{"title":"Asymmetric Acceptor Featuring Fused‐Imidazole Central Core Enabling Organic Solar Cells with 19.4% Efficiency","authors":"Huihuang Zhang, Yongqiang Chai, Jinpeng Zhao, Enwei Zhu, Yu Chen, Liping Liu, Dirk M. Guldi","doi":"10.1002/aenm.202500332","DOIUrl":null,"url":null,"abstract":"Manipulating the central cores of non‐fullerene acceptors is crucial for enhancing the performance of organic solar cells (OSCs). While recent Y‐acceptors have leveraged a two‐dimensional (2D) π‐expansion strategy to incorporate symmetric fused‐pyrazine central cores, challenges remain in achieving higher device performance. In this study, BTQT‐4F, a novel Y‐acceptor with an asymmetric fused‐imidazole core is introduced. Density functional theory calculations reveal that the asymmetric geometry causes a molecular dipole moment of ≈8.5 Debye. Single‐crystal X‐ray diffraction confirms versatile packing modes that establish efficient 3D charge‐transport channels. Using BTQT‐4F, a power conversion efficiency (PCE) of 18.22% with an open‐circuit voltage (<jats:italic>V<jats:sub>OC</jats:sub></jats:italic>) of 0.890 V is achieved in PM6:BTQT‐4F binary OSCs. Notably, PM6:BTP‐eC9:BTQT‐4F ternary OSCs realized a PCE of 19.4%, surpassing previously reported efficiencies for OSCs based on 2D π‐conjugated Y‐acceptors. This work underscores the potential of implementing an asymmetric fused‐imidazole central core in pushing the boundaries of the Y‐acceptor design, opening avenues for further OSC performance enhancements.","PeriodicalId":111,"journal":{"name":"Advanced Energy Materials","volume":"26 1","pages":""},"PeriodicalIF":24.4000,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Energy Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1002/aenm.202500332","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Manipulating the central cores of non‐fullerene acceptors is crucial for enhancing the performance of organic solar cells (OSCs). While recent Y‐acceptors have leveraged a two‐dimensional (2D) π‐expansion strategy to incorporate symmetric fused‐pyrazine central cores, challenges remain in achieving higher device performance. In this study, BTQT‐4F, a novel Y‐acceptor with an asymmetric fused‐imidazole core is introduced. Density functional theory calculations reveal that the asymmetric geometry causes a molecular dipole moment of ≈8.5 Debye. Single‐crystal X‐ray diffraction confirms versatile packing modes that establish efficient 3D charge‐transport channels. Using BTQT‐4F, a power conversion efficiency (PCE) of 18.22% with an open‐circuit voltage (VOC) of 0.890 V is achieved in PM6:BTQT‐4F binary OSCs. Notably, PM6:BTP‐eC9:BTQT‐4F ternary OSCs realized a PCE of 19.4%, surpassing previously reported efficiencies for OSCs based on 2D π‐conjugated Y‐acceptors. This work underscores the potential of implementing an asymmetric fused‐imidazole central core in pushing the boundaries of the Y‐acceptor design, opening avenues for further OSC performance enhancements.
期刊介绍:
Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small.
With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics.
The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.