Negative capacitance in perovskite solar cells

Tress, Wolfgang; Ebadi Garjan, Firouzeh

Publication type:	Conference other
Type of review:	Peer review (abstract)
Title:	Negative capacitance in perovskite solar cells
Authors:	Tress, Wolfgang Ebadi Garjan, Firouzeh
et. al:	No
Conference details:	37th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Online, 7-11 September 2020
Issue Date:	8-Sep-2020
Language:	English
Subjects:	Perovskite solar cells; Negative Capacitance
Subject (DDC):
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 semi- conductor. Here we show that apparently high capacitances in general (positive and nega- tive) 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 phe- nomenon related to the hysteresis in the current–voltage curve.
URI:	https://digitalcollection.zhaw.ch/handle/11475/20472
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Appears in collections:	Publikationen School of Engineering

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