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Tuning the Electrical and Optical Properties of Diketopyrrolopyrrole Complexes for Panchromatic Dye-Sensitized Solar Cells

Authors

  • Sanyin Qu,

    1. Key Laboratory for Advanced Materials, Institute of Fine Chemicals and Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China), Fax: (+86) 21-64252758
    2. Photovoltaic Materials Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki (Japan), Fax: (+81) 29-859-2304
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  • Dr. Chuanjiang Qin,

    1. Photovoltaic Materials Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki (Japan), Fax: (+81) 29-859-2304
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  • Dr. Ashraful Islam,

    1. Photovoltaic Materials Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki (Japan), Fax: (+81) 29-859-2304
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  • Prof. Jianli Hua,

    1. Key Laboratory for Advanced Materials, Institute of Fine Chemicals and Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China), Fax: (+86) 21-64252758
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  • Dr. Han Chen,

    1. School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan RD. Minhang District, Shanghai, 200240 (China)
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  • Prof. He Tian,

    Corresponding author
    1. Key Laboratory for Advanced Materials, Institute of Fine Chemicals and Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China), Fax: (+86) 21-64252758
    • He Tian, Key Laboratory for Advanced Materials, Institute of Fine Chemicals and Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China), Fax: (+86) 21-64252758

      Liyuan Han, Photovoltaic Materials Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki (Japan), Fax: (+81) 29-859-2304

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  • Dr. Liyuan Han

    Corresponding author
    1. Photovoltaic Materials Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki (Japan), Fax: (+81) 29-859-2304
    2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dong Chuan RD. Minhang District, Shanghai, 200240 (China)
    • He Tian, Key Laboratory for Advanced Materials, Institute of Fine Chemicals and Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China), Fax: (+86) 21-64252758

      Liyuan Han, Photovoltaic Materials Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki (Japan), Fax: (+81) 29-859-2304

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Abstract

A series of metal-free organic dyes that were bridged by a diketopyrrolopyrrole moiety and were composed of indoline and triphenylamine as donor groups and furan and benzene as conjugated spacer groups were designed and synthesized for use in dye-sensitized solar cells (DSCs). The photophysical properties, electrochemical properties, and performance of the DSCs were related to the structure of their corresponding dyes. Their absorption spectra broadened upon the introduction of the indoline and heterocyclic furan moieties through fine-tuning of their molecular configuration. The overall conversion efficiencies of DSCs that were based on these dyes ranged from 5.14–6.53 %. Among the four dyes that were tested, indoline-based ID01 and ID02 showed higher efficiencies (6.35 % and 6.53 %) as a result of their improved light-harvesting efficiency and larger electron driving force. The ID01 dye, which contained an indoline moiety as an electron donor and a furan group as a π-conjugated linker, showed an excellent monochromatic incident-photon-to-current-conversion efficiency (IPCE) spectrum (350–650 nm) with a maximum value of 78 % in the high plateau region and an onset value close to 800 nm. Intensity-modulated photovoltage spectroscopy (IMVS) and impedance spectroscopy (IS) revealed that dyes that contained benzene conjugation spacers suppressed the charge-recombination rate more efficiently than dyes that contained furan spacers, thereby resulting in improved photovoltage.

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