通过侧链工程提高A-D-A'-D-A型非稠环电子受体的光伏性能

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中文摘要：非稠环电子受体(NFREA)具有合成简单和结构修饰灵活的特点,是制备高性能低成本有机太阳电池(OSCs)的理想材料.本工作以不同侧链修饰的二氟苯并三氮唑(ffBTz)作为弱缺电子核(A'),分别设计合成了三种A-D-A'-D-A型NFREA,即ffBTz-BO、ffBTz-EH和ffBTz-C4.其中,ffBTz-EH,由于其合适的侧链长度,在分子结晶度和分子堆积优势取向之间取得了平衡,从而获得了更高的电荷迁移率.并且得益于高效的电荷传输和最合适的相分离形貌,基于ffBTz-EH的OSC获得12.96％的最高能量转换效率,这也是A-D-A'-D-A型NFREA获得的最高效率之一.本研究表明,A'核心上的烷基侧链在调节分子结晶度、活性层形貌和进一步调控器件性能方面起着至关重要的作用,这为未来设计高效低成本的A-D-A'-D-A型非稠环电子受体提供了思路.

外文标题：Enhanced photovoltaic performance of A-D-A'-D-A type non-fused ring electron acceptors via side chain engineering

外文摘要：Featuring simplified synthesis and flexible chemical alteration,non-fused ring electron acceptors(NFREAs)are the ideal candidates for constructing low-cost organic solar cells(OSCs).Herein,we report three A-D-A'-D-A type NFREAs,namely ffBTz-BO,ffBTz-EH,and ffBTz-C4,where difluorinated benzotriazole(ffBTz)with different side chain lengths were employed as the weak electron-defi-cient A'core.Compared with ffBTz-BO and ffBTz-C4,ffBTz-EH with appropriate side chain length strikes a balance be-tween the enhanced molecular crystallinity and the favorable face-on orientation,resulting in high charge mobilities.Consequently,ffBTz-EH-based OSC delivered the highest power conversion efficiency(PCE)of 12.96％enabled by its efficient charge transport and most suitable phase separation,which represents one of the highest efficiencies among A-D-A'-D-A type NFREAs.This work demonstrates that alkyl side chain on the central A'core plays a critical role in tuning molecular crystallinity,active layer morphology,and further device performance,which provides a meaningful perspective for designing highly efficient A-D-A'-D-A type non-fused ring electron acceptors in the future.

外文关键词：

organic solar cellsnon-fused ring electron acceptorsside chain engineeringmolecular orientationpower conversion efficiency

作者：

周霞、魏文魁、庞淑婷、袁熙越、李俊宇、黄飞、曹镛、段春晖

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作者单位：

School of New Energy,Ningbo University of Technology,Ningbo 315336,China

Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China

Molecular Materials and Nanosystems & Institute for Complex Molecular Systems,Eindhoven University of Technology,5600 MB Eindhoven,Netherlands

关键词：

organic solar cells non-fused ring electron acceptors side chain engineering molecular orientation power conversion efficiency

基金：

Ministry of Science and Technology of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGuangdong Innovative and Entrepreneurial Research Team ProgramGuangdong Basic and Applied Basic Research FoundationStartup Founding Research and Cultivation Project funded by Ningbo University of TechnologyStartup Founding Research and Cultivation Project funded by Ningbo University of Technology

项目编号：

2019YFA0705900U20A600222275058221090462019ZT08L0752022B15151200082022KQ652022TS03

出版年：

2024

DOI：

10.1007/s40843-023-2867-6

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(5)