Understanding Transient Capacitance Measurements of Perovskite Solar Cells Using Drift-Diffusion Simulations
Moritz C. Schmidt a, Lucie Mc Govern a, Bruno Ehrler a
a Center for Nanophotonics, AMOLF, Science Park, 104, Amsterdam, Netherlands
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Poster, Moritz C. Schmidt, 272
Publication date: 20th April 2022

In recent years, capacitive transient measurements like deep-level transient spectroscopy (DLTS) and transient ion-drift (TID) have been successfully applied to perovskite solar cells to quantify their defect and ion landscape. In multiple studies, the perovskite is assumed to be p-doped, while the mobile ion density is determined to be orders of magnitudes lower than the doping density [1, 2]. Because of the ongoing debate about the doping and mobile ion density in perovskites, it is necessary to evaluate their influence on transient capacitance measurements. In this work, we carry out drift-diffusion simulations of capacitance transients of perovskite solar cells with a wide range of different doping and mobile ion densities to obtain a better understanding of the charge-carrier dynamics during transient capacitance measurements. The simulations suggest that the direction of the capacitance transients is mainly influenced by the formation of a depletion layer within the perovskite and thus the doping density.

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