Fused Nonacyclic Electron Acceptors for Efficient Polymer Solar Cells

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• 作者：Shuixing Dai ; Fuwen Zhao ; Qianqian Zhang ; Tsz-Ki Lau ; Tengfei Li ; Kuan Liu ; Qidan Ling ; Chunru Wang ; Xinhui Lu ; Wei You ; Xiaowei Zhan
• 刊名：Journal of the American Chemical Society
• 出版年：2017
• 出版时间：January 25, 2017
• 年：2017
• 卷：139
• 期：3
• 页码：1336-1343
• 全文大小：595K
• ISSN：1520-5126

文摘

We design and synthesize four fused-ring electron acceptors based on 6,6,12,12-tetrakis(4-hexylphenyl)-indacenobis(dithieno[3,2-b;2′,3′-d]thiophene) as the electron-rich unit and 1,1-dicyanomethylene-3-indanones with 0–2 fluorine substituents as the electron-deficient units. These four molecules exhibit broad (550–850 nm) and strong absorption with high extinction coefficients of (2.1–2.5) × 10⁵ M^–1 cm^–1. Fluorine substitution downshifts the LUMO energy level, red-shifts the absorption spectrum, and enhances electron mobility. The polymer solar cells based on the fluorinated electron acceptors exhibit power conversion efficiencies as high as 11.5%, much higher than that of their nonfluorinated counterpart (7.7%). We investigate the effects of the fluorine atom number and position on electronic properties, charge transport, film morphology, and photovoltaic properties.