1. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
3. Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Department
of Materials Science and Engineering, University of California—Berkeley, Berkeley, California 94720, United States
5. Kavli Energy NanoScience Institute, Berkeley, California 94720, United States