|Publication type:||Conference other|
|Type of review:||Peer review (abstract)|
|Title:||Negative capacitance in perovskite solar cells|
Ebadi Garjan, Firouzeh
|Conference details:||37th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Online, 7-11 September 2020|
|Subjects:||Perovskite solar cells; Negative Capacitance|
|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.|
|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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