1. Key Laboratory of Novel Thin-Film Solar Cells, Division of Solar Energy Materials and Engineering, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, 230031, People’s Republic of China
2. School of Renewable Energy, North China Electric Power University, No 2, Beinong Rd, Changping, Beijing, 102206, People’s Republic of China
3. Laboratory for Photonics and Interfaces, Institution of Chemical Sciences and Engineering, School of Basic Sciences, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland