1. Department of Physics and Astronomy, University of California, Irvine, Irvine, CA 92697, USA.
2. Department of Mining and Materials Engineering, McGill University, Montreal H3A 0C5, Canada.
3. Institute for New Energy Materials and Low-Carbon Technologies and Tianjin Key Laboratory of Photoelectric Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
4. Department of Chemistry and Biochemistry, Queens College–CUNY, Flushing, Queens, NY 11367, USA.
5. Department of Physics, Tamkang University, New Taipei City 25137, Taiwan.
6. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.
7. MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials, and Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resource, Environments and Materials, Guangxi University, Nanning 530004, China.
8. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.