1. Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States
2. Chemistry & Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
3. School of Materials Science and Engineering, Nankai University, Tianjin 300350, People’s Republic of China
4. Department of Chemistry, Yousef Haj-Ahmad Department of Engineering, Brock University, 1812 Sir Isaac Way, St Catharines, Ontario L2S 3A1, Canada
5. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
6. Institute of Atomic and Molecular Physics, Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, People’s Republic of China
7. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
8. Department of Electrical and Computer Engineering, Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487, United States
9. Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States