物理与电子工程学院2019学术论坛之二十一

报告题目：2D Ruddlesden–Popper Perovskites for Solar cell application

时间：2019年4月30日上午9：30

地点：理学实验楼409

报告人：Kaibo Zheng，丹麦科技大学副教授

摘要: During the past several years, the hybrid organic-inorganic perovskite solar cells have emerged as promising candidates for next-generation energy sources with impressive power conversion efficiency (PCE) up to 22.7%. Despite their skyrocketing development, conventional three-dimensional (3D) perovskites in the formula of ABX3 where A is a monovalent organic cation, B is a divalent metallic compound and X represents halide anion are unstable when exposed to light, heat or moisture during operation, which impede their commercial applications. In contrast, the emerging two-dimensional (2D) Ruddlesden−Popper (RP) perovskites have recently attracted increasing attention due to their superior ambient stability afforded by the hydrophobic nature of newly introduced organic spacers. Some proof of concept devices based on 2D perovskites have been reported with decent stability. However, their random crystal packing and impeded charge transport in vertical direction restrict the enhancement of photovoltaic performance. In this talk, a brief background introduction on the conventional perovskites and 2D RP perovskites and their application in solar cells will be provided. In addition, our recent work to engineer of the molecular design of the 2D perovskites as well as the solution process for the synthesis for 2D perovskites solar cells will also be introduced, which drastically improved the device performance. Ultrafast time-resolved spectroscopies were also utilized to explore the underlying photo physical mechanism for the improvement of the device performance.

报告人简介：郑凯波，2010年博士毕业于复旦大学材料科学系物理电子学专业，与2010年至2018年赴瑞典隆德大学化学物理系瑞典皇家科学院院士Tonu Pullerits课题组从事博士后工作，现任丹麦技术大学化学系副教授，瑞典隆德大学化学物理系高级研究员。研究方向包括纳米结构光电材料的超快动力学与光物理过程，钙钛矿低维结构的器件机理与载流子动力学研究，光电材料的超快结构动力学研究。目前，已在国际著名期刊发表SCI论文90余篇，文章已被引用3400余次，H因子30。