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    Crystallization Control of Organic Semiconductors during Meniscus-Guided Coating by Blending with Polymer Binder

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    Type
    Article
    Authors
    Zhang, Ke
    Marszalek, Tomasz
    Wucher, Philipp
    Wang, Zuyuan
    Veith, Lothar
    Lu, Hao
    Räder, Hans-Joachim
    Beaujuge, Pierre
    Blom, Paul W. M.
    Pisula, Wojciech
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    CRG_R2_13_BEAU_KAUST_1
    Date
    2018-10-16
    Online Publication Date
    2018-10-16
    Print Publication Date
    2018-12
    Permanent link to this record
    http://hdl.handle.net/10754/630640
    
    Metadata
    Show full item record
    Abstract
    Small molecule organic semiconductors (OSCs) suffer from their uncontrolled nucleation and growth during solution processing limiting their functionality in electronic devices. In this work, a new method is presented based on dip-coating a blend consisting of OSC and insulating polymer to control the crystallization of the active film for organic field-effect transistors. A small fraction of amorphous poly(methyl methacrylate) (PMMA) efficiently improves the crystallization of dip-coated small molecule OSCs, α,ω-dihexylquaterthiophene (DH4T) and diketopyrrolopyrrole-sexithiophene (DPP6T). The maximum charge carrier mobilities of dip-coated OSC:PMMA films are significantly higher than drop-cast blend ones and comparable with OSC single crystals. The high charge carrier mobility originates from a continuous alignment of the crystalline films and stratified OSC and PMMA layers. The improved crystallization is attributed to two mechanisms: first, the polymer binder leads to a viscosity gradient at the meniscus during dip-coating, facilitating the draw of solute and thus mass transport. Second, the polymer binder solidifies at the bottom layer, reducing the nucleation barrier height of small molecule OSC. The findings demonstrate that a small fraction of a polymer binder during dip-coating efficiently improves the crystallization as well as the electronic properties of small molecule OSC films.
    Citation
    Zhang K, Marszalek T, Wucher P, Wang Z, Veith L, et al. (2018) Crystallization Control of Organic Semiconductors during Meniscus-Guided Coating by Blending with Polymer Binder. Advanced Functional Materials 28: 1805594. Available: http://dx.doi.org/10.1002/adfm.201805594.
    Sponsors
    The authors declare no competing financial interest. K.Z. thanks the China Scholarship Council (CSC) for financial support. T.M. acknowledges the Foundation for Polish Science cofinanced by the European Union under the European Regional Development Fund (First TEAM/2017–3/26). W.P. acknowledges the National Science Centre, Poland, through the grant UMO-2015/18/E/ST3/00322. P.M.B. acknowledges concurrent support from the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. CRG_R2_13_BEAU_KAUST_1 and under Baseline Research Funding. P.W. thanks the KAUST analytical core lab (ACL) for technical support in the mass spectrometry analyses. Z.W. acknowledges the support by European Research Council (ERC) (SmartPhon No. 694977).
    Publisher
    Wiley
    Journal
    Advanced Functional Materials
    DOI
    10.1002/adfm.201805594
    Additional Links
    https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201805594
    ae974a485f413a2113503eed53cd6c53
    10.1002/adfm.201805594
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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