Instructors/Speakers
Prof. Zhanhua Wei
College of Materials Science and Engineering Huagiao University
Abstract
Metal halide perovskites are emerging as promising optoelectronic materials with advantages like easy solution-based fabrication, low material cost, high defect tolerance, and high PLQY. Our group has been focusing on perovskite LEDs for years. In 2018, we prepared a quasi-core-shell structure of CsPbBry@CHaNHgBr, passivated the non-radiative defects, improved charge injection balance, and achieved a milestone EQE of over 20%. In 2021, we utilized the TFPPO to tune the crystalline dimension of 2D/3D perovskite, reducing the defect formation and significantly improving the PLQY. As a result, we got an impressive EQE of over 25%. Moreover, we will introduce some progress about manipulating crystal growth, regulating phase composition, optimizing device structure, and lead-free perovskite-based LEDs. As for the perovskite solar cells (PSCs), we have been focused on preparing ultra-pure FAPblg active layer, synthesis of functional fullerene and the application in PCs, perovskite/silicon tandem solar cells. Recently, we successfully boosted the power conversion efficiency to over 25 % with an operational lifetime of over 1,500 h.
Biography
Zhanhua Wei is a full-time professor at the Institute of Luminescent Materials and Information Displays, College of Materials Science and Engineering, Huaqiao University, China. He received his B.S. degree in 2011 from the Department of Chemistry, Xiamen University, China, and his Ph.D. degree in 2015 from Prof. Shihe Yang’s group, Department of Chemistry, Hong Kong University of Science and Technology, China. After postdoc research with Prof. Qihua Xiong at Nanyang Technological University, he joined Huaqiao University as a principal investigator in May 2016. His current research focuses on perovskite light-emitting diodes, perovskite solar cells, and other optoelectronic materials and devices. He has published over 60 peer-reviewed papers in scientific journals like Nature, J. Am. Chem. Soc. and Adv. Mater.