Publication date: 15th December 2025
Organic photovoltaics (OPVs) are attracting growing attention as lightweight, flexible, and solution-processable solar energy technologies. However, the morphological instability of the bulk-heterojunction (BHJ) active layer remains a critical challenge to their long-term operational stability. In this study, we systematically investigate the phase evolution resistance of high-performance OPV active layers to reveal the intrinsic factors governing thermal and morphological robustness. Through combined molecular design, in situ structural characterization, and device analysis, we correlate donor–acceptor miscibility and interfacial energy with the dynamic evolution of nanoscale morphology. Further analysis show that the extent of molecular rearrangement under thermal stress strongly influences charge transport and device stability. Note that the active layers includes polymer donor:small moleucle acceptor systems, all-polymer systems and all-small molecule systems. This work provides mechanistic insights and design principles for developing next-generation OPV materials with enhanced phase stability and extended operational lifetimes.
This work was financially supported by the National Natural Science Foundation of China (NSFC) (Grant No. 22279094, No. 223B2904 and No. 22409149), Hubei Provincial Natural Science Foundation (2024AFB068), and the Fundamental Research Funds for the Central Universities. This work was supported by the Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology, 2024-skllmd-23) and the opening project of the Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for the Petroleum and Chemical Industry of China (2024A051).
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