Publication date: 21st July 2025
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. On the flip side, the ions can act as probes, giving us useful information about how well a cell is operating.
One technique we have used is impedance spectroscopy, a very common characterisation technique. 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. The low frequency regime contains 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. This presentation will cover our recent work measuring and modelling a wide variety of perovskite solar cells (PSCs) and using ion migration to diagnose device physics.
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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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The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.