Alkoxy substitution on IDT-Series and Y-Series non-fullerene acceptors yielding highly efficient organic solar cells. Issue 12 (12th March 2021)

• Record Type: Journal Article
• Authors: Chen, Yuzhong; Liu, Tao; Ma, Lik-Kuen; Xue, Wenyue; Ma, Ruijie; Zhang, Jianquan; Ma, Chao; Kim, Ha Kyung; Yu, Han; Bai, Fujin; Wong, Kam Sing; Ma, Wei; Yan, He; Zou, Yingping
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 12(2021)
• Page Start: 7481
• Page End: 7490
• Publication Date: 2021-03-12
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta10953c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The alkoxy substitution were taken on IDT-series and Y-series non-fullerene acceptors. The resulting molecules named IDTN-O and Y6-O both exhibit better performance, indicating it is an effective method to optimize these two types of acceptors. Abstract : In this work, we attempt to figure out alkoxy-substitution effects on two kinds of well-known non-fullerene acceptors (NFAs), IDT-series and Y-series acceptors, by placing alkoxy side chains on the β-positions of the outer thiophene units. The resulting molecules, named IDTN-O and Y6-O, exhibit different properties compared to the original acceptors named IDTN and Y6 . The HOMO and LUMO levels of IDTN-O are slightly upshifted at the same time, which causes a slightly higher open-circuit voltage ( V oc ) without sacrificing the short-circuit current density ( J sc ) of the devices. J71 :IDTN-O blend films can also achieve a better blend morphology due to the conformational locking effect and higher dipole moment induced by the alkoxy groups, which helps achieve a higher fill factor (FF). In addition, Y6-O exhibits significantly upshifted LUMO levels compared to Y6, leading to a high V oc of 0.95 V. PM6 :Y6-O blend films can also maintain an optimal blend morphology through side-chain engineering, which leads to an excellent FF of 78.0%. As a result of alkoxy substitution, both IDTN-O and Y6-O -based devices can achieve better performances of 12.1% and 16.6% than IDTN and Y6 -based devices (10.9% and 15.7%), which indicates that this is an effective method to optimize these two types of NFAs.