Enhancing Photovoltaic Performance of Nonfused-Ring Electron Acceptors via Asymmetric End-Group Engineering and Noncovalently Conformational Locks  

作　　者：Bo Liu Congqi Li Xiaobin Gu Yinghui Han Zhixiang Wei Yunhao Cai Xin Zhang Hui Huang Yanping Huo 

机构地区：[1]School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou,Guangdong,510006 China [2]College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics,University of Chinese Academy of Sciences,Beijing,100049 China [3]College Resources and Environment,University of Chinese Academy of Sciences,Beijing,100049 China [4]Center for Excellence in Nanoscience (CAS) & Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS),National Center for Nanoscience and Technology,Beijing,100190 China

出　　处：《Chinese Journal of Chemistry》2024年第5期485-490,共6页中国化学（英文版）

基　　金：the financial support fromtheNSFC(21975055,U2001222,52103352,52120105006,and 51925306);National Key R&D Program of China(2018FYA 0305800);Key Research Program of Chinese Academy of Sciences(XDPB08-2);the Youth Innovation Promotion Association of Chinese Academy of Sciences(2022165);the Fundamental Research Funds for the Central Universities.DFT results described in this article were obtained from the National Supercomputing Centre in Shenzhen(Shenzhen Cloud Computing Centre).

摘　　要：By employing the asymmetric end-group engineering,an asymmetric nonfused-ring electron acceptor(NFREA)was designed and synthesized.Compared with the symmetric analogs(NoCA-17 and NoCA-18),NoCA-19 possesses broader light absorption range,more coplanarπ-conjugated backbone,and appropriate crystallinity according to the experimental and theoretical results.The organic solar cells based on J52:NoCA-19 exhibited a power conversion efficiency as high as 12.26%,which is much higher than those of J52:NoCA-17(9.50%)and J52:NoCA-18(11.77%),mainly due to more efficient exciton dissociation,better and balanced charge mobility,suppressed recombination loss,shorter charge extraction time,longer charge carrier lifetimes,and more favorable blend film morphology.These findings demonstrate the great potential of asymmetric end-group engineering in exploring low-cost and high-performance NFREAs.

关 键 词：Organic solar cells Nonfused-ring electron acceptors Asymmetric end-group engineering Noncovalently conformational locks Low-cost acceptors 

分 类 号：O62[理学—有机化学]