1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Hubei 430074, China
2. Chemical and Material Sciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
3. Department of Physics, Colorado School of Mines, Golden, Colorado 80401, United States
4. Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States
5. Center for Advanced Solar Photophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States