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    A novel strategy to improve the operational and outdoor stability of non-fullerene acceptor-based organic solar cells

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    Type
    Presentation
    Authors
    Yazmaciyan, Aren
    Xu, Han
    Paleti, Sri Harish Kumar
    Babics, Maxime cc
    De Wolf, Stefaan cc
    Baran, Derya cc
    KAUST Department
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Material Science and Engineering
    Material Science and Engineering Program
    Date
    2022-07-11
    Permanent link to this record
    http://hdl.handle.net/10754/685461
    
    Metadata
    Show full item record
    Abstract
    Humankind is living in a climate emergency that requires immediate action. However, in the meantime, the world’s energy demand is continuously increasing; thus, making clean energy generation of paramount importance. Photovoltaics is at the forefront of this clean energy movement with organic photovoltaics emerging as a promising candidate to address this issue and meet this demand. Having said that, organic semiconductors came a long way from fullerene-based solar cells to state-of-the-art non-fullerene acceptor-based (NFAs) cells that show promise as next-generation photovoltaic devices. Organic solar cells employing such materials have already surpassed 20% in power conversion efficiencies (PCEs) after less than a decade of research, excluding initial attempts to outclass their fullerene counterparts in the 90s.[1] Much is done to realize high PCEs by the research community; nonetheless, the urgency to unravel the underlying mechanisms crippling the stability of the photovoltaic devices based on such material systems picked up only in recent years. Even so, a thorough understanding or a guideline is still lacking to tackle this limitation once and for all. In this work, we implement a novel strategy, which we refer to as donor dilution, to improve the operational and outdoor stability of NFA-based systems in an archetypal donor:acceptor blend, namely, PTB7-Th:IEICO-4F.[2,3] Organic solar cells exploiting this material system with decreasing polymer content in the polymer:small molecule blend progressively perform superior both in operational and outdoor stability tests. Unencapsulated donor-diluted devices retain 85% of their initial PCE under continuous 1 sun equivalent metal halide lamp illumination at 40⁰C after 1000 hours. Furthermore, the in-house developed encapsulation procedure enables these devices to endure the harsh outdoor conditions (~23⁰C and ~64% relative humidity on average throughout winter) for an extended period in the Kingdom of Saudi Arabia. These findings underpin the universal effort to improve the organic photovoltaic device stability, provide a practical strategy as a proof-of-concept to enhance the lifetime of organic photovoltaic devices, and bring this technology a step closer to commercialization. Future work consists of further examination of the universality of the donor dilution approach and is underway by testing various donor:acceptor blends with different classes of non-fullerene acceptors, such as state-of-the-art Y-series molecules.
    Citation
    Yazmaciyan, A., Xu, H., Paleti, S. H. K., Babics, M., De Wolf, S., & Baran, D. (2022). A novel strategy to improve the operational and outdoor stability of non-fullerene acceptor-based organic solar cells. Proceedings of the Materials for Sustainable Development Conference (MAT-SUS). https://doi.org/10.29363/nanoge.nfm.2022.113
    Publisher
    FUNDACIO DE LA COMUNITAT VALENCIANA SCITO
    Conference/Event name
    Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
    DOI
    10.29363/nanoge.nfm.2022.113
    Additional Links
    https://www.nanoge.org/proceedings/NFM22/62b0c893cee4c129dd94129e
    ae974a485f413a2113503eed53cd6c53
    10.29363/nanoge.nfm.2022.113
    Scopus Count
    Collections
    Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; Presentations; KAUST Solar Center (KSC)

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