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Stable ultrathin partially oxidized copper film electrode for highly efficient flexible solar cells

Author

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  • Guoqing Zhao

    (Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, School of Materials Science and Engineering, Shandong University
    Korea Institute of Materials Science)

  • Wei Wang

    (Institute of Hybrid Materials, The Growing Base for State Key Laboratory, Qingdao University)

  • Tae-Sung Bae

    (Jeonju Center, Korea Basic Science Institute)

  • Sang-Geul Lee

    (Daegu Center, Korea Basic Science Institute)

  • ChaeWon Mun

    (Korea Institute of Materials Science)

  • Sunghun Lee

    (Korea Institute of Materials Science)

  • Huashun Yu

    (Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, School of Materials Science and Engineering, Shandong University)

  • Gun-Hwan Lee

    (Korea Institute of Materials Science)

  • Myungkwan Song

    (Korea Institute of Materials Science)

  • Jungheum Yun

    (Korea Institute of Materials Science)

Abstract

Advances in flexible optoelectronic devices have led to an increasing need for developing highly efficient, low-cost, flexible transparent conducting electrodes. Copper-based electrodes have been unattainable due to the relatively low optical transmission and poor oxidation resistance of copper. Here, we report the synthesis of a completely continuous, smooth copper ultra-thin film via limited copper oxidation with a trace amount of oxygen. The weakly oxidized copper thin film sandwiched between zinc oxide films exhibits good optoelectrical performance (an average transmittance of 83% over the visible spectral range of 400–800 nm and a sheet resistance of 9 Ω sq−1) and strong oxidation resistance. These values surpass those previously reported for copper-based electrodes; further, the record power conversion efficiency of 7.5% makes it clear that the use of an oxidized copper-based transparent electrode on a polymer substrate can provide an effective solution for the fabrication of flexible organic solar cells.

Suggested Citation

  • Guoqing Zhao & Wei Wang & Tae-Sung Bae & Sang-Geul Lee & ChaeWon Mun & Sunghun Lee & Huashun Yu & Gun-Hwan Lee & Myungkwan Song & Jungheum Yun, 2015. "Stable ultrathin partially oxidized copper film electrode for highly efficient flexible solar cells," Nature Communications, Nature, vol. 6(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9830
    DOI: 10.1038/ncomms9830
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