Enhanced Performance and Stability of Polymer BHJ Photovoltaic Devices from Dry Transfer of PEDOT:PSS

Authors

  • Jung Kyu Kim,

    1. SKKU Advanced Institute of Nanotechnology (SAINT) and School of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746 (Republic of Korea)
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  • Dr. Insun Park,

    1. Samsung Advanced Institute of Technology, Samsung Electronics, Yongin, 446-712 (Republic of Korea)
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  • Wanjung Kim,

    1. SKKU Advanced Institute of Nanotechnology (SAINT) and School of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746 (Republic of Korea)
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  • Prof. Dong Hwan Wang,

    1. School of Integrative Engineering, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756 (Republic of Korea)
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  • Dr. Dae-Geun Choi,

    1. Department of Nano Manufacturing Technology, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials, 104, Jang-dong, Yuseong-gu, Daejeon 305-343 (Republic of Korea)
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  • Dr. Yeong Suk Choi,

    Corresponding author
    1. Samsung Advanced Institute of Technology, Samsung Electronics, Yongin, 446-712 (Republic of Korea)
    • Yeong Suk Choi, Samsung Advanced Institute of Technology, Samsung Electronics, Yongin, 446-712 (Republic of Korea)===

      Jong Hyeok Park, SKKU Advanced Institute of Nanotechnology (SAINT) and School of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746 (Republic of Korea)===

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  • Prof. Jong Hyeok Park

    Corresponding author
    1. SKKU Advanced Institute of Nanotechnology (SAINT) and School of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746 (Republic of Korea)
    • Yeong Suk Choi, Samsung Advanced Institute of Technology, Samsung Electronics, Yongin, 446-712 (Republic of Korea)===

      Jong Hyeok Park, SKKU Advanced Institute of Nanotechnology (SAINT) and School of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746 (Republic of Korea)===

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Abstract

Polymer solar cells with enhanced initial cell performances and long-term stability were fabricated by performing a simple dry transfer of a hole extraction layer [poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)] onto an indium tin oxide (ITO) substrate. Due to the very flat surface of the polyurethane acrylate/polycarbonate (PUA/PC) film, which was used as a mold and resembled the surface of the original substrate (silicon wafer), the transferred layer had a very smooth surface morphology, resulting in enhancement of the interfacial characteristics. The work function of the PEDOT:PSS layer and the morphology of bulk hetero junction (BHJ) layer were tuned by controlling the position of PSS enrichment in the PEDOT:PSS layer using the dry transfer. The power conversion efficiency of PTB7:PC71BM BHJ device prepared by the dry transfer was 8.06 %, which was significantly higher than that of the spin-cast device (7.32 %). By avoiding direct contact between the ITO substrate and the PEDOT:PSS solution in the dry transfer system, etching and diffusion of indium in the ITO substrate were greatly reduced, thereby improving the stability.

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