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All-solution-processed bottom-gate organic thin-film transistor with improved subthreshold behavior using functionalized pentacene active layer

Cited 46 time in Web of Science Cited 55 time in Scopus
Authors
Kim, Jinwoo; Jeong, Jaewook; Cho, Hyun Duk; Lee, Changhee; Kim, Seul Ong; Kwon, Soon-Ki; Hong, Yongtaek
Issue Date
2009-06-07
Publisher
IOP Science
Citation
J. Phys. D: Appl. Phys. 42 115107
Abstract
We report organic thin-film transistors (OTFTs) made by simple solution processes in an
ambient air environment. Inkjet-printed silver electrodes were used for bottom-gate and
bottom-contacted source/drain electrodes. A spin-coated cross-linked poly(4-vinylphenol)
(PVP) and a spin-coated 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) were
used as a gate dielectric layer and an active layer, respectively. A high-boiling-point solvent
was used for TIPS-pentacene and the resulting film showed stem-like morphology. X-ray
diffraction (XRD) measurement showed the spin-coated active layer was well crystallized,
showing the (0 0 1) plane. The reasonable mobility, on/off ratio and threshold voltage of the
fabricated device, which are comparable to those of the previously reported TIPS-pentacene
OTFT with gold electrodes, show that the printed silver electrodes worked successfully as gate
and source/drain electrodes. Furthermore, the device showed a subthreshold slope of
0.61 V/dec in the linear region (VDS = −5 V), which is the lowest value for spin-coated
TIPS-pentacene TFT ever reported, and much lower than that of the thermally evaporated
pentacene OTFTs. It is thought that the surface energy of the PVP dielectric layer is well
matched with that of a well-ordered TIPS-pentacene (0 0 1) surface when a high-boiling-point
solvent and a low-temperature drying process are used, thereby making good interface
properties, and showing higher performances than those for pentacene TFT with the same
structure.
ISSN
0022-3727
Language
English
URI
http://hdl.handle.net/10371/13602
DOI
https://doi.org/10.1088/0022-3727/42/11/115107
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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