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Issue 30, 2016
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Impact of the alkyl side chain position on the photovoltaic properties of solution-processable organic molecule donor materials

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Abstract

Two new A–D–A structured organic molecules with bithienyl-substituted benzodithiophene (BDT) as the core and donor unit, indenedione (ID) as the end group and acceptor unit, 3,3′′-dihexyl-2,2′:5′,2′′-terthiophene (3T(3-Hex)) or 4,4′′-dihexyl-2,2′:5′,2′′-terthiophene (3T(4-Hex)) as the π bridge, BDT-3T(3-Hex)-ID and BDT-3T(4-Hex)-ID, were designed and synthesized. The two compounds with the alkyl side chains at different positions in the π bridge backbone which are applied in solution-processable organic solar cells (OSCs) as donor materials have the same molecular weight and a similar structure, but exhibit different optical and photovoltaic properties. The BDT-3T(4-Hex)-ID film shows a broad absorption band from 400 nm to 750 nm with an absorption peak about 20 nm red-shifted compared to that of BDT-3T(3-Hex)-ID in solution, benefitting from the outward alkyl side chain in its structure. The power conversion efficiency (PCE) of the solution-processed OSC based on a blend of BDT-3T(4-Hex)-ID and PC71BM (1.25 : 1, w/w) reached 6.55% with a Jsc of 10.54 mA cm−2, a Voc of 0.87 V and a FF of 71.4%, under the illumination of AM 1.5, 100 mW cm−2. In comparison, the PCE of the OSC based on BDT-3T(3-Hex)-ID as the donor is 1.06% under the same experimental conditions.

Graphical abstract: Impact of the alkyl side chain position on the photovoltaic properties of solution-processable organic molecule donor materials

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Publication details

The article was received on 03 May 2016, accepted on 25 Jun 2016 and first published on 27 Jun 2016


Article type: Paper
DOI: 10.1039/C6TA03695C
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J. Mater. Chem. A, 2016,4, 11747-11753

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    Impact of the alkyl side chain position on the photovoltaic properties of solution-processable organic molecule donor materials

    J. Zhang, X. W. Zhu, C. He, H. J. Bin, L. W. Xue, W. G. Wang, Y. K. Yang, N. Y. Yuan, J. N. Ding, Z. X. Wei, Z.-G. Zhang and Y. F. Li, J. Mater. Chem. A, 2016, 4, 11747
    DOI: 10.1039/C6TA03695C

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