1. Ira A. Fulton Schools of Engineering, Arizona State University, Tempe, Arizona 85287, United States
2. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
3. Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
4. National Renewable Energy Laboratory, Golden, Colorado 80401, United States
5. First Solar, Perrysburg, Ohio 43551, United States
6. Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
7. Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States