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Efficiency Enhancement of Polymer Solar Cells Based on Poly(3-hexylthiophene)/Indene-C70 Bisadduct via Methylthiophene Additive

Authors

  • Yeping Sun,

    1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China, Fax: (+86) 10-62559373
    2. Key Laboratory of carbon fiber and functional polymers Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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  • Chaohua Cui,

    1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China, Fax: (+86) 10-62559373
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  • Haiqiao Wang,

    Corresponding author
    1. Key Laboratory of carbon fiber and functional polymers Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
    • Key Laboratory of carbon fiber and functional polymers Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.
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  • Yongfang Li

    Corresponding author
    1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China, Fax: (+86) 10-62559373
    • Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China, Fax: (+86) 10-62559373
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Abstract

Photovoltaic performance of polymer solar cells based on poly(3-hexylthiophene) (P3HT) as the donor and indene-C70 bisadduct (IC70BA) as the acceptor is improved by adding 3 vol% 3-methylthiophene (MT) or 3-hexylthiophene (HT) as processing additives. The results of UV-vis absorption spectroscopy, X-ray diffraction analysis and atomic force microscopy indicate that with the MT or HT processing additive, the active layer of the blend of P3HT/IC70BA showed strengthened absorbance, enhanced crystallinity and improved film morphology. The power conversion efficiency (PCE) of the PSCs was improved from 5.80% for the device without the additive to 6.35% for the device with HT additive and to 6.69% with MT additive. The PCE of 6.69% is the top value reported so far for the PSCs based on P3HT.

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