Highly Efficient Ternary Solar Cells with Efficient Förster Resonance Energy Transfer for Simultaneously Enhanced Photovoltaic Parameters |
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| Authors: | Liangang Xiao Xing Wu Guoxing Ren Matthew A Kolaczkowski Guang Huang Wanyi Tan Lin Ma Yidong Liu Xiaobin Peng Yonggang Min Yi Liu |
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| Affiliation: | 1. School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006 China;2. The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA;3. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006 China;4. State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou, 510640 China |
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| Abstract: | Introducing a third component into organic bulk heterojunction solar cells has become an effective strategy to improve photovoltaic performance. Meanwhile, the rapid development of non-fullerene acceptors (NFAs) has pushed the power conversion efficiency (PCE) of organic solar cells (OSCs) to a higher standard. Herein, a series of fullerene-free ternary solar cells are fabricated based on a wide bandgap acceptor, IDTT-M, together with a wide bandgap donor polymer PM6 and a narrow bandgap NFA Y6. Insights from the morphological and electronic characterizations reveal that IDTT-M has been incorporated into Y6 domains without disrupting its molecular packing and sacrificing its electron mobility and work synergistically with Y6 to regulate the packing pattern of PM6, leading to enhanced hole mobility and suppressed recombination. IDTT-M further functions as an energy-level mediator that increases open-circuit voltage (VOC) in ternary devices. In addition, efficient Förster resonance energy transfer (FRET) between IDTT-M and Y6 provides a non-radiative pathway for facilitating exciton dissociation and charge collection. As a result, the optimized ternary device features a significantly improved PCE up to 16.63% with simultaneously enhanced short-circuit current (JSC), VOC, and fill factor (FF). |
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| Keywords: | energy transfer high open-circuit voltage molecular mixture non-fullerene acceptors ternary solar cells |
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