1. Institute of Photovoltaics/School of Materials Science and Engineering Nanchang University Nanchang 330031 China
2. Suzhou Maxwell Technologies Co. Ltd Suzhou 215200 China
3. Department of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 China
4. Department of Materials Science & Engineering City University of Hong Kong Kowloon Hong Kong 999077 China
5. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 P. R. China
6. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China