1. Institute of Photoelectronic Thin Film Devices and Technology of Nankai University Tianjin 300350 P. R. China
2. Key Laboratory of Optoelectronic Thin Film Devices and Technology of Tianjin Tianjin 300350 P. R. China
3. Engineering Research Center of Thin Film Optoelectronics Technology of Ministry of Education Nankai University Tianjin 300350 P. R. China
4. College of Electronic Information and Optical Engineering of Nankai University National Institute for Advanced Materials Nankai University Tianjin 300350 P. R. China
5. College of Microelectronics and Communication Engineering Chongqing University Chongqing 400044 P. R. China
6. No. 24 Research Institute of China Electronics Technology Group Corporation Chongqing 400060 P. R. China