Rational molecular and device design enables organic solar cells approaching 20% efficiency

Gang Li; Jiehao Fu; Shirong Lu; Zeyun Xiao

doi:10.1117/12.3027634

30 September 2024 Rational molecular and device design enables organic solar cells approaching 20% efficiency

Gang Li, Jiehao Fu, Shirong Lu, Zeyun Xiao

Author Affiliations +

Proceedings Volume 13123, Organic, Hybrid, and Perovskite Photovoltaics XXV; 131230Z (2024) https://doi.org/10.1117/12.3027634
Event: Organic Photonics + Electronics, 2024, San Diego, California, United States

Abstract

For organic solar cells to be competitive, the light-absorbing molecules should simultaneously satisfy multiple key requirements, including weak-absorption charge transfer state, high dielectric constant, suitable surface energy, proper crystallinity, etc. However, the systematic design rule in molecules to achieve the abovementioned goals is rarely studied. In this work, guided by theoretical calculation, we present a rational design of non-fullerene acceptor o-BTP-eC9, with distinct photoelectric properties compared to benchmark BTP-eC9. o-BTP-eC9 based device has uplifted charge transfer state, therefore significantly reducing the OSC energy loss by 41 meV and showing excellent power conversion efficiency of 18.7%. Moreover, the new guest acceptor o-BTP-eC9 has excellent miscibility, crystallinity, and energy level compatibility with BTP-eC9, which enables an efficiency of 19.9% (19.5% certified) in PM6:BTP-C9:o-BTP-eC9 based ternary system with enhanced operational stability. Ref. Nature Communications (2024) In press

Conference Presentation

Citation Download Citation

Gang Li, Jiehao Fu, Shirong Lu, and Zeyun Xiao "Rational molecular and device design enables organic solar cells approaching 20% efficiency", Proc. SPIE 13123, Organic, Hybrid, and Perovskite Photovoltaics XXV, 131230Z (30 September 2024); https://doi.org/10.1117/12.3027634

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