1. College of Physics and Optoelectronic Engineering, Harbin Engineering University 1 , 150001 Harbin, China
2. Department of Physics and Electronic Information, Anhui Normal University 2 , 241002 Wuhu, China
3. State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University 3 , Hangzhou 311200, China
4. Institute of Advanced Semiconductors and Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices, Hangzhou Innovation Center, Zhejiang University 4 , Hangzhou 311200, China
5. Department of Physics, Jiangxi Agricultural University 5 , Nanchang, Jiangxi 330045, China
6. College of Engineering, Guangzhou College of Technology and Business 6 , Guangzhou 510850, China