Anomalous Behaviors of Graphene Transparent Conductors in Graphene–Silicon Heterojunction Solar Cells

Authors

  • Xinming Li,

    1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
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  • Dan Xie,

    1. Tsinghua National Laboratory for Information, Science and Technology (TNList), Institute of Microelectronics, Tsinghua University, Beijing 100084, P. R. China
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  • Hyesung Park,

    1. Department of Electrical Engineering and Computer Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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  • Tingying Helen Zeng,

    1. Center for Excitonics, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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  • Kunlin Wang,

    1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
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  • Jinquan Wei,

    1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
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  • Minlin Zhong,

    1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
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  • Dehai Wu,

    1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
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  • Jing Kong,

    1. Department of Electrical Engineering and Computer Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
    2. Center for Excitonics, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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  • Hongwei Zhu

    Corresponding author
    1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
    2. Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, P. R. China
    • School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.
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Abstract

original image

An unexpected behavior of graphene in graphene–silicon heterojunction junction solar cells when it is used as the window electrode is reported. Although the synthesized mono layer graphene exhibits better transparency and conductivity, the multilayer graphene enables much higher solar conversion ability of the solar cell. This surprising observation may be because the multilayer graphene can more effectively suppress charge recombination at the heterojunction interface, which increases the fill factor and enhances the cell performance.

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