1. Institute for Advanced Study, Nanchang University, Nanchang 330031, China
2. Institute of Photovoltaics, Nanchang University, Nanchang 330031, China
3. School of Electrical and Mechanical Engineering, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528400, China
4. Department of Science and Technology, Nanchang University College of Science and Technology, Jiujiang 332020, China