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    Organic thin-film transistors with flame-annealed contacts

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    Name:
    _Waldrip+et+al_2020_Flex._Print._Electron._10.1088_2058-8585_ab76e1.pdf
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    Description:
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    Type
    Article
    Authors
    Waldrip, Matthew cc
    Haneef, Hamna
    Wadsworth, Andrew
    McCulloch, Iain cc
    Jurchescu, Oana D. cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Date
    2020-03-05
    Permanent link to this record
    http://hdl.handle.net/10754/661645
    
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    Abstract
    Reducing contact resistance is critical to developing high-performance organic field-effect transistors (OFETs) since it impacts both the device mobility and switching speed. Charge injection and collection has been optimized by applying chemical treatments to the contacts, such as self-assembled monolayers, oxide interlayers, or dopants. Here, we tested how flame annealing the surface of the electrodes impacts the interface and bulk components of the contact resistance, as well as the overall device performance. A butane micro torch was used to flash-anneal the gold electrodes, which allowed gold grains to crystallize into larger domains. We found that, along with the grain size, the surface roughness of the contacts was also increased. Self-assembled monolayer treatment created a lower work function shift on a flame annealed electrode than when deposited on an untreated surface, due to the greater surface roughness. This resulted in a larger interface contact resistance. However, flame annealing also produced an order of magnitude reduction in the density of trap states in the semiconductor layer, which reduced the bulk contact resistance and channel resistance. These competing effects yielded OFETs with similar performance as untreated devices
    Citation
    Waldrip, M., Haneef, H., Wadsworth, A., McCulloch, I., & Jurchescu, O. D. (2020). Organic thin-film transistors with flame-annealed contacts. Flexible and Printed Electronics. doi:10.1088/2058-8585/ab76e1
    Sponsors
    This work was supported by the National Science Foundation under grants 1810273 and 1627925.
    Publisher
    IOP Publishing
    Journal
    Flexible and Printed Electronics
    DOI
    10.1088/2058-8585/ab76e1
    Additional Links
    https://iopscience.iop.org/article/10.1088/2058-8585/ab76e1
    ae974a485f413a2113503eed53cd6c53
    10.1088/2058-8585/ab76e1
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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