1. School of Science, Ministry of Key Laboratory on Photoelectric Oil-Gas Logging and Detecting, Xi’an Shiyou University, Xi’an, People’s Republic of China
2. Xi’an University of Science and Technology, Xi’an, People’s Republic of China
3. School of Microelectronics, Key Laboratory of Wide Band-Gap Semiconductor Materials and Device, Xidian University, Xi’an, People’s Republic of China