Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
The ‘standard’ impedance spectrum of a perovskite solar cell exhibits two distinct semicircles, the origins of which have been well explained by models of mixed ionic-electronic conduction. Some spectra, however, show additional features, ranging from loops and bulges to an elusive third feature appearing at frequencies between those of the two standard features. The origins of these features have been hotly debated. Possible explanations put forward in the literature range from experimental anomalies to exotic additions to the charge transport model. We show, however, that these exotic features are in fact predicted by the widely accepted model of mixed electronic-ionic conduction in a three-layer planar device without the need for any additions. Furthermore, an asymptotic analysis of the underlying model is used to isolate the relevant material parameters and identify the origin as an ionic response to large carrier densities in the perovskite bulk, caused by an insufficient band offset between the perovskite and one of the charge transport layers. This model is used to recreate and explain a variety of exotic impedance spectra seen in the literature.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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