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题名: Terminal moiety-driven electrical performance of asymmetric small-molecule-based organic solar cells
作者: Huang, Jianhua1; Zhang, Shanlin2; Jiang, Bo2; Chen, Yuxia2; Zhang, Xinliang2; Fan, Zhuxin1; Yu, Donghong3, 4; Lin, Zhiyong1; Yao, Jiannian2; Zhan, Chuanlang2
刊名: JOURNAL OF MATERIALS CHEMISTRY A
发表日期: 2016
卷: 4, 期:40, 页:15688-15697
收录类别: SCI
英文摘要: With respect to the successes from symmetric small molecules, asymmetric ones have recently emerged as an alternative choice. In this paper, we present the synthesis and photovoltaic properties of four asymmetric small molecule donors. The benzo[1,2-b:4,5-b']dithiophene (BDT) end in the asymmetric push-pull CNR-DPP-BDT (CNR = octyl-2-cyano-3-(thiophen-2-yl)acrylate, DPP = diketopyrrolopyrrole) was tailored from hydrogen (H) to thiophene (T), 2-hexylbithiophene (HTT), and CNR, respectively, obtaining M1, M2, M3, and M4. In this order, the donor-donor interactions are enhanced with an increase of intermolecular forces, such as pi-pi-stacking and van de Waals forces, which enhances aggregation of the donor molecules. In parallel, the molecular dipolarity (vertical bar mu vertical bar) increases in this order from 5.39 D to 6.26 D, 6.34 D, and 6.92 D, respectively, gradually deviating from the value of PC71BM (5.01 D). The increase in the donor-to-PC71BM doplarity difference acts as another factor for enhancing the donor-to-PC71BM phase-separation. The donor/acceptor domain sizes increase from M1 (10 nm) to M2 (20 nm) and M3 (50 nm), and even formation of island-like mesostructured PC71BM aggregates (200 nm) for M4, corresponding to declined short-circuit current density (J(sc)) and fill factor (FF) as well as hole mobility (mu(h)) from M1 to M4. This work reveals that control over the terminal moieties of asymmetric small molecules can be an important factor in tailoring photovoltaic performance.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35502
Appears in Collections:光化学实验室_期刊论文

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作者单位: 1.Huaqiao Univ, Coll Mat Sci & Engn, Xiamen 361021, Peoples R China
2.Chinese Acad Sci, Inst Chem, CAS Key Lab Photochem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
3.Aalborg Univ, Dept Chem & Biosci, Fredrik Bajers Vej 7H, DK-9220 Aalborg, Denmark
4.Sino Danish Ctr Educ & Res SDC, Niels Jenses Vej 2, DK-8000 Aarhus, Denmark
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