Publication date: 17th February 2025
This presentation will cover our recent work measuring and modelling the impedance spectra of a wide variety of perovskite solar cells (PSCs); and introduce the wealth of information that can be obtained from the mid- and low- frequency impedance response. The low frequency impedance response gives insight into which part of a fully operational device is limiting cell efficiency [1]; and our recent modelling suggests that the mid-frequency response may be able to rapidly predict the long-term stability of perovskite solar cells; saving time by suggesting which cells to submit for long term testing [2].
The dual electronic-ionic nature of perovskite solar cells has complicated the interpretation of almost all the standard PV characterisation techniques. For example, when ions move on the timescale of current-voltage measurements, they can act to modify carrier recombination rates and carrier extraction, influencing the shape of the response. Ions can also modify fast measurements, where the ‘frozen in’ ion distribution impacts the electronic response of the device [3]. Impedance spectroscopy is a common characterisation technique used to probe the physics of the device on different timescales. The Nyquist plots measured for PSCs show a wide variety of different shapes, and many different interpretations of these spectra can be found in the literature. We recently showed that all of these experimentally observed shapes can be reproduced by a standard three layer drift diffusion model with a single mobile ion species, without the need to invoke any exotic physics within the device [2]. Furthermore, we show that the low- and mid-frequency responses convey a wealth of information about the internal workings of the cell that can be obtained purely from shape recognition of the Nyquist plot without any modelling expertise. More recently we have looked at the effect of cell degradation (in the form of an increasing recombination rate) on the impedance spectrum, and the results suggest that impedance is a powerful tool for rapidly predicting the long term stability of perovskite solar cells.
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International Conference on Hybrid and Organic Photovoltaics
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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