1. Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
4. Department of Chemistry and Materials Science and Engineering, University of California, Berkeley, California 94720, United States
5. SSRL Materials Science Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Rd MS 69, Menlo Park, California 94025, United States
6. Kavli Energy NanoScience Institute, Berkeley, California 94720, United States