| 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): | 621.3: Electrical, communications, control engineering |
| 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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Tress, W., & Ebadi Garjan, F. (2020, September 8). Negative capacitance in perovskite solar cells. 37th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Online, 7-11 September 2020.
Tress, W. and Ebadi Garjan, F. (2020) ‘Negative capacitance in perovskite solar cells’, in 37th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Online, 7-11 September 2020.
W. Tress and F. Ebadi Garjan, “Negative capacitance in perovskite solar cells,” in 37th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Online, 7-11 September 2020, Sep. 2020.
TRESS, Wolfgang und Firouzeh EBADI GARJAN, 2020. Negative capacitance in perovskite solar cells. In: 37th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Online, 7-11 September 2020. Conference presentation. 8 September 2020
Tress, Wolfgang, and Firouzeh Ebadi Garjan. 2020. “Negative Capacitance in Perovskite Solar Cells.” Conference presentation. In 37th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Online, 7-11 September 2020.
Tress, Wolfgang, and Firouzeh Ebadi Garjan. “Negative Capacitance in Perovskite Solar Cells.” 37th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Online, 7-11 September 2020, 2020.
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