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Benzothiadiazole-oligothiophene flanked dicyanomethylenated quinacridone for non-fullerene acceptors in polymer solar cells

Abstract

A new class of benzothiadiazole-oligo(3-hexylthiophene) flanked dicyanomethylenated quinacridone derivatives DCNQA-BT-Tn (n = 1-3) have been designed and synthesized in good yeild by iterative bromination and Suzuki coupling reaction, followed by Knoevenagel condensation. The photophysical and electrochemical properties of the compounds have been fully investigated. They showed intense and broad absorption at visible and near-infrared regions, suitable LUMO energy level at about -3.7 eV, and appropriate film-formation properties. The bulk heterojunction (BHJ) photovaltaic devices based on the blend film of P3HT/DCNQA-BT-T1 (P3HT = poly(3-hexylthiophene)) showed a power conversion efficiency (PCE) of 0.73% under the AM.1.5, 100 mW cm-2 irradiation. Compared with the traditional P3HT/PC61BM (PC61BM = [6,6]-phenyl-C61-butyric acid methyl ester) device, P3HT/DCNQA-BT-T1 device displayed intense absorption in the near-infrared region (650–750 nm) and effectively contribute to the photocurrent. These results indicate that DCNQA derivatives are promising non-fullerenes acceptors for BHJ polymer solar cells.

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Publication details

The article was received on 08 Jan 2018, accepted on 15 Feb 2018 and first published on 15 Feb 2018


Article type: Paper
DOI: 10.1039/C8NJ00102B
Citation: New J. Chem., 2018, Accepted Manuscript
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    Benzothiadiazole-oligothiophene flanked dicyanomethylenated quinacridone for non-fullerene acceptors in polymer solar cells

    J. Su, W. Chen, X. Wen, Y. Miao, F. Li and Y. Wang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00102B

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