1. Hunan Provincial Key laboratory of Thin Film Materials and Devices School of Material Sciences and Engineering Xiangtan University Xiangtan 411105 China
2. School of Physics and Optoelectronics Xiangtan University Hunan 411105 China
3. Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China
4. Guilin Electrical Equipment Scientific Research Institute Co., Ltd. Guilin 541010 China
5. School of Materials Science & Engineering Anhui University Hefei 230601 P. R. China