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Inverted polymer fullerene solar cells exceeding 10% efficiency with poly(2-ethyl-2-oxazoline) nanodots on electron-collecting buffer layers

Author

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  • Sungho Nam

    (Organic Nanoelectronics Laboratory, School of Applied Chemical Engineering, Kyungpook National University
    Blackett Laboratory, Imperial College London)

  • Jooyeok Seo

    (Organic Nanoelectronics Laboratory, School of Applied Chemical Engineering, Kyungpook National University)

  • Sungho Woo

    (Daegu Gyeongbuk Institute of Science and Technology)

  • Wook Hyun Kim

    (Daegu Gyeongbuk Institute of Science and Technology)

  • Hwajeong Kim

    (Organic Nanoelectronics Laboratory, School of Applied Chemical Engineering, Kyungpook National University
    Research Institute of Advanced Energy Technology, Kyungpook National University)

  • Donal D. C. Bradley

    (Blackett Laboratory, Imperial College London
    Physical and Life Sciences, University of Oxford)

  • Youngkyoo Kim

    (Organic Nanoelectronics Laboratory, School of Applied Chemical Engineering, Kyungpook National University)

Abstract

Polymer solar cells have been spotlighted due to their potential for low-cost manufacturing but their efficiency is still less than required for commercial application as lightweight/flexible modules. Forming a dipole layer at the electron-collecting interface has been suggested as one of the more attractive approaches for efficiency enhancement. However, only a few dipole layer material types have been reported so far, including only one non-ionic (charge neutral) polymer. Here we show that a further neutral polymer, namely poly(2-ethyl-2-oxazoline) (PEOz) can be successfully used as a dipole layer. Inclusion of a PEOz layer, in particular with a nanodot morphology, increases the effective work function at the electron-collecting interface within inverted solar cells and thermal annealing of PEOz layer leads to a state-of-the-art 10.74% efficiency for single-stack bulk heterojunction blend structures comprising poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene-alt-3-fluorothieno[3,4-b]thiophene-2-carboxylate] as donor and [6,6]-phenyl-C71-butyric acid methyl ester as acceptor.

Suggested Citation

  • Sungho Nam & Jooyeok Seo & Sungho Woo & Wook Hyun Kim & Hwajeong Kim & Donal D. C. Bradley & Youngkyoo Kim, 2015. "Inverted polymer fullerene solar cells exceeding 10% efficiency with poly(2-ethyl-2-oxazoline) nanodots on electron-collecting buffer layers," Nature Communications, Nature, vol. 6(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9929
    DOI: 10.1038/ncomms9929
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    Cited by:

    1. Myeonghun Song & Sooyong Lee & Dohan Kim & Chulyeon Lee & Jaehoon Jeong & Jooyeok Seo & Hwajeong Kim & Dong-Ik Song & Donghyun Kim & Youngkyoo Kim, 2017. "Charging Characteristics of Lithium Ion Battery Using Semi-Solar Modules of Polymer:Fullerene Solar Cells," Energies, MDPI, vol. 10(11), pages 1-10, November.
    2. Rafique, Saqib & Abdullah, Shahino Mah & Sulaiman, Khaulah & Iwamoto, Mitsumasa, 2018. "Fundamentals of bulk heterojunction organic solar cells: An overview of stability/degradation issues and strategies for improvement," Renewable and Sustainable Energy Reviews, Elsevier, vol. 84(C), pages 43-53.

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