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Issue 45, 2013
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Solution-processed indacenodithiophene-based small molecule for bulk heterojunction solar cells

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Abstract

A novel small molecule with a acceptor–donor–acceptor (A–D–A) structure, IDT(BTTh2)2, containing an electron-rich indacenodithiophene (IDT) unit as core, flanked by electron-deficient 2,1,3-benzothiadiazole (BT) units and end-capped with hexyl-substituted bithiophene units, has been synthesized for photovoltaic application. IDT(BTTh2)2 shows a broad absorption in the visible range with an optical band gap of ca. 1.80 eV and possesses a relatively deep HOMO level at −5.21 eV. The solution-processed bulk heterojunction solar cells based on the blend of IDT(BTTh2)2/PC71BM (1 : 3, w/w) without using any treatment such as a solvent additive or thermal annealing, showed a power conversion efficiency (PCE) of 4.25% with a high open-circuit voltage (Voc) of 0.93 V, a short-circuit current (Jsc) of 9.42 mA cm−2 and a fill factor (FF) of 48.5%, under the illumination of AM 1.5G at 100 mW cm−2. These results indicate that indacenodithiophene-based small molecules are promising for bulk heterojunction solar cells.

Graphical abstract: Solution-processed indacenodithiophene-based small molecule for bulk heterojunction solar cells

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Publication details

The article was received on 08 Jun 2013, accepted on 05 Sep 2013 and first published on 09 Sep 2013


Article type: Paper
DOI: 10.1039/C3TA12229H
Citation: J. Mater. Chem. A, 2013,1, 14214-14220
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    Solution-processed indacenodithiophene-based small molecule for bulk heterojunction solar cells

    W. Yong, M. Zhang, X. Xin, Z. Li, Y. Wu, X. Guo, Z. Yang and J. Hou, J. Mater. Chem. A, 2013, 1, 14214
    DOI: 10.1039/C3TA12229H

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