Publication date: 15th December 2025
Organic solar cells offer great promises for lightweight and flexible energy-harvesting technologies. Yet, ensuring their long-term stability under thermal stress continues to pose a critical challenge, especially for large-scale and practical deployment. Elevated temperatures typically alter the nanoscale morphology of the photoactive layer, resulting in notable performance degradation over time. Interestingly, under certain thermal conditions, these morphological changes can be reversed, which opens up new possibilities for device recovery and future innovation. In this study, P3HT:PCBM based devices have been exposed to extreme thermal stress at temperatures of up to 250°C that initially caused full performance decay. Upon controlled cooling, the devices recovered and regained a fraction of their original efficiency, which agrees with a simple 2-phase regime behaviour. The recovery of the solar cell devices is also reflected in photoluminescence spectroscopy, supporting the hypothesis of reversible phase separation within the active blend. These findings highlight new design opportunities for enhancing both the thermal resilience and commercial potential of future organic solar cell generations.
J.M.P and H.H. is grateful for financial support from the Deutsche Forschungsgemeinschaft (DFG) via the DFG project number 455748945
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