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    Molecular Orientation Unified Nonfullerene Acceptor Enabling 14% Efficiency As-Cast Organic Solar Cells

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    Type
    Article
    Authors
    Feng, Haohao
    Song, Xin cc
    Zhang, Zhuohan
    Geng, Renyong
    Yu, Jiangsheng
    Yang, Linqiang
    Baran, Derya cc
    Tang, Weihua cc
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-07-19
    Embargo End Date
    2020-07-19
    Permanent link to this record
    http://hdl.handle.net/10754/660097
    
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    Abstract
    Molecular orientation and π–π stacking of nonfullerene acceptors (NFAs) determine its domain size and purity in bulk-heterojunction blends with a polymer donor. Two novel NFAs featuring an indacenobis(dithieno[3,2-b:2ʹ,3ʹ-d]pyrrol) core with meta- or para-alkoxyphenyl sidechains are designed and denoted as m-INPOIC or p-INPOIC, respectively. The impact of the alkoxyl group positioning on molecular orientation and photovoltaic performance of NFAs is revealed through a comparison study with the counterpart (INPIC-4F) bearing para-alkylphenyl sidechains. With inward constriction toward the conjugated backbone, m-INPOIC presents predominant face-on orientation to promote charge transport. The as-cast organic solar cells (OSCs) by blending m-INPOIC and PBDB-T as active layers exhibit a power conversion efficiency (PCE) of 12.1%. By introducing PC71BM as the solid processing-aid, the ternary OSCs are further optimized to deliver an impressive PCE of 14.0%, which is among the highest PCEs for as-cast single-junction OSCs reported in literature to date. More attractively, PBDB-T:m-INPOIC:PC71BM based OSCs exhibit over 11% PCEs even with an active layer thickness over 300 nm. And the devices can retain over 95% of PCE after storage for 20 days. The outstanding tolerance to film thickness and outstanding stability of the as-cast devices make m-INPOIC a promising candidate NFA for large-scale solution-processable OSCs.
    Citation
    Feng, H., Song, X., Zhang, Z., Geng, R., Yu, J., Yang, L., … Tang, W. (2019). Molecular Orientation Unified Nonfullerene Acceptor Enabling 14% Efficiency As-Cast Organic Solar Cells. Advanced Functional Materials, 29(36), 1903269. doi:10.1002/adfm.201903269
    Sponsors
    H.F., X.S., and Z.Z. contributed equally to this work. The authors thank the financial support from the National Natural Science Foundation of China (grant nos. 51573077, 21875111, and 51861145401), Jiangsu Province Natural Science Foundation (BK20180496), the 333 Project to Cultivate High Level Talents in Jiangsu Province, and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
    Publisher
    Wiley
    Journal
    Advanced Functional Materials
    DOI
    10.1002/adfm.201903269
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201903269
    ae974a485f413a2113503eed53cd6c53
    10.1002/adfm.201903269
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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