1. Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, 315211 Ningbo, Zhejiang, China
2. Qingdao Haier Smart Technology R&D Co., Ltd., 266101 Qingdao, China
3. School of Science, Chongqing University of Posts and Telecommunications, 400065 Chongqing, China