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

Firouzeh Ebadi, Nima Taghavinia (), Raheleh Mohammadpour, Anders Hagfeldt and Wolfgang Tress ()
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Firouzeh Ebadi: École Polytechnique Fédérale de Lausanne, Laboratory of Photomolecular Science
Nima Taghavinia: 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

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-09079-z

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