Effects of linking units on fused-ring electron acceptor dimers. Issue 27 (2nd July 2020)

• Record Type: Journal Article
• Authors: Cai, Guilong; Xiao, Yiqun; Li, Mengyang; Rech, Jeromy James; Wang, Jiayu; Liu, Kuan; Lu, Xinhui; Tang, Zheng; Lian, Jiarong; Zeng, Pengju; Wang, Yiping; You, Wei; Zhan, Xiaowei
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 27(2020)
• Page Start: 13735
• Page End: 13741
• Publication Date: 2020-07-02
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta03058a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Three new fused-ring electron acceptors were designed and synthesized based on indaceno[3, 2- b ]dithiophene dimer cores. Effects of the linking units on optical, electronic, morphologic, and photovoltaic properties were revealed. Abstract : Three fused-ring electron acceptors (SIDIC, DIDIC and TIDIC ) were designed and synthesized using single bond, vinylene and acetylene units linked indaceno[3, 2- b ]dithiophene dimers as electron-rich cores and 3-(1, 1-dicyanomethylene)-5, 6-difluoro-1-indanone as electron-deficient termini. These molecules exhibit strong absorption from 550 to 900 nm with large attenuation coefficients of 1.8–2.0 × 10 5 M −1 cm −1 and high electron mobilities of 2.2–4.9 × 10 −3 cm 2 V −1 s −1 . In combination with wide-bandgap polymer FTAZ as a donor, organic solar cells exhibit efficiencies of 9.3–13.1%. Effects of the linking units on optical, electronic, morphologic, and photovoltaic properties were revealed. Relative to SIDIC, vinylene-bridged DIDIC shows red-shifted absorption, while acetylene-bridged TIDIC shows blue-shifted absorption. Compared with SIDIC and DIDIC, TIDIC has a lower HOMO, higher electron mobility, and higher device efficiency.