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Large open-circuit voltage polymer solar cells by poly(3-hexylthiophene) with multi-adducts fullerenes

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Abstract

Polymer solar cells (PSCs) made by poly(3-hexylthiophene) (P3HT) with multi-adducts fullerenes, [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM), PC61BM-bisadduct (bisPC61BM) and PC61BM-trisadduct (trisPC61BM), were reported. Electrochemistry studies indicated that PC61BM, bisPC61BM and trisPC61BM had step-up distributional lowest unoccupied molecular orbital (LUMO) energy. PSCs made by P3HT with above PC61BMs show a trend of enlarged open-circuit voltages, which is in good agreement with the energy difference between the LUMO of PC61BMs and the HOMO of P3HT. On the contrary, reduced short-circuit currents (J sc) were observed. The investigation of photo responsibility, dynamics analysis based on photo-induced absorption of composite films, P3HT:PC61BMs and n-channel thin film field-effect transistors of PC61BMs suggested that the short polaron lifetimes and low carrier mobilities were response for reduced J sc. All these results demonstrated that it was important to develop an electron acceptor which has both high carrier mobility, and good compatibility with the electron donor conjugated polymer for approaching high performance PSCs.

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Authors and Affiliations

  1. Department of Polymer Engineering, College of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-0301, USA

    Xiong Gong & TianZhi Yu

  2. State Key Laboratory of Luminescence Physics and Chemistry, South China University of Technology, Guangzhou, 510641, China

    Yong Cao

  3. Department of Physics, University of California, Santa Barbara, USA

    Alan J. Heeger

Authors
  1. Xiong Gong
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  2. TianZhi Yu
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  3. Yong Cao
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  4. Alan J. Heeger
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Correspondence to Xiong Gong.

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Gong, X., Yu, T., Cao, Y. et al. Large open-circuit voltage polymer solar cells by poly(3-hexylthiophene) with multi-adducts fullerenes. Sci. China Chem. 55, 743–748 (2012). https://doi.org/10.1007/s11426-012-4505-1

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  • DOI: https://doi.org/10.1007/s11426-012-4505-1

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