In this paper, we report contact properties of fully inkjet-printed organic thin-film transistors (OTFTs) with various channel lengths and their improvement by introducing an organo-compatible interlayer between the organic channel and inkjet-printed metallic contacts. To realize all-inkjet-printed
OTFTs, a highly conductive metal-organic precursor type silver ink, poly(4-vinylphenol), chlorosilane-terminated polystyrene (PS) and 6, 13-bis(triisopropylsilylethynyl)pentacene (TIPS pentacene) solutions were printed by using a commercial piezoelectric inkjet-printer for gate and source/drain
(S/D) electrodes, a gate dielectric layer, an interface engineering layer, and a semiconductor layer, respectively. Especially, since the contact resistance more dominantly affects a carrier injection property as channel length gets short, a short-channel length of 7 μm was formed
by using 1 picoliter volume ink cartridge to investigate effects of the organo-compatible interlayer obviously. To evaluate contact properties of the inkjet-printed short-channel OTFTs, transmission line method and Y-function method analyses were used for various channel lengths and
low drain-to-source voltage (V
DS) regime of -5 V, respectively. The contact properties between inkjet-printed silver S/D electrodes and TIPS pentacene semiconductor were drastically enhanced showing contact resistance lowered by an order of magnitude and a good linearity
at low V
DS regime after inserting an end-functionalized PS layer.
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Organic Thin-Film Transistors
Document Type: Research Article
Department of Electrical and Computer Engineering and Inter-University Semiconductor Research Center (ISRC), Seoul National University, Seoul 08826, Republic of Korea
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
Publication date: August 1, 2017
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