Berkeley, CA 94720, USA.