1. Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology (HUST) Wuhan Hubei 430074 P.R. China
2. China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology (HUST) Wuhan Hubei 430074 P.R. China
3. School of Optical and Electronic Information (OEI) Huazhong University of Science and Technology (HUST) Wuhan Hubei 430074 P.R. China
4. School of Energy and Environment & Department of Materials Science and Engineering City University of Hong Kong Kowloon Tong Hong Kong 999077 P.R. China