1. Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guilin 541004, People's Republic of China
2. Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China
3. Department of Materials Physics, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
4. Research Center for Smart Energy Technology, Toyota Technological Institute, Nagoya 468-8511, Japan
5. Department of Materials Science and Engineering, Innovative Global Program, Faculty of Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan