1. Electronic Materials Research Laboratory & Multifunctional Materials and Structures, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
2. Micro-optoelectronic Systems Laboratories, Xi'an Technological University, Xi'an, Shaanxi, 710032, China
3. Electrical Insulation Research Center, Institute of Materials Science, University of Connecticut, 97 North Eagleville Road, Storrs, CT 06269, USA
4. State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
5. International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China
6. School of Electronic and Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
7. School of Material Science and Energy Engineering, Foshan University, Foshan, Guangdong, 528000, China