1. Department of Physics, William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology (HKUST), 000000 Kowloon, Hong Kong, P.R. China
2. King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), Material Science and Engineering Program (MSE), 23955-6900 Thuwal, Kingdom of Saudi Arabia
3. Department of Chemistry, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, Energy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology (HKUST), 000000 Kowloon, Hong Kong, P.R. China
4. Department of Electrical and Electronic Engineering, Hong Kong University of Science and Technology (HKUST), 000000 Kowloon, Hong Kong, P.R. China