1. Engineering Research Center of Micro-nano Optoelectronic Materials and Devices, Ministry of Education, Fujian Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, and Department of Physics, Xiamen University, Xiamen 361005, China
2. Department of New Energy Science and Engineering, Xiamen University Malaysia, Sepang 43900, Malaysia
3. Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China