1. Engineering Research Center of Automotive Electrics and Control Technology, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
2. National Center for Nanoscience and Technology, Beijing 100190, China
3. Institute of Semiconductor, Guangdong Academy of Sciences, Guangzhou 510651, China
4. National Innovation Center of Advanced Rail Transit Equipment, Zhuzhou 412005, China
5. Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, United Kingdom