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    Decohesion Kinetics of PEDOT:PSS Conducting Polymer Films

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    Type
    Article
    Authors
    Dupont, Stephanie R.
    Novoa, Fernando
    Voroshazi, Eszter
    Dauskardt, Reinhold H.
    KAUST Grant Number
    KUS-C1-015-21
    Date
    2013-10-17
    Online Publication Date
    2013-10-17
    Print Publication Date
    2014-03
    Permanent link to this record
    http://hdl.handle.net/10754/597921
    
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    Abstract
    The highly conductive polymer PEDOT:PSS is a widely used hole transport layer and transparent electrode in organic electronic devices. To date, the mechanical and fracture properties of this conductive polymer layer are not well understood. Notably, the decohesion rate of the PEDOT:PSS layer and its sensitivity to moist environments has not been reported, which is central in determining the lifetimes of organic electronic devices. Here, it is demonstrated that the decohesion rate is highly sensitive to the ambient moisture content, temperature, and mechanical stress. The kinetic mechanisms are elucidated using atomistic bond rupture models and the decohesion process is shown to be facilitated by a chemical reaction between water molecules from the environment and strained hydrogen bonds. Hydrogen bonds are the predominant bonding mechanism between individual PEDOT:PSS grains within the layer and cause a significant loss in cohesion when they are broken. Understanding the decohesion kinetics and mechanisms in these films is essential for the mechanical integrity of devices containing PEDOT:PSS layers and yields general guidelines for the design of more reliable organic electronic devices. Decohesion rate in PEDOT:PSS conducting films is studied under varied environmental conditions. The moisture content in the environment is the most important factor accelerating the decohesion in the PEDOT:PSS layer, which is detrimental for device reliability. The findings on the decohesion rate and mechanisms, elucidated by atomic kinetic models, are essential for the design of more reliable organic electronic devices containting PEDOT:PSS layers. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Citation
    Dupont SR, Novoa F, Voroshazi E, Dauskardt RH (2013) Decohesion Kinetics of PEDOT:PSS Conducting Polymer Films. Advanced Functional Materials 24: 1325–1332. Available: http://dx.doi.org/10.1002/adfm.201302174.
    Sponsors
    This research was supported by the Center for Advanced Molecular Photovoltaics (CAMP) supported by King Abdullah University of Science and Technology (KAUST) under award no. KUS-C1-015-21.
    Publisher
    Wiley
    Journal
    Advanced Functional Materials
    DOI
    10.1002/adfm.201302174
    ae974a485f413a2113503eed53cd6c53
    10.1002/adfm.201302174
    Scopus Count
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    Publications Acknowledging KAUST Support

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