1. Department of Chemistry, University of Washington, Seattle, Washington 98189, United States
2. Department of Physics, University of Washington, Seattle, Washington 98185, United States
3. Department of Electrical and Computer Engineering, University of Washington, Seattle, Washington 98195, United States
4. Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
5. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
6. Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States