Inkjet printed thin and uniform dielectrics for capacitors and organic thin film transistors enabled by the coffee ring effect

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DOIResolve DOI: http://doi.org/10.1016/j.orgel.2015.11.039
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TypeArticle
Journal titleOrganic Electronics: physics, materials, applications
ISSN1566-1199
Volume29
Pages114119; # of pages: 6
SubjectCapacitance; Capacitors; Deposition; Dielectric materials; Drain current; Thin films; Inkjet; Organic thin film transistors; Polymer dielectrics; Printed electronics; Source-drain current; Standard deviation; TFT; Thin-film transistor (TFTs)
AbstractThe deposition of a thin and uniform dielectric layer is required for high performance printed capacitors and thin film transistors (TFTs), however this is difficult to achieve with printing methods. We have demonstrated inkjet-printed dielectrics with a uniform thickness from 70 nm to 200 nm by taking advantage of the coffee ring effect. A high capacitance per unit area of 230 pF/mm2 is achieved from capacitors with linear morphologies fully printed onto flexible substrates. We also demonstrate organic TFTs with an average mobility of 0.86 cm2/Vs and a source drain current of 57 μA obtained with a supply voltage of 15 V. This performance was shown to be consistent, with a standard deviation of 15% obtained from hundreds of printed organic TFTs on PET substrates. This consistency was further validated by the production of functional NAND, NOR, AND and OR logic gates. Our results demonstrate that the coffee ring effect, which is usually viewed as undesirable, can enable higher performance in printed electronic devices.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationInformation and Communication Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21277466
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Record identifier113ead40-7701-463d-b18e-23294c667357
Record created2016-03-09
Record modified2016-05-09
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