时间：2023年3月14日（周二）上午10:00~11:30

Time：10:00-11:30 AM, Tuesday, Mar. 14, 2023

地点：西湖大学云谷校区E10-222

Venue: E10-222, Yungu Campus

主持人：西湖大学讲席教授 孙立成

Host: Dr. Licheng Sun, Chair Professor, Westlake University

主讲人/Speaker：

Alex Jen

Lee Shau Kee Chair Professor & Director, 

Hong Kong Institute for Clean Energy, City University of Hong Kong

Alex Jen is the Lee Shau-Kee Chair Professor and Director of the Hong Kong Institute for Clean Energy at the City University of Hong Kong. He also served as the Provost of CityU during 2016-2020. He received his B.S. from the National Tsing Hua University in Taiwan, China and Ph.D. from the University of Pennsylvania in USA. Before arriving CityU, he had served as the Boeing-Johnson Chair Professor and Chair of the Department of Materials Science & Engineering at the University of Washington, Seattle. He was also appointed as the Chief Scientist for the Clean Energy Institute endowed by the Washington State Governor. He is a distinguished researcher who published more than 1000 SCI papers with >82,000 citations and an H-index of 149. He also co-invented 65 patents and invention disclosures. Due to his enormous contributions, he was selected as the recipient for the CityU’s 2021 “Outstanding Research Award” and 2022 “President Award”. 

For his pioneering contributions in organic photonics and electronics, Professor Jen was elected as Fellow by both European Academy of Sciences and Washington State Academy of Sciences. He was also elected as Fellow for several professional societies, including AAAS, MRS, ACS, PMSE, OSA, and SPIE. He was named by the Times Higher Education (THE) in 2018 as one of the “Top 10 university researchers in Perovskite Solar Cell Research”. In addition, he was recognized by Thomson Reuters as one of the "World’s Most Influential Scientific Minds of 2015”and 2016 and as a "Highly Cited Researcher" in Materials Science from 2014-2022.

报告题目/Title:

 High Performance Organic and Perovskite Solar Cells for Clean Energy

讲座摘要/Abstract:

Minimizing energy loss and increasing the field factor are key aspects to transcend the current limitations on the performance of organic photovoltaics (OPV). However, an inherent limit has set for an organic bulk-heterojunction (BHJ) blends from prominent non-geminate recombination through non-radiative charge transfer states. Our recent study on charge recombination in BHJ and Planar-Mixed Heterojunction (PMHJ) blends comprising a crystalline polymer donor with Se-containing Y6-derived non-fullerene acceptors has shown both high photovoltaic internal quantum efficiencies and high external electroluminescence quantum efficiencies. Crystallographic and spectroscopic studies reveal that the pseudo-2D, fused-ring molecular acceptors are not only intrinsically highly luminescent but also meets the criteria in achieving intrinsically radiative recombination within the blend, by promoting delocalized excitons with much longer luminescent lifetime and reduced exciton binding energies. These results provide the important demonstration of radiative non-geminate charge recombination in an efficient OPV blend to achieve PCEs above 19%. Moreover, a new concept, ”Dilution Effect” is introduced to explain the commonly observed composition-dependent Voc and reduced photovoltage loss in highly efficient ternary-based devices due to significantly reduced phonon-electron coupling. At the end, several novel interface/additive engineering approaches will be discussed that facilitated the demonstration of record-high PCE of ~25% in inverted perovskite solar cells and very efficient lead-capturing from decomposed perovskite devices.

讲座联系人/Contact:

科技合作部 sci-tech02@westlake.edu.cn