1. Institute of Microelectronics of the Chinese Academy of Sciences, Key Laboratory of Microelectronics Devices and Integrated Technology, No. 3, Bei-Tu-Cheng West Road, Beijing 100029, China
2. Institute of Microelectronics of the Chinese Academy of Sciences, Key Laboratory of Microelectronics Devices and Integrated Technology, No. 3, Bei-Tu-Cheng West Road, Beijing 100029, ChinabUniversity of Chinese Academy of Sciences, No. 19, Yu-Quan Road, Beijing 100049, China