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Organic Sensitizers Featuring a Planar Indeno[1,2-b]-thiophene for Efficient Dye-Sensitized Solar Cells

Authors

  • Kimin Lim,

    1. Photovoltaic Materials, Department of Material Chemistry, Korea University 2511 Sejong-Ro, Sejong 339-700 (South Korea), Fax: (+82) 44-867-5396
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    • These authors contributed equally to this work.

  • Dr. Myung Jong Ju,

    1. Global GET-Future Laboratory, Department of Materials Chemistry, Korea University, 2511 Sejong-Ro, Sejong 339-700 (South Korea)
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    • These authors contributed equally to this work.

  • Juman Song,

    1. Photovoltaic Materials, Department of Material Chemistry, Korea University 2511 Sejong-Ro, Sejong 339-700 (South Korea), Fax: (+82) 44-867-5396
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  • In Taek Choi,

    1. Global GET-Future Laboratory, Department of Materials Chemistry, Korea University, 2511 Sejong-Ro, Sejong 339-700 (South Korea)
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  • Kwangsuk Do,

    1. Photovoltaic Materials, Department of Material Chemistry, Korea University 2511 Sejong-Ro, Sejong 339-700 (South Korea), Fax: (+82) 44-867-5396
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  • Hyeju Choi,

    1. Photovoltaic Materials, Department of Material Chemistry, Korea University 2511 Sejong-Ro, Sejong 339-700 (South Korea), Fax: (+82) 44-867-5396
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  • Prof. Kihyung Song,

    1. Department of Chemistry, Korea National University of Education, Cheongwon, Chungbuk 363-791 (South Korea)
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  • Prof. Hwan Kyu Kim,

    1. Global GET-Future Laboratory, Department of Materials Chemistry, Korea University, 2511 Sejong-Ro, Sejong 339-700 (South Korea)
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  • Prof. Jaejung Ko

    Corresponding author
    1. Photovoltaic Materials, Department of Material Chemistry, Korea University 2511 Sejong-Ro, Sejong 339-700 (South Korea), Fax: (+82) 44-867-5396
    • Photovoltaic Materials, Department of Material Chemistry, Korea University 2511 Sejong-Ro, Sejong 339-700 (South Korea), Fax: (+82) 44-867-5396

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Abstract

An efficient organic sensitizer (JK-306) featuring a planar indeno[1,2-b]thiophene as the π-linker of a bridging unit for dye-sensitized solar cells (DSSCs) was synthesized. The sensitizer had a strong molar absorption coefficient and a red-shifted absorption band compared with JK-305, which resulted in a significant increase in the short-circuit photocurrent density. We incorporated a highly congested bulky amino group into the 2′,4′-dihexyloxybiphenyl-4-yl moiety, an electron donor, to diminish the charge recombination and to prevent aggregation of the sensitizer. Under standard AM 1.5G solar conditions, JK-306-sensitized cells in the presence of co-adsorbents chenodeoxycholic acid (CDCA) and 4-[bis(9,9-dimethyl-9H-fluoren-2-yl)amino]benzoic acid (HC-A), which afforded an overall conversion efficiency of 8.37 % and 8.52 %, respectively. Upon changing the I/I3 electrolyte to the CoII/CoIII redox couple, the cell gave rise to a significantly improved conversion efficiency of 10.02 % with the multifunctional HC-A, which is one of the highest values reported for DSSCs with a cobalt-based electrolyte. Furthermore, the JK-306-based solar cell with a polymer gel electrolyte revealed a high conversion efficiency of 7.61 %, which is one of the highest values for cells based on organic sensitizers.

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