Publication date: 17th February 2025
The study of perovskite solar cells degradation is a complex issue due to the multitude of phenomena that can contribute to it. Normally the degradation can produce two main impacts, decrease of charge collection (lowering photocurrent) or increase of recombination (lowering photovoltage). We need to find dynamical signatures of the phenomena causing these effects to discover the physical reasons for the devaluated performance. Recently, we have obtained new insights using a model that combines several electronic and ionic processes, that can produce capacitive and inductive response in different circumstances.1 These models are very successful to describe huge memory effects and hysteresis in perovskite memristors, by the combination of different techniques: current-voltage scan, time transients, and impedance spectroscopy.2-4 Here we show the changes of impedance spectroscopy and time transients as a diagnosis of evolution of degradation in the perovskite solar cells. We discuss the capacitive and inductive effects that contribute to increased recombination and reduced charge collection.
We thank Grant EUR2022-134045 funded by MICIU/AEI /10.13039/501100011033 and by European Union NextGenerationEU/ PRTR
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