1. Beijing National Research Center for Information Science and Technology (BNRist), Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
2. Center for Flexible Electronics Technology, Tsinghua University, Beijing 100084, China
3. Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi’an 710119, China
4. State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Qianjin Street 2699, Changchun 130012, China
5. College of Physics, Jilin University, Changchun 130012, China
6. The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, Xidian University, Xi’an 710071, China