Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.417
Publication date: 16th December 2024
In this talk we set out to explain the physics that gives rise to two surprising phenomena that are frequently observed in perovskite solar cells, namely inverted hysteresis (IH) and the appearance of a third (intermediate frequency) feature in PSC impedance plots. Both these phenomena are caused by the leakage of charge carriers from one of the transport layers into the perovskite in sufficient numbers that they are able to partially screen electric fields in the interior of the perovskite layer. In order to better understand these phenomena, we analyze the standard drift-diffusion model of a planar three-layer PSC, using asymptotic techniques, to derive a reduced order model capable of describing the screening effects in the perovskite layers arising both from the presence of ions (which redistribute slowly) and from that of charge carriers (which adjust almost instantaneously). This approximate reduced order model shows excellent agreement with numerical simulations to the full drift-diffusion model and provides fundamental insights into the causes of inverted hysteresis reconciling the alternative explanations of this phenomenon found in the literature. Furthermore it can be used to explain the appearance of the third (intermediate frequency) feature in PSC impedance plots. Understanding why these atypical phenoneman occur is important for the device physicist because their appearance can be used to diagnose certain properties of the cell.
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