1. Institute of Microelectronics, Tsinghua University, Beijing 100084, China
2. Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing 100084, China
3. Department of Electrical Engineering and Computer Science and Department of Bioengineering, College of Engineering, University of California, Berkeley, California 94720, United States
4. Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
5. Center for Flexible Electronics Technology, Tsinghua University, Beijing 100084, China