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Sub-picosecond charge-transfer at near-zero driving force in polymer:non-fullerene acceptor blends and bilayers

Author

Listed:
  • Yufei Zhong

    (University of Bern)

  • Martina Causa’

    (University of Bern)

  • Gareth John Moore

    (University of Bern)

  • Philipp Krauspe

    (University of Bern)

  • Bo Xiao

    (National Center for Nanoscience and Technology)

  • Florian Günther

    (Universidade de São Paulo (USP))

  • Jonas Kublitski

    (Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics Technische Universität Dresden)

  • Rishi Shivhare

    (Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics Technische Universität Dresden)

  • Johannes Benduhn

    (Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics Technische Universität Dresden)

  • Eyal BarOr

    (University of Potsdam)

  • Subhrangsu Mukherjee

    (National Institute of Standards and Technology (NIST))

  • Kaila M. Yallum

    (University of Bern)

  • Julien Réhault

    (University of Bern)

  • Stefan C. B. Mannsfeld

    (Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics Technische Universität Dresden)

  • Dieter Neher

    (University of Potsdam)

  • Lee J. Richter

    (National Institute of Standards and Technology (NIST))

  • Dean M. DeLongchamp

    (National Institute of Standards and Technology (NIST))

  • Frank Ortmann

    (Technische Universität Dresden)

  • Koen Vandewal

    (Hasselt University)

  • Erjun Zhou

    (National Center for Nanoscience and Technology)

  • Natalie Banerji

    (University of Bern)

Abstract

Organic photovoltaics based on non-fullerene acceptors (NFAs) show record efficiency of 16 to 17% and increased photovoltage owing to the low driving force for interfacial charge-transfer. However, the low driving force potentially slows down charge generation, leading to a tradeoff between voltage and current. Here, we disentangle the intrinsic charge-transfer rates from morphology-dependent exciton diffusion for a series of polymer:NFA systems. Moreover, we establish the influence of the interfacial energetics on the electron and hole transfer rates separately. We demonstrate that charge-transfer timescales remain at a few hundred femtoseconds even at near-zero driving force, which is consistent with the rates predicted by Marcus theory in the normal region, at moderate electronic coupling and at low re-organization energy. Thus, in the design of highly efficient devices, the energy offset at the donor:acceptor interface can be minimized without jeopardizing the charge-transfer rate and without concerns about a current-voltage tradeoff.

Suggested Citation

  • Yufei Zhong & Martina Causa’ & Gareth John Moore & Philipp Krauspe & Bo Xiao & Florian Günther & Jonas Kublitski & Rishi Shivhare & Johannes Benduhn & Eyal BarOr & Subhrangsu Mukherjee & Kaila M. Yall, 2020. "Sub-picosecond charge-transfer at near-zero driving force in polymer:non-fullerene acceptor blends and bilayers," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14549-w
    DOI: 10.1038/s41467-020-14549-w
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    Cited by:

    1. Kai Müller & Karl S. Schellhammer & Nico Gräßler & Bipasha Debnath & Fupin Liu & Yulia Krupskaya & Karl Leo & Martin Knupfer & Frank Ortmann, 2023. "Directed exciton transport highways in organic semiconductors," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Hongbo Wu & Hao Lu & Yungui Li & Xin Zhou & Guanqing Zhou & Hailin Pan & Hanyu Wu & Xunda Feng & Feng Liu & Koen Vandewal & Wolfgang Tress & Zaifei Ma & Zhishan Bo & Zheng Tang, 2024. "Decreasing exciton dissociation rates for reduced voltage losses in organic solar cells," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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