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Origin of apparent light-enhanced and negative capacitance in perovskite solar cells

Author

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  • Firouzeh Ebadi

    (École Polytechnique Fédérale de Lausanne, Laboratory of Photomolecular Science
    Sharif University of Technology)

  • Nima Taghavinia

    (Sharif University of Technology
    Sharif University of Technology)

  • Raheleh Mohammadpour

    (Sharif University of Technology)

  • Anders Hagfeldt

    (École Polytechnique Fédérale de Lausanne, Laboratory of Photomolecular Science)

  • Wolfgang Tress

    (École Polytechnique Fédérale de Lausanne, Laboratory of Photomolecular Science)

Abstract

So-called negative capacitance seems to remain an obscure feature in the analysis of the frequency-dependent impedance of perovskite solar cells. It belongs to one of the puzzling peculiarities arising from the mixed ionic-electronic conductivity of this class of semiconductor. Here we show that apparently high capacitances in general (positive and negative) are not related to any capacitive feature in the sense of a corresponding charge accumulation. Instead, they are a natural consequence of slow transients mainly in forward current of the diode upon ion displacement when changing voltage. The transient current leads to a positive or negative ‘capacitance’ dependent on the sign of its gradient. The ‘capacitance’ appears so large because the associated resistance, when thinking of a resistor-capacitor element, results from another physical process, namely modified electronic charge injection and transport. Observable for a variety of devices, it is a rather universal phenomenon related to the hysteresis in the current–voltage curve.

Suggested Citation

  • Firouzeh Ebadi & Nima Taghavinia & Raheleh Mohammadpour & Anders Hagfeldt & Wolfgang Tress, 2019. "Origin of apparent light-enhanced and negative capacitance in perovskite solar cells," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09079-z
    DOI: 10.1038/s41467-019-09079-z
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    Cited by:

    1. Hernández-Balaguera, Enrique, 2023. "Fractional model of the chemical inductor," Chaos, Solitons & Fractals, Elsevier, vol. 172(C).

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