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

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. Yallum, Julien Réhault, Stefan C. B. Mannsfeld, Dieter Neher, Lee J. Richter, Dean M. DeLongchamp, Frank Ortmann, Koen Vandewal, Erjun Zhou () and Natalie Banerji ()
Additional contact information
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

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-14549-w

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