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Semi-Transparent Tandem Organic Solar Cells with 90% Internal Quantum Efficiency

Authors

  • Zheng Tang,

    Corresponding author
    1. Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden
    • Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden.
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  • Zandra George,

    1. Polymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
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  • Zaifei Ma,

    1. Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden
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  • Jonas Bergqvist,

    1. Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden
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  • Kristofer Tvingstedt,

    1. Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden
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  • Koen Vandewal,

    1. Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden
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  • Ergang Wang,

    1. Polymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
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  • L. Mattias Andersson,

    1. Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden
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  • Mats R. Andersson,

    1. Polymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
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  • Fengling Zhang,

    1. Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden
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  • Olle Inganäs

    Corresponding author
    1. Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden
    • Biomolecular and Organic Electronics, IFM, and Center of Organic Electronics, Linköping University, SE-581 83 Linköping, Sweden.
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Abstract

Semi-transparent (ST) organic solar cells with potential application as power generating windows are studied. The main challenge is to find proper transparent electrodes with desired electrical and optical properties. In this work, this is addressed by employing an amphiphilic conjugated polymer PFPA-1 modified ITO coated glass substrate as the ohmic electron-collecting cathode and PEDOT:PSS PH1000 as the hole-collecting anode. For active layers based on different donor polymers, considerably lower reflection and parasitic absorption are found in the ST solar cells as compared to solar cells in the standard geometry with an ITO/PEDOT:PSS anode and a LiF/Al cathode. The ST solar cells have remarkably high internal quantum efficiency at short circuit condition (∼90%) and high transmittance (∼50%). Hence, efficient ST tandem solar cells with enhanced power conversion efficiency (PCE) compared to a single ST solar cell can be constructed by connecting the stacked two ST sub-cells in parallel. The total loss of photons by reflection, parasitic absorption and transmission in the ST tandem solar cell can be smaller than the loss in a standard solar cell based on the same active materials. We demonstrate this by stacking five separately prepared ST cells on top of each other, to obtain a higher photocurrent than in an optimized standard solar cell.

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