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Title: | Understanding and Suppressing Non-Radiative Recombination Losses in Non-Fullerene Organic Solar Cells | Authors: | LIU, Quan VANDEWAL, Koen |
Issue Date: | 2023 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | ADVANCED MATERIALS, 35 (35) , p. 2302452 | Abstract: | Organic solar cells benefit from non-fullerene acceptors (NFA) due to their high absorption coefficients, tunable frontier energy levels, and optical gaps, as well as their relatively high luminescence quantum efficiencies as compared to fullerenes. Those merits result in high yields of charge generation at a low or negligible energetic offset at the donor/NFA heterojunction, with efficiencies over 19% achieved for single-junction devices. Pushing this value significantly over 20% requires an increase in open-circuit voltage, which is currently still well below the thermodynamic limit. This can only be achieved by reducing non-radiative recombination, and hereby increasing the electroluminescence quantum efficiency of the photo-active layer. Here, current understanding of the origin of non-radiative decay, as well as an accurate quantification of the associated voltage losses are summarized. Promising strategies for suppressing these losses are highlighted, with focus on new material design, optimization of donor-acceptor combination, and blend morphology. This review aims at guiding researchers in their quest to find future solar harvesting donor-acceptor blends, which combine a high yield of exciton dissociation with a high yield of radiative free carrier recombination and low voltage losses, hereby closing the efficiency gap with inorganic and perovskite photovoltaics. | Notes: | Liu, Q; Vandewal, K (corresponding author), Hasselt Univ, IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.; Liu, Q (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Prov Engn Res Ctr Energy Optoelect Mat &, Ningbo 315201, Peoples R China. liuquan@nimte.ac.cn; koen.vandewal@uhasselt.be |
Keywords: | charge-transfer state;electroluminescence quantum efficiency;non-radiative recombination;open-circuit voltage loss;organic photovoltaic | Document URI: | http://hdl.handle.net/1942/40773 | ISSN: | 0935-9648 | e-ISSN: | 1521-4095 | DOI: | 10.1002/adma.202302452 | ISI #: | 001040100500001 | Rights: | 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH. 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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Advanced Materials - 2023 - Liu.pdf | Published version | 2.29 MB | Adobe PDF | View/Open |
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