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Ternary blending and copolymerization strategies have proven advantageous in boosting the photovoltaic performance of organic solar cells. Here, 15% efficiency solar cells using copolymerization donors are demonstrated, where the electron-withdrawing unit, ester-substituted thiophene, is incorporated into a PBDB-TF polymer to downshift the molecular energy and broaden the absorption. Copolymer-based solar cells suitable for large-area devices can be fabricated by a blade-coating method from a nonhalogen and nonaromatic solvent mixture. Although ternary solar cells can achieve comparable efficiencies, they are not suitable for environment-friendly processing conditions and show relatively low photostability compared to copolymer-based devices. These results not only demonstrate high-efficiency organic photovoltaic cells via copolymerization strategies but also provide important insights into their applications in practical production.
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Yong Cui
Huifeng Yao
Ling Hong
Advanced Materials
Chinese Academy of Sciences
University of Chinese Academy of Sciences
Beijing National Laboratory for Molecular Sciences
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Cui et al. (Tue,) studied this question.
www.synapsesocial.com/papers/69dd5caf7808b00a4799d082 — DOI: https://doi.org/10.1002/adma.201808356