Giant dimeric donors for all-giant-oligomer organic solar cells with efficiency over 16% and superior photostability

Caixuan Wang, Xiaoming Ma, Dan Deng (), Hao Zhang, Rui Sun, Jianqi Zhang, Lili Zhang, Mengying Wu, Jie Min, Zhi-Guo Zhang () and Zhixiang Wei ()
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Caixuan Wang: National Center for Nanoscience and Technology
Xiaoming Ma: National Center for Nanoscience and Technology
Dan Deng: National Center for Nanoscience and Technology
Hao Zhang: National Center for Nanoscience and Technology
Rui Sun: Wuhan University
Jianqi Zhang: National Center for Nanoscience and Technology
Lili Zhang: National Center for Nanoscience and Technology
Mengying Wu: National Center for Nanoscience and Technology
Jie Min: Wuhan University
Zhi-Guo Zhang: Beijing University of Chemical Technology
Zhixiang Wei: National Center for Nanoscience and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Increasing the molecular weight while maintaining mono-dispersity has been proved crucial in innovating high-performance photovoltaic materials in giant oligomeric acceptors. However, developing efficient giant oligomeric donors to replace the batch-varied polymers remains challenging due to a lack of design principles. Here, by designing two unique isomeric rhodanine-based linkers, we successfully regulate the assembly behaviors of giant dimeric donors (G-Dimer-Ds) and fabricate the first all-giant-oligomer OSCs pairing with giant dimeric acceptor DY. Multiple characterizations demonstrate the small homo-molecular interaction with strong thermal-driven assembly capability in G-Dimer-D2 simultaneously facilitates reducing energetic disorder, improving charge transport and obtaining stable morphology, resulting in a satisfactory efficiency of 15.70% and long-term photostability with an extrapolated T80 of ca.10,000 hours, and further enhancing thermal-driven assembly promotes efficiency of 16.05%. Our results provide construction approaches on efficient giant donors, and propose a promising type of OSC with completely definite structures, high efficiency and superior stability.

Date: 2024
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DOI: 10.1038/s41467-024-52821-5

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