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Achieving improved stability and minimal non-radiative recombination loss for over 18% binary organic photovoltaics via versatile interfacial regulation strategy

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Abstract

Interfacial regulation, serving multiple roles, is critical for the fabrication of stable and efficient organic photovoltaics (OPVs). Herein, a multifunctional cathode interlayer PDINO (15 nm) is prepared by regulating film thickness, which is inserted between active components and stable silver electrode to align work function, and maintain good interfacial contact and device stability. The thick film can help to reduce interfacial surface defects, keep stable surface morphology, and block the silver diffusion into the active layer. Consequently, the optimal PM6:Y6 device records an impressive power conversion efficiency (PCE) of 17.48% with minimized non-radiative recombination loss of 0.239 V. More importantly, the unencapsulated device maintains 91% of the original PCE after aging for over 60 days at 25 °C and 10% relative humidity in dark conditions. Meanwhile, the PM6:eC9 device achieves a remarkable PCE of 18.22% with the enhancement of open-circuit voltage (Voc). Furthermore, the 1 cm2 device-based PDINO (15 nm)/Ag shows a high PCE of 15.2% while only 12.6% for PDINO (9 nm)/Al, indicating the good compatibility of PDINO (15 nm) interlayer with the R2R coating processes used in large-area OPVs fabrication. This work highlights the promise of interfacial regulation to simultaneously stabilize and enhance the efficiency of organic photovoltaics.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51903189, 51800334).

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Author notes

  1. These authors contributed equally to this work.

Authors and Affiliations

  1. College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, Nanchang, 330031, China

    Lifu Zhang, Houdong Mao, Lei Hu, Xinkang Wang, Licheng Tan & Yiwang Chen

  2. National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, Jiangxi Normal University, Nanchang, 330022, China

    Yiwang Chen

  3. Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China

    Liqiang Huang

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  1. Lifu Zhang
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  2. Houdong Mao
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  4. Lei Hu
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  6. Licheng Tan
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Correspondence to Licheng Tan or Yiwang Chen.

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Supporting information The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Achieving Improved Stability and Minimal Non-Radiative Recombination Loss for over 18% Binary Organic Photovoltaics via Versatile Interfacial Regulation Strategy

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Zhang, L., Mao, H., Huang, L. et al. Achieving improved stability and minimal non-radiative recombination loss for over 18% binary organic photovoltaics via versatile interfacial regulation strategy. Sci. China Chem. 65, 1623–1633 (2022). https://doi.org/10.1007/s11426-022-1300-1

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  • DOI: https://doi.org/10.1007/s11426-022-1300-1

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