报告人：Prof. Yanfa Yan（Department of Physics and Astronomy, and Wright Center for Photovoltaics Innovation and Commercialization, University of Toledo）

报告时间：2017年5月18日（周四）晚上19：00 - 21:00

报告地点：beat365体育官方网站新楼五楼多功能厅

报告摘要：

Despite the rapid improvement in the device efficiency of organic-inorganic lead (Pb) halide perovskite solar cells (PVSCs) in the past years, the use of toxic Pb may severely limit their broad applications and commercialization.The development of Pb-free or less Pb PVSCs is highly desirable and has drawn extensive attention. Mixed Sn-Pb ；perovskites not only reduce the usage of toxic Pb, but also provide opportunities for further improvement on power conversion efficiency (PCE) because their bandgaps can be tuned to be more suitable for efficient single-junction solar cell applications. Recently, the PCE of mixed Sn-Pb perovskites has significantly improved, with PCEs as high as more than 15% and open-circuit voltages higher than 800 mV. It is expected that the PCE will continue to increase rapidly. In this talk, I will first review the understanding of the superior photovoltaic properties of Pb halide perovskites and then review the progress of mixed Sn-Pb perovskite solar cells done by ourselves and other groups, and will discuss the potentials and challenges of mixed Sn-Pb perovskite solar cells.