Design of electroactive polymers for intrinsically-stretchable polymer solar cells Bumjoon J. Kim Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea Considering the technical standards required for wearable electronics, such as mechanical robustness, the development of fully stretchable OSCs (f-SOSCs) should be accelerated. Concurrently, f-SOSCs offer an intriguing platform for testing the mechanical and electrical properties of new polymeric materials. This presentation will discuss key studies aimed at making each layer of f-SOSCs both stretchable and efficient, with an emphasis on strategies to simultaneously enhance the photovoltaic and mechanical properties of the active layer. I will outline material design strategies to enhance the mechanical robustness of the PSCs as well as their power conversion efficiencies (PCEs). These strategies include; i) incorporating a high-molecular weight polymer acceptor as a tie molecule into active layers, ii) developing new electroactive polymers consisting of hard and soft segments and iii) developing new materials that improve molecular miscibility in the donor-acceptor blends. With these contributions, the f-SOSCs achieving over 14% PCE and excellent stretchability have been developed. References 1. Park, J. S. et al. Adv. Mater. 2022, 34, 2201623
2. Lee, J. W. et al. Energy Environ. Sci. 2021, 14, 4067 3. Lee, J. W. et al. Energy Environ. Sci. 2022, 15, 4672 4. Lee, J. W. et al. Adv. Mater. 2022, 34, 2207544 5. Seo, S. et al. Adv. Mater. 2023, 35, 2300230
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