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
Enhanced photovoltaic performance of A-D-A'-D-A type non-fused ring electron acceptors via side chain engineering
周霞 1魏文魁 2庞淑婷 2袁熙越 2李俊宇 3黄飞 2曹镛 2段春晖2
作者信息
- 1. 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
- 2. Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China
- 3. Molecular Materials and Nanosystems & Institute for Complex Molecular Systems,Eindhoven University of Technology,5600 MB Eindhoven,Netherlands
- 折叠
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.
Abstract
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.
关键词
organic solar cells/non-fused ring electron acceptors/side chain engineering/molecular orientation/power conversion efficiencyKey words
organic solar cells/non-fused ring electron acceptors/side chain engineering/molecular orientation/power conversion efficiency引用本文复制引用
基金项目
Ministry of Science and Technology of China(2019YFA0705900)
National Natural Science Foundation of China(U20A6002)
National Natural Science Foundation of China(22275058)
National Natural Science Foundation of China(22109046)
Guangdong Innovative and Entrepreneurial Research Team Program(2019ZT08L075)
Guangdong Basic and Applied Basic Research Foundation(2022B1515120008)
Startup Founding Research and Cultivation Project funded by Ningbo University of Technology(2022KQ65)
Startup Founding Research and Cultivation Project funded by Ningbo University of Technology(2022TS03)
出版年
2024
NETL
NSTL
万方数据