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Electron-Rich Anthracene Semiconductors Containing Triarylamine for Solution-Processed Small-Molecule Organic Solar Cells

Authors

  • Hyeju Choi,

    1. Department of New Materials Chemistry, Korea University, Chungnam, 330-700 (South Korea), Fax: (+82) 44-860-1331
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  • Haye Min Ko,

    1. Department of New Materials Chemistry, Korea University, Chungnam, 330-700 (South Korea), Fax: (+82) 44-860-1331
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  • Nara Cho,

    1. Department of New Materials Chemistry, Korea University, Chungnam, 330-700 (South Korea), Fax: (+82) 44-860-1331
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  • Prof. Kihyung Song,

    1. Department of Chemical Education, Korea National University of Education, Chungbuk, 333-791 (South Korea)
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  • Prof. Jae Kwan Lee,

    Corresponding author
    1. Department of Chemistry Education, Chosun University, Gwangju, 501-759 (South Korea), Fax: (+82) 62-230-7319
    • Department of Chemistry Education, Chosun University, Gwangju, 501-759 (South Korea), Fax: (+82) 62-230-7319
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  • Prof. Jaejung Ko

    Corresponding author
    1. Department of New Materials Chemistry, Korea University, Chungnam, 330-700 (South Korea), Fax: (+82) 44-860-1331
    • Department of New Materials Chemistry, Korea University, Chungnam, 330-700 (South Korea), Fax: (+82) 44-860-1331
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Abstract

New electron-rich anthracene derivatives containing triarylamine hole stabilizers, 2,6-bis[5,5′-bis(N,N′-diphenylaniline)-2,2′-bithiophen-5-yl]-9,10-bis-[(triisopropylsilyl)ethynyl]anthracene (TIPSAntBT–TPA) and 2,6-bis(5,5′-bis{4-[bis(9,9-dimethyl-9H-fluoren-2-yl)amino]phenyl}-2,2′-bithiophen-5-yl)-9,10-bis-[(triisopropylsilyl)ethynyl]anthracene (TIPSAntBT–bisDMFA), linked with π-conjugated bithiophene bridges, were synthesized and their photovoltaic characteristics were investigated in solution-processed small-molecule organic solar cells (SMOSCs). These new materials exhibited superior intramolecular charge transfer from triarylamine to anthracene, leading to a more electron-rich anthracene core that facilitated electron transfer into phenyl-C61-butyric acid methyl ester. Compared with TIPSAntBT and triarylamine, these materials show a threefold improvement in hole-transporting properties and better photovoltaic performance in solution-processed SMOSCs, with the best power conversion efficiency being 2.96 % at a high open-circuit voltage of 0.85 V.

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