1. Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
2. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
3. Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States
4. National Renewable Energy Laboratory, Golden, Colorado 80401, United States
5. Swift Solar Inc., San Carlos, California 94070, United States
6. Molecular Engineering & Sciences Institute, University of Washington, Seattle, Washington 98195, United States