Step-by-Step Modulation of Crystalline Features and Exciton Kinetics for 19.2％Efficiency Ortho-Xylene Processed Organic Solar CellsOACSTPCD
Step-by-Step Modulation of Crystalline Features and Exciton Kinetics for 19.2％Efficiency Ortho-Xylene Processed Organic Solar Cells
With plenty of popular and effective ternary organic solar cells(OSCs)construction strategies proposed and applied,its power conversion efficiencies(PCEs)have come to a new level of over 19％in single-junction devices.However,previous studies are heavily based in chloroform(CF)leaving behind substantial knowledge deficiencies in understanding the influence of solvent choice when introducing a third component.Herein,we present a case where a newly designed asymmetric small molecular acceptor using fluoro-methoxylated end-group modifica-tion strategy,named BTP-BO-3FO with enlarged bandgap,brings differ-ent morphological evolution and performance improvement effect on host system PM6:BTP-eC9,processed by CF and ortho-xylene(o-XY).With detailed analyses supported by a series of experiments,the best PCE of 19.24％for green solvent-processed OSCs is found to be a fruit of finely tuned crystalline ordering and general aggregation motif,which furthermore nourishes a favorable charge generation and recombination behavior.Likewise,over 19％PCE can be achieved by replacing spin-coating with blade coating for active layer deposition.This work focuses on understanding the commonly met yet frequently ignored issues when building ternary blends to demonstrate cutting-edge device performance,hence,will be instructive to other ternary OSC works in the future.
Bosen Zou;Jiaying Wu;Chuluo Yang;Gang Li;He Yan;Weiwei Wu;Top Archie Dela Peña;Ruijie Ma;Yongmin Luo;Yulong Hai;Xiyun Xie;Mingjie Li;Zhenghui Luo
Department of Chemistry Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction,The Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong,People's Republic of ChinaThe Hong Kong University of Science and Technology,Function Hub,Advanced Materials Thrust,NanshaGuangzhou 511400,People's Republic of ChinaShenzhen Key Laboratory of New Information Display and Storage Materials,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,People's Republic of ChinaDepartment of Chemistry Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction,The Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong,People's Republic of China||The Hong Kong University of Science and Technology,Function Hub,Advanced Materials Thrust,NanshaGuangzhou 511400,People's Republic of China||Department of Applied Physics,The Hong Kong Polytechnic University,Hong Kong,People's Republic of ChinaDepartment of Electronic and Information Engineering,Research Institute for Smart Energy(RISE),Guangdong-Hong Kong-Macao(GHM)Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong 999077,People's Republic of ChinaDepartment of Applied Physics,The Hong Kong Polytechnic University,Hong Kong,People's Republic of China
Organic solar cellsTernary designSolvent selectionFlouro-methoxylated end groupMorphological ordering
《纳微快报（英文）》 2024 (002)
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R.Ma thanks the support from PolyU Distinguished Postdoc Fellowship(1-YW4C).Z.Luo thanks the National Natural Science Foundation of China(NSFC,No.22309119).J.Wu thanks the Guangdong government and the Guangzhou government for funding(2021QN02C110)and the Guangzhou Municipal Science and Technology Project(No.2023A03J0097 and 2023A03J0003).H.Yan appreciates the sup-port from the National Key Research and Development Program of China(No.2019YFA0705900)funded by MOST,the Basic and Applied Research Major Program of Guangdong Province(No.2019B030302007),the Shen Zhen Technology and Inno-vation Commission through(Shenzhen Fundamental Research Program,JCYJ20200109140801751),the Hong Kong Research Grants Council(research fellow scheme RFS2021-6S05,RIF pro-ject R6021-18,CRF project C6023-19G,GRF project 16310019,16310020,16309221,and 16309822),Hong Kong Innovation and Technology Commission(ITC-CNERC14SC01),Foshan-HKUST(Project NO.FSUST19-CAT0202),Zhongshan Municipal Bureau of Science and Technology(NO.ZSST20SC02)and Tencent Xplorer Prize.
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