1. National Renewable Energy Laboratory, Golden, Colorado 80401, United States
2. Department of Electrical, Computer and Energy Engineering, University of Colorado Boulder, Boulder, Colorado 80302, United States
3. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
4. Corning Research & Development Corporation, Corning, New York 14830, United States
5. Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, Colorado 80309 United States