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. National Renewable Energy Laboratory, Golden, Colorado 80401, United States
4. Materials Science & Engineering Program, University of Colorado Boulder, Boulder, Colorado 80309, United States
5. Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
6. Swift Solar Inc., San Carlos, California 94070, United States