1. Institute of Photoelectronic Thin Film Devices and Technology of Nankai University, Solar Energy Research Center of Nankai University, Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Engineering Research Center of Thin Film Optoelectronics Technology, Ministry of Education, No 38 Tongyan Road, Jinnan District, Tianjin 300350, China
2. College of Electronic Information and Optical Engineering, Nankai University, No 38 Tongyan Road, Jinnan District, Tianjin 300350, China