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    Quantitative relations between interaction parameter, miscibility and function in organic solar cells

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    Type
    Article
    Authors
    Ye, Long cc
    Hu, Huawei
    Ghasemi, Masoud
    Wang, Tonghui cc
    Collins, Brian A
    Kim, Joo-Hyun
    Jiang, Kui
    Carpenter, Joshua H.
    Li, Hong cc
    Li, Zhengke
    McAfee, Terry
    Zhao, Jingbo cc
    Chen, Xiankai cc
    Lai, Joshua Lin Yuk cc
    Ma, Tingxuan
    Bredas, Jean-Luc cc
    Yan, He
    Ade, Harald
    KAUST Department
    KAUST Solar Center (KSC)
    Laboratory for Computational and Theoretical Chemistry of Advanced Materials
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-02-05
    Online Publication Date
    2018-02-05
    Print Publication Date
    2018-03
    Permanent link to this record
    http://hdl.handle.net/10754/627276
    
    Metadata
    Show full item record
    Abstract
    Although it is known that molecular interactions govern morphology formation and purity of mixed domains of conjugated polymer donors and small-molecule acceptors, and thus largely control the achievable performance of organic solar cells, quantifying interaction-function relations has remained elusive. Here, we first determine the temperature-dependent effective amorphous-amorphous interaction parameter, χaa(T), by mapping out the phase diagram of a model amorphous polymer:fullerene material system. We then establish a quantitative 'constant-kink-saturation' relation between χaa and the fill factor in organic solar cells that is verified in detail in a model system and delineated across numerous high- and low-performing materials systems, including fullerene and non-fullerene acceptors. Our experimental and computational data reveal that a high fill factor is obtained only when χaa is large enough to lead to strong phase separation. Our work outlines a basis for using various miscibility tests and future simulation methods that will significantly reduce or eliminate trial-and-error approaches to material synthesis and device fabrication of functional semiconducting blends and organic blends in general.
    Citation
    Ye L, Hu H, Ghasemi M, Wang T, Collins BA, et al. (2018) Quantitative relations between interaction parameter, miscibility and function in organic solar cells. Nature Materials 17: 253–260. Available: http://dx.doi.org/10.1038/s41563-017-0005-1.
    Sponsors
    Work by NCSU was initiated with support from the US Department of Energy, Office of Science, Basic Energy Science, Division of Materials Science and Engineering under contract DE-FG02-98ER45737, and completed with support from ONR grants N00141512322 and N000141712204. X-ray data were acquired at beamlines 11.0.1.2, 7.3.3 and 5.3.2.2 at the Advanced Light Source, which is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under contract DE-AC02-05CH11231. The DSC instrument, and DSC and SIMS analysis by NCSU, were supported by a UNC General Administration Research Opportunity Initiative grant. SIMS was performed at the Analytical Instrumentation Facility (AIF) at NCSU, which is partially supported by the State of North Carolina and the National Science Foundation (award number ECCS-1542015). The AIF is a member of the North Carolina Research Triangle Nanotechnology Network (RTNN), a site in the National Nanotechnology Coordinated Infrastructure (NNCI). The work was partially supported by the National Basic Research Program of China (973 Program; 2013CB834705), HK JEBN Limited (Hong Kong), the Hong Kong Research Grants Council (T23-407/13-N, N_HKUST623/13 and 606012), HKUST President’s Office through the SSTSP scheme (project reference number: EP201) and the National Natural Science Foundation of China (NSFC, 21374090, 21504066, 21534003 and 51320105014). The work at KAUST was supported by generous KAUST internal funding. The work at Georgia Tech was funded by ONR grant N00014-17-1-2208. A.L.D. Kilcoyne, E. Schaible, C. Zhu, A. Hexemer, C. Wang and A. Young of the ALS (DOE) assisted with the measurements and provided instrument maintenance. S. Mukherjee and O. Awartani are acknowledged for assisting with part of the X-ray data acquisition and normalization, and C. McNeill is acknowledged for initial work on the STXM miscibility measurement of PCDTBT. The KAUST IT Research Computing Team and the KAUST Supercomputing Laboratory are acknowledged for providing computational resources. The authors acknowledge and appreciate the fruitful discussions with N. Stingelin, J. Michels, E. Gomez, and M. Balik, and thank A. Dinku for maintaining the shared device fabrication facilities at NCSU, and E. Gomez for sharing his FH code.
    Publisher
    Springer Nature
    Journal
    Nature Materials
    DOI
    10.1038/s41563-017-0005-1
    PubMed ID
    29403053
    Additional Links
    https://www.nature.com/articles/s41563-017-0005-1
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41563-017-0005-1
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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