1. National Renewable Energy Laboratory, Golden, Colorado 80401, United States
2. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
3. Department of Applied Physics, Stanford University, Stanford, California 94305, United States
4. Department of Physics, Stanford University, Stanford, California 94305, United States
5. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator, Laboratory, Menlo Park, California 94025, United States
6. Sandia National Laboratories, PO Box 5800, Albuquerque, New Mexico 87185, United States