1. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, Ohio 45221, United States
4. Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States
5. Department of Chemistry, University of California, Berkeley, California 94720, United States
6. Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117583
7. The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States