1. Department of Chemistry, University of California, Berkeley, California 94720, United States
2. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, P. R. China
5. The Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
6. Department of Chemistry and Chemical Biology, University of California, Santa Cruz, Santa Cruz, California 95064, United States
7. Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States