1. Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics and Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences , Urumqi , China ;
2. Center of Materials Science and Opto-electronic Technology, University of Chinese Academy of Sciences , Beijing , China ;
3. School of Physics and Electrical Engineering, Qinghai Normal University , Xining , Qinghai , China ;
4. Yew Wah International Educational School of Guangzhou , Guangzhou , China ;
5. Renewable Energy Research Group, Department of Building Services Engineering, The Hong Kong Polytechnic University , Hong Kong , Kowloon , China