Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO26)
Publication date: 22nd April 2026
Perovskite solar cells have reached high power-conversion efficiencies, yet their instability under operating and storage conditions remains a major obstacle to deployment [1,2]. In particular, device evolution is often non-monotonic, and recovery effects can complicate the interpretation of ageing experiments. Understanding how electrical performance changes under dark and light conditions relate to underlying physical processes is therefore essential.
In this work, we combine repeated current-voltage characterization with physics-based device simulation to investigate the evolution of perovskite solar cells during light and dark aging. A one-dimensional optoelectronic model is used together with a genetic-algorithm-based fitting strategy, allowing us to identify families of parameter sets consistent with the experimental device response rather than relying on a single fitted solution. This provides a broader basis for interpreting which parameter trends are robustly supported by the data.
Our preliminary results reveal reproducible non-monotonic behaviour across cells, with distinct evolution regimes observed during degradation and subsequent dark storage. The degraded state is most consistently associated with changes affecting charge-transport-related terms, while post-stress dark storage remains dynamic and can lead to partial recovery of photovoltaic performance. These observations highlight that perovskite solar cell behaviour cannot be understood from illuminated operation alone, and that dark evolution must also be considered when analysing stability.
Overall, this coupled experimental-modelling approach provides a practical framework for comparing device evolution under different conditions and for identifying the parameter trends that are most relevant to ageing and recovery in perovskite solar cells.
This work was carried out within the Institut Photovoltaïque d’Île-de-France (IPVF). The authors acknowledge support from the French Government under the Programme d’Investissements d’Avenir (ANR-IEED-002-01). We also thank our colleagues at IPVF, for the fabrication and characterization of the simulated devices, and the fruitful discussions and technical assistance during experiments and simulations.
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