报告人简介：

  Chuanjiang Qin received his PhD in 2008 from the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, under the supervisor of Prof. Lixiang Wang in polymer chemistry. After his studies as a Postdoctoral Fellow with Prof. Wai-Yeung Wong at Hong Kong Baptist University, he moved to Dr. Liyuan Han’s group at National Institute for Materials Science in Japan in 2010. Since 2014 he joined Prof. Chihaya Adachi’s research center at Kyushu University. His research interest is in the field of perovskite and organic optoelectronic materials and devices. He has published more than 60 papers with over 3500 citations, and applied and issued ten Japanese and PCT patents.

摘要：

  Organic-inorganic hybrid halide perovskites have emerged as an interesting class of materials that have excellent photovoltaic properties for application to solar cellsThe power conversion efficiency of perovskite solar cells (PSCs) over 24% has recently been realized through systematic optimization of materials and fabrication processes. However, the stability of PSCs is still not satisfied to practical applications, and the actual degradation mechanisms of PSCs are not well understand. Here, we firstly investigate the degradation mechanisms of CH3NH3PbI3-based PSCs using a thermally stimulated current technique. We observed that a large density of hole traps is formed in PSCs degraded by continuous solar illumination and that the formation of hole traps is strongly related to the stability. One source of the traps is metallic lead resulting from photodegradation of CH3NH3PbI3 under continous light irradiation. We greatly extended the lifetime of PSCs under standard laboratory weathering testing (ISOS-L-1 Laboratory) from 150 hours to 4000 hours by suppressing the formation of Frenkel defect-metallic lead. Futhermore, we revealed influrence of phase transition on the device stability, and developed efficient and thermally stable PSCs under standard thermal cycling test (ISOS-T-1 Thermal Cycling).

主  持 人：沈亮 教授

报告时间：2019年7月19日 10:00

报告地点：唐敖庆楼D311报告厅

主办单位：电子科学与工程学院

                 集成光电子学国家重点实验室

                 国家高等学校学科创新引智基地

                 物质科学吉林省高校高端科技创新平台