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X-WR-CALDESC:Events for Department of Electrical and Computer Engineering (HKUECE) 電機與計算機工程系
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DTSTART;VALUE=DATE:20230816
DTEND;VALUE=DATE:20230817
DTSTAMP:20260515T222628
CREATED:20230810T080043Z
LAST-MODIFIED:20250114T095847Z
UID:17570-1692144000-1692230399@ece.hku.hk
SUMMARY:High-performance Perovskite Optoelectronic Devices via Defect Passivation and Potential Career Development Opportunities at Huaqiao University
DESCRIPTION: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. The MHPs have shown great potential in applications like LEDs and solar cells. \nAs for the perovskite LEDs\, before 2016\, it was highly challenging to prepare a high-quality perovskite emitting layer by the conventional method. The as-prepared perovskite films always show too many pin-holes\, disordered lattices\, and non-radiative defects. As a result\, the corresponding device performance\, especially for the external quantum efficiency (EQE)\, is far behind organic and quantum dot LEDs. Our group has been focusing on perovskite LEDs for years. In 2018\, we prepared a quasi-core-shell structure of CsPbBr3@CH3NH3Br\, passivated the non-radiative defects\, improved the charge injection balance\, and achieved a milestone EQE of over 20%.1 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%.2 Moreover\, we will introduce some progress about manipulating crystal growth\, regulating phase composition3\, optimizing device structure\, and lead-free perovskite-based LEDs4. \nAs for the perovskite solar cells (PSCs)\, we have been focused on preparing ultra-pure FAPbI3 active layer5\, synthesis of functional fullerene\, and the application in PSCs\, 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. \nIn addition to the scientific talk\, Prof. Wei will also discuss potential career development opportunities available at Huaqiao University. Specifically\, he will discuss potential recruitment in the following research directions (including but not limited to): \n\nElectroluminescent materials and devices\, such as Perovskite LED\, QLED\, and OLED.\nNovel photovoltaic materials and devices\, such as perovskite solar cells\, organic solar cells\, and other new photovoltaic devices.\nOptics and device physics and related simulation calculations.\nOther energy optoelectronic-related materials and device applications\, such as photodetectors and high-energy ray detectors.\n\nKeywords: Perovskite\, LEDs\, Solar Cells\, Defect Passivation  \nReference:  \n\nLin\, K.; Xing\, J.; Quan\, L. N.; de Arquer\, F. P. G.; Gong\, X.; Lu\, J.; Xie\, L.; Zhao\, W.; Zhang\, D.; Yan\, C.; Li\, W.; Liu\, X.; Lu\, Y.; Kirman\, J.; Sargent\, E. H.*; Xiong\, Q.*; Wei\, Z.*\, Perovskite light-emitting diodes with external quantum efficiency exceeding 20 percent. Nature 2018\, 562 (7726)\, 245-248.\nMa\, D.; Lin\, K.; Dong\, Y.; Choubisa\, H.; Proppe\, A. H.; Wu\, D.; Wang\, Y.-K.; Chen\, B.; Li\, P.; Fan\, J. Z.; Yuan\, F.; Johnston\, A.; Liu\, Y.; Kang\, Y.; Lu\, Z.-H.; Wei\, Z.*; Sargent\, E. H.*\, Distribution control enables efficient reduced-dimensional perovskite LEDs. Nature 2021\, 599 (7886)\, 594-598.\nLin\, K.; Yan\, C.; Sabatini\, R. P.; Feng\, W.; Lu\, J.; Liu\, K.; Ma\, D.; Shen\, Y.; Zhao\, Y.; Li\, M.; Tian\, C.; Xie\, L.; Sargent\, E. H. *; Wei\, Z. *\, Dual‐Phase Regulation for High‐Efficiency Perovskite Light‐Emitting Diodes. Advanced Functional Materials 2022\,\nLu\, J.; Guan\, X.; Li\, Y.; Lin\, K.; Feng\, W.; Zhao\, Y.; Yan\, C.; Li\, M.; Shen\, Y.; Qin\, X.; Wei\, Z.*\, Dendritic CsSnI3 for Efficient and Flexible Near-Infrared Perovskite Light-Emitting Diodes.  Mater. 2021\, 33 (44)\, 2104414.\nXie\, L.; Lin\, K.; Lu\, J.; Feng\, W.; Song\, P.; Yan\, C.; Liu\, K.; Shen\,L.; Tian\, C.; Wei\, Z.*\, Efficient and Stable Low-Bandgap Perovskite Solar Cells Enabled by a CsPbBr3-Cluster Assisted Bottom-up Crystallization Approach.  Am. Chem. Soc. 2019\, 141\, 20537.\n\nBiography of the speaker: \nZhanhua 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. 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\, solar cells\, and other optoelectronic materials and devices. He has published over 80 peer-reviewed papers in scientific journals like Nature\, J. Am. Chem. Soc. and Adv. Mater. \nProf. Wei is the Dean of the Institute of Luminescent Materials and Information Displays\, Vice-dean of the College of Materials Science and Engineering at Huaqiao University. \nAll are welcome.
URL:https://ece.hku.hk/events/high-performance-perovskite-optoelectronic-devices-via-defect-passivation-and-potential-career-development-opportunities-at-huaqiao-university/
CATEGORIES:Seminar
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