1. Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2. School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
3. Tianjin Key Laboratory of Film Electronic and Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China