1. Institute of Photo-electronics Thin Film Devices and Technique of Nankai University, Key Laboratory of Photo-electronics Thin Film Devices
and Technique of Tianjin, Key Laboratory of Photo-Electronic Information
Science and Technology of Ministry of Education (Nankai University), Tianjin 300071, China
2. Institute
of Information Functional Materials, Hebei University of Technology, Tianjin 300130, China