1. National-Local Joint Engineering Laboratory of New Energy Photovoltaic Devices, Key Laboratory of Brain-Like Neuromorphic Devices and Systems of Hebei Province, College of Electron and Information Engineering, Hebei University, Baoding 071002, P. R. China
2. School of Integrated Circuits, Anhui University, Hefei, Anhui 230601, P. R. China
3. Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics of Chinese Academy of Sciences, Beijing, 100029, P. R. China
4. Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore
5. Frontier Institute of Chip and System Fudan University Shanghai 200433, P. R. China