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Direct-Printed Organic Thin-Film Transistor Using PDMS Stamp and Low Viscosity Nanosilver Ink

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The contact electrodes of printed organic thin-film transistors (OTFTs) were fabricated by direct printing using patterned hard poly(dimethylsiloxane) (h-PDMS) stamp with injection channel onto flexible poly(ethylenenaphthalate) (PEN) plastic substrates, wherein low-viscosity and low-resistance conductive nanoparticle silver (Ag) ink was injected. The source and drain electrodes (W/L = 500 m/5 m, 500 m/10 m, and 500 m/20 m) of printed OTFT were fabricated by direct printing. The printed OTFT with polyvinylphenol (PVP) as polymer dielectric layer was formed by spin coating and poly(3-hexylthiopene-2,5-dily) (P3HT) as organic semiconductor layer was ink-jet printing. The printed OTFT was characterized in air and the following parameters were obtained: a mobility of 0.06 (±0.02) cm2/Vs, an on/off current ratio of 104 and a subthreshold slope of 2.53 V/decade. The direct printing using patterned h-PDMS stamp for ink injection patterning made it be possible to fabricate printed OTFT with a channel length as below as to 5 m. The number of steps in the fabrication process was reduced by 20 steps compared with photolithography.


Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.1122

Publication date: October 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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