Inductive Loop and Negative Capacitance in Perovskite Solar Cells, not Just an Exotic Behavior
Iván Mora-Seró a
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
València, Spain, 2017 March 1st - 2nd
Organizers: Henk Bolink and David Cahen
Oral, Iván Mora-Seró, presentation 064
Publication date: 18th December 2016

Perovskite solar cells are surprising the photovoltaic community as unconventional behaviors have been reported. In most of the cases the origin of these behaviors is not completely understood and also, very important for the final application, how them influence the final performance of the device. Hysteresis, preconditioning effect or large low frequency capacitances have received high attention but other phenomena as inductive loops and/or negative capacitance have been studied significantly less, in part, as their implications in the final performance of the device were not clearly established. Here we unambiguously demonstrate a direct correlation between the observation of the negative capacitance and a corresponding decrease on performance of the device, manifested by a reduction of open circuit potential and fill factor. On the other hand we discuss the influence of injection processes, more concretely between TiO2 electron selective contact and perovskite, in the observation of this phenomena. This presentation stress the necessity of establishing the physical origin of negative capacitance in perovskite solar cells due to the important implications in the final performance.

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