1. Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
2. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Hefei National Laboratory for Physical Sciences at the Microscale Department of Materials Science and Engineering CAS Key Laboratory of Materials for Energy Conversion University of Science and Technology of China Hefei Anhui 230026 P. R. China
4. Key Laboratory of Materials Processing and Mold (Zhengzhou University) Ministry of Education Zhengzhou University Zhengzhou 450002 P. R. China
5. Dalian National Laboratory for Clean Energy (DNL) Chinese Academy of Sciences (CAS) 457 Zhongshan Road Dalian Liaoning 116023 P. R. China