1. KAUST Solar Center, Physical Sciences and Engineering Division (PSE), Materials Science and Engineering Program (MSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
2. Department of Material Science and Technology, Taizhou University, Taizhou 318000, P. R. China
3. Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong 999077, P. R. China
4. Friedrich-Alexander-Universität Erlangen-Nürnberg, Materialien für Elektronik und Energietechnik (i-MEET), Martensstraße 7, 91058 Erlangen, Germany
5. Forschungszentrum Jülich GmbH, Helmholtz-Institut Erlangen Nürnberg für Erneuerbare Energien (HI ERN), Immerwahrstraße 2, 91058 Erlangen, Germany
6. Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hung Hum, Kowloon, Hong Kong SAR, P. R. China