Title：Passivation strategies for mitigating defect challenges in halide perovskite LEDs

Speaker：Prof. Bo Ram Lee, Pukyong National University

Host：Xiaoyu Zhang

Time：Jan. 17, 2023 15:00

Location: Zoom 829 9348 5008

link：

https://us02web.zoom.us/j/82993485008?pwd=SytJZFQyQlZhZHN4a3Q3NUh5TEpvdz09

Abstract：

Despite the well-established defect tolerance of metal halide perovskites (MHPs), there are multiple sources of defects in MHPs such as grain boundaries in thin films, colloidal nanocrystal surfaces, and heterointerface formed with charge-transport-layer, all of which play a crucial role in determining light-emitting diodes (LEDs) efficiency and stability. Defect passivation strategies have become essential tools for improving device performance. Here, we analysed and correlated the origins of the defects in MHPs to their influence on the optical and charge-carrier transport properties, and systematically reviewed mechanistic principles of promising passivation strategies to either eliminate or suppress various defects that undermine the potential of perovskite LEDs. Several challenges and prospects for the future development of MHP LEDs have been identified. This review could provide a valuable reference for the community to promote the optimisation and stabilisation for developing high-performance MHP LEDs and further uncover the potential of MHPs for optoelectronic devices.

1. Adv. Mater. 2022, 10.1002/adma.202209486.

2. Nature 2021, 591, 72–77.

3. J. Am. Chem. Soc. 2019, 141, 1269.

Introduction to the speaker：

Prof. Bo Ram Lee is an associate professor in Department of Physics, Pukyong National University (Republic of Korea).

He obtained his PhD. Degree in School of Materials of Science and Engineering, Ulsan National Institute of Science and Technology in 2015. Then he became a post-doctoral of his PhD. advisor, Prof. Myoung Hoon Song. And he worked with Prof. Richard H. Friend as the research associate from 2015-2017. After that, he joined the Pukyong National University and set up the Hybrid Optoelectronic Materials & Electronics (HOME) Lab. HOME group is focusing on the development of organic-inorganic hybrid semiconducting materials and their application to the optoelectronic devices such as LEDs, solar cells. He published 96 SCI journal papers, including Nature, Joule, Nature Communication, Advanced Materials, etc.