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Polymer Bulk Heterojunction Solar Cells with PEDOT:PSS Bilayer Structure as Hole Extraction Layer

Authors

  • Wanjung Kim,

    1. School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
    2. SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
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    • These authors are equally contributed to this work.

  • Namhun Kim,

    1. School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
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    • These authors are equally contributed to this work.

  • Jung Kyu Kim,

    1. SKKU Advanced Institute of Nanotechnology (SAINT), 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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  • Dr. Yeong Suk Choi,

    1. Samsung Advanced Institute of Technology, Samsung Electronics, Yongin 446-712 (Republic of Korea)
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  • Dr. Dong Hwan Wang,

    1. SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
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  • Prof. Heeyeop Chae,

    Corresponding author
    1. School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
    2. SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
    • School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
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  • Prof. Jong Hyeok Park

    Corresponding author
    1. School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
    2. SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
    • School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
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Abstract

A high current density obtained in a limited, nanometer-thick region is important for high efficiency polymer solar cells (PSCs). The conversion of incident photons to charge carriers only occurs in confined active layers; therefore, charge-carrier extraction from the active layer within the device by using solar light has an important impact on the current density and the related to power conversion efficiency. In this study, we observed a surprising result, that is, extracting the charge carrier generated in the active layer of a PSC device, with a thickness-controlled PEDOT:PSS bilayer that acted as a hole extraction layer (HEL), yielded a dramatically improved power conversion efficiency in two different model systems (P3HT:PC60BM and PCDTBT:PC70BM). To understand this phenomenon, we conducted optical strength simulation, photocurrent–voltage measurements, incident photon to charge carrier efficiency measurements, ultraviolet photoelectron spectroscopy, and AFM studies. The results revealed that approximately 60 nm was the optimum PEDOT:PSS bilayer HEL thickness in PSCs for producing the maximum power conversion efficiency.

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